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GS Paper: GS1-14.Important Geophysical phenomena such as earthquakes, Tsunami, Volcanic activity, cyclone etc.,

  • Climate Change Performance Index (CCPI) 2020

    India ranked high along with the European Union and the United Kingdom in the latest edition of the Climate Change Performance Index (CCPI) 2020 released by non-profit Germanwatch.

    It’s a very rare feat that India has performed so better in any climate-related index. We can use this data to highlight India’s dedicated efforts for Paris Agreement.

    Climate Change Performance Index (CCPI)

    • The CCPI is an independent monitoring tool for tracking countries’ climate protection performance. It has been published annually since 2005.
    • It evaluates 57 countries and the European Union, which together generate 90%+ of global greenhouse gas emissions.
    • Using standardised criteria, the CCPI looks at four categories, with 14 indicators: Greenhouse Gas Emissions (40% of the overall score), Renewable Energy (20%), Energy Use (20%), and Climate Policy (20%).
    • The CCPI’s unique climate policy section evaluates countries’ progress in implementing policies working towards achieving the Paris Agreement goals.

    Global scenario

    • No country was doing enough to meet the goals of the 2015 Paris Agreement, according to the index.
    • Six G20 countries were ranked among very low performers. The United States, with a rank of 61, was the worst performer.

    India’s performance

    • India, for the second time in a row, continued to remain in the top 10. The country scored 63.98 points out of 100.
    • It received high ratings on all CCPI indicators except ‘renewable energy’, where it was categorised as having a ‘medium’ performance.
    • Last year, India had been ranked at the ninth position, with an overall score of 66.02.
    • India needed to focus more on renewable energy, both, as a mitigation strategy and for its post-novel coronavirus disease (COVID-19) green recovery, the report said.

    Renewable energy

    • No country was rated very high on indicators defining the ‘renewable energy’ category.
    • India has been ranked at 27th out of 57 countries under the category this time. Last year, it was ranked at 26th.
    • India’s performance has been rated as ‘medium’ for its current share of renewable energy. Its performance for the development of renewable energy supply during the last year was rated as ‘high’.

    A positive sign for India

    • India’s improved policy framework has been responsible for the country’s good performance in this global index. However, the report underlined the need for long-term planning.
    • Unlike the other two ‘BASIC’ countries of China and South Africa, India is yet to announce its mitigation strategy.

  • Species in news: Red Sea Turtles

    Turtle populations in the Red Sea could be turning overwhelmingly female because of a rise in sea temperatures caused due to anthropogenic climate change, a new study has showed.

    Try this PYQ:

    Q.Consider the following fauna of India:

    1. Gharial
    2. Leatherback turtle
    3. Swamp deer

    Which of the above is/are endangered?

    (a) 1 and 2 only

    (b) 3 only

    (c) 1, 2 and 3

    (d) None

    Red Sea Turtles

    • There are seven extant species worldwide, five of which can be found in the Red Sea: the green turtle, the hawksbill turtle, the loggerhead turtle, the olive ridley turtle and the leatherback turtle.
    • In order to maintain a 50:50 ratio of male and female in the population, a temperature of 29.2 degrees Celsius is pivotal.
    • Above this, hatchlings would be predominantly female.
    • The sand temperatures at four of the sites exceeded 29.2 degrees; leading the team to the conclusion that ‘feminization’ of the population could be already happening.

    Their significance

    • Marine turtles—as all top predators—have a prominent role in maintaining balanced and healthy ecosystems, in particular seagrass beds and coral reefs.
    • They also help in transporting nutrients towards naturally nutrient-poor ecosystems (the nesting beaches), and providing food and transportation for other marine species (e.g., barnacles and commensal crabs).
    • Marine turtles also play an important role in the economy of the tourism industry.

  • Sea sparkle: Bloom of Noctiluca Scintillans

    The blooms of Noctiluca Scintillans, commonly known as “sea sparkle” are being witnessed along the coasts of Maharashtra and Karnataka.

    A stand-alone species being mentioned in the news for the first time find their way into the prelims. Note this down.

