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Subject: Environment

  • Chunk of India’s forests ‘missing’ after 27-year-delay to file reports | Analysis

    Why in the news?

    SC ordered MoEFCC to upload State Expert Committee reports on unclassed forests due to concerns over the Forest (Conservation) Act Amendment 2023 constitutionality, impacting protection and potential diversion of these forests.

    What are unclassed forests?

    • Unclassed forests, also known as deemed forests, are forest areas that may belong to various entities such as government bodies (forests, revenue departments, railways), communities, or private owners. However, these forest areas have not been officially notified as forests.
    • The State Expert Committees (SECs) were tasked with identifying all such unclassed forests across the country (referring to Forest Working Plans and Land Revenue Records).
    • Additionally, SECs were required to physically identify any land patches that exhibit characteristics of forests, as per the dictionary meaning of forests, irrespective of their ownership status.

    What are the present issues?

    1. The missing forests in SECs 
    • Undermined the previous judgment: MoEFCC informed a Parliamentary Committee that SECs had identified unclassed forests, aligning with the proposed Forest (Conservation) Act Amendment, despite earlier criticism that the law undermined the Godavarman judgment.
      • However, an RTI application revealed that MoEFCC claimed not to have the SEC reports, raising questions about its assurance to the Parliamentary Committee.
    • Lack of verified data: Following a Supreme Court order, MoEFCC uploaded the SEC reports, but they showed a lack of verifiable data on the identification, status, and location of unclassed forests.
    • States not constituted SECs: Seven states and Union Territories, including Goa, Haryana, and Tamil Nadu, hadn’t constituted SECs, while others hadn’t fully complied with Supreme Court directives.
    • Non-traceable Forest: Ladakh formed an SEC only after the dissolution of Jammu & Kashmir, and Puducherry’s report was declared “not traceable”, further highlighting inconsistencies in the process.
    1. Disagreement with FSI data 
    • Insufficient timeline: Many states argue that the one-month timeline provided by the Supreme Court was insufficient for comprehensive work due to the voluminous nature of the task.
    • Relied on Existing data: Instead of conducting ground-truthing, physical cadastral surveys, and demarcation of unclassed forest lands, most states relied on existing data from forest and revenue departments. Some states, like Manipur and Sikkim, simply quoted figures from the Forest Survey of India (FSI).
    • Question on Data: The reliability of data is questioned, with Haryana’s report lacking clarity on data sources and creation dates. Only nine states provided the extent of unclassed forests, while others focused on different types of forest areas specified in the order.
    1. Lack of clarity in the Reports:
    • Failed to specify the geographic locations: Most states and UTs failed to specify the geographic locations of forests in their SEC reports, rendering the information provided largely unhelpful for accurate identification and protection.
      • But Tripura was an exception, providing Khaitan numbers for forest areas beyond those officially recorded, but the classification of land remained unclear.
    • Lack of on-ground verification: SEC is lagging that on-ground verification may have led to the widespread destruction of forests that should have been identified and protected nearly three decades ago.
      • Instances like Kerala’s SEC excluding ecologically significant areas like Pallivasal unreserve and Chinnakanal unreserve, critical for wildlife corridors and conservation, showcase the lack of diligence in identifying and protecting vital forest areas.

    Suggested Measures:

    • Extended Timeline: Provide states with a more realistic timeline to conduct comprehensive surveys and data verification, considering the voluminous nature of the task and the need for accuracy.
    • Ground Truthing and Surveys: Mandate states to conduct ground-truthing, physical cadastral surveys, and demarcation of unclassed forest lands to ensure accurate identification and mapping of forest areas.
    • Data Verification: Implement mechanisms for verifying and cross-referencing data obtained from various sources, such as forest and revenue departments and the Forest Survey of India, to ensure reliability and consistency.

    Main PYQ: 

    Q Examine the status of forest resources of India and its resultant impact on climate change.(UPSC IAS/2020)

  • Why the Thar Desert on the borders of India and Pakistan is getting greener?

    Why in the News?

    Rajasthan’s barren Thar Desert may turn green, says a recent study in the journal Earth’s Future.

