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Subject: Environment

  • What is International Argo Program?

    argo

    The International Argo Program system to observe carbon concentration in the world’s oceans is extremely inadequate to meet the growing and urgent need for information on oceanic carbon, says a report.

    What is Argo?

    • Argo is an international program that uses profiling floats to observe temperature, salinity, currents, and, recently, bio-optical properties in the Earth’s oceans; it has been operational since the early 2000s.
    • The real-time data it provides is used in climate and oceanographic research.
    • A special research interest is to quantify the ocean heat content (OHC).
    • Each instrument (float) spends almost all its life below the surface.
    • The name Argo was chosen because the array of floats works in partnership with the Jason earth observing satellites that measure the shape of the ocean surface.
    • In Greek mythology Jason sailed on his ship the Argo in search of the Golden Fleece.

    What are its aims?

    • The data that Argo collects describes the temperature and salinity of the water and some of the floats measure other properties that describe the biology/chemistry of the ocean.
    • The main reason for collecting these data is to help us understand the oceans’ role in earth’s climate.
    • For example, the changes in sea level (once the tides are averaged out) depend partly on the melting of icecaps and partly on the amount of heat stored in the oceans.
    • Argo’s temperature measurements allow us to calculate how much heat is stored and to monitor from year to year how the distribution of heat changes with depth and from area to area.
    • As ocean heat content increases, sea level rises, just like the mercury in a thermometer.

    How does it work?

    • Each Argo float (costing between $20,000 and $150,000 depending on the individual float’s technical specification) is launched from a ship.
    • The float’s weight is carefully adjusted so that, as it sinks, it eventually stabilizes at a pre-set level, usually 1 km.
    • Ten days later, an internal battery-driven pump transfers oil between a reservoir inside the float and an external bladder.
    • This makes the float first descend to 2km and then return to the surface measuring ocean properties as it rises.
    • The data and the float position are relayed to satellites and then on to receiving stations on shore.
    • The float then sinks again to repeat the 10 day cycle until its batteries are exhausted.

     

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  • Fly ash generation and Disposal

    fly ashContext

    • India depends heavily on coal for power generation. This creates the problem of fly-ash generation and its proper disposal, usage.
    • The National Green Tribunal (NGT) noted September 19, 2022 that there was an urgent need to augment the utilisation and disposal of fly ash in Chhattisgarh.

    What is fly ash?

    • Fly ash is a by-product of coal combustion. It contains Aluminium Silicate, SiO2, CaO, oxides of iron, magnesium and toxic metals like lead, arsenic, cobalt, and copper.
    • It can travel to far places. India is growing to double its power generation in the next decade and with coal being the biggest source of fuel for power generation, the problem of fly ash is going to increase too.

    fly ash Environmental Problems with fly ash

    • A large quantity of fly ash dumped into poorly designed and maintained ash ponds. About a billion tonnes of this toxic ash lie dumped in these ponds, polluting land, air, and water.
    • All the heavy metals found in fly ash—nickel, cadmium, arsenic, chromium, lead, etc—are toxic in nature. They leech into the surrounding soil and can enter food-chains.
    • Fly ash gets easily ingested through respiration, which causes many diseases such as asthma, neurological disorders.
    • Suspended fly ash in the air acts as a global warming agent and heats the earth’s surface.
    • Fly ash settles on leaves and crops and reduces crop productivity.
    • It pollutes the groundwater.
    • There is a reduction in recharging of groundwater due to fly ash filled mine voids.
    • Reduces visibility by creating dense fog in the winter season.