    Noctiluca Scintillans

    • Scintillans is a bioluminescent specie that brightens the seawater during the night.
    • It grazes on other micro-organisms such as larvae, fish eggs, and diatoms. But the unicellular phytoplankton that lives inside it can photosynthesize, turning sunlight into energy.
    • They help their host cell survive even when food was scarce.
    • Thus, N. Scintillans acts as both a plant and an animal

    Threats posed

    • According to marine experts, the phenomenon is an indicator of climate change.
    • While smaller blooms may be harmless, slow-moving larger blooms may have an impact on deep-sea fishes.
    • The toxic blooms of N. Scintillans were linked to massive fish and marine invertebrate kills.
    • Though the species does not produce a toxin, it was found to accumulate toxic levels of ammonia, which is then excreted into the surrounding waters, possibly acting as the killing agent in blooms.
    • They have displaced microscopic algae called diatoms, which form the basis of the marine food chain. This has deprived food for the planktivorous fish.

    Back2Basics: Bioluminescence

    • It is the property of a living organism to produce and emit light.
    • Animals, plants, fungi and bacteria show bioluminescence. A remarkable diversity of marine animals and microbes are able to produce their own light.
    • It is found in many marine organisms such as bacteria, algae, jellyfish, worms, crustaceans, sea stars, fish and sharks.
    • Luminescence is generally higher in deep-living and planktonic organisms than in shallow species.

  • Glacial Lake Outburst in Ladakh

    In August 2014, a glacial lake outburst flood (GLOF) hit the village of Gya in Ladakh, destroying houses, fields and bridges. Researchers now have mapped the evolution of Gya glacial lake and note the cause of the flood.

    What is glacial lake outburst flood?

    • A GLOF is a type of outburst flood that occurs when the dam containing a glacial lake fails.
    • An event similar to a GLOF, where a body of water contained by a glacier melts or overflows the glacier, is called a Jökulhlaup.
    • The dam can consist of glacier ice or a terminal moraine.
    • Failure can happen due to erosion, a buildup of water pressure, an avalanche of rock or heavy snow, an earthquake, volcanic eruptions under the ice, or glacier collapses into it.

     How did it happen in Ladakh?

    • It was not a spillover but rather a tunnelling of drainage process that caused GLOF in Gya lake.
    • Imagine a bucket full of water. It can overflow when you drop a stone, or the water can drain if there is a hole under the bucket.
    • Similarly, here the flooding did not happen due to the spillovers due to an avalanche or landslide, rather there was a thawing of the ice cores in the moraine.

    Back2Basics: Glacial Landforms

    Glacial landforms are landforms created by the action of glacier movements.

    As the glaciers expand, due to their accumulating weight of snow and ice they crush and abrade and scour surfaces such as rocks and bedrock.  The resulting erosional landforms include striations, cirques, glacial horns, arêtes, trim lines, U-shaped valleys, over-deepening and hanging valleys.

    • Cirque: Starting location for mountain glaciers
    • Cirque stairway: a sequence of cirques
    • U-shaped, or trough, valley: U-shaped valleys are created by mountain glaciers. When filled with ocean water so as to create anthe glacial action erodes through, a spillway (or col) forms
    • Valley step: an abrupt change in the longitudinal slope of a glacial valley

    When the glaciers retreated leaving behind their freight of crushed rock and sand (glacial drift), they created characteristic depositional landforms.  Examples include glacial moraines, eskers, and kames. Drumlins and ribbed moraines are also landforms left behind by retreating glaciers.

    • Esker: Built-up bed of a subglacial stream
    • Kame: Irregularly shaped mound
    • Moraine: Feature can be terminal (at the end of a glacier), lateral (along the sides of a glacier), or medial (formed by the merger of lateral moraines from contributary glaciers)
    • Outwash fan: Braided stream flowing from the front end of a glacier

  • Brown Carbon ‘Tarballs’

    A study has highlighted that brown carbon ‘tarballs’ that fasten the glacial melting has been found in the Himalayan atmosphere.

    We are still to find a solution for the ill-fated Delhi air,  and here comes another blow from the stubble burnings.

    What are Brown Carbon ‘Tarballs’?

