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Subject: Geography

  • Various terms related to Indian Monsoon

    The monsoon is likely to begin withdrawing from the mainland from October 6, said the India Meteorological Department (IMD).

    Let us learn all terminologies related to Monsoon.

    What is Monsoon?

    • Indian monsoon, the most prominent of the world’s monsoon systems, which primarily affects India and its surrounding water bodies.
    • It blows from the northeast during cooler months and reverses direction to blow from the southwest during the warmest months of the year.

    Onset of Monsoon

    • This process brings large amounts of rainfall to the region during June and July.
    • As the high-sun season (that is, the Northern Hemisphere summer) moves northward during April, India becomes particularly prone to rapid heating because the highlands to the north protect it from any incursions of cold air.
    • There are three distinct areas of relative upper tropospheric warmth—namely, (1) above the southern Bay of Bengal, (2) above the Plateau of Tibet, and (3) across the trunks of the various peninsulas that are relatively dry during this time.
    • These three areas combine to form a vast heat-source region.
    • In contrast, a heat sink appears over the southern Indian Ocean as the relatively cloud-free air cools by emitting long-wavelength radiation.
    • Monsoon winds at the surface blow from heat sink to heat source.

    Peak period

    • The position of the easterly jet controls the location of monsoonal rains, which occur ahead and to the left of the strongest winds and also behind them and to the right.
    • The surface flow, however, is a strong, south-westerly, humid, and unstable wind that brings humidifies of more than 80 percent and heavy squally showers that are the “burst” of the monsoon.
    • The overall pattern of the advance follows a frontal alignment, but local episodes may differ considerably.

    Key areas

    • Most spectacular clouds and rain occur against the Western Ghats in India, where the early monsoonal airstream piles up against the steep slopes, then recedes, and piles up again to a greater height.
    • Each time it pushes thicker clouds upward until wind and clouds roll over the barrier and, after a few brief spells of absorption by the dry inland air, cascade toward the interior.
    • Various factors, especially topography, combine to make up a complex regional pattern.

    Break in Monsoon

    • During the south-west monsoon period after having rains for a few days, if rain fails to occur for one or more weeks, it is known as break in the monsoon.
    • These dry spells are quite common during the rainy season.
    • In northern India rains are likely to fail if the rain-bearing storms are not very frequent along the monsoon trough or the ITCZ over this region.
    • Over the west coast the dry spells are associated with days when winds blow parallel to the coast.

    Withdrawal of Monsoon

    • By August the intensity and duration of sunshine have decreased, temperatures begin to fall, and the surge of south-westerly air diminishes spasmodically almost to a standstill in the northwest.
    • In September, dry, cool, northerly air begins to circle the west side of the highlands and spread over north-western India.
    • The easterly jet weakens, and the upper tropospheric easterlies move much farther south.
    • Because the moist southwesterlies at lower levels are much weaker and variable, they are soon pushed back.
    • The rainfall becomes extremely variable over most of the region, but showers are still frequent in the south-eastern areas and over the Bay of Bengal.
    • By early October, variable winds are very frequent everywhere.

    Winter rains

    • At the end of the month, the entire Indian region is covered by northerly air and the winter monsoon takes shape.
    • The surface flow is deflected by the Coriolis force and becomes a north-easterly flow.
    • Tropical depressions and cyclones are important contributing factors.
    • Most of India thus begins a sunny, dry, and dusty season.
    • Conversely, the western slopes of the Karakoram Range and Himalayas are then reached by the midlatitude frontal depressions that come from the Atlantic and the Mediterranean.
    • The winter rains they receive, moderate as they are, place them clearly outside the monsoonal realm.

     

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  • Cyclone Gulab

    As a very rare occasion during monsoons, Cyclone Gulab has been developed in the Bay of Bengal and later made landfall close in Andhra Pradesh.

    Tauktae, Amphan, Fani, Titli, Bulbul, Gaja… And now Gulab. As and when cyclones with intriguing names approach the Indian coasts, a common question comes to our minds: Who names these storms?

     

    This time it is Pakistan, not India, who proposed this name Gulaab!