    fly ashIssues with fly ash management

    • The government mandates that all coal power plants (CPPs) reach 100% utilization of fly ash.
    • Along with it, CPPs should give a certain amount of fly ash free of cost for MSMEs to manufacture bricks, tiles and rest of the fly ash should be sold to other industries.
    • CPPs will have to maintain fly ash ponds to reduce its suspension in air.
    • But all these steps for utilization areas are problematic as they do little to mitigate these risks.
    • The pricing of fly ash is increasingly becoming a contentious issue that is hampering its gainful utilization.
    • The current approaches to evaluating risks with fly ash disposal are very limited, and they may underestimate the true risks
    • In spite of initiatives taken by the government, several nongovernmental and research and development organizations for fly ash utilization, the level of fly ash utilization in the country is quite low at only 38% which is less than the global standards.
    • Hence, rather than being utilized, fly ash is being stored despite warnings from regulators.
    • Deposition in storage places has negative influences on water and soil because of their mineral composition as well as morphology and filtration properties.
    • Ash-handling units are the biggest consumers of water in CPPs. The government advocates the designed ash-to-water ratios as approximately 1:5 for fly ash, but the observed ratios have been around 1:20.
    • Certain states have discouraged the use of blended cement and fly ash bricks in public works.

    fly ashThe above issues can be addressed by

    • Greater regulatory oversight and price control,
    • Revision of cement blending standards,
    • Research in improving fly ash quality,
    • Reducing the cost of transportation,
    • Provisions for overcoming information asymmetries,
    • Incentivising use in brick kilns for producing fly ash bricks,
    • Overall sensitization of key decision-makers on the matter.
    • Instead of dumping it on ash ponds, can be used for construction due to its reuse as pozzolan, and replacement of portland cement by hydraulic cement
    • Due to its grain size distribution, enhanced strength permeability, it can be used to construct embankments at road construction, concrete dams like GHATGHAR DAM
    • Strong penalties for those production units who do not use proper filtration devices
    • Moving to renewable energy production away from coal-based thermal production.

    Conclusion

    • Utilization of Fly Ash is not only possible but also essential. In this context “Fly Ash Mission of Government of India” is a slow but steady start, the pace of which needs to be ramped up. An honest effort is required by the concerned stakeholders to improve the perceptions of fly ash-based cement or concrete; increase its use, particularly for government works; and impart scientific knowledge about fly ash, its uses, and possible impacts.

    Mains question

    Q. What is fly ash? Discuss the environmental challenges it poses. Suggest how to address the situation.

     

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  • The heavy rainfall and the crazy Banglore flood: A case to study

    floodContext

    • The recent events of heavy downpours in short period of time and the recent example of Banglore flood, highlights how cities in India and elsewhere need to adapt to climate change as it brings more extreme rainfall in the future.

    What is heavy downpour?

    • A downpour or cloudburst is a sudden and unexpected heavy fall of rain.
    • It is usually local in nature and of brief duration. Most so-called cloudbursts occur in connection with thunderstorms.
    • Heavy downpour in short period causes flood, damage to buildings and infrastructure can disrupt transport, communications and connectivity, loss of crops and livestock.

    The heavy rainfall and the Banglore flood causes

    • Rise in built up area: Lakes and natural depressions may not always fill up during many monsoons so the people who are unaware of hydrology tempts to build and buy in the catchment areas of water-bodies, which will be disastrous when it rains heavily as there is rise in the quantity.
    • Water-logging: rainwater and sewage water are forced to build up, which results in water-logging. The highway acts as a dam for the water ,Garbage frequently clogs drains, which limits the flow of sewage, and they are too small to support the weight of the expanding population.
    • Physical shrinkage of water-bodies: Destruction of lakes is a major issue .lakes can store the excess water and regulate the flow of water however the pollution of natural water bodies and converting them for development purposes has increased the risks of floods. Unplanned growth, Rise in population, rise in the built up areas along streams, canals, around the lakes, leaving no storage capacity.
    • Compromised runoff potential and health hazards: Choked and encroached drains and lakes, ill designed infrastructure and missing pipes compromising run off potential. Not only the physical quantity of the runoff that poses a hazard. When polluted drains and lakes overflow, the flood can pose a health hazard especially to vulnerable and exposed marginal communities living in informal settlements.
    • Zero or limited ability to allow infiltration of water: Encroachments in and around wetlands and green lands harming the natural way of water infiltration and ground water recharge.
    • Lack of vision in rain water harvesting: Ignorance towards the tradition rain water harvesting techniques and no or limited vision for creating new systems of rain water harvesting. Exceptionally heavy monsoon rains have been exacerbated by poor urban planning in the Indian tech hub, showing the need for improved water systems.

    floodWhat are the reasons behind the frequent floods in urban areas?