    • Tarballs are small light-absorbing, carbonaceous particles formed due to burning of biomass or fossil fuels that deposit on snow and ice.
    • They are formed from brown carbon, emitted during the burning of fossil fuels.
    • The median sizes of externally mixed tarballs and internally mixed tarballs were 213 and 348 nanometre respectively.
    • Primary brown carbon (BrC) co-emitted with black carbon (BC) from biomass burning is an important light-absorbing carbonaceous aerosol.
    • The black carbon from the Indo-Gangetic Plain can reach the Himalaya region and influence glacial melting and climatic change.

    Highlights of the study

    • Until now, black carbon was found to be transported long distances by the wind to the Himalayan atmosphere.
    • The study revealed that a dense array of active fire spots — corresponding to large-scale wheat-residue burning on the Indo-Gangetic Plain — occurred along the pathways of Himalaya.
    • The percentage of the tarballs increased on days of higher levels of pollution and could contribute to the hastening of glacial melt and global warming.
    • The researchers concluded that tarballs from long-range transport can be an important factor in the climatic effect and would correspond to a substantial influence on glacial melting in the Himalaya region.

  • In news: Great Barrier Reef

    Australian scientists have found a detached coral reef on the Great Barrier Reef that exceeds the height of the Empire State Building and the Eiffel Tower.

    Try this PYQ:

    Q.Consider the following statements:

    1. Most of the world’s coral reefs are in tropical waters.
    2. More than one-third of the world’s coral reefs are located in the territories of Australia, Indonesia and the Philippines.
    3. Coral reefs host far more number of animal phyla than those hosted by tropical rainforests.

    Which of the above statements is/are correct?

    (a) 1 and 2 only

    (b) 3 only

    (c) 1 and 3 only

    (d) 1 and 3 only

    About Great Barrier Reef

    • The Great Barrier Reef is the world’s largest coral reef system composed of over 2,900 individual reefs and 900 islands.
    • It is stretched for over 2,300 kilometres over an area of approximately 344,400 square kilometres.
    • The reef is located in the Coral Sea, off the coast of Queensland, Australia.
    • It was world heritage listed in 1981 by UNESCO as the most extensive and spectacular coral reef ecosystem on the planet.

    Why it is significant?

    • This is first such discovery in over 100 years.
    • The “blade-like” reef is nearly 500 metres tall and 1.5 kilometres wide.
    • It lies 40 metres below the ocean surface and about six kilometres from the edge of the Great Barrier Reef.

    Tap to read more about:

  • What is Atlantification?

    Scientists have uncovered “hotspots” where some parts of the Barents Sea are starting to more closely resemble the Atlantic. They call this phenomenon “Atlantification”.

    Try this MCQ:

    Q.The Atlantification phenomenon sometimes seen in news is most closely related to which of the following seas/water bodies?

    a) Norwegian Sea

    b) Kara Sea

    c) Barents Sea

    d) Baffin Bay

    What is Atlantification?

    • Streams of warmer water from the Atlantic Ocean flow into the Arctic at the Barents Sea.
    • This warmer, saltier Atlantic water is usually fairly deep under the more buoyant Arctic water at the surface.
    • Lately, however, the Atlantic water has been creeping up. That heat in the Atlantic water is helping to keep ice from forming and melting existing sea ice from below.
    • This process is called “Atlantification”.
    • The ice is now getting hit both from the top by a warming atmosphere and at the bottom by a warming ocean.

    Reasons for it

    • In the background of all of this is global climate change.
    • The Arctic sea ice extent and thickness have been dropping for decades as global temperatures rise.
    • As the Arctic loses ice and the ocean absorbs more solar radiation, global warming is amplified.
    • That affects ocean circulation, weather patterns and Arctic ecosystems spanning the food chain, from phytoplankton all the way to top predators.

  • Global Nitrous Oxide Pollution

    Human emissions of nitrous oxide (N2O) — a greenhouse gas 300 times more potent than carbon dioxide (CO2) — increased by 30 per cent between 1980 and 2016.

    Observe the above image carefully and try to find out the major contributor of nitrous oxide emission in the Global N2O Budget.

    What is Nitrous oxide?

