| Impact of sea surface temperature front on stratus-sea fog over the Yellow and East China Seas — a case study with implications for climatology |
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| 作者姓名： | LI Man ZHANG Suping |
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| 作者单位： | Key Laboratory of Physical Oceanography,and Ocean-Atmosphere Interaction and Climate Laboratory,Ocean University of China;Institute of Desert Meteorology,CMA,Urumqi 830002,P.R.China |
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| 基金项目： | We wish to thank Prof. Qinyu Liu for her constructive comments and Jingchao Long, Geng Han for their help with some of the figures. This work is supported by ＇973＇ project 2012CB955602, and NSFC 41175006. |
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| 摘 要： | A stratus-sea fog event that occurred over the Yellow and East China Seas on 3 June 2011 is investigated using observa-tions and a numerical model, with a focus on the effects of background circulation and Sea Surface Temperature Front (SSTF) on the transition of stratus into sea fog. Southerly winds of a synoptic high-pressure circulation transport water vapor to the Yellow Sea, creating conditions favorable for sea fog/stratus formation. The subsidence from the high-pressure contributes to the temperature inversion at the top of the stratus. The SSTF forces a secondary circulation within the ABL (Atmospheric Boundary Layer), the sink-ing branch of which on the cold flank of SSTF helps lower the stratus layer further to reach the sea surface. The cooling effect over the cold sea surface counteracts the adiabatic warming induced by subsidence. The secondary circulation becomes weak and the fog patches are shrunk heavily with the smoothed SSTF. A conceptual model is proposed for the transition of stratus into sea fog over the Yellow and East China Seas. Finally, the analyses suggest that sea fog frequency will probably decrease due to the weakened SSTF and the reduced subsidence of secondary circulation under global warming.
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| 关 键 词： | stratus and sea fog subsidence sea surface temperature front the Yellow and East China Seas global warming |
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