Northern Hemisphere Lakes May Lose 40 Days of Winter Ice by 2100
UPSC / SSC current affairs note · IR
Why in news
A new international study warns that lake ice across the Northern Hemisphere could shrink by about 40 days by 2100 if emissions remain high. This highlights the accelerating impact of climate change on freshwater ecosystems and communities dependent on stable winter ice.
Background
Winter ice on lakes is crucial for regulating water temperature, supporting aquatic life, and maintaining freshwater ecosystem balance. However, climate warming is causing seasonal ice cover to disappear faster than expected, with significant implications for water quality and local livelihoods.
Key facts
Researchers tracked 724 Northern Hemisphere lakes from 2000 to 2022.
The study found that above critical winter temperatures, ice-loss sensitivity rises up to 22-fold.
If greenhouse gas emissions remain high, lakes could lose around 40 days of winter ice cover by 2100.
Spring ice melt is more sensitive to rising temperatures than autumn freeze-up.
The overall ice-covered season is shrinking more quickly than expected due to faster melting in spring.
The findings were published in the journal Proceedings of the National Academy of Sciences (PNAS).
Prelims pointers
- Study published in PNAS (Proceedings of the National Academy of Sciences).
- Covered 724 lakes in the Northern Hemisphere.
- Data period: 2000-2022.
- Key concept: ice phenology (timing of freeze and melt).
- Critical winter temperature thresholds identified.
- Potential loss: ~40 days of winter ice by 2100 under high emissions.
Mains angles
- Discuss the impact of climate change on freshwater ecosystems and the importance of lake ice.
- Critically examine the implications of reduced lake ice cover for communities and biodiversity.
- Analyze the role of international studies in informing climate policy and adaptation strategies.