    Thar Desert

    • The Thar Desert is the 18th largest subtropical desert globally and is one of the most densely populated deserts.
    • Approximately 40% of the human population in Rajasthan resides in the Thar Desert.
    • It extends from the Sutlej River and is bounded by the Rann of Kutch, the Aravalli Mountains, and the Indus River.
    • About 85% of the Thar Desert is located in India, with the remainder in Pakistan.
    • In India, it spans across Rajasthan, Gujarat, Haryana, and Punjab as well.
    • Civilizations are believed to have thrived in the Thar region around 50,000 years ago across the extinct Saraswati River.
    • The Desert National Park (home to the endangered Great Indian Bustard, desert fox, desert cat, blackbuck, and Indian gazelle) is situated in the Thar Desert in the northwest Indian state of Rajasthan.

    Why is the Thar desert getting greener?

    • Climate Change Effects:
        • Alteration of Weather Patterns: Climate change is causing shifts in rainfall distribution in the thar desert area.
        • Potential for Vegetation Growth: The increased precipitation could provide favorable conditions for vegetation growth, contributing to the greening of the desert.
    • Indian Monsoon Dynamics:
        • Westward Extension of Indian Monsoon: The Indian monsoon, known for bringing heavy rainfall to eastern India, is now extending further westward into regions like the Thar Desert.
        • Impact on Moisture and Rainfall: This change in monsoon dynamics could lead to increased moisture and rainfall in the desert region, facilitating the growth of vegetation.
    • Expansion of Indian Ocean Warm Pool (IOWP):
        • Influence on Monsoon Patterns: The Indian Ocean Warm Pool (IOWP) influences monsoon patterns and rainfall distribution over the Indian subcontinent.
        • Westward Expansion due to Climate Change: Climate change is causing the IOWP to expand westward, potentially resulting in increased rainfall over semi-arid regions like the Thar Desert and promoting greening.
    • Water Management Practices:
        • Contribution to Greening: Effective water management practices, such as rainwater harvesting and irrigation techniques like johad, kuis, and kunds, may be playing a role in the greening of the Thar Desert.
        • Utilization of Water Resources: By harnessing and efficiently utilizing available water resources, local communities and authorities can support vegetation growth and ecosystem restoration efforts in the desert.
    • Introduction of Irrigation  
      • Commercial Cropping: Irrigation was introduced during British colonial rule in the 19th and 20th centuries to convert arid and semi-arid ecosystems into cropland.
      • Restrictions on Grazing: The right to graze animals was restricted to landowners who cultivated crops, leading to the transformation of nomadic pastoralists into sedentary agro-pastoralists.

    PYQ:

    [2018] Which of the following leaf modifications occur(s) in the desert areas to inhibit water loss?

    1. Hard and waxy leaves
    2. Tiny leaves
    3. Thorns instead of leaves

    Select the correct answer using the code given below:

    (a) 2 and 3 only

    (b) 2 only

    (c) 3 only

    (d) 1, 2 and 3

    [2020] The process of desertification does not have climate boundaries. Justify with examples.

    [2013] Major hot deserts in northern hemisphere are located between 20-30 degree north and on the western side of the continents. Why?

  • Anticyclones, hanging even now over India, link warming to heat | Explained

    Why in the news?

    The record warming of 2023 has so far not been fully explained since it was much warmer than expected just from the superposition of El Nino on global warming.

    About Anticyclone:

    • An anticyclone is a weather phenomenon defined as a large-scale circulation of winds around a central region of high atmospheric pressure, clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere.

    The link between ElNino and Anticyclone: 

    • El Nino events can lead to the formation of anticyclone events. During El Niño, the weakening or reversal of the Walker circulation and strengthening of the Hadley circulation caused warm ocean water to develop in the central and east-central equatorial Pacific.

    The link between anticyclone and heat 

    • Stability and Weather Patterns: Anticyclones are areas of high pressure in the atmosphere characterized by descending air, which stop the cloud formation and precipitation. This stable air mass tends to promote clear skies and can lead to prolonged periods of hot and dry weather.
    • Amplification by Global Warming: Studies suggest that global warming can intensify anticyclones, making them stronger and more persistent. Warmer temperatures due to climate change can enhance the evaporation of moisture from land and water surfaces, further reinforcing the stability of anticyclonic conditions.
    • Feedback Loop: Anticyclones can create a feedback loop with global warming. As anticyclones persist, they can exacerbate heatwaves by trapping heat near the surface, preventing it from escaping into the upper atmosphere. This trapped heat can then further strengthen the anticyclone, leading to a self-reinforcing cycle of heat and stability.

