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Cold-Season Arctic Amplification Driven by Arctic Ocean-Mediated Seasonal Energy Transfer

Cited 17 time in wos
Cited 16 time in scopus
Cold-Season Arctic Amplification Driven by Arctic Ocean-Mediated Seasonal Energy Transfer
Other Titles
북극 해양의 계절간 에너지 전달과정에 기인하는 북극 온도상승의 증폭현상
Chung, Eui-Seok
Ha, Kyung-Ja
Timmermann, Axel
Stuecker, Malte F.
Bodai, Tamas
Lee, Sang-Ki
Environmental Sciences & EcologyGeologyMeteorology & Atmospheric Sciences
Arctic amplificationlapse­rate feedbackocean heat rechargedischargesea­ice albedo feedbackseasonal evolution
Issue Date
Chung, Eui-Seok, et al. 2021. "Cold-Season Arctic Amplification Driven by Arctic Ocean-Mediated Seasonal Energy Transfer". EARTHS FUTURE, 9(2): 1-17.
The Arctic warming response to greenhouse gas forcing is substantially greater than the rest of the globe. It has been suggested that this phenomenon, commonly referred to as Arctic amplification, and its peak in boreal fall and winter result primarily from the lapse-rate feedback, which is associated with the vertical structure of tropospheric warming, rather than from the sea-ice albedo feedback, which operates mainly in summer. However, future climate model projections show consistently that an overall reduction of sea-ice in the Arctic region leads to a gradual weakening of Arctic amplification, thereby implying a key role for sea-ice albedo feedback. To resolve this apparent contradiction, we conduct a comprehensive analysis using atmosphere/ocean reanalysis datasets and a variety of climate model simulations. We show that the Arctic Ocean acts as a heat capacitor, storing anomalous heat resulting from the sea-ice loss during summer, which then gets released back into the atmosphere during fall and winter. Strong air-sea heat fluxes in fall/winter in sea-ice retreat regions in conjunction with a stably stratified lower troposphere lead to a surface-intensified warming/moistening, augmenting longwave feedback processes to further enhance the warming. The cold-season surface-intensified warming/moistening is found to virtually disappear if ocean-atmosphere-sea ice interactions are suppressed, demonstrating the importance of ice insulation effect and ocean heat uptake/release. These results strongly suggest that the warm-season ocean heat recharge and cold-season heat discharge link and integrate the warm and cold season feedbacks, and thereby effectively explain the predominance of the Arctic amplification in fall and winter.
Appears in Collections  
2020-2020, Earth System Model-based Korea Polar Prediction System (KPOPS-Earth) Development and Its Application to the High-impact Weather Events originated from the Changing Arctic Ocean and Sea Ice (20-20) / Kim, Joo-Hong (PE20090)
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