Western Himalaya Faces Steep Snow Loss: UPSC Climate Change Study 2024

20 Aug Western Himalaya Faces Steep Snow Loss: UPSC Climate Change Study 2024

✎ The Western Himalaya is warming faster than other Himalayan sectors, with winter temperatures projected to rise by over 7°C by 2100 under high-emission scenarios, leading to significant snow loss and cascading impacts on water…

Subject Relevance — Where This Topic Fits

• GS Paper I — Geography (Climate Change and Glacial Studies)  |  GS Paper III — Environment and Disaster Management
• Prelims: Western Himalaya, cryosphere, glacial retreat, snow albedo effect, El Niño-Southern Oscillation (ENSO), Indian Summer Monsoon (ISM), Himalayan glaciers, climate sensitivity, emission scenarios (RCP/SSP), Himalayan regionalisation (Western/Central/Eastern), snow-water equivalent (SWE), cryosphere-atmosphere interactions
• Essay: Climate change and its disproportionate regional impacts: The case of the Himalayas, Water security in the 21st century: Challenges and governance in Himalayan river basins

Quick Revision: The Western Himalaya is warming faster than other Himalayan sectors, with winter temperatures projected to rise by over 7°C by 2100 under high-emission scenarios, leading to significant snow loss and cascading impacts on water security and ecosystems.

Why is this in the news?

A recent peer-reviewed study published in the *Journal of Earth System Science* (June 2026) highlights that the Western Himalaya is warming at an accelerated rate compared to other Himalayan sectors, with projections indicating a potential winter temperature rise exceeding 7°C by 2100 under high-emission scenarios. The study underscores the region’s heightened vulnerability to snow loss, which could disrupt seasonal water availability, biodiversity, and livelihoods dependent on cryospheric resources.

Background

• The Himalayas, often termed the ‘Third Pole’, store the largest volume of snow and ice outside the polar regions, serving as a critical water source for over 1.3 billion people in South Asia.
• Regional climatic variability within the Himalayas is influenced by factors such as topography, monsoon dynamics, and global teleconnections like the El Niño-Southern Oscillation (ENSO).
• Historical temperature records (1901–2020) reveal a discernible warming trend across the Himalayas, with the Western Himalaya exhibiting the highest sensitivity to climate forcing.
• Glacial and snow cover dynamics in the Himalayas are governed by seasonal temperature and precipitation patterns, with winter snow accumulation and spring melt playing pivotal roles in river discharge regimes.
• The Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR6) projects enhanced warming in high-altitude regions, particularly the Hindu Kush Himalaya (HKH), due to elevation-dependent climate sensitivity.
• India’s National Action Plan on Climate Change (NAPCC) and the National Mission on Himalayan Studies (NMHS) acknowledge the Himalayas as a climate-sensitive zone requiring targeted adaptation and mitigation strategies.

What is the Western Himalayan Cryosphere and Why Does Its Warming Matter?

• The Western Himalayan cryosphere encompasses the snow and glacier systems spanning Ladakh, Jammu & Kashmir, and Himachal Pradesh, characterised by high-altitude glaciers, seasonal snowpack, and permafrost.
• The region’s cryosphere acts as a natural water reservoir, releasing meltwater during spring and summer to feed major river systems such as the Indus, Ganga, and their tributaries.
• Warming trends in the Western Himalaya are driven by a combination of global greenhouse gas emissions, regional atmospheric circulation changes, and local feedback mechanisms like the snow-albedo effect.
• Winter warming outpaces spring warming due to stronger radiative forcing in the cold season, reducing snow accumulation and increasing the duration of bare ground exposure, which absorbs more solar radiation.
• Projections indicate that under high-emission scenarios (SSP5-8.5), the Western Himalaya could experience a 7°C increase in winter temperatures by 2100, compared with the early 1900s.
• Snow loss in the region is projected to be three times greater under high-emission pathways than under low-emission scenarios (SSP1-2.6), exacerbating water scarcity and ecosystem stress.
• The study utilises a multi-model ensemble approach, combining observational data (1901–2020) with climate model projections to assess regional climate sensitivity and snow cover dynamics.
• Regional disparities in warming rates (Western > Central > Eastern Himalaya) highlight the need for tailored climate adaptation strategies across Himalayan sectors.

Key Features

Feature	Significance
Warming asymmetry across Himalayan sectors	Western Himalaya exhibits faster warming (7.18°C by 2100 under high emissions) than central (6.71°C) or eastern (5.82°C) sectors, necessitating sector-specific climate adaptation strategies.
Seasonal warming trends	Winters warm faster than springs (7.18°C vs 6.91°C in western Himalaya by 2100), disrupting snow accumulation and melt cycles critical for water security.
Diurnal temperature variation	Night-time temperatures rise faster than daytime highs, exacerbating glacial and snowfield ablation due to reduced radiative cooling.
Snow-albedo feedback mechanism	Reduced snow cover lowers surface albedo, increasing heat absorption and accelerating further snowmelt, creating a self-reinforcing cycle.
Multi-model validation approach	Study integrates 120 years of empirical data with eight global climate models under five emission scenarios, enhancing predictive reliability for policymakers.

