Forwarded from UPSC Mapping Prelims Mains UPPSC mppsc bpsc
🔆 Melting Glaciers May Trigger Volcanic Eruptions: Study
📍 West Antarctica, Iceland & New Zealand at highest risk
✅ Key Findings
• Melting glaciers & ice caps due to global warming reduce pressure on magma chambers.
• This pressure drop allows magma and gases to expand, triggering explosive volcanic eruptions.
• West Antarctica has ~100 buried volcanoes under ice and is most at risk.
✅ Global Evidence & Trends
• Past deglaciation in Iceland saw 30–50× higher eruption rates.
• Volcanoes beneath ice sheets (e.g., Mocho-Choshuenco, Chile) erupted when pressure dropped post-melt.
• Lower pressure = lower melting point of magma → more eruptions.
✅ Role of Precipitation
• Precipitation, altered by climate change, can penetrate underground, reacting with magma and triggering eruptions.
✅ Climate Feedback Effects
• Volcanic eruptions eject ash & sulfur dioxide into the stratosphere:
– Ash causes temporary cooling by blocking sunlight
– Sulfur dioxide forms reflective aerosols, cooling Earth
• But sustained eruptions release CO₂ and methane, contributing to long-term global warming.
✅ Conclusion
• A vicious cycle is emerging:
– Global warming melts glaciers
– Ice loss triggers eruptions
– Eruptions release GHGs → further warming
#GS1 #Geography #GS3 #ClimateChange #Volcanoes #environment
📍 West Antarctica, Iceland & New Zealand at highest risk
✅ Key Findings
• Melting glaciers & ice caps due to global warming reduce pressure on magma chambers.
• This pressure drop allows magma and gases to expand, triggering explosive volcanic eruptions.
• West Antarctica has ~100 buried volcanoes under ice and is most at risk.
✅ Global Evidence & Trends
• Past deglaciation in Iceland saw 30–50× higher eruption rates.
• Volcanoes beneath ice sheets (e.g., Mocho-Choshuenco, Chile) erupted when pressure dropped post-melt.
• Lower pressure = lower melting point of magma → more eruptions.
✅ Role of Precipitation
• Precipitation, altered by climate change, can penetrate underground, reacting with magma and triggering eruptions.
✅ Climate Feedback Effects
• Volcanic eruptions eject ash & sulfur dioxide into the stratosphere:
– Ash causes temporary cooling by blocking sunlight
– Sulfur dioxide forms reflective aerosols, cooling Earth
• But sustained eruptions release CO₂ and methane, contributing to long-term global warming.
✅ Conclusion
• A vicious cycle is emerging:
– Global warming melts glaciers
– Ice loss triggers eruptions
– Eruptions release GHGs → further warming
📝 Prelims MCQ:
Which of the following effects is caused by volcanic eruptions?
A) Only global cooling
B) Only global warming
C) Both cooling and warming depending on duration
D) Neither cooling nor warming
Answer: C
📝 Mains GS1/GS3 Question:
How does climate change affect volcanic activity and how might this contribute to climate feedback loops?
#GS1 #Geography #GS3 #ClimateChange #Volcanoes #environment
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doc2025715586701.pdf
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🔆 Monsoon: India’s Lifeline, Now More Unpredictable
📍 India’s monsoon is central to agriculture, economy, and culture — but climate change is reshaping its rhythm and risks.