    What are the stages of early warnings?

    The stages of early warnings on the ‘ready-set-go’ system for disaster management

    • Ready: This stage involves providing a seasonal outlook based on background states and external factors like global warming and El Niño. The aim is to maximize the accuracy of longer-lead forecasts, enabling organizations like the National Disaster Management Agency (NDMA) and local governments to prepare their disaster response systems accordingly.
    • Set: In this stage, subseasonal predictions for weeks two to four are utilized. Resource allocations are made, and potential hotspots are identified to ensure that disaster preparedness is in place. This step involves moving resources, including personnel, to areas that are identified as at risk based on the extended range forecasts.
    • Go: The final stage, based on short- and medium-range forecasts (days 1-10), involves the activation of disaster response efforts. This includes implementing rescue operations, setting up hydration centers, heat shelters, and other necessary measures to manage the disaster effectively.

    Conclusion: All evidence suggests India’s prediction system and early warning systems continue to improve and the NDMA has worked these details well into its ‘ready-set-go’ system.The remaining challenges are to build resilience for the future by better predicting the trajectory of the weather at every location over India.

    Mains PYQ 

    Q Drought has been recognized as a disaster in view of its spatial expanse, temporal duration, slow onset and lasting effects on vulnerable sections. With a focus on the September 2010 guidelines from the National Disaster Management Authority (NDMA), discuss the mechanisms for preparedness to deal with likely El Nino and La Nina fallouts in India.

    https://www.thehindu.com/sci-tech/science/anticyclones-hanging-even-now-over-india-link-warming-to-heat/article68117359.ece

  • In news: Pripyat River

    Why in the news?

    • The WWF has issued a stark warning regarding the dredging of the Pripyat River, adjacent to the Chernobyl nuclear disaster site.
    • Concerns mount as the Pripyat River could transform into a permanent repository of radioactive substances, contaminating the water and food sources.

    About Pripyat River

    • Pripyat River is a significant waterway in Eastern Europe. It flows through Ukraine, Belarus, and a small portion of Russia.
    • It is primarily situated within the Polesian Lowland, a region characterized by marshes, wetlands, and forests.
    • The Pripyat River is approximately 761 km (473 miles) long.
    • Physical Features:
    • Tributaries: It has numerous tributaries, including the Stokhid River, Styr River, and Horyn River. The largest tributary of the Pripyat is the Teterev River, which joins it from the right bank.
    • Drainage Basin: Its basin covers an area of around 121,000 square kilometers (46,700 square miles). It is one of the major tributaries of the Dnieper River, which eventually flows into the Black Sea.

    Notable event: The Pripyat River gained international attention due to its proximity to the Chernobyl Nuclear Power Plant, where the catastrophic nuclear accident occurred in 1986.

    About Chernobyl Nuclear Disaster

    • The Chernobyl Disaster occurred on April 26, 1986.
    • It took place at the Chernobyl Nuclear Power Plant, near the town of Pripyat in northern Ukraine, then part of the Soviet Union.
    • The explosion and subsequent fire released a large amount of radioactive material such as cesium-137 and strontium-90 into the atmosphere, resulting in widespread contamination.

     

    PYQ:

    [2020] Consider the following pairs?

    River — Flows into

    1. Mekong — Andaman sea
    2. Thames — Irish Sea
    3. Volga — Caspian Sea
    4. Zambezi — Indian Ocean

    Which of the pairs above is/are correctly matched?

    (a) Only 1

    (b) Only 2

    (c) Only 3

    (d) None of the above/More than one of the above

  • Sympathetic Solar Flares

    Why in the news?

    A rare celestial event unfolded as four solar flares called as Sympathetic Solar Flares simultaneously, signaling the onset of the Sun’s dynamic 11-year solar cycle.

    What is a Solar Cycle?

