Antarctic Intermediate Water becoming saltier and denser since 2015 risks releasing stored carbon
GS3Economy · S&T · Environment · Security· Nuclear & new energy technology· Prelims + Mains·
Oceanic salinity and carbon sequestration: a GS3 and Science & Technology case study on climate feedback.
Why in news
Researchers from IISc and international universities found that Antarctic Intermediate Water (AAIW) has become saltier and denser since 2015, risking the release of stored carbon.
Background
A study by IISc, University of Melbourne, and University of Southampton identified a salinity increase of approximately 0.0048 grams per kilogram per decade in AAIW. This change is attributed to declining sea ice and may lead to the release of stored carbon into the atmosphere.
Facts for Prelims
- S&TAAIW: Antarctic Intermediate Water is becoming saltier and denser since 2015.
- FactSalinity increase in AAIW: 0.0048 grams per kilogram per decade.
- EnvironmentCause of salinity increase: Declining sea ice in the Antarctic region.
Prelims practice question
What is the recorded rate of salinity increase in Antarctic Intermediate Water (AAIW) per decade?
- (a)0.0071 grams per kilogram
- (b)0.0032 grams per kilogram
- (c)0.0055 grams per kilogram
- (d)0.0048 grams per kilogram
Show answer
Answer: (d) 0.0048 grams per kilogram — The study identified a salinity increase of approximately 0.0048 grams per kilogram per decade in AAIW.
For Mains
Q. Discuss how changes in oceanographic properties like salinity and density in the Antarctic region contribute to global carbon cycle imbalances and climate change.
Dimensions to cover in your answer
- Carbon feedback loop: Potential release of sequestered carbon from deep ocean waters into the atmosphere
- Cryosphere-Ocean interaction: Impact of declining sea ice on thermohaline circulation and water density
- Oceanic carbon sinks: Risks to the ocean's capacity to act as a global carbon buffer
Keywords: Thermohaline circulation · Carbon sequestration · Cryosphere · Oceanic salinity · Climate feedback
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This note is generated automatically from SatyaDheesh's news feed and mapped to the UPSC CSE syllabus. Check facts against the original report or PIB before using them in an answer.