大气科学2017，Vol.41Issue(2)：227-235,9.DOI:10.3878/j.issn.1006-9895.1605.16137
一次层积云发展过程对黑潮延伸体海洋锋强迫的响应研究——观测与机制分析
A Study of Stratocumulus Responses to the Kuroshio Extension Front:In-situ Observations and Mechanism
摘要
Abstract
The effect of sea surface temperature (SST) front on the vertical structures of the marine atmospheric boundary layer (MABL) and marine stratiform clouds is not well understood especially on a daily time scale due to the lack of in-situ observations over the ocean.A research vessel,Dongfanghong 2 of Ocean University of China,captured a rapid development of stratocumulus near the Kuroshio Extension (KE) front on 12 April 2014.The cloud top and cloud base increased and the cloud coverage expanded significantly on the warm flank of the front.The present study used a suite of on board observations to analyze the mechanism for the cloud development.The results are as follows.A positive heat flux center formed on the warm flank (downwind) of the KE front due to the slow atmospheric response to the forcing of the KE front.A weak pressure trough that was associated with the heat flux center intensified,leading to vertical motions in the MABL.The turbulent mixing in the MABL was favorable for the downward transport of westerly momentum from aloft to sea surface,which in turn further intensified the surface heat flux.This positive feedback process provided favorable conditions for the increase in the thickness of the mixed layer in MABL and the height of the cloud base/top downwind the KE front.On the other hand,a warm air advection from Honshu,Japan arrived at the heat flux center.The heat flux was combined with the warm advection,producing a pronounced warm center near the surface at 0900-1200 UTC 12 April.This warm center further led to the deepening of the mixing layer,the rising of the cloud base/top and the rapid development of the clouds.This study helps to understand the mechanism of the response of the MABL and the marine stratiform clouds to SST fronts under synoptic disturbances.关键词
海洋锋/海洋大气边界层/层积云/机理Key words
SST front/Marine atmospheric boundary layer (MABL)/Stratocumulus/Mechanism分类
天文与地球科学引用本文复制引用
张苏平,王媛,衣立,刘海坤,王倩..一次层积云发展过程对黑潮延伸体海洋锋强迫的响应研究——观测与机制分析[J].大气科学,2017,41(2):227-235,9.基金项目
国家重大科学研究项目2012CB955600,国家自然科学基金项目41576108,国家自然科学基金委员会—山东省人民政府联合资助海洋科学研究中心项目U1406401,山东省重点研发计划2015GSF120005,青岛市民生科技项目1592114NSH National Basic Research Program of China (Grant 2012CB955600),National Natural Science Foundation of China (NSFC,Grant 41576108),NSFC-Shandong Joint Fund for Marine Science Research Centers (Grant U1406401),Key Research and Development Program of Shandong Province (Grant 2015GSF120005),People's Livelihood Science and Technology Program of Qingdao (Grant 1592114NSH) （Grant 2012CB955600）