    About Tropical Cyclones

    • A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure centre, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rains.
    • Depending on its location and strength, a tropical cyclone is referred to by different names, including hurricane, typhoon, tropical storm, cyclonic storm, tropical depression, or simply cyclone.
    • A hurricane is a tropical cyclone that occurs in the Atlantic Ocean and the northeastern Pacific Ocean, and a typhoon occurs in the north-western Pacific Ocean.
    • In the south Pacific or the Indian Ocean, comparable storms are referred to simply as “tropical cyclones” or “severe cyclonic storms”.

    Cyclone Gulab

    • Three factors —in-sync phase of Madden Julian Oscillation (MJO), warm sea surface temperatures over the Bay of Bengal, and the formation of a low-pressure system.
    • The system’s intensification phases between low pressure – well-marked low pressure – depression – deep depression and to finally becoming Cyclone Gulab was rather rapid, even as the system moved closer to the south Odisha – north Andhra Pradesh coast, where it also made landfall.

    What makes Gulab special?

    • India has a bi-annual cyclone season that occurs between March to May and October to December. But on rare occasions, cyclones do occur in June and September months.
    • Cyclones are less common during the June to September monsoon season, as there are limited or almost no favourable conditions for cyclogenesis due to strong monsoon currents.
    • This is also the period when the wind shear — that is, the difference between wind speeds at lower and upper atmospheric levels — is very high.
    • As a result, clouds do not grow vertically and monsoon depressions often fail to intensify into cyclones.
    • So it can be stated that this year, the cyclone season commenced earlier than usual. The last time a cyclone developed in the Bay of Bengal in September was Cyclone Day in 2018.

    Also read

    [Burning Issue] Tropical Cyclones and India

     

     

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  • Dinosaur Footprints found in Thar desert

    In a major discovery, footprints of three species of dinosaurs have been found in the Thar desert in Rajasthan’s Jaisalmer district.

    Details of the footprints

    • The footprints, made in the sediment or silt of the seashore, later become permanently stone-like.
    • They belong to three species of dinosaurs — Eubrontes cf. giganteus, Eubrontes glenrosensis and Grallator tenuis.
    • While the giganteus and glenrosensis species have 35 cm footprints, the footprint of the third species was found to be 5.5 cm.
    • The dinosaur species are considered to be of the theropod type, with the distinguishing features of hollow bones and feet with three digits.
    • All three species, belonging to the early Jurassic period, were carnivorous.
    • Eubrontes could have been 12 to 15 metres long and weighed between 500 kg and 700 kg, while the height of the Grallator is estimated to have been two metres, as much as a human, with a length of up to three metres.

    Key findings

    • The discovery of dinosaur footprints prove the presence of the giant reptiles in the western part of the State, which formed the seashore to the Tethys Ocean during the Mesozoic era.
    • Careful geological observations enabled the scientists to interpret ancient environments in which the rocks of the footprints, which were once soft sediments, were deposited.
    • Geochemical analyses and calculation of weathering indices showed that the hinterland climate was seasonal to semi-arid during the deposition of the footprints.
    • Fieldwork in the Kutch and Jaisalmer basins has suggested that after the main transgression during the early Jurassic period, the sea level changed several times.
    • Spatial and temporal distribution of sediments and traces of fossils and post-depositional structures provided an indication to this phenomenon.

    Significance

    • These trace fossils are significant to ascertain how life started and evolved after the mass extinction of species, including dinosaurs, at the end of the cretaceous period around 65 million years ago.
    • This research also illustrates the evidence of a fluvial freshwater palaeo-environment and tropical palaeo-climate, indicating the presence of a tropical forest and a huge network of rivers.

    No matter what, try this PYQ:

    Q.The term “sixth mass extinction/sixth extinction” is often mentioned in the news in the context of the discussion of (CSP 2018):

    (a) Widespread monoculture Practices agriculture and large-scale commercial farming with indiscriminate use of chemicals in many parts of the world that may result in the loss of good native ecosystems.

    (b) Fears of a possible collision of a meteorite with the Earth in the near future in the manner it happened 65million years ago that caused the mass extinction of many species including those of dinosaurs.

