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Recent upper Arctic Ocean warming expedited by summertime atmospheric processes.
Zhe Li1, Qinghua Ding2, Michael Steele3
1Department of Geography, and Earth Research Institute, University of California, Santa Barbara, Santa Barbara, CA, USA.
Nature Communications
|January 19, 2022
Summary
Arctic Ocean warming is influenced by atmospheric circulation changes. Internal variability, not just human activity, significantly impacts ocean temperatures, especially in recent decades.
Area of Science:
- Climatology
- Oceanography
- Atmospheric Science
Background:
- Arctic Ocean warming (0-50m) since 1979 is largely attributed to anthropogenic high-latitude changes.
- Sea ice-albedo feedback is a key mechanism influencing Arctic climate dynamics.
Purpose of the Study:
- To investigate the role of internal atmospheric variability in Arctic Ocean warming.
- To quantify the contribution of atmospheric dynamics to upper Arctic Ocean temperature trends.
Main Methods:
- Analysis of observational data and climate model simulations.
- Atmospheric circulation nudging experiments to isolate internal variability effects.
Main Results:
- A multiyear trend in summertime atmospheric circulation significantly contributes to upper Arctic Ocean warming in summer and fall.
- Internal variability accounts for up to 25% of Arctic Ocean warming over four decades and 60% from 2000-2018.
- Sea ice-albedo effect, driven by atmospheric dynamics, is a key mechanism.
Conclusions:
- Internal atmospheric variability plays a crucial role in Arctic Ocean warming, alongside anthropogenic factors.
- Climate models must accurately simulate internal atmospheric processes for realistic Arctic temperature trend simulations.
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