    • Meteorological factors: change in the weather patterns, increase in the temperature leading to heavy rainfall, sudden downpour, cloudburst, thunderstorms, hailstorms etc.
    • Hydrological factors: Natural surface infiltration rate, soil moisture level, presence or absence of Overbank flows, Presence of impervious cover, the occurrence of high tides impeding the drainage in coastal cities.
    • Man-Made factors:
      • Unplanned urbanization: Unplanned settlement is one of the main cause of urban flooding. Blocking of natural drainage pathways through construction activity and encroachment on catchment areas, streams, rivers, lakebeds. Reduced infiltration and ground water recharge of water, destruction of lakes, Land-use changes (e.g. surface sealing due to urbanization, deforestation) increase runoff and sedimentation. Inefficiency or non-maintenance of infrastructure etc.
      • Outdated Drainage systems: The old and ill-maintained drainage system is one of the main factor making cities in India vulnerable to flooding
      • Encroachments on and around water-bodies: Illegal Habitations started growing into towns and cities alongside rivers and watercourses. As a result of this, the capacity of the natural drains has decreased, resulting in flooding.
      • Climate Change: Climate change due to various anthropogenic events has led to extreme weather events, increasing temperature which resulting in heavy rainfall in one part while drought and dry spells in other.
      • Poor Solid Waste Management System: Indiscriminate disposal of solid waste, poor waste management system, clogging drains because of accumulation of non-biodegradable wastes are major concerns. Domestic, commercial and industrial waste and dumping of it into the drains also contribute significantly to reducing their capacities.
      • Reduced Seepage: use of hard and non-porous construction material making the soil impervious, reducing the seepage capability in no of cities in India.
      • Weak Implementation and lack of awareness:Even with provisions of rainwater harvesting, sustainable urban drainage systems, etc, in regulatory mechanisms like the Environmental Impact Assessment (EIA), adoption at user end as well as enforcement agencies remains weak.
      • No Community Participation:Flood control measures planned without participation of the affected community are unsustainable as they do not meet the needs of relevant stakeholders.

    What can be done to prevent the urban floods and prevent losses?

    • Developing climate Resilient Infrastructure: using permeable material for roads and pavement, green roofs and harvesting systems in buildings. To reduce the burden of road infrastructure in cities Outer Ring Road should be explored. Innovative approaches like Sponge Cities wetland restoration, flushing systems using collected rooftop water, public spaces as flexible water retention facilities can be applied to Indian urban areas.
    • Use of technology in Early Warning Systems and Communication: Early-warning systems using sensors across waterbodies and drains, and a network of communication for hotspots of emerging flood risk in the wet-season should be put in place. Providing real-time data where traditional systems fail. Tools such as predictive precipitation modelingcan help do that and are also able to link it with the adaptive capacity of urban land use.
    • Proper management and regular upgrade of Urban Drainage System: drains need to be cleaned on a regular basis to permit the free flow of water .Proper management of the drainage system is necessary to ensure that the water does not get stored in one place. Watershed management and emergency drainage plan should be clearly enunciated in policy.
    • Rainwater Harvesting: It will serve the twin purposes of lowering the peak runoff and raising the groundwater table. Many municipal corporations in India have already made rainwater harvesting compulsory. 
    • Conservation of Water Bodies: Urban water bodies like lakes, tanks, and ponds also play a very important role in the management of urban flooding by reducing the flood water run-off by capturing it.
    • Holistic approach: Improved monitoring, forecasting, and decision-support systems. Find out the different method for improving the preparedness for urban flooding.
    • Responsibility on every stakeholder: Locally, citizens, local ward officials and staff will need to work together to minimize dumping of solid waste and garbage in storm-water drains. As this is a socio –political problem, public participation awareness and responsibility of citizen is the need of the hour. To develop a long-lasting solution, all parties must acknowledge the issues and adopt a thorough strategy.

    What we as citizens can do on a personal level to prevent the urban environment?

    • Raising voice at all available forums and platforms
    • Making politicians and bureaucrats accountable
    • Refuse to buy a house in the encroached lands.
    • Applying methods of rain water harvesting on individual level.