Why it Matters

Hydrological Security

• The Western Himalaya supplies critical river systems (Indus, Ganges, Yamuna) whose glacier and snowmelt contributions sustain 500+ million people downstream, making snow loss a transboundary water governance challenge.
• Seasonal snowpack acts as a natural reservoir; accelerated melt disrupts irrigation cycles, hydroelectric generation (e.g., Nathpa Jhakri, Dulhasti), and urban water supplies (e.g., Shimla, Srinagar).
• Glacial lake outburst floods (GLOFs) risk increases with warmer winters, as unstable moraine dams and permafrost degradation become more prevalent.

Economic Implications

• Tourism-dependent economies (e.g., Himachal Pradesh’s snow sports, Ladakh’s trekking routes) face revenue losses due to shortened winter seasons and reduced snow cover.
• Agricultural productivity in Himalayan foothills (e.g., apple orchards in Himachal) is threatened by altered precipitation patterns and heat stress.
• Infrastructure vulnerability rises with permafrost thaw, affecting roads (e.g., Manali-Leh highway) and high-altitude settlements.

Ecological Consequences

• Biodiversity hotspots (e.g., Great Himalayan National Park) risk habitat fragmentation as treeline shifts upward and endemic species face range contractions.
• River ecosystems dependent on cold-water habitats (e.g., trout fisheries) may collapse due to thermal regime changes.
• Carbon sink degradation: thawing permafrost could release stored methane, exacerbating global warming.

Strategic and Geopolitical Dimensions

• Transboundary water-sharing agreements (e.g., Indus Waters Treaty) may face strain as upstream snowmelt patterns alter, requiring renegotiation of flow-sharing mechanisms.
• Military logistics in high-altitude regions (e.g., Siachen, Ladakh) are compromised by thawing permafrost and unstable terrain, impacting border infrastructure maintenance.

Challenges

1. Climate-Induced Water Scarcity

• Disruption of seasonal snowmelt timing alters river discharge patterns, leading to summer water shortages in plains-dependent states (e.g., Punjab, Haryana).
• Groundwater recharge declines as reduced snowmelt diminishes aquifer replenishment in Himalayan catchments.
• Interstate disputes may intensify over shared river systems (e.g., Sutlej, Beas) due to competing demands for irrigation and hydropower.

UPSC Link: GS3: Climate Change & Water Resources

2. Glacial Retreat and GLOF Risks

• Accelerated glacial melt increases the formation of unstable glacial lakes, heightening GLOF risks for downstream communities (e.g., Chamoli disaster, 2021).
• Early warning systems and community preparedness remain inadequate despite technological advancements in remote sensing.
• Urban planning in Himalayan valleys (e.g., Joshimath) must account for subsidence risks from thawing permafrost.

UPSC Link: GS3: Disaster Management

3. Biodiversity Loss and Ecosystem Collapse

• Shift in treeline elevation threatens alpine flora and fauna, including flagship species like the snow leopard and Himalayan monal.
• Invasive species proliferation may outcompete endemic flora adapted to colder climates.
• Pollination networks and seed dispersal mechanisms are disrupted, affecting forest regeneration.

UPSC Link: GS3: Environment & Biodiversity

4. Infrastructure Vulnerability

• Road networks (e.g., NH-3, NH-22) face increased landslide risks due to thawing permafrost and intensified rainfall events.
• Hydroelectric projects (e.g., Teesta, Chenab basins) encounter reduced generation efficiency due to altered flow regimes.
• High-altitude settlements (e.g., Leh, Tawang) require retrofitting for thermal stress and energy demands.

UPSC Link: GS3: Infrastructure & Disaster Resilience

5. Policy and Governance Gaps

• Lack of a unified Himalayan climate action plan despite sectoral policies (e.g., National Mission for Sustaining Himalayan Ecosystem).
• Inadequate integration of climate projections into state-level disaster management plans.
• Limited funding for community-based adaptation initiatives in remote Himalayan districts.

UPSC Link: GS2: Governance & Policy Implementation

Challenges — UPSC Perspective

Issue	Concern
Accelerated glacial retreat	Disruption of long-term water security for 500+ million people dependent on Himalayan river systems.
Altered snowmelt timing	Mismatch between water demand (agriculture, hydropower) and supply, exacerbating summer shortages.
Increased GLOF frequency	Catastrophic flooding risks for downstream communities, infrastructure, and biodiversity hotspots.
Permafrost thaw	Instability of high-altitude infrastructure, including roads, bridges, and military installations.
Biodiversity loss	Collapse of endemic species populations and ecosystem services (e.g., pollination, carbon sequestration).
Policy fragmentation	Absence of a cohesive regional climate adaptation strategy across Himalayan states.