    • Given the Sun’s dynamic nature, electrically charged gases on its surface generate powerful magnetic fields, known as magnetic fields.
    • These magnetic fields undergo stretching, twisting, and tangling due to the constant movement of gases on the Sun’s surface, resulting in solar activity.
    • Scientists monitor solar cycles using sunspots. Solar activity fluctuates throughout the solar cycle, which typically spans about 11 years. 
    • The onset of a solar cycle typically features minimal sunspot activity, termed as a solar minimum.
    • For instance, the last Solar Cycle 25 commenced in December 2019, characterized by a low number of sunspots.

    What are Sympathetic Solar Flares?

    • Sympathetic solar flares are solar eruptions that occur in close temporal and spatial proximity to another solar flare or eruption.
    • These events are believed to be interconnected through magnetic fields or other physical processes occurring on the Sun.
    • When a solar flare or eruption happens on the Sun, it releases a burst of electromagnetic radiation and charged particles into space.
    • In some cases, the energy released during these events can cause disturbances in the Sun’s magnetic field.
    • These disturbances can trigger the occurrence of additional flares loop or eruptions in nearby regions of the Sun’s surface.
    • This event follows coronal mass ejections (CMEs) and intense plasma bursts.

    Implications for Earth

    • Potential impacts include disruptions to power grids, interference with communication networks, and increased radiation exposure for astronauts and aircraft passengers.
    • Solar storms can lead to spectacular natural light shows known as auroras, which are typically visible near the Earth’s magnetic poles.

    PYQ:

    [2012] The increasing amount of carbon dioxide in the air is slowly raising the temperature of the atmosphere, because it absorbs:

    (a) the water vapour of the air and retains its heat

    (b) the ultraviolet part of the solar radiation

    (c) all the solar radiations

    (d) the infrared part of the solar radiation

  • Icequakes on Ross Ice Shelf

    Why in the news?

    • Scientists found out that the huge Ross Ice Shelf, almost as big as France, moves forward a few centimetres daily.
    • This happens because of the Whillans Ice Stream, a fast-moving river of ice that sometimes gets stuck and then suddenly moves forward.

    About Ross Ice Shelf

    • Ross Ice Shelf is the largest ice shelf of Antarctica roughly the size of France.
    • It was discovered by Sir James Clark Ross on 28 January 1841.
    • The shelf spans an area of roughly 500,809 square kilometers, about the size of France or the Yukon Territory in Canada.
    • It is several hundred meters thick. In the shelf’s southern reaches, nearest the True South Pole, the ice can be as thick as 750m.
    • The nearly vertical ice front to the open sea is more than 600 km long, and between 15 and 50 meters high above the water surface. However, 90% of the floating ice is below the water surface.
    • It is fed primarily by giant glaciers, or ice streams, that transport ice down to it from the high polar ice sheet of East and West Antarctica.
    • Most of Ross Ice Shelf is in the Ross Dependency claimed by New Zealand.
    • It floats in, and covers, a large southern portion of the Ross Sea and the entire Roosevelt Island located in the east of the Ross Sea.

    Spotlight: Icequakes on Ross Ice Shelf

    • Influence of Ice Stream: Most glaciers move slowly, but the Whillans Ice Stream stops and starts suddenly. This might happen because there isn’t enough water below to help it move smoothly.
    • Sudden Movements: These sudden movements, like tiny earthquakes, push against the Ross Ice Shelf.
    • Threat to Stability: Even though these daily shifts aren’t caused by humans, they could make the Ross Ice Shelf weaker over time. Ice shelves slow down the flow of ice into the ocean.
    • Retreat of Glacier: If the Ross Ice Shelf gets weaker or breaks, it could speed up melting and raise sea levels.

    PYQ:

    [2013] On the planet earth, most of the freshwater exists as ice caps and glaciers. Out of the remaining freshwater, the largest proportion

    (a) Is found in the atmosphere as moisture and clouds

    (b) Is found in freshwater lakes and rivers

    (c) Exists as groundwater

    (d) Exists as soil moisture

  • In the news: Pulicat Wetland

    Why in the news?

    • Settlement of claims for local communities within Pulicat Wetland and Birds Sanctuary boundary raises concerns.
    • State government plans to denotify a significant portion of the sanctuary and Eco-Sensitive Zone (ESZ) for industrial park development.