    Way ahead

    • Exceptionally heavy monsoon rains have been exacerbated by poor urban planning in the Indian tech hub, showing the need for improved water systems.
    • Urbanization is a global and inevitable process, and with cities as engines of the economy, built-up areas will continue to grow. But we need to draw upon these experiences and the growing perils of climate change and extreme rain events and change course.
    • According to UN projections, by 2050 more than 68% of the world’s population could be concentrated in urban areas.
    • In this context, resilience-based strategies should be adopted to improve the capacity to handle the crisis arising out of climate change.
    • Wetlands are the kidneys of the earth, let’s keep it healthy.

     

    Mains Question

    Q. What are the factors causing flood in the urban cities? What are the measures to prevent the urban flooding keeping in mind the sustainable development? Discuss.

     

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  • Southwest Monsoon begins early Withdrawal/Retreat

    The southwest monsoon rainfall, 7% more than normal, has started to withdraw.

    What is Monsoon Withdrawal/Retreat?

    • In India, retreating monsoon is the withdrawal of south-west monsoon winds from North India.
    • The withdrawal is gradual and takes about three months.
    • With the retreat of the monsoons, the clouds disappear and the sky becomes clear. The day temperature starts falling steeply.
    • Monsoon rains weaken all over India except few southeastern states.
    • It is helpful in Rabi crop cultivation.

    Factors affecting the retreat

    Two predominant factors cause the phenomenon:

    (1) Land topography

    • First, the low mountain range in each region runs from north to south, shielding it from west-bound winds that trigger summer monsoon.
    • After summer, the range aids in the ‘orographic lift’ or rising of east-bound air mass from a lower to higher elevation, forming clouds and resulting in rain.

    (2) Atmospheric convection

    • The second factor is atmospheric convection or vertical movement of air.
    • As the earth is heated by the sun, different surfaces absorb different amounts of energy and convection may occur where the surface heats up very rapidly.
    • As the surface warms, it heats the overlying air, which gradually becomes less dense than the surrounding air and begins to rise.
    • This condition is more favorable from September to February because of the role played by sea surface temperature or water temperature.

    Immediate factors influencing withdrawal

    • The withdrawal of the monsoon is based on meteorological conditions such as-
    1. Anti-cyclonic circulation (dry air that is the opposite of a cyclone)
    2. Absence of rain in the past five days and
    3. Dry weather conditions over the region

    When does it occur?

    • The monsoon withdrawal is a long-drawn process and extends into mid-October, though the IMD considers September 30 to be the final day of the season over India.
    • The rain after that is categorised as “post-monsoon” rainfall.

    Try this PYQ:

    Q.The seasonal reversal of winds is the typical characteristic of:

    (a) Equatorial climate

    (b) Mediterranean climate

    (c) Monsoon climate

    (d) All of the above climates

     

    [wpdiscuz-feedback id=”9s1wlwig7j” question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

     

    Also read:

    Various terms related to Indian Monsoon

     

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  • What is a Triple-Dip La Nina?

    nina

    Parts of the world are expected to experience severe weather for the rest of the year and into 2023, as part of a rare “triple dip La Nina” event, according to the World Meteorological Organization (WMO).

     What is the “Triple-Dip” La Nina?

    • A “triple-dip” La Nina is a multiyear cooling of the surface temperature of the equatorial Pacific Ocean, which can cause droughts, fierce winds and heavy rainfall.
    • According to WMO, the current La Nina is projected to span three consecutive northern hemisphere winters. It began in September 2020.
    • If it continues for the next six months, it will be the first “triple-dip” La Nina event of the 21st century, WMO says.

    How rare is this triple-dip?

    • It is exceptional to have three consecutive years with a la Nina event.
    • Its cooling influence is temporarily slowing the rise in global temperatures – but it will not halt or reverse the long-term warming trend.
    • La Nina’s are usually preceded by El Nino, a weather pattern that warms the surface of the eastern tropical Pacific Ocean.
    • However, an El Nino event did not occur before the current La Nina.

    Has it happened before? Will it happen again?

