The speeds of both Arctic surface warming and sea-ice shrinking have accelerated over recent decades. However, the causes of this unprecedented phenomenon remain unclear and are subjects of considerable debate. In this study, we report strong observational evidence, for the first time from long-term (1984–2014) spatially complete satellite records, that increased cloudiness and atmospheric water vapor in winter and spring have caused an extraordinary downward longwave radiative flux to the ice surface, which may then amplify the Arctic wintertime ice-surface warming. In addition, we also provide observed evidence that it is quite likely the enhancement of the wintertime greenhouse effect caused by water vapor and cloudiness has advanced the time of onset of ice melting in mid-May through inhibiting sea-ice refreezing in the winter and accelerating the pre-melting process in the spring, and in turn triggered the positive sea-ice albedo feedback process and accelerated the sea ice melting in the summer.
Enhanced wintertime greenhouse effect reinforcing Arctic amplification and initial sea-ice melting
Yunfeng Cao,S. Liang,Xiaona Chen,T. He,Dongdong Wang,Xiao Cheng
Published 2017 in Scientific Reports
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- Publication year
2017
- Venue
Scientific Reports
- Publication date
2017-08-16
- Fields of study
Medicine, Physics, Environmental Science
- Identifiers
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- Source metadata
Semantic Scholar, PubMed
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