✅ Monsoon rains affect over 64% of India’s population dependent on agriculture
✅ Only 55% of sown land is irrigated; rest depends on rain
✅ SW Monsoon (June–Sept) gives 75% of annual rain; essential for crops like rice, cotton
✅ NE Monsoon (Oct–Dec) benefits Tamil Nadu, SE coast
✅ Key drivers: ITCZ, El Niño (weakens rain), La Niña (boosts rain)
✅ Rain varies: Western Ghats & NE >400 cm; Rajasthan <60 cm
✅ Climate change impacts:
• 75% rise in extreme rainfall events (1950–2015)
• 27% rise in dry spells
• 50% rain now falls in just 20–30 hours
✅ IMD Accuracy: 100% accurate monsoon forecast (2021–24), ±5% of LPA
✅ Mission Mausam: 9-vertical weather upgrade mission for a “climate-smart Bharat”
✅ Lightning rising: Shift from NE to Central & Western India
📘 Source: Ministry of Earth Sciences, IMD, Economic Survey 2024-25
#GS1 #GS3 #IndianMonsoon #ClimateChange
#Geography #GS1 #prelims
Join @CSE_EXAM
@PIB_UPSC
📍 India’s monsoon is central to agriculture, economy, and culture — but climate change is reshaping its rhythm and risks.
✅ Monsoon rains affect over 64% of India’s population dependent on agriculture
✅ Only 55% of sown land is irrigated; rest depends on rain
✅ SW Monsoon (June–Sept) gives 75% of annual rain; essential for crops like rice, cotton
✅ NE Monsoon (Oct–Dec) benefits Tamil Nadu, SE coast
✅ Key drivers: ITCZ, El Niño (weakens rain), La Niña (boosts rain)
✅ Rain varies: Western Ghats & NE >400 cm; Rajasthan <60 cm
✅ Climate change impacts:
• 75% rise in extreme rainfall events (1950–2015)
• 27% rise in dry spells
• 50% rain now falls in just 20–30 hours
✅ IMD Accuracy: 100% accurate monsoon forecast (2021–24), ±5% of LPA
✅ Mission Mausam: 9-vertical weather upgrade mission for a “climate-smart Bharat”
✅ Lightning rising: Shift from NE to Central & Western India
📘 Source: Ministry of Earth Sciences, IMD, Economic Survey 2024-25
📝 Prelims MCQ:
Which of the following is true about El Niño’s impact on India?
A. It strengthens the southwest monsoon
B. It leads to above-normal winter rainfall
C. It weakens monsoon and causes droughts
D. It leads to flooding in central India
Answer: C
📝 Mains GS1/GS3 Question:
Discuss the factors affecting the variability of the Indian Monsoon. How is climate change altering its patterns and consequences?
#GS1 #GS3 #IndianMonsoon #ClimateChange
#Geography #GS1 #prelims
Join @CSE_EXAM
@PIB_UPSC
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🔆 GLOFs in India – Rising Threat of Himalayan Hazards
📍 What are GLOFs?
✅ Glacial Lake Outburst Floods (GLOFs) are sudden, high-magnitude flash floods
✅ Occur when natural dams (ice/moraine/rock debris) holding glacial lakes breach or collapse
✅ Triggered by glacier melting, avalanches, earthquakes, landslides, volcanic activity, etc.
📍 Why is India Vulnerable?
✅ India has 54,000+ glaciers in Hindukush-Himalayan region
✅ Avg. temp rose by 0.28°C per decade (1951–2020) → rapid glacial retreat
✅ Eastern Himalayas face 2x higher GLOF risk than Western Himalayas
✅ Threats are expected to triple by 2050
📍 Major GLOF Events in India
✅ 2023 – South Lhonak Lake flood, Sikkim
✅ 2021 – Chamoli disaster, Uttarakhand (Nanda Devi glacier collapse)
✅ 2013 – Chorabari GLOF, Kedarnath tragedy
📍 Steps Taken by India
✅ NDMA focus on Disaster Risk Reduction (DRR) via CoDRR
✅ WIHG: Glacial lake inventory for Uttarakhand & Himachal
✅ CWC: Monitoring of 902 glacial lakes using satellite data
✅ National GLOF Risk Mitigation Project (NGRMP)
• Implemented in Arunachal, Sikkim, HP, Uttarakhand
• Budget: ₹150 crore
• Focus: Early Warning Systems (EWS), community alerts
✅ EWS deployed via C-DAC, ISRO, SAC Ahmedabad
✅ Risk Indexing of glacial lakes to rank high-risk zones
#GLOF #disaster_management #ClimateChange #GS3 #Geography
📍 What are GLOFs?
