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Subject: Geography

  • [pib] Ravines of Chambal-Gwalior Region

    Union Minister of Agriculture & Farmers’ Welfare held a meeting with World Bank representatives to bring large Ravines of Gwalior–Chambal region under agriculture.

    Try this question for mains:

    Q.What is Badland Topography? Discuss the scope of their utilization as arable land in India.

    What are Ravines?

    • Badland topography is a major feature of the Chambal valley is characterized by an undulating floodplain, gullies and ravines.
    • Ravines are a type of fluvial erosional feature and are formed as a result of constant vertical erosion by streams and rivers flowing over semi-arid and arid regions.

    How are they formed?

    • Researchers consider the regional climate as a major factor in the formation of ravines.
    • Climate indeed plays a huge role by supplying the water in the form of rain or snow as well as providing the temperature variations.
    • However, the ravines of Chambal are a bit difficult to be explained solely on climatic terms.
    • The region through which the Chambal River flows does not receive enough rainfall to create ravines that are 60–80 m deep.
    • Researchers have attributed neotectonic activities to the Chambal ravines genesis.

    Other factors

    • It is well known that rivers are full of energy and actively erode in their initial phases and progressively become passive as they attain their base levels.
    • But sometimes, due to tectonic movements, the base level may be lowered further thus energizing the river and reactivating the erosion. This is known as River Rejuvenation.
    • Moreover, wind erosion has also contributed to the formation of Chambal ravines.

    Back2Basics: What are Badlands?

    • Badlands are erosional landforms of highly dissected morphology that are created on soft bedrock in a variety of climate conditions.
    • They develop in arid to semiarid areas where the bedrock is poorly cemented and rainfall is generally heavy and intermittent.
    • The dry, granular surface material and light vegetation are swept from the slopes during showers, leaving the gullies bare.

  • Lonar Lake turned pink due to ‘Haloarchaea’ microbes

    The colour of Lonar lake water in Maharashtra’s Buldhana district turned pink due to a large presence of the salt-loving ‘Haloarchaea’ microbes, a probe carried out by a Pune-based institute has concluded.

    Make a note of all saltwater lakes in India. Few of them are Pulicat, Pangong Tso, Chilika, and Sambhar Lakes etc.

    Haloarchaea’ microbes

    • Haloarchaea or halophilic archaea is a bacteria culture which produces pink pigment and is found in water saturated with salt.
    • The increased salinity and pH facilitated the growth of halophilic microbes, mainly Haloarchaea.
    • Basically, it is the biomass of these microbes and because of that, the surface of the water turned red or pink and as soon as the biomass subsided, the colour disappeared.
    • The scientist said the colour of the lake is now returning to original as the rainy season has kicked in, allowing dilution of the water.
    • Initially, it was thought for the red-pigmented Dunaliella algae due to which the water might have turned pink.
    • Because of that, the salinity and pH/alkalinity levels have also come down and green algae have started growing in the water body.

    About Lonar Lake

    • Lonar Lake, also known as Lonar crater, is a notified National Geo-heritage Monument, saline (pH of 10.5), Soda Lake, located at Lonar in Buldhana district, Maharashtra.
    • It was created by an asteroid collision with earth impact during the Pleistocene Epoch.
    • It is one of the four known, hyper-velocity, impact craters in basaltic rock anywhere on Earth.
    • It sits inside the Deccan Plateau—a massive plain of volcanic basalt rock created by eruptions some 65 million years ago.
    • Its location in this basalt field suggested to some geologists that it was a volcanic crater.

  • National Flood Commission

    At least 43 years after India’s first and last commission on floods was constituted, there is no national-level flood control authority in the country so far.

    Try this question for mains:
    Q. What are the various causes of urban floods in India?

    National Flood Commission

    • Rashtriya Barh Ayog or the National Flood Commission (NFC) was set up by the Ministry of Agriculture and Irrigation in 1976.
    • It aimed to study India’s flood-control measures after the projects launched under the National Flood Control Programme of 1954 failed to achieve much success.

