Connecting early summer cloudcontrolled sunlight and late summer sea ice in the Arctic
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- Connecting early summer cloudcontrolled sunlight and late summer sea ice in the Arctic
- Choi, Yong-Sang
- Meteorology & Atmospheric Sciences
- Issue Date
- Choi, Yong-Sang., et al. 2014. Connecting early summer cloud-controlled sunlight and late summer sea ice in the Arctic, Journal of Geophysical Research: Atmospheres, 119(19): 11,087？11,099.
- This study demonstrates that absorbed solar radiation (ASR) at the top of the atmosphere in
early summer (May-July) plays a precursory role in determining the Arctic sea ice concentration (SIC) in
late summer (August-October). The monthly ASR anomalies are obtained over the Arctic Ocean (65°N-90°N)
from the Clouds and the Earth’s Radiant Energy System during 2000-2013. The ASR changes primarily with
cloud variation. We found that the ASR anomaly in early summer is significantly correlated with the SIC
anomaly in late summer (correlation coefficient, r - 0.8 with a lag of 1 to 4 months). The region exhibiting
high (low) ASR anomalies and low (high) SIC anomalies varies yearly. The possible reason is that the solar heat
input to ice is most effectively affected by the cloud shielding effect under the maximum TOA solar radiation
in June and amplified by the ice-albedo feedback. This intimate delayed ASR-SIC relationship is not
represented in most of current climate models. Rather, the models tend to over-emphasize internal sea ice
processes in summer.
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