    About Pulicat Wetland and Birds Sanctuary

    • Pulicat Lake Bird Sanctuary is the second-largest bird sanctuary in India.
    • It cuts across Nellore district of Andhra Pradesh and Thiruvallur district of Tamil Nadu.
    • The sanctuary is situated along the coast of the Bay of Bengal covering an area of 759 square kilometers.
    • The sanctuary is bordered by the Arani River at its southern tip, the Kalangi River from the Northwest, and the Swarnamukhi River at the northern end.
    • Pulicat Lake runs parallel to the Bay of Bengal and has a sand bar, making it a lagoon of its own kind.
    • Sriharikota, renowned as India’s rocket launch pad and home to the Satish Dhawan Space Centre, separates the lake from the Bay of Bengal.
    • The sanctuary includes 16 island villages and 30 villages adjoining the lake, whose inhabitants depend on the lake for their livelihood.
    • Pulicat Lake Bird Sanctuary hosts a large number of migratory birds during winter, including gulls, terns, plovers, shanks, curlews, and storks.
    • It is a habitat for a variety of bird species such as flamingos, pelicans, storks, herons, and ducks.

    What are the Eco-sensitive Zones (ESZs)?

    •  Eco-Sensitive Zones (ESZs) or Ecologically Fragile Areas (EFAs) are areas notified by the MoEFCC around Protected Areas, National Parks and Wildlife Sanctuaries.
    • The purpose of declaring ESZs is to create some kind of “shock absorbers” to the protected areas by regulating and managing the activities around such areas.
    • They also act as a transition zone from areas of high protection to areas involving lesser protection.

     How are they demarcated?

    • The Environment (Protection) Act, 1986 does NOT mention the word “Eco-Sensitive Zones”.
    • However, Section 3(2)(v) of the Act, says that Central Government can restrict areas in which any industries, operations or processes or class of industries, operations or processes shall be carried out or shall not, subject to certain safeguards.
    • Besides Rule 5(1) of the Environment (Protection) Rules, 1986 states that central government can prohibit or restrict the location of industries and carrying on certain operations or processes on the basis of certain considerations.
    • The same criteria have been used by the government to declare No Development Zones (NDZs).

    Defining its boundaries

    • An ESZ could go up to 10 kilometres around a protected area as provided in the Wildlife Conservation Strategy, 2002.
    • Moreover, in the case where sensitive corridors, connectivity and ecologically important patches, crucial for landscape linkage, are beyond 10 km width, these should be included in the ESZs.
    • Further, even in the context of a particular Protected Area, the distribution of an area of ESZ and the extent of regulation may not be uniform all around and it could be of variable width and extent.

     

    PYQ:

     [2017] Consider the following statements:

    1. In India, the Himalayas are spread over five States only.

    2. Western Ghats are spread over five States only.

    3. Pulicat Lake is spread over two States only.

    Which of the statements given above is/are correct?

    (a) 1 and 2 only

    (b) 3 only

    (c) 2 and 3 only

    (d) 1 and 3 only

  • Intergovernmental Negotiating Committee (INC-4) Meeting in Ottawa

    Why in the news?

    • The fourth session of the Intergovernmental Negotiating Committee (INC-4) is happening in Ottawa, Canada.
    • The goal is to finalize a global agreement on plastic pollution by November this year.

    What is the Intergovernmental Negotiating Committee (INC)?

    • INC is a committee that aims to develop a legally binding international instrument to end plastic pollution by 2025, as mandated by United Nations Environment Assembly (UNEA) Resolution 5/14.
    • It began working in November 2022 at Punta del Este, Uruguay (INC-1).
      • The second meeting (INC-2) took place in May-June, 2023 at Paris, France.
      • The INC-3 met in Nairobi in December 2023.
    • INC is scheduled to complete its work by the end of 2024.

    Key Points from INC-4:

    • Previous meetings (INC-1, INC-2, INC-3) paved the way for this one.
    • They’re focusing on cutting out unnecessary plastic use while still using it for important things like renewable energy.

    Future Prospects:

    • INC-5 will happen in Busan, South Korea, and it’s meant to finalize everything.
    • After that, leaders from different countries will sign the agreement.

     

    PYQ:

    [2014] With reference to ‘Global Environment Facility’, which of the following statements is/are correct?