    • La Nina’s occurred several times between 1903 to 2010 and 2010 to 2012.
    • This would be the first “triple-dip” La Nina this century.
    • However, it is not unprecedented for the weather pattern to last more than nine months to a year, which is typical for a La Nina.

    Evaluating the likely impact

    • In the Indian context, La Nina is associated with good rainfall during the monsoon season.
    • This is the opposite of El Nino which is known to suppress monsoon rainfall.
    • Thus, a continued spell of La Nina could lead to expectation of another year of good, or normal, rainfall during the monsoon.
    • Until now, the monsoon season this year has produced 7% more rain compared to normal. Last year, the seasonal rainfall was almost 100%.
    • But, even though powerful, ENSO condition is only one of the several factors affecting monsoon rainfall in India.

    Impact on rainfall

    • There is no one-on-one correlation between the ENSO condition and the amount of rainfall.
    • Also, the influence of ENSO is at a macro level.
    • There are wide variations in rainfall at the local level, which are getting exacerbated by climate change.

    Differential impacts of this triple-dip event

    • The continuance of La Nina further into 2023 is not bad news from the Indian standpoint. But it is not the same for many other regions where La Nina has very different impacts.
    • In most parts of the United States, for example, La Nina is associated with very dry winters.
    • In Australia and Indonesia, and generally in the tropical region, La Nina is expected to bring more rainfall.
    • The excessive rainfall in Pakistan, which is experiencing its worst flooding disaster, can also be blamed in part on La Nina.
    • It said that the persistence of La Nina was most likely to result in a worsening of the drought in Africa.

    What is its climate change link?

    • Every unusual weather event these days is attributed to climate change, but science is not conclusive right now.
    • The occurrences of El Nino or La Nina are not very regular.
    • Sometimes they emerge every two years, at other times there has been a gap of even seven years.
    • Historical records do not go very far in the past.
    • As a result, the natural variability of ENSO is not understood very clearly.
    • And when the natural variability itself is not clear, the influence of global warming is difficult to quantify.
    • But there is clearer evidence of another kind of linkage with global warming.
    • During La Nina years, the colder surfaces allow the oceans to absorb more heat from the atmosphere.
    • Consequently, the air temperatures tend to go down, producing a cooling effect.

     

     

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  • What are the Big Seven Cats?

    We often get confused to differentiate between Cheetah/Bagh/Sher/Puli. The cheetah, which is being re-introduced to India from Africa, is not to be confused with the leopard, which too has spots that look somewhat similar.

    How are all Big Cats differentiated?

    [A] Genus Panthera

    • This is the genus of large wild cats that can roar but can’t purr.
    • Among them, the lion, the leopard, and the jaguar are more closely related, while the other strand has the tiger and the snow leopard.
    • The snow leopard is an exception to the rest of the group in that it can’t roar.

    (1) Tiger (Panthera Tigris)

    Size: 75-300 kg | IUCN status : Endangered

    • Jim Corbett’s “large-hearted gentleman with boundless courage”, the solitary and strongly territorial tiger is the largest of all wild cats and also the earliest Panthera member to exist.
    • Primarily a forest animal, they range from the Siberian taiga to the Sunderban delta.
    • The national animal of India, Bangladesh, Malaysia, and South Korea, the tiger was voted the world’s favourite animal ahead of the dog in a 2004 Animal Planet global online poll.

    (2) Lion (Panthera Leo

    Size: 100-250 kg | IUCN status: Vulnerable

    • Native to Africa and Asia, the lion is the most social cat, and lives in groups called prides.
    • They prefer open forests such as scrubland, and adult males have a prominent mane.
    • The lion is arguably the most widely recognised animal symbol in human culture — be it the Ashoka pillar in Sarnath, the main entrance to Buckingham Palace, or the 20th Century Fox and MGM logo.

    (3) Jaguar (Panthera Onca)

    Size: 50-110 kg | IUCN status: Near Threatened

    • The largest cat in the Americas, the Jaguar has the strongest bite force of all wild cats, enabling it to bite directly through the skull of its prey.
    • Melanistic (black) Jaguars are common and are often called black panthers.
    • Jaguar was a powerful motif in the Mayan and Aztec civilisations.