    NFCs recommendation

    • In 1980, the NFC made 207 recommendations and four broad observations:
    • First, it said there was no increase in rainfall in India and, thus, the increase in floods was due to anthropogenic factors such as deforestation, drainage congestion and badly planned development works.
    • Second, it questioned the effectiveness of the methods adopted to control floods, such as embankments and reservoirs, and suggested that the construction of these structures be halted until their efficacy was assessed.
    • Third, it said there have to be consolidated efforts among the states and the Centre to take up research and policy initiatives to control floods.
    • Fourth, it recommended a dynamic strategy to cope with the changing nature of floods. An analysis of the report suggested that the problem began with the methods of estimating flood-prone areas of the country.

    Why revive NFC?

    • An accurate estimate is crucial for framing flood management programmes.
    • The NFC estimated that the total area vulnerable to floods in 1980 was around 40 million hectares.
    • There is another problem. The very definition of the flood-prone area does not reflect the effectiveness of the flood management works undertaken.

  • ‘Churachandpur Mao Fault’ in Mizoram

    Mizoram’s zone of “scary” earthquakes is caught between two subterranean faults called the ‘Churachandpur Mao Fault’.

    Try this question from CSE Mains 2014:

    Q.Why are the world’s fold mountain systems located along the margins of continents? Bring out the association between the global distribution of Fold Mountains and the earthquakes and volcanoes.

    Churachandpur-Mao Fault (CMF)

    • The CMF is named after two places in Manipur and runs north-south into Myanmar along the border of Champhai.
    • The Mat Fault runs northwest-southeast across Mizoram, beneath river Mat near Serchhip.
    • It is defined by straight valleys; most prominent being between Kangpokpi and Maram region of Mizoram.
    • The fault takes a north-easterly trend from Maram where the fault zone is characterized by active landslides during the monsoon.

    Why study CMF?

    • Faults are discontinuities or cracks that are the result of differential motion within the earth’s crust.
    • Vertical or lateral slippage of the crust along the faults causes an earthquake.

  • Rapid Intensification of Cyclones

    Tropical cyclones remain the deadliest natural climate hazard that causes an unacceptably high loss of life, property and infrastructure.  Global warming has already resulted in a detectable increase in the number of higher intensity cyclones as well as their intensification.

    Also read:

    [Burning Issue] Tropical Cyclones and India

    Try this question:

    Q. The Marsupial Theory often seen in news is related to which of the climatic phenomena?

    a) Heatwaves b) Monsoon Variability c) Formation of Cyclones d) Thunderstorms

    What is Rapid Intensification of Cyclones?

    • RI is defined as an increase in maximum sustained winds by at least 55 km/hour in a 24-hour period.
    • Such acceleration can only come with a rapid drop in the pressure in the eye of the cyclone.
    • Rapid intensification (RI) is making cyclone forecasts harder and intense cyclones with RI are expected to grow in number.
    • The lack of understanding of the transition from a seedling of a cyclone, like a low-pressure system to a tropical storm, limits extending the forecast lead times.

    Factors causing RI

    The most important environmental factors for cyclone genesis are-

    • the rotation or vorticity of a low-pressure system at the surface;
    • sea surface temperatures or the volume of warm water available;
    • the vertical motion of air in this low-pressure system;
    • the amount of humidity available in the middle atmosphere and
    • the vertical shear or the change in winds from the surface to the upper atmosphere.

    MJO and Cyclones

    • Madden-Julian Oscillations as they are known, dominate the tropics during October-April by propagating from the western Indian Ocean into the eastern Indian Ocean, across the Indonesian seas into the Pacific Ocean.
    • Referred to as MJOs, these Madden-Julian Oscillations throw seeds of rotational low-pressure systems over the Indian and the Pacific Oceans.
    • And thus, MJOs show a strong association with cyclogenesis, especially for the post-monsoon season.

    Impacts of MISO

    • Monsoon Intraseasonal Oscillations (MISO) are alternating periods of heavy and minimal rainfall, each lasting for about a month or so and tending to follow a cyclical, northward shifting pattern from the equator to southern Asia.
    • While the strong vertical shear suppresses cyclones during the monsoon season, MISOs influence cyclone genesis during the pre-monsoon season.