Government Initiatives — Must-Memorise for Prelims

• National Mission for Sustaining the Himalayan Ecosystem (NMSHE)
• National Adaptation Fund for Climate Change (NAFCC)

Way Forward

• Integrate Himalayan climate projections into state-level water resource planning and disaster management frameworks.
• Expand glacio-hydrological monitoring networks using remote sensing and in-situ sensors for real-time data assimilation.
• Develop sector-specific adaptation plans for agriculture (e.g., drought-resistant crops), tourism (e.g., snow sports infrastructure), and energy (e.g., flexible hydropower scheduling).
• Strengthen transboundary cooperation on climate-resilient water management (e.g., Indus Waters Treaty review mechanisms).
• Enhance community resilience through capacity-building programs on early warning systems and climate-smart livelihoods.
• Invest in research on permafrost dynamics and its implications for high-altitude infrastructure stability.
• Promote afforestation and ecosystem restoration in critical catchments to mitigate soil erosion and landslide risks.
• Establish a dedicated Himalayan Climate Fund to finance adaptation and mitigation initiatives across states.

UPSC Value Addition

Prelims Practice Questions

Q1. Consider the following statements regarding the recent study on Western Himalayan warming:
1. The study found that winters in the Western Himalaya are warming faster than springs.
2. The study projects that under high emissions, the western Himalayan winter could warm by more than 7°C by 2100.
3. The study indicates that the central Himalaya will face the steepest snow loss compared to the western and eastern Himalaya.

How many of the above statements are correct?

1. Only one
2. Only two
3. All three
4. None

Answer: Only two — Statement 1 and 2 are correct as per the study. Statement 3 is incorrect because the study found that the western Himalaya will face the steepest snow loss, not the central Himalaya.

Q2. Assertion (A): The Himalayan cryosphere is warming faster in the western stretches compared to the central and eastern Himalaya.
Reason (R): The study attributes this to the higher sensitivity of the western Himalaya to climate change due to its topography and atmospheric circulation patterns.

Options:
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, but R is NOT the correct explanation of A.
C. A is true, but R is false.
D. A is false, but R is true.

Answer: ? — Both the assertion and reason are true, and the reason correctly explains the assertion based on the study’s findings.

Q3. Match the following Himalayan regions with their projected warming trends by 2100 under high-emission scenarios as per the recent study:

Column I (Region) Column II (Projected Warming in °C)
a. Western Himalaya 1. 5.82
b. Central Himalaya 2. 6.71
c. Eastern Himalaya 3. 7.18

Options:
A. a-3, b-2, c-1
B. a-1, b-2, c-3
C. a-2, b-3, c-1
D. a-3, b-1, c-2

Answer: ? — The correct match is: Western Himalaya (7.18°C), Central Himalaya (6.71°C), Eastern Himalaya (5.82°C).

Mains Practice Question

✍ Critically analyse the observed and projected impacts of climate change on the Himalayan cryosphere, with particular reference to the western Himalaya. Also, discuss the policy measures required to enhance climate resilience in the Himalayan states. (15 Marks)

Approach: MODEL-ANSWER SKELETON:

1. **Observed Impacts on Himalayan Cryosphere**
– Cite the recent study’s findings: Western Himalaya warming faster than central/eastern Himalaya; winters warming faster than springs; night-time temperatures rising faster than daytime highs.
– Explain the snow-albedo feedback mechanism: Less snow → darker surface → more heat absorption → accelerated snow melt.
– Reference 120-year temperature records (1901–2020) and eight global climate models used in the study.

2. **Projected Changes by 2100**
– High-emission scenario projections: Western Himalaya winter warming >7°C; spring warming ~6.91°C; central and eastern Himalaya warming comparatively less.
– Emphasise the disproportionate snow loss in the western Himalaya under high-emission pathways (three times larger than low-emission pathways).

3. **Regional Vulnerability and Consequences**
– Outline impacts on Himalayan states (Ladakh, Jammu & Kashmir, Himachal Pradesh): Water security, hydropower generation, agriculture, and ecosystem disruption.
– Discuss the broader implications for downstream regions dependent on Himalayan rivers (Ganga, Indus basins).

4. **Policy Measures for Climate Resilience**
– **Institutional Frameworks**: Role of National Mission for Sustaining the Himalayan Ecosystem (NMSHE) under the National Action Plan on Climate Change (NAPCC).
– **Adaptation Strategies**: Community-based disaster risk reduction, glacial lake outburst flood (GLOF) monitoring, and early warning systems.
– **Mitigation Measures**: Promotion of renewable energy (solar, hydro) in Himalayan states; afforestation and conservation of fragile ecosystems.
– **International Cooperation**: Collaboration under the Paris Agreement and regional initiatives like the International Centre for Integrated Mountain Development (ICIMOD).

5. **Challenges and Way Forward**
– Highlight governance challenges: Fragmented institutional responses, limited financial resources, and competing developmental priorities.
– Stress the need for integrated, multi-stakeholder approaches involving local communities, scientific institutions, and policymakers.

6. **Conclusion**
– Summarise the urgency of addressing climate change in the Himalayas, balancing adaptation and mitigation while ensuring sustainable development.

Source: The Indian Express

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