    (c) Large scale cultivation of genetically modified crops in many parts of the world and promoting their cultivation in other Parts of the world which may cause the disappearance of good native crop plants and the loss of food biodiversity.

    (d) Mankind’s over-exploitation/misuse of natural resources, fragmentation/loss, natural habitats, destruction of ecosystems, pollution, and global climate change.

     

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  • Hurricane Ida makes landfall in US

    Hurricane Ida has made landfall in Louisiana, US as an extremely dangerous Category 4 storm.

    What is a Hurricane?

    • A hurricane is a tropical cyclone that occurs in the Atlantic Ocean and the northeastern Pacific Ocean.
    • And a typhoon occurs in the northwestern Pacific Ocean; in the south Pacific or the Indian Ocean, comparable storms are referred to simply as “tropical cyclones” or “severe cyclonic storms”.

    What are Tropical Cyclones?

    A Tropical cyclone is an intense circular storm that originates over warm tropical oceans and is characterized by low atmospheric pressure, high winds, and heavy rain.

    • Cyclones are formed over slightly warm ocean waters. The temperature of the top layer of the sea, up to a depth of about 60 meters, need to be at least 28°C to support the formation of a cyclone.
    • This explains why the April-May and October-December periods are conducive for cyclones.
    • Then, the low level of air above the waters needs to have an ‘anticlockwise’ rotation (in the northern hemisphere; clockwise in the southern hemisphere).
    • During these periods, there is an ITCZ in the Bay of Bengal whose southern boundary experiences winds from west to east, while the northern boundary has winds flowing east to west.
    • Once formed, cyclones in this area usually move northwest. As it travels over the sea, the cyclone gathers more moist air from the warm sea which adds to its heft.

    Try this question from CSP 2020:

    Q.Consider the following statements:

    1. Jet Streams occur in the Northern Hemisphere only.
    2. Only some cyclones develop an eye.
    3. The temperature inside the eye of a cyclone is nearly 10 degree Celsius lesser than that of the surroundings.

    Which of the statements given above is/are correct?

    (a) 1 only

    (b) 2 and 3 only

    (c) 2 only

    (d) 1 and 3 only

     

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    Destruction caused

    • Strong Winds: Cyclones are known to cause severe damage to infrastructure through high-speed winds.
    • Torrential rains and inland flooding: Torrential rainfall (more than 30 cm/hour) associated with cyclones is another major cause of damages. Unabated rain gives rise to unprecedented floods.
    • Storm Surge: A Storm surge can be defined as an abnormal rise of sea level near the coast caused by a severe tropical cyclone.

    Some (unexpected) benefits

    Although Tropical cyclones are known for the destruction they cause, when they strike they also bestow certain benefits to the climatic conditions of that area such as

    • Relieve drought conditions
    • Carry heat and energy away from the tropics and transport it towards temperate latitudes
    • Maintain a relatively stable and warm temperature worldwide

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    Also read:

    [Burning Issue] Tropical Cyclones and India

  • Hawaii’s Kilauea Volcano

    Geologists have detected a swarm of earthquakes at Hawaii’s Kilauea volcano, though it was not erupting.

    Kilauea Volcano

    • Kilauea is about 200 miles south of Honolulu, on the Big Island of Hawaii.
    • It is one of the world’s most active volcanoes, having erupted 34 times since 1952. In Hawaiian tradition, Kilauea is home to the volcano goddess Pele.
    • From 1983 to 2018, it erupted almost continuously, in some cases sending streams of lava that covered farms and homes.
    • At the end of this decades-long eruption, Kilauea spewed lava from vents in a residential neighborhood on its eastern flank and destroyed more than 700 homes.
    • In December, Kilauea erupted at the crater, creating a lake with enough lava to fill 10 Hoover dams. That eruption ended in May.

    Do not skip answering this PYQ:

    Consider the following statements:

    1. The Barren Island volcano is an active volcano located in the Indian Territory.
    2. Barren Island lies about 140 km east of Great Nicobar.
    3. The last time the Barren Island volcano erupted was in 1991 and it has remained inactive since then.