    Other factors

    • At longer timescales, phenomena like the El Niño and La Niña influence not only the number of cyclone seeds but also the location and the expanse of warm water.
    • For example, during the pre-monsoon season of La Niña year, the region of warm water over the Bay of Bengal increases. This leads cyclones to travel longer and grow stronger than during an El Niño year.
    • Over the Pacific Ocean, on the other hand, it is the El Niño that provides a larger swath of warm water and more intense cyclones.
    • West Africa produces waves called easterly waves that propagate west from land onto the tropical Atlantic Ocean and sow the seeds for most hurricanes.
    • Extensive analysis has produced theories that are evocatively called the Marsupial Theory — a wave pouch that allows cyclones to grow, or waves interacting to produce a Kelvin cat’s eye, which is a ‘sweet-spot’ for the birth of a cyclone.

  • The lost continent of Zealandia

    A new map has revealed the lost continent of Zealandia.

    The ocean relief can be divided into various parts such as Continental Shelf, Continental Slope, Continental Rise or Foot, Deep Ocean basins, Abyssal plains & Abyssal Hills, Oceanic Trenches, Seamounts and Guyots.

    Revise these ocean bottom relief features from your basic references.

    Also revise India’s Deep Ocean Mission.

    About Zealandia

    • Zealandia — or Te Riu-a-Māui, as it’s referred to in the indigenous Māori language — is a 2 million-square-mile (5 million square kilometres) continent east of Australia, beneath modern-day New Zealand.
    • Scientists discovered the sprawling underwater mass in the 1990s, then gave it formal continent status in 2017.
    • Still, the “lost continent” remains largely unknown and poorly studied due to its Atlantean geography.

    Its formation

    • It is a group of submerged pieces of crust that separated from the ancient supercontinent Gondwana about 85 million years ago.
    • Gondwana was formed when Earth’s ancient supercontinent, Pangea, split into two fragments.
    • Laurasia was transformed into North America, Asia, and Europe, while Gondwana became Africa, South America, Australia, and Antarctica.
    • But land masses continued to be rearranged afterwards, with Zealandia breaking off Gondwana.

    Data revealed by the new map

    • The new maps reveal Zealandia’s bathymetry (the shape of the ocean floor) as well as its tectonic history, showing how volcanism and tectonic motion have shaped the continent over millions of years.
    • Data for the bathymetric map was provided by the Seabed2030 project — a global effort to map the entire ocean floor by 2030.

    Why call it a continent?

    • Zealandia was classified as a “microcontinent,” as the island of Madagascar, until 2017.
    • But according to Mortimer, it has all the requirements to be classified as a continent.
    • It has defined boundaries; it occupies an area of over one million square kilometres and is elected above the ocean crust.

    Also read: https://www.civilsdaily.com/news/seabed-2030-project/

  • What is ‘Last Glacial Maximum’?

    Researchers analysed simulations of this past climate and predicted that the ongoing climate change could reawaken an ancient climate pattern of the Indian Ocean Region (IOR).

    Try this question from CSP 2017:

    Q.With reference to ‘Indian Ocean Dipole (IOD)’, sometimes mentioned in the news while forecasting Indian monsoon, which of the following statements is/are correct?

    1. IOD phenomenon is characterized by a difference in sea surface temperature between tropical Western Indian Ocean and tropical Eastern Pacific Ocean.

    2. An IOD phenomenon can influence El Nino’s impact on the monsoon.

    Select the correct Option using the code given below:

    (a) Only 1

    (b) Only 2

    (c) Both 1 and 2

    (d) Neither 1 nor 2

    The Last Glacial Maximum

    • The Last Glacial Maximum (LGM) was the most recent time during the Last Glacial Period that ice sheets were at their greatest extent.
    • Vast ice sheets covered much of North America, Northern Europe, and Asia and profoundly affected Earth’s climate by causing drought, desertification, and a large drop in sea levels.
    • Growth of ice sheets commenced 33,000 years ago and maximum coverage was between 26,500 years and 19–20,000 years ago, when deglaciation commenced in the Northern Hemisphere.
    • It caused an abrupt rise in sea level.

