本文關鍵詞： 海洋鋒 海洋大氣邊界層 層積云 機理 數(shù)值模擬　出處：《中國海洋大學學報(自然科學版)》2017年07期 　論文類型：期刊論文

【摘要】：2014年4月12日,中國海洋大學東方紅2號調查船在黑潮延伸體海區(qū)由暖水側向北穿越海洋鋒時,捕捉到了一次層積云云底和云頂高度升高的過程。本文利用船測數(shù)據(jù)結合WRF模式進行數(shù)值模擬和試驗,對此次層積云迅速發(fā)展的機理進行了綜合分析。結果顯示,在黑潮延伸體區(qū)域,西北風控制下,海洋鋒和來自日本本州島陸地的低空暖平流共同作用使得層積云發(fā)展。通過數(shù)值試驗發(fā)現(xiàn),海洋鋒作為背景場,為該區(qū)域提供了200W·m~(-2)的潛熱通量并導致氣壓下降,從而在暖水側產(chǎn)生了0.05m·s~(-1)的上升運動。同時,來自日本本州島陸地的暖平流作為日尺度擾動,在09-12UTC到達潛熱通量中心,導致該時段該區(qū)域2~3℃的增溫和0.5hPa的降壓。但兩者并非單純線性疊加,而是在海洋鋒提供背景條件的前提下,暖平流產(chǎn)生觸發(fā)作用,通過局地海氣相互作用,使得該時段該區(qū)域垂直運動異常增強,進而造成云的異常發(fā)展。本研究有助于理解在復雜大氣背景擾動擾動下MABL對海洋強迫的響應機理,同時對于理解海洋對邊界層的影響又反饋到海洋的過程有一定幫助。
[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，

本文編號：1444178