    (4) Leopard (Panthera Pardus)

    Size: 30-90 kg | IUCN status: Vulnerable

    • Similar in appearance to the Jaguar with a rosette patterned coat, the leopard was described by Jim Corbett as “the most beautiful of all animals” for its “grace of movement and beauty of colouring”.
    • The most adaptable of all big cats, they occupy diverse habitats at all altitudes across Africa and Asia.
    • Like black jaguars, melanistic leopards are called black panthers.
    • In some African cultures, leopards are considered to be better hunters than lions.

    (5) Snow leopard (Panthera Uncia)

    Size: 25-55 kg | IUCN status : Vulnerable

    • The ghost of the mountains, this smokey-grey cat lives above the snow line in Central and South Asia.
    • The most elusive of all big cats, it cannot roar, and has the longest tail of them all — which comes in handy for balance while hunting along the cliffs, and also gives warmth when wrapped around the body.
    • The snow leopard is the state animal of Ladakh and Himachal Pradesh.

    [B] Genus Puma

    • Closely related to the domestic cat, this genus has only one extant species, the cougar.

    Cougar (Puma concolor)

    Size: 40-100 kg | IUCN status: Least Concern

    • The cougar is the second-largest cat in the Americas. (The Jaguar is the largest.)
    • Cougars are also called ‘mountain lion’ and ‘panther’ across their range from the Canadian Yukon to the Southern Andes.
    • Concolor is latin for “of uniform colour”. The Incas designed the city of Cusco in the shape of a cougar.

    [C] Genus Acinonyx

    • This is a unique genus within the cat family, with only one living member, the cheetah.

    Cheetah (Acinonyx jubatus)

    Size: 20-70 kg | IUCN status: Vulnerable

    • The fastest land mammal, the cheetah is the only cat without retractable claws — the grip helps it accelerate faster than any sports car (0-100 km/hr in 3 seconds).
    • Cheetahs are not aggressive towards humans, and they have been tamed since the Sumerian era.
    • They don’t breed well in captivity — picky females play hard to get.
    • Cheetahs are not really big, and they hunt during the day to avoid competing with other big cats.

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  • UNEP launches Green Fins Hub

    fins

    The United Nations Environmental Programme (UNEP) has launched the Green Fins Hub, a global digital platform to give sustainable marine tourism a ‘major boost’.

    Green Fins Hub

    • The Green Fins Global Hub will be a first-of-its-kind online support system to motivate scuba operators to improve their daily environmental practices at scale.
    • It aims to help diving and snorkeling operators worldwide to make simple, cost-efficient changes to their daily practices by utilizing tried and tested solutions.
    • It would also help them keep track of their annual improvements and communicate with their communities and customers.

    Membership of Green Fins Hub

    • It will host two types of membership. One would be digital membership available for diving, snorkelling and liveaboard operations globally.
    • Throughout every year of membership, operators will receive environmental scores based on a detailed online self-evaluation and progress made on their action plans.
    • The Certified Members will continue to be assessed annually and trained in person at their operation.
    • The platform will be for operators around the world to raise industry needs, discuss environmental issues and share lessons and ideas with like-minded industry leaders, non-profits and governments.

     

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  • Cheetah reintroduction

    Cheetah

    Context

    • This is the world’s first intercontinental translocation of a carnivore. It is even more unique because this is the first time cheetahs has reintroduced in an unfenced protected area (PA).
    • The Government is preparing to translocate the first batch from South Africa and Namibia to Kuno National Park in Madhya Pradesh.

    About Asiatic Cheetah

    • Feature: Cheetah, the world’s fastest land animal was declared extinct in India in 1952.
    • Status: The Asiatic cheetah is classified as a “critically endangered” species by the IUCN Red List, and is believed to survive only in Iran.
    • Reintroduction: It was expected to be re-introduced into the country after the Supreme Court lifted curbs for its re-introduction.
    • Extinction: From 400 in the 1990s, their numbers are estimated to have reached to 50-70 today, because of poaching, hunting of their main prey (gazelles) and encroachment on their habitat.