    Shells predict IOR climate variability

    • By studying microscopic zooplankton called foraminifera, the team had published a paper in 2019 which first found evidence from the past of an Indian Ocean El Niño.
    • Foraminifera builds a calcium carbonate shell, and studying these can tell us about the properties of the water in which they lived.
    • The team measured multiple individual shells of foraminifera from ocean sediment cores and was able to reconstruct the sea surface temperature conditions of the past.
    • The Indian Ocean has the capacity to harbour much larger climate variability than observed during the last few decades or a century.

    Lessons to learn

    • There are many lessons to be learnt from this cooler period about our warmer future.
    • As it is, under present-day conditions, changes in the Indian Ocean Dipole and the El Niño–Southern Oscillation strongly affect Indian Monsoon variability from year to year.
    • If the hypothesized ‘equatorial mode’ emerges in the near future, it will pose another source of uncertainty in rainfall prediction and will likely amplify swings in monsoon rainfall.
    • It could bring more frequent droughts to East Africa and southern India and increased rainfall over Indonesia.

    Back2Basics

    What is the Indian Ocean Dipole? Explain its connection with the Indian monsoons

  • What is the Anthropause Period?

    Researchers in the UK are set to study the “Anthropause”, a term they have coined to refer to the coronavirus-induced lockdown period and its impact on other species.

    Practice question for mains:

    Q. What is the significance of declaring Anthropocene epoch? Discuss how it is different from any geological events. Discuss the Anthropause Period.

    Anthropause Period

    • Researchers have suggested the lockdown period, which is also being referred to as the “Great Pause”, be referred to with a more precise term.
    • It is referred specifically to a considerable global slowing of modern human activities, notably travel.
    • The unprecedented curbs imposed on millions of people around the world, mainly due to restrictions in travel, led to reports of unusual animal behaviour.
    • For instance, there were pumas sighted in Chile’s Santiago, jackals in the parks of Tel Aviv in Israel, dolphins in the waters of Italy and even a monkey fight on the streets of Thailand.
    • The researchers believe studying this period will provide valuable insights into the relationship between human-wildlife interactions in the 21st century.

    What do the researchers hope to find?

    • As a result of the lockdown, nature appears to have changed, especially in urban environments, since not only are there now more animals, but also some “unexpected visitors.”
    • In their outline, researchers mention how the scientific community can use these “extraordinary circumstance” provided by global lockdowns to understand how human activity affects wildlife.
    • On the other hand, there are some animals for which the lockdown may have made things more challenging.
    • For instance, for various urban-dwelling animals, such as rats, gulls and monkeys who depend on food provided or discarded by humans, the lockdown would have made life more difficult.

    Why is studying the lockdown important?

    • Expanding human populations continue to transform their environments at unprecedented rates.
    • Further, because the reduction in human activity during the lockdown on both land and sea has been “unparalleled” in recent history, the effects have been “drastic, sudden and widespread”.
    • Essentially, this gives them a chance to study the extent to which modern human mobility affects wildlife.
    • The study can be linked can help provide insights that may be useful in preserving global biodiversity, maintaining the integrity of ecosystems and predicting global zoonoses and environmental changes.

    Back2Basics

    https://www.civilsdaily.com/news/anthropocene-as-earths-new-epoch/

  • We need National Plan for Covid-19

    The Disaster Management Act (DMA) 2005 has been invoked by the government to deal with the pandemic. However, National Plan as provided under the Act to deal with Covid-19 is nowhere to be found. Also, the creations of PM CARES violated the provision of the DMA-2005. These two issues are discussed here.

    Provisions of DMA 2005

    • The Act, along with other things provides the constitution of a National Authority, a National Executive committee.
    • It also provides for the constitution of an advisory committee of experts in the field to make recommendations and to prepare a national plan.
    • This plan must provide for measures for prevention or mitigation.
    • The Act lays down “guidelines for minimum standards of relief, including ex gratia assistance.

    Provision of various Funds under DMA 2005

    • It enables the creation of a National Disaster Response Fund in which the central government must make due contribution.
    • It also requires “any grants that may be made by any person or institution for the purpose of disaster management” to be credited into the same Fund.
    • It also provides for a National Disaster Mitigation Fund, exclusively for mitigation.
    • The Act also provides for State and local-level plans and for creating State Disaster Response Fund among others.