    Which of the statements given above is/are correct? (CSP 2014)

    (a) 1 only

    (b) 2 and 3 only

    (c) 3 only

    (d) 1 and 3 only

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    Back2Basics: Volcanic Landforms

    • Note the intrinsic and extrinsic types of volcanic landforms

    • A volcano has 3 main characteristics
    1. Cone shaped mountain
    2. Formed by rock or ash thrown from the inside of the earth
    3. At times, opening or depression at top
    • The three main types of volcanos are:

    1. Cinder cone Volcano: The cinder cones are small volcanoes with steep sides. Even though they are small, these are the ones you probably hear about.  They are very explosive and made of ash and rock.  Most of the cinder cones are small and less than 500 meters high.  A famous cinder cone is Sunset Crater Volcano in Arizona.
    2. Shield Volcanoes: A shield is a low and broad volcano that usually has a very wide crater (a dent in the Earth’s surface). It is formed from thin layers of lava after consistent low-grade eruptions.  The largest volcano in the world is a shield volcano.  It is located in Hawaii.
    3. Composite volcanoes: They are the tallest type of volcano. They look very impressive but do usually have quiet and slow lava flows.  They sometimes have small eruptions that cause ash and rock to go flying.  One of the most famous volcanoes in the world is a composite volcano.  It is Mount Fuji in Japan.

  • Issues in India’s Cyclone Management

    Context

    The severe cyclones, Tauktae and Yaas, battered India earlier this year. With a rise in the frequency of devastating cyclones, India needs to look at long-term mitigation measures.

    India’s vulnerability

    • The Indian coastline is around 7,500 km; there are 96 coastal districts (which touch the coast or are close to it), with 262 million people exposed to cyclones and tsunamis.
    • The World Bank and the United Nations (2010) estimate that around 200 million city residents would be exposed to storms and earthquakes by 2050 in India.
    • Between 1891 and 2020, out of the 313 cyclones crossing India’s eastern and western coasts, the west coast experienced 31 cyclones, while 282 cyclones crossed the east coast.
    • Among the natural disasters, cyclones constituted the second most frequent phenomena that occurred in 15% of India’s total natural disasters over 1999-2020.
    • According to the Global Climate Risk Index report 2021, India ranks the seventh worst-hit country globally in 2019 due to the frequent occurrence of extreme weather-related events.
    • Increase in frequency: According to India Meteorological Department (IMD), 2013 data frequency of cyclones in the coastal States accounting increased by 7%.
    • Factor’s responsible: Increasing sea surface temperatures in the northern Indian Ocean and the geo-climatic conditions in India are the factors responsible for the increase in frequency.

    Economic cost

    • Between 1999 and 2020, cyclones inflicted substantial damage to public and private properties, amounting to an increase in losses from $2,990 million to $14,920 million in the absence of long-term mitigation measures.
    • India lost around 2% of GDP and 15% of total revenue over 1999-2020.
    • Between 1999-2020, around 12,388 people were killed, and the damage was estimated at $32,615 million.
    • Cyclones are the second most expensive in terms of the costs incurred in damage, accounting for 29% of the total disaster-related damages after floods (62%).
    • In addition, they are the third most lethal disaster in India after earthquakes (42%) and floods (33%).

    Odisha model

    • In the aftermath of the 1999 super cyclone, the Government of Odisha took up various cyclone mitigation measures.
    • These included installing a disaster warning system in the coastal districts, and construction of evacuation shelters in cyclone-prone districts.
    • Other steps were the setting up of the Odisha State Disaster Management Authority (OSDMA), conducting regular cabinet meetings for disaster preparedness, and building the Odisha Disaster Rapid Action Force (ODRAF).

    Way forward

    • Still, Odisha’s disaster management model is inadequate to minimise the economic losses that result from cyclones.
    • Therefore, the Government of India should adopt a few measures to minimise disaster damage and fatalities.
    • Improve warning system: It is imperative to improve the cyclone warning system and revamp disaster preparedness measures.
    • Increase cover under shelterbelt plantation: The Government must widen the cover under shelterbelt plantations and help regenerate mangroves in coastal regions to lessen the impact of cyclones.
    • In addition, adopting cost-effective, long-term mitigation measures, including building cyclone-resilient infrastructure such as constructing storm surge-resilient embankments, canals and improving river connectivity to prevent waterlogging in low-lying areas are important.
    • Disaster resilient power infrastructure: installing disaster-resilient power infrastructure in the coastal districts, providing concrete houses to poor and vulnerable households, and creating massive community awareness campaigns are essential.
    • Coordination between Centre-State: Healthy coordination between the Centre and the States concerned is essential to collectively design disaster mitigation measures.
    • Collective mitigation effort by the Centre and States that can help reduce the fiscal burden of States and also be effective in minimising disaster deaths.