✅ Glacial Lake Outburst Floods (GLOFs) are sudden, high-magnitude flash floods
✅ Occur when natural dams (ice/moraine/rock debris) holding glacial lakes breach or collapse
✅ Triggered by glacier melting, avalanches, earthquakes, landslides, volcanic activity, etc.
📍 Why is India Vulnerable?
✅ India has 54,000+ glaciers in Hindukush-Himalayan region
✅ Avg. temp rose by 0.28°C per decade (1951–2020) → rapid glacial retreat
✅ Eastern Himalayas face 2x higher GLOF risk than Western Himalayas
✅ Threats are expected to triple by 2050
📍 Major GLOF Events in India
✅ 2023 – South Lhonak Lake flood, Sikkim
✅ 2021 – Chamoli disaster, Uttarakhand (Nanda Devi glacier collapse)
✅ 2013 – Chorabari GLOF, Kedarnath tragedy
📍 Steps Taken by India
✅ NDMA focus on Disaster Risk Reduction (DRR) via CoDRR
✅ WIHG: Glacial lake inventory for Uttarakhand & Himachal
✅ CWC: Monitoring of 902 glacial lakes using satellite data
✅ National GLOF Risk Mitigation Project (NGRMP)
• Implemented in Arunachal, Sikkim, HP, Uttarakhand
• Budget: ₹150 crore
• Focus: Early Warning Systems (EWS), community alerts
✅ EWS deployed via C-DAC, ISRO, SAC Ahmedabad
✅ Risk Indexing of glacial lakes to rank high-risk zones
📝 Prelims Question (2025)
Q. Consider the following statements regarding Glacial Lake Outburst Floods (GLOFs):
1. GLOFs only occur due to volcanic activity in high altitudes.
2. Eastern Himalayas are more vulnerable to GLOFs than the Western Himalayas.
3. NDMA has launched a dedicated National GLOF Risk Mitigation Programme.
Which of the above is/are correct?
(a) 2 and 3 only
(b) 1 and 2 only
(c) 1 and 3 only
(d) 2 only
✅ Answer: (a)
📝 Mains Question (GS3 – Disaster Management)
Q. Examine the rising vulnerability of India’s Himalayan region to Glacial Lake Outburst Floods (GLOFs). What proactive steps has the government taken to mitigate GLOF risks?
#GLOF #disaster_management #ClimateChange #GS3 #Geography
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🔆 North America’s Impact on Indian Monsoon
✅ Climate models show North America strengthens South Asian monsoon rainfall.
✅ Summer warming alters global air circulation, boosts North Pacific high-pressure system, and shifts the Hadley circulation.
✅ This drives moisture-laden winds towards Asia, enhancing rainfall.
✅ For India, North America’s role may even outweigh Tibet’s influence.
🔆 Türkiye Earthquakes (Feb 2023) 🌍
✅ Quakes disturbed regions 1,000 km away in the West Caspian.
✅ Satellite + seismic data showed mud volcano eruptions & fault slips.
✅ Energy released = magnitude 6.1 quake.
✅ Many sites near hydrocarbon fields, linking crust fluids & fault activity.
#Monsoon #ClimateChange #Earthquake #Geography
✅ Climate models show North America strengthens South Asian monsoon rainfall.
✅ Summer warming alters global air circulation, boosts North Pacific high-pressure system, and shifts the Hadley circulation.
✅ This drives moisture-laden winds towards Asia, enhancing rainfall.
✅ For India, North America’s role may even outweigh Tibet’s influence.
🔆 Türkiye Earthquakes (Feb 2023) 🌍
✅ Quakes disturbed regions 1,000 km away in the West Caspian.
✅ Satellite + seismic data showed mud volcano eruptions & fault slips.
✅ Energy released = magnitude 6.1 quake.
✅ Many sites near hydrocarbon fields, linking crust fluids & fault activity.
#Monsoon #ClimateChange #Earthquake #Geography
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