    Provision of disaster management plan

    • After the direction by the SC, the government came out with a National Disaster Management Plan (NDMP), 2016.
    • This Plan dealt with various kinds of disasters; it was amended in 2019.
    • Bu this National Plan not in place now.
    • Without it, the fight against COVID-19 is ad hoc and has resulted in thousands of government orders.
    • These orders are confusing those who are to enforce them as well as the public.

    NDRF and PM CARES issue

    • On April 3, 2020, the government of India agreed to contribute its share to the NDRF.
    • But a public charitable trust under the name of Prime Minister’s Citizen Assistance and Relief in Emergency Situations Fund (PM CARES Fund) was set up to receive grants made by persons and institutions out of the NDRF, in violation of Section 46 of the Act.
    • The crores being sent to this fund are not even audited by the Comptroller and Auditor General (CAG) of India.
    • It is a totally opaque exercise.
    • The government of the day has not only ignored the binding law but also circumvented it.
    • The government has been fighting the crisis in an ad hoc and arbitrary manner instead of the organised steps as mandated by the Act.
    • In so doing, the experts have been sidelined.

    Consider the question “Describe the various provision of the DMA 2005 to deal with the disaster. In light of this, examine whether the creation of PM CARES conflicts with the provision of his act”

    Conclusion

    The national plan to deal with the pandemic and making PM CARES more transparent would help the government in its fight against the corona crisis.

  • Seabed 2030 Project

    The Seabed 2030 Project has finished mapping nearly one-fifth of the world’s ocean floor.

    The ocean relief can be divided into various parts such as Continental Shelf, Continental Slope, Continental Rise or Foot, Deep Ocean basins, Abyssal plains & Abyssal Hills, Oceanic Trenches, Seamounts and Guyots.

    Revise these ocean bottom relief features from your basic references.

    Also revise India’s Deep Ocean Mission.

    The Seabed 2030 Project

    • The global initiative is a collaboration between Japan’s non-profit Nippon Foundation and the General Bathymetric Chart of the Oceans (GEBCO).
    • It is the only intergovernmental organisation with a mandate to map the entire ocean floor and traces its origins to the GEBCO chart series initiated in 1903 by Prince Albert I of Monaco.
    • The project was launched at the UN Ocean Conference in 2017, and coordinates and oversees the sourcing and compilation of bathymetric data from different parts of the world’s ocean.

    What’s so special about this project?

    • In the past, satellites and planes carrying altimeter instruments have been able to provide large swathes of data about the ocean floor.
    • The Seabed 2030 Project, however, aims to obtain higher quality information that has a minimum resolution of 100 m at all spots.
    • It is using equipment such as deepwater hull-mounted sonar systems, and more advanced options such as Underwater Vehicles (AUVs).
    • For this, the project aims to rope in governments, private companies, and international organisations to acquire data.

    Progress of the project

    • Since the launch of the project in 2017, the surveying of the ocean bed as per modern standards has gone up from around 6 per cent to 19 per cent.
    • The project has added 1.45 crore square kilometres of new bathymetric data to its latest grid.

    Why is the study of the ocean floor important?

    • Ocean topography: The knowledge of bathymetry — the measurement of the shape and depth of the ocean floor, is instrumental in understanding several natural phenomena, including ocean circulation, tides, and biological hotspots.
    • Navigation: It also provides key inputs for navigation, forecasting tsunamis, exploration for oil and gas projects, building offshore wind turbines, fishing resources, and for laying cables and pipelines. This data becomes highly valuable during disaster situations.
    • Climate Change study: Importantly, the maps would also ensure a better understanding of climate change, since floor features including canyons and underwater volcanoes influence phenomena ocean currents. These ocean currents act as conveyor belts of warm and cold water, thus influencing the weather and climate.
    • Marine conservation: A map of the entire global ocean floor would also help further achieve the United Nations Sustainable Development Goal to conserve and sustainably use oceans, seas and marine resources.

    Try this PYQ from CSP 2012:

    Q.Consider the following factors:

    1. Rotation of the Earth
    2. Air pressure and wind
    3. Density of ocean water
    4. Revolution of the Earth

    Which of the above factors influence the ocean currents?

    (a) 1 and 2 only

    (b) 1, 2 and 3

    (c) 1 and 4

    (d) 2, 3 and 4