熱帶氣旋Haiyan(2013)快速增強(qiáng)過(guò)程內(nèi)核渦度變化機(jī)制的數(shù)值模擬研究

doi:10.3969/2016jms.0030

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熱帶氣旋Haiyan(2013)快速增強(qiáng)過(guò)程內(nèi)核渦度變化機(jī)制的數(shù)值模擬研究
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                        10.3969/2016jms.0030
                    
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基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目（41575083，41575108）；國(guó)家科技支撐計(jì)劃（2012BAC21B02）

Numerical simulation on change mechanism of the inner-core vorticity in the rapid intensification of tropical cyclone Haiyan(2013)

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選取西北太平洋熱帶氣旋Haiyan（2013）為研究對(duì)象，利用中尺度數(shù)值模式WRF對(duì)其快速增強(qiáng)（RI）過(guò)程進(jìn)行了高時(shí)空分辨率的數(shù)值模擬，推導(dǎo)出一個(gè)包含不同尺度系統(tǒng)相互作用的垂直渦度診斷方程來(lái)探究TC內(nèi)核區(qū)域相對(duì)渦度的變化特征及其與RI的聯(lián)系。診斷結(jié)果表明：渦旋尺度散度項(xiàng)（stre2）、傾斜項(xiàng)（tilt2）和垂直平流項(xiàng)（advv2）對(duì)渦度收支的影響最為重要。RI開(kāi)始前，stre2在邊界層內(nèi)對(duì)渦度收支為正貢獻(xiàn)，邊界層之上則為負(fù)貢獻(xiàn)；tilt2在低層促進(jìn)渦度增加；advv2分布與stre2相反，在低層為負(fù)值，高層為正值。RI開(kāi)始后，stre2在低層（高層）對(duì)渦度的正（負(fù)）貢獻(xiàn)顯著增強(qiáng)；tilt2在低層（高層）對(duì)渦度的促進(jìn)（抑制）作用明顯增強(qiáng)，但在中層出現(xiàn)正負(fù)貢獻(xiàn)相互交替的情況；advv2在低層對(duì)渦度的正貢獻(xiàn)也有所增強(qiáng)。

Abstract:

Mesoscale numerical model WRF (Weather Research and Forecasting) was used to numerically simulate the Rapid Intensification (RI) process of Tropical Cyclone (TC) Haiyan (2013) over Northwest Pacific at high space-time resolution. A vertical vorticity diagnostic equation involving the interaction among systems with different scales was deduced to investigate the variation mechanism of inner-core vorticity of TC and its relation with RI process. Results show that vortex-scale stretching term (stre2), tilting term (tilt2) and vertical-advection term (advv2) play the most important role in vorticity tendency. Before the onset of RI process,the stre2 contributes to the generation of vorticity in the boundary layer, but it tends to suppress above the layer;the tilt2 promotes the vorticity tendency in lower atmosphere layers; the distribution of the advv2 is approximately contrary to that of the stre2. After the onset of RI process,the positive (negative) contribution of stre2 to vorticity tendency tends to strengthen at low (upper) levels;the tilt2 has more robust low-level upgrading influence as well as stronger upper-level reducing influence in company with the alternately positive effect and negative effect at mid-levels;the positive contribution of the advv2 is able to enhance at low levels.

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孫磊,余錦華.熱帶氣旋Haiyan(2013)快速增強(qiáng)過(guò)程內(nèi)核渦度變化機(jī)制的數(shù)值模擬研究.氣象科學(xué),2017,37(2):213-221 SUN Lei, YU Jinhua. Numerical simulation on change mechanism of the inner-core vorticity in the rapid intensification of tropical cyclone Haiyan(2013). Journal of the Meteorological Sciences,2017,37(2):213-221

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收稿日期:2015-12-10
最后修改日期:2016-04-09
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在線發(fā)布日期: 2017-05-16
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抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说