    Conclusion

    Long term mitigation measures are essential to minimise the impact of the disasters such as cyclones.

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  • Declaring a National Calamity

    Under the existing Scheme of State Disaster Response Fund / National Response Fund of the Ministry of Home Affairs, there is no provision to declare any disaster including flood as a National Calamity.

    How does the law define a disaster?

    • A natural disaster includes earthquake, flood, landslide, cyclone, tsunami, urban flood, heatwave; a man-made disaster can be nuclear, biological and chemical.
    • As per the Disaster Management Act, 2005, “disaster” means:
    1. A catastrophe, mishap, calamity or grave occurrence in any area, arising from natural or man-made causes, or
    2. It results in substantial loss of life or human suffering or damage to, and destruction of, property, or damage to, or degradation of, environment, and
    3. Damage is of such a nature or magnitude as to be beyond the coping capacity of the community of the affected area.

    How can any of these be classified as a national disaster?

    • There is no provision, executive or legal, to declare a natural calamity as a national calamity.
    • The existing guidelines of the State Disaster Response Fund (SDRF)/ National Disaster Response Fund (NDRF), do not contemplate declaring a disaster as a National Calamity.

    Has there ever been an attempt to define a national calamity?

    • In 2001, the National Committee under the chairmanship of the then PM was mandated to look into the parameters that should define a national calamity.
    • However, the committee did not suggest any fixed criterion.

    How, then, does the government classify disasters/calamities?

    • The 10th Finance Commission (1995-2000) examined a proposal that a disaster be termed “a national calamity of rarest severity” if it affects one-third of the population of a state.
    • The panel did not define a “calamity of rare severity” but stated that a calamity of rare severity would necessarily have to be adjudged on a case-to-case basis taking into account.

    What happens if a calamity is so declared?

    • When a calamity is declared to be of “rare severity/severe nature”, support to the state government is provided at the national level.
    • The Centre also considers additional assistance from the NDRF.
    • A Calamity Relief Fund (CRF) is set up, with the corpus shared 3:1 between Centre and state.
    • When resources in the CRF are inadequate, additional assistance is considered from the National Calamity Contingency Fund (NCCF), funded 100% by the Centre.
    • Relief in repayment of loans or for grant of fresh loans to the persons affected on concessional terms, too, are considered once a calamity is declared “severe”.

  • Why cloudbursts could become more frequent?

    Recently, cloudbursts have been reported from several places in J&K, Ladakh, Uttarakhand and Himachal Pradesh. A

    What is a Cloudburst?

    • Cloudbursts are short-duration, intense rainfall events over a small area.
    • According to the IMD, it is a weather phenomenon with unexpected precipitation exceeding 100mm/h over a geographical region of approximately 20-30 square km.

    What causes Cloudburst?

    • A study published last year studied the meteorological factors behind the cloudburst over the Kedarnath region.
    • They analyzed atmospheric pressure, temperature, rainfall, cloud water content, cloud fraction, cloud particle radius, cloud mixing ratio, total cloud cover, wind speed, wind direction, and relative humidity during the cloudburst, before as well as after the cloudburst.
    • The results showed that during the cloudburst, the relative humidity and cloud cover was at the maximum level with low temperature and slow winds.
    • It is expected that because of this situation a high amount of clouds may get condensed at a very rapid rate and result in a cloudburst.

    Impact of climate change

    • Several studies have shown that climate change will increase the frequency and intensity of cloudbursts in many cities across the globe.
    • As temperatures increase the atmosphere can hold more and more moisture and this moisture comes down as a short very intense rainfall for a short duration.
    • This results in flash floods in the mountainous areas and urban floods in the cities.
    • Also, there is evidence suggesting that globally short duration rainfall extremes are going to become more intense and frequent.

