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《气象学报(英文版)》 2015-03
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Numerical Study of the Evolution of a Sea-Breeze Front Under Two Environmental Flows

LIANG Zhaoming;WANG Donghai;State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences;  
The evolution of a sea-breeze front(SBF) in parallel and offshore environmental flows was investigated by using high-resolution simulations of two SBF cases from the Bohai Bay region,China.The results show that the combination of a distinct vertical wind shear caused by the sea-breeze circulation with a neutral or slightly stable atmospheric stratification associated with the thermal inner boundary layer promoted the occurrence and maintenance of a Kelvin-Helmholtz billow(KHB).In a parallel environmental flow,the SBF evolved into a few connected segments because of the inhomogeneity of the sea-breeze direction and intensity as it penetrated inland.A significant upward vertical motion occurred at the two ends of the SBF segment owing to the sea-breeze convergence and was accelerated by the KHB.The KHB made a notable contribution to the intensity at the ends of the segment,whereas the intensity at the middle segment was primarily attributed to the convergence between the sea breeze and the parallel flow.In the offshore environmental flow,the clockwise rotation of the offshore flow varying with time increased the downstream convergence of the interface between the sea breeze and the offshore flow and pushed the downstream convergence zone to an orientation consistent with the offshore flow.The air parcels ascending from the downstream part of the SBF were continuously lifted by the downstream convergence zone during their advection,leading to a significant downstream development of the SBF.The significant upward vertical motion caused by the sea-breeze convergence behind the upstream end of the SBF was shifted to the upstream end of the SBF by the KHB,which enhanced the intensity of the upstream end of the SBF.
【Fund】: Supported by the China Meteorological Administration Special Public Welfare Research Fund(GYHY201306009);; Fundamental Research Funds for Chinese Academy of Meteorological Sciences(2013Y008)
【CateGory Index】: P732
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