Severe winter weather as a response to the lowest Arctic sea-ice anomalies |
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| Authors: | CHEN Hongxi LIU Na and ZHANG Zhanhai |
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| Institution: | 1.Key Laboratory of Marine Science and Numerical Modeling, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China2.Key Laboratory for Polar Science, Polar Research Institute of China, State Oceanic Administration, Shanghai 200136, China |
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| Abstract: | Possible impact of reduced Arctic sea-ice on winter severe weather in China is investigated regarding the snowstorm over southern China in January 2008. The sea-ice conditions in the summer (July–September) and fall (September–November) of 2007 show that the sea-ice is the lowest that year. During the summer and fall of 2007, sea ice displayed a significant decrease in the East Siberian, the northern Chukchi Sea, the western Beaufort Sea, the Barents Sea, and the Kara Sea. A ECHAM5.4 atmospheric general circulation model is forced with realistic sea-ice conditions and strong thermal responses with warmer surface air temperature and higher-than-normal heat flux associated with the sea-ice anomalies are found. The model shows remote atmospheric responses over East Asia in January 2008, which result in severe snow storm over southern China. Strong water-vapor transported from the Bay of Bengal and from the Pacific Ocean related to Arctic sea-ice anomalies in the fall (instead of summer) of 2007 is considered as one of the main causes of the snowstorm formation. |
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| Keywords: | Arctic sea ice severe winter weather ECHAM5 4 atmospheric general circulation model |
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