    Answer this PYQ in the comment box:

    Q.During a thunderstorm, the thunder in the skies is produced by the:

    1. meeting of cumulonimbus clouds in the sky
    2. lightning that separates the nimbus clouds
    3. violent upward movement of air and water particles

    Select the correct option using the codes given below:

    (a) 1 only

    (b) 2 and 3 only

    (c) 1 and 3 only

    (d) None of the above

  • How the Moon ‘Wobble’ affects rising tides

    US coastlines will face increasing flooding in the mid-2030s due to a regular lunar cycle called the wobble effect that will magnify rising sea levels caused by climate change.

    What is the Moon Wobble?

    • The moon wobble is nothing but a regular swaying in the moon’s orbit.
    • It was first documented way back in 1728.
    • This wobble takes over an 18.6-year period to complete and continues in a cyclic fashion.

    How does this wobble occur?

    • High tides on this planet are caused mostly by the pull of the moon’s gravity on a spinning Earth. On most beaches, you would see two high tides every 24 hours.
    • The moon also revolves around the Earth about once a month, and that orbit is a little bit tilted.
    • moon’s orbital plane around the Earth is at an approximate 5-degree incline to the Earth’s orbital plane around the sun.
    • Because of that, the path of the moon’s orbit seems to fluctuate over time, completing a full cycle — sometimes referred to as a nodal cycle — every 18.6 years.
    • At certain points along the cycle, the moon’s gravitational pull comes from such an angle that it yanks one of the day’s two high tides a little bit higher, at the expense of the other.
    • This does not mean that the moon itself is wobbling, nor that its gravity is necessarily pulling at our oceans any more or less than usual.

    What impact does this wobble have on Earth?

    • Influences the ebb and flow of tides: The moon wobbles impacts the gravitational pull of the moon, and therefore, indirectly influences the ebb and flow of tides here on the Earth.
    • One half of the 18.6-year cycle suppresses the tides, which means that the high tides get lower, while the low tides get higher than normal.
    • Once this cycle completes, the situation flips—in the subsequent cycle, the tides are amplified, with high tides getting higher and low tides, lower.
    • The lunar cycle is expected to shift again by mid-2030, and in the coming phase, the tides will amplify once again.

    Moon wobble and climate change

    • The upcoming changes in the lunar cycle will pose a serious threat, as the amplified high tides coupled with the rising sea levels will make the risk of flooding far greater across all coastal regions of the globe.
    • The study predicts that the high tide-associated floods—also known as nuisance floods or sunny day floods—may occur in clusters that could last for months or even for longer periods!
    • This surge will be closely associated with the position of the Moon, Earth and the Sun.
    • When the Moon and Earth line up in specific ways with each other and the Sun, the resulting gravitational pull and the ocean’s corresponding response may leave city-dwellers coping with floods every day or two.

  • Graded Response Action Plan (GRAP)

    Fearing any surge in coronavirus cases in the national capital, which is witnessing a decline in cases of infection, the Delhi government has chalked out the ‘Graded Response Action Plan (GRAP).’

    Graded Response Action Plan (GRAP)

    • In 2014, when a study by the WHO found that Delhi was the most polluted city in the world, panic spread in the Centre and the state government.
    • Approved by the Supreme Court in 2016, the plan was formulated after several meetings that the Environment Pollution (Prevention and Control) Authority (EPCA) held with state government and experts.
    • The result was a plan that institutionalized measures to be taken when air quality deteriorates.
    • GRAP also works as an emergency measure.
    • It includes strict measures such as a ban on the entry of heavy vehicles, the odd-even road rationing restrictions, and a halt of construction work – each of which is likely to be impractical at a time when the pandemic has exacted heavy economic costs and public transport has been seen as an infection risk.

    For covid purposes

    • This time, it was decided to notify the GRAP that will “objectively and transparently” ensure an “institutional and automatic” response with regards to enforcement measures, lockdowns and unlock activities.
    • The plan was prepared in comparison with ascent data of the four waves at specific positivity rates of 0.5%, 1%, 2% and 5% and also considered on the basis of the earlier four waves.