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——数值模拟和试验

发布时间：2018-01-19 12:27

  本文关键词： 海洋锋 海洋大气边界层 层积云 机理 数值模拟　出处：《中国海洋大学学报(自然科学版)》2017年07期 　论文类型：期刊论文

【摘要】：2014年4月12日,中国海洋大学东方红2号调查船在黑潮延伸体海区由暖水侧向北穿越海洋锋时,捕捉到了一次层积云云底和云顶高度升高的过程。本文利用船测数据结合WRF模式进行数值模拟和试验,对此次层积云迅速发展的机理进行了综合分析。结果显示,在黑潮延伸体区域,西北风控制下,海洋锋和来自日本本州岛陆地的低空暖平流共同作用使得层积云发展。通过数值试验发现,海洋锋作为背景场,为该区域提供了200W·m~(-2)的潜热通量并导致气压下降,从而在暖水侧产生了0.05m·s~(-1)的上升运动。同时,来自日本本州岛陆地的暖平流作为日尺度扰动,在09-12UTC到达潜热通量中心,导致该时段该区域2~3℃的增温和0.5hPa的降压。但两者并非单纯线性叠加,而是在海洋锋提供背景条件的前提下,暖平流产生触发作用,通过局地海气相互作用,使得该时段该区域垂直运动异常增强,进而造成云的异常发展。本研究有助于理解在复杂大气背景扰动扰动下MABL对海洋强迫的响应机理,同时对于理解海洋对边界层的影响又反馈到海洋的过程有一定帮助。
[Abstract]:In April 12th 2014, the survey vessel Dongfanghong No. 2 of Ocean University of China crossed the ocean front from warm water sideways to the north in the Kuroshio extension area. A process of elevation of stratified cloud bottom and cloud top is captured. In this paper, the ship survey data and WRF model are used to carry out numerical simulation and experiment. The mechanism of the rapid development of stratified clouds is comprehensively analyzed. The results show that in the Kuroshio extension area, the northwest wind is controlled. The interaction of ocean front and low level warm advection from Honshu Island, Japan, leads to the development of stratocumulus cloud. Through numerical experiments, it is found that ocean front is the background field. The latent heat flux of 200 W 路m ~ (-1) is provided to this area and the pressure decreases, thus the rising motion of 0.05 m 路s-1) is produced on the warm water side. At the same time. The warm advection from the Honshu land, Japan, as a diurnal disturbance, reached the latent heat flux center at 09-12 UTC. The results show that the temperature increase of 2o 3 鈩，

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