    Cheetah

    Cheetah

    What caused the extinction of cheetahs in India?

    • Reduced fecundity and high infant mortality in the wild
    • Inability to breed in captivity
    • Sport hunting
    • Bounty killings

    Cheetah

    Why reintroduce Cheetahs?

    • Climate Change Mitigation: It will enhance India’s capacity to sequester carbon through ecosystem restoration activities in cheetah conservation areas and thereby contribute towards the global climate change mitigation goals.
    • Reintroductions of large carnivores have increasingly been recognized as a strategy to conserve threatened species and restore ecosystem functions.
    • The cheetah is the only large carnivore that has been extirpated, mainly by over-hunting in India in historical times.
    • India now has the economic ability to consider restoring its lost natural heritage for ethical as well as ecological reasons.

    Why was Kuno National Park chosen for Cheetah Reintroduction?

    • Both Cheetah and Asiatic Lions share the same habitats semi-arid grasslands and forests that stretch across Gujarat, Rajasthan, and Madhya Pradesh.
    • The rainfall, temperature, and altitude in the Sheopur district, where Kuno is situated, are equivalent to those of South Africa and Namibia.
    • In addition, Kuno contains a diverse population of prey species, including peafowl, wild pigs, gazelle, langurs, chital, sambhar, and nilgai.

    What are the Other Recent Initiatives for Wildlife Conservation in India?

    Legal Framework:

    • Wildlife (Protection) Act, 1972
    • Environment Protection Act, 1986
    • The Biological Diversity Act, 2002

    India’s Collaboration with Global Wildlife Conservation Efforts:

    • Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES)
    • Convention on the Conservation of Migratory Species of Wild Animals (CMS)
    • Convention on Biological Diversity (CBD)
    • Global Tiger Forum (GTF)

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  • Why Cloudbursts forecast in India still remains elusive?

    cloudbursts

    The characteristics of cloud burst events remain elusive, and our efforts in monitoring and forecasting them is at an embryonic stage.

    Cyclones can be predicted about one week in advance. However, cloudburst forecasts still remain elusive.

    What is Cloudbursts?

    • A cloudburst is a localised but intense rainfall activity.
    • Short spells of very heavy rainfall over a small geographical area can cause widespread destruction, especially in hilly regions where this phenomenon is the most common.
    • Not all instances of very heavy rainfall, however, are cloudbursts.
    • A cloudburst has a very specific definition: Rainfall of 10 cm or more in an hour over a roughly 10 km x 10-km area is classified as a cloudburst event.
    • By this definition, 5 cm of rainfall in a half-hour period over the same area would also be categorized as a cloudburst.

    Which clouds do burst?

    • Cloudburst events are often associated with cumulonimbus clouds that cause thunderstorms and occasionally due to monsoon wind surges and other weather phenomena.
    • Cumulonimbus clouds can grow up to 12-15 km in height through the entire troposphere (occasionally up to 21 km) and can hold huge amounts of water.
    • Tall cumulonimbus clouds can develop in about half an hour as the moisture updraft happens rapidly, at a pace of 60 to 120 km/hr.
    • A single-cell cloud may last for an hour and dump all the rain in the last 20 to 30 minutes, while some of these clouds merge to form multi-cell storms and last for several hours.
    • However, cloudbursts are not defined based on cloud characteristics and do not indicate clouds exploding. Cloudbursts are defined by the amount of rainfall.

    How is it different from normal rainfall?

    • According to the India Meteorological Department (IMD), 100 mm of rain in an hour is called a cloudburst.
    • Usually, cloudbursts occur over a small geographical region of 20 to 30 sq. km.

    When do they occur?

    • In India, cloudbursts often occur during the monsoon season, when the southwesterly monsoon winds bring in copious amounts of moisture inland.
    • The moist air that converges over land gets lifted as they encounter the hills.
    • The moist air reaches an altitude and gets saturated, and the water starts condensing out of the air forming clouds.
    • This is how clouds usually form, but such an orographic lifting together with a strong moisture convergence can lead to intense cumulonimbus clouds taking in huge volumes of moisture that is dumped during cloudbursts.