    (a) It serves as financial mechanism for ‘Convention on Biological Diversity’ and ‘United Nations Framework Convention on Climate Change’

    (b) It undertakes scientific research on environmental issues at global level

    (c) It is an agency under OECD to facilitate the transfer of technology and funds to underdeveloped countries with specific aim to protect their environment.

    (d) Both A and B

  • On the National Clean Air Programme | Explained

    Why in the news? 

    When the Indian government launched the National Clean Air Programme (NCAP) in 2019, it’s target was to cut the concentration of atmospheric Particulate Matter (PM) by 20-30% by 2024, from 2017 levels. This was later revised to 40% by 2026.

    What is the NCAP?

    • The National Clean Air Programme (NCAP) was launched in India in January 2019 by the Ministry of Environment, Forest and Climate Change (MoEFCC)
    • The NCAP aims to achieve reductions in PM10 levels through various measures.

    What is PM10? 

    • PM 10, also known as particulate matter with an aerodynamic diameter of less than 10 micrometers.
    • PM 10 particles can irritate the eyes, nose, and throat, and prolonged exposure to high levels of PM 10 can lead to serious health problems, including respiratory issues, cardiovascular disease, and even premature death.

    Key features of NCAP (Note: asked in UPSC 2020 mains)

    • Target: Achieving 20% to 30% reduction target in Particulate Matter (PM10 and PM2.5) concentrations by 2024, where 2017 is kept as the base year for the comparison of concentration. But it has been revised to 40% by 2026.
    • Cities based on air quality:Identification of 122 non-attainment cities across the country based on the 2014-2018 Air Quality data.
    • City specific plans: Preparation of city-specific action plans, including measures to strengthen the monitoring network, reduce vehicular/industrial emissions, and increase public awareness.
    • Coordination between centre, state and local: Facilitating collaborative, multi-scale, and cross-sectoral coordination between the relevant central ministries, state governments, and local bodies.
    • Right mix with exixting policies: Establishing a right mix with the existing policies and programs, including the National Action Plan on Climate Change (NAPCC) and other government initiatives related to climate change.
    • Changes as per additional scientific information: Constant change, activity, and progress to get evolved based on the additional scientific and technical information as they emerge.
    • Monitoring station: Increasing the number of monitoring stations in the country, including rural monitoring stations, technology support, and data analysis.
    • Awareness and capicity building: Emphasis on awareness and capacity building initiatives, including public awareness campaigns, training programs, and research and development activities.

     Challenges related to NCAP 

    • Lack of fund Utilization: On average, only 60% of the allocated funds have been utilized so far, with 27% of cities spending less than 30% of their designated budgets. Notably, Visakhapatnam and Bengaluru have spent 0% and 1% of their NCAP funds, respectively.
    • Implementation Delays: Delays in implementing CAAPs are attributed to various factors, including bureaucratic hurdles such as delays in approvals from competent authorities and the absence of standard operating procedures.
    • Technical Challenges: Technical challenges, such as defining technical specifications for tendering processes and procuring necessary equipment like mechanical sweepers and electric buses, contribute to implementation delays.

    How scientific tool can help?

    • Emissions Inventory (EI): EIs provide crucial insights into local pollution sources and their contributions, aiding in forecasting future emissions and shaping targeted pollution control strategies. 
    • Source Apportionment (SA) Studies: SA studies offer detailed analyses of contributions from various pollution sources, including distant ones.
    • Role of Air Quality (AQ) Modelling: AQ modelling helps in understanding pollution dispersion, including from distant sources.
    • Role of EI, SA and AQ: Combining EI, SA studies, and AQ modelling allows for a comprehensive understanding of pollution sources, their contributions, and dispersion patterns.

    Conclusion: 

    Implement stricter monitoring mechanisms to ensure timely and efficient fund utilization. Regular audits and reviews can help identify underutilization and take corrective actions promptly.

    Mains PYQ

    Q What are the key features of the National Clean Air Programme (NCAP) initiated by the government of India? (UPSC IAS/2020)

  • ISRO’s Findings on Glacial Lake Dynamics in Himalaya

     

    Why in the News?

    • The Satellite images by ISRO show an increase in the size of Gepang Gath Lake amidst rising concerns about Climate Change.
    • Gepang Gath Lake (one of the biggest Glacial lakes in the Chandra basin) is located in the Western Indian Himalaya at the terminus of the Gepan Gath glacier.