    • Nitrous oxide is a dangerous gas for the sustainable existence of humans on Earth.
    • It has the third-highest concentration — after CO2 and methane — in our atmosphere among greenhouse gases responsible for global warming.
    • N2O can live in the atmosphere for up to 125 years.
    • Most N2O emissions have come from emerging countries like India, China and Brazil.

    About the research

    • Nitrous oxide global concentration levels have increased from 270 parts per billion (ppb) in 1750 to 331 ppb in 2018 — a jump of 20 per cent.
    • The growth has been the quickest in the past five decades because of human emissions.
    • The research was conducted through an international collaboration between the International Nitrogen Initiative (INI) and the Global Carbon Project of Future Earth, a partner of the World Climate Research Programme.

    Why N2O matters?

    • N2O is also the only remaining threat to the ozone layer, for it accumulates in the atmosphere over a long period of time, just like CO2.
    • The increase in its emissions means that the climatic burden on the atmosphere is increasing from non-carbon sources as well, while the major focus of global climate change negotiations is currently centred on carbon.
    • A major proportion of the N2O emissions in the last four decades came from the agricultural sector, mainly because of the use of nitrogen-based fertilizers.
    • The growing demand for food and feed for animals will further increase global nitrous oxide emissions.

  • What is Global Warming Hiatus (GWH)?

    A new study on variability in the Mascarene High (MH) in the Southern Indian Ocean during global warming hiatus (GWH) has revealed that the region experienced significantly increased sea surface temperature (SST) during this period (1998-2016).

    Try this PYQ:

    Q.With reference to Ocean Mean Temperature (OMT), which of the following statements is/are correct? (CSP 2020)

    1. OMT is measured upto a depth of 26 degree Celsius isotherm which is 129 meters in the south-western Indian Ocean during January-March.
    2. OMT collected during January-March can be used in assessing whether the amount of rainfall in monsoon will be less or more than a certain long-term mean.

    Select the correct answer using the code given below:
    (a) 1 only
    (b) 2 only
    (c) Both 1 and 2
    (d) Neither 1 nor 2

    What is Global Warming Hiatus (GWH)?

    • A global warming hiatus is referred to a global warming pause, or a global warming slowdown, which is a period of relatively little change in globally averaged surface temperatures.
    • The hiatus, however, can result in an increase in the SST.

    What is Mascarene High (MH)?

    • The Mascarene High (MH) is a semi-permanent subtropical high-pressure zone in the South Indian Ocean.
    • It is also called the Indian Ocean subtropical high, which is a high-pressure area located between 20° to 35° South latitude and 40° to 90° East longitude.
    • It is a region from where the cross-equatorial winds blow to India.
    • It has been named after the Mascarene Islands, in the Indian Ocean east of Madagascar consisting of the islands belonging to Mauritius as well as the French Réunion Islands.
    • Apart from its large influence on African and Australian weather patterns, it also helps in driving the inter-hemispheric circulation between the Indian Ocean in the south and subcontinental landmass in the north.

    Role of MH

    • The warming in SST due to global warming has resulted in a decrease in the pressure gradient between the MH and the Indian landmass.
    • This in turn suppressed the intensity of low-level cross-equatorial winds over the western Indian Ocean affecting the onset of the monsoon over the Indian subcontinent and rainfall over East Asia.

  • [pib] Climate Smart Cities Assessment Framework (CSCAF 2.0)

    The Ministry of Housing and Urban Affairs has launched the Climate Smart Cities Assessment Framework (CSCAF) 2.0.

    About CSCAF 2.0

    • A framework is a climate-sensitive approach to urban planning and development in India.
    • ​It was developed after a review of existing frameworks and assessment approaches adopted throughout the world.
    • It followed a series of an extensive consultative process with more than 26 organizations and 60 experts from different thematic areas.
    • The Climate Centre for Cities under National Institute of Urban Affairs (NIUA) is supporting MoHUA in implementation of CSCAF.

    Various indicators of the framework

    The framework has 28 indicators across five categories namely:

    1. Energy and Green Buildings
    2. Urban Planning, Green Cover & Biodiversity
    3. Mobility and Air Quality
    4. Water Management
    5. Waste Management