    How common are cloudbursts?

    • Cloudbursts are not uncommon events, particularly during the monsoon months.
    • Most of these happen in the Himalayan states where the local topology, wind systems, and temperature gradients between the lower and upper atmosphere facilitate the occurrence of such events.
    • However, not every event that is described as a cloudburst is actually, by definition, a cloudburst.
    • That is because these events are highly localized.
    • They take place in very small areas which are often devoid of rainfall measuring instruments.

    Climate change and cloudbursts: How are they related?

    • Climate change is projected to increase the frequency and intensity of cloudbursts worldwide.
    • As the air gets warmer, it can hold more moisture and for a longer time. We call this the Clausius Clapeyron relationship.
    • A 1-degree Celsius rise in temperature may correspond to a 7-10% increase in moisture and rainfall.
    • This increase in rainfall amount does not get spread moderately throughout the season.
    • As the moisture holding capacity of air increases, it results in prolonged dry periods intermittent with short spells of extreme rains.
    • Deeper cumulonimbus clouds will form and the chances of cloudbursts also increase.

    Why are they so destructive?

    • The consequences of these events, however, are not confined to small areas.
    • Because of the nature of terrain, the heavy rainfall events often trigger landslides and flash floods, causing extensive destruction downstream.
    • This is the reason why every sudden downpour that leads to destruction of life and property in the hilly areas gets described as a “cloudburst”, irrespective of whether the amount of rainfall meets the defining criteria.
    • At the same time, it is also possible that actual cloudburst events in remote locations aren’t recorded.

    Detecting cloudbursts

    • Satellites are extensively useful in detecting large-scale monsoon weather systems.
    • However the resolution of the precipitation radars of these satellites can be much smaller than the area of individual cloudburst events, and hence they go undetected.
    • Weather forecast models also face a similar challenge in simulating the clouds at a high resolution.
    • The skillful forecasting of rainfall in hilly regions remains challenging due to the uncertainties in the interaction between the moisture convergence and the hilly terrain.
    • There also involves the cloud microphysics, and the heating-cooling mechanisms at different atmospheric levels.
    • Multiple radars can be a quick measure for providing warnings, but radars are an expensive affair, and installing them across the country may not be practically feasible.

    Solutions to cloudbursts forecast

    • Multiple doppler weather radars can be used to monitor moving cloud droplets and help to provide nowcasts (forecasts for the next three hours).
    • A long-term measure would be mapping the cloudburst-prone regions using automatic rain gauges.
    • If cloudburst-prone regions are co-located with landslide-prone regions, these locations can be designated as hazardous.

     

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  • What is Karoo-Ferrar Large Igneous Province?

    karoo

    A new study shows that a decline in continental plate movement likely controlled the onset and duration of many of the major volcanic events throughout Earth’s history.

    Why is the news?

    • Previous studies have linked major volcanic eruptions with past mass extinctions and disturbances in the global climatic, environmental and the carbon cycle.
    • Large igneous province volcanism, formations due to major volcanic eruptions occurring throughout Earth’s history, released large quantities of greenhouse gasses and toxic compounds into the atmosphere.
    • The sea warmed up by 4°C to 10°C, even at low- to mid-latitudes, the study noted.
    • Increased acidic levels and a lack of oxygen drove major ocean extinctions.
    • Large-scale volcanism took place in southern Africa, Antarctica and Australia. This is known as the Karoo-Ferrar Large Igneous Province.

    About Karoo-Ferrar Large Igneous Province

    • The Karoo and Ferrar Large Igneous Provinces (LIPs) are two large igneous provinces in Southern Africa and Antarctica respectively, collectively known as the Karoo-Ferrar, Gondwana, or Southeast African LIP associated with the initial break-up of the Gondwana supercontinent.
    • Its flood basalt mostly covers South Africa and Antarctica but portions extend further into southern Africa and into South America, India, Australia and New Zealand.
    • Karoo-Ferrar formed just prior to the breakup of Gondwana in the Lower Jurassic epoch, about 183 million years ago.
    • This time corresponds to the early Toarcian anoxic event and the Pliensbachian-Toarcian extinction.

     

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