    ISRO’s Findings on Glacial Lakes in Himalayas 

    Expansion of Glacial Lakes

    • During 2016-17, total of 2,431 lakes larger than 10 hectares were identified, among which 676 were identified as glacial lakes. Notably, these 676 glacial lakes have shown significant expansion since 1984. A staggering 89% (601 lakes) of the expanding lakes have more than doubled in size since 1984.
    • Regional Distribution: Out of these expanding glacial lakes, 130 are situated within India. Among these, 65 lakes are located in the Indus River basin, seven in the Ganga River basin, and 58 in the Brahmaputra River basin.
    • The derived analysis from the Satellite provides valuable insights for understanding glacial lake dynamics.
    • It is essential for assessing environmental impacts and developing strategies for Glacial Lake Outburst Floods (GLOF) risk management and climate change adaptation in glacial environments.

     

    What are Glacial Lakes?

     

      • Glacial lakes are bodies of water formed in depressions on the surface of glaciers or in moraines left behind by retreating glaciers.
      • Glacial lakes were categorized based on their formation process into four broad categories: 
        • Moraine-dammed, 
        • Ice-dammed, 
        • Erosion, and 
        • Other glacial lakes.
      • Among the expanding lakes, the majority are Moraine-dammed (307), followed by Erosion (265), other (96), and Ice-dammed (8) glacial lakes.
      • Formation Process: Glacial lakes form through the accumulation of meltwater from the melting ice of glaciers. As glaciers move, they carve out depressions in the landscape, which may fill with water to form lakes.
        • When glaciers retreat, they leave behind moraines, which can act as natural dams, trapping meltwater and forming lakes.
      • Characteristics:
        • Vary in size, depending on the size and activity of the glacier.
        • Found in mountainous regions and polar areas where glaciers are present.
        • The primary source of water is melting glacial ice, precipitation and runoff.
    • Significance of Glacial Lakes:
      • Glacial lakes play a crucial role in regulating water flow in glacier-fed rivers, particularly during the dry season.
      • Provides habitat for unique aquatic species adapted to cold, high-altitude environments.
      • Contributes to landscape evolution and the formation of landforms such as cirques and tarns.
    • Present Ecological Challenges:
      • Glacial Outburst Floods: The sudden release of water from glacial lakes, known as glacial lake outburst floods (GLOFs), can pose significant hazards to downstream communities and infrastructure. Ex. Chamoli Disaster.
      • Rapid Expansion: Glacial lakes can rapidly expand due to the increased melting of glaciers, leading to the risk of flooding and landslides in surrounding areas.

    Important Glacial Lakes in India:

    • Deosai National Park (Jammu and Kashmir): Known for its numerous glacial lakes.
    • Gangbal Lake (Jammu and Kashmir): At the base of Mount Haramukh.
    • Zanskar Valley Lakes (Jammu and Kashmir): Includes Tsomoriri Lake, Tsokar Lake, and many others.
    • Roopkund Lake (Uttarakhand): Known for the human skeletons found at its bottom.
    • Sarson Patal Lake (Uttarakhand): Within the Nanda Devi Biosphere Reserve.
    • Deoria Tal (Uttarakhand): Offering stunning views of the surrounding peaks.
    • Hemkund Lake (Uttarakhand): Near the Hemkund Sahib Gurudwara.
    • Kedar Tal (Uttarakhand): At the foot of the Thalay Sagar peak.
    • Nanda Devi East Base Lake (Uttarakhand): Offering views of the Nanda Devi peaks.
    • Vasuki Tal (Uttarakhand): Near the Chaturangi Glacier.
    • Chandratal Lake (Himachal Pradesh): Known for its crescent shape.
    • Suraj Tal (Himachal Pradesh): Close to the Baralacha La pass.
    • Rupin Lake (Himachal Pradesh): Near the Rupin Pass.
    • Gurudongmar Lake (Sikkim): One of the highest lakes in the world.

     

    PYQ:

    [2020] Siachen Glacier is situated to the

    (a) East of Aksai Chin

    (b) East of Leh

    (c) North of Gilgit

    (d) North of Nubra Valley