本文關(guān)鍵詞： 海洋鋒 海洋大氣邊界層 層積云 機(jī)理 數(shù)值模擬　出處：《中國(guó)海洋大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年07期 　論文類(lèi)型：期刊論文

【摘要】：2014年4月12日,中國(guó)海洋大學(xué)東方紅2號(hào)調(diào)查船在黑潮延伸體海區(qū)由暖水側(cè)向北穿越海洋鋒時(shí),捕捉到了一次層積云云底和云頂高度升高的過(guò)程。本文利用船測(cè)數(shù)據(jù)結(jié)合WRF模式進(jìn)行數(shù)值模擬和試驗(yàn),對(duì)此次層積云迅速發(fā)展的機(jī)理進(jìn)行了綜合分析。結(jié)果顯示,在黑潮延伸體區(qū)域,西北風(fēng)控制下,海洋鋒和來(lái)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(guò)數(shù)值試驗(yàn)發(fā)現(xiàn),海洋鋒作為背景場(chǎng),為該區(qū)域提供了200W·m~(-2)的潛熱通量并導(dǎo)致氣壓下降,從而在暖水側(cè)產(chǎn)生了0.05m·s~(-1)的上升運(yùn)動(dòng)。同時(shí),來(lái)自日本本州島陸地的暖平流作為日尺度擾動(dòng),在09-12UTC到達(dá)潛熱通量中心,導(dǎo)致該時(shí)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(guò)局地海氣相互作用,使得該時(shí)段該區(qū)域垂直運(yùn)動(dòng)異常增強(qiáng),進(jìn)而造成云的異常發(fā)展。本研究有助于理解在復(fù)雜大氣背景擾動(dòng)擾動(dòng)下MABL對(duì)海洋強(qiáng)迫的響應(yīng)機(jī)理,同時(shí)對(duì)于理解海洋對(duì)邊界層的影響又反饋到海洋的過(guò)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(hào)：1444178