亞洲季風(fēng)區(qū)不同形態(tài)中尺度對(duì)流系統(tǒng)的特征分析

doi:10.3969/2016jms.0037

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亞洲季風(fēng)區(qū)不同形態(tài)中尺度對(duì)流系統(tǒng)的特征分析
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                        10.3969/2016jms.0037
                    
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基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目（41230421）；國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（973計(jì)劃）項(xiàng)目（2013CB430101）

Characteristics of mesoscale convective system in different morphologies over the Asian monsoon region

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利用16 a的TRMM衛(wèi)星觀測(cè)資料，分析了亞洲季風(fēng)區(qū)準(zhǔn)圓狀、線狀和拉長(zhǎng)狀中尺度對(duì)流系統(tǒng)（MCSs）的空間分布、對(duì)流屬性及其區(qū)域變化特征。結(jié)果表明：拉長(zhǎng)狀MCSs的數(shù)量最多，準(zhǔn)圓狀的其次而線狀的最少。自西向東，準(zhǔn)圓狀（線狀）MCSs數(shù)量占各區(qū)域MCSs總數(shù)的比例逐漸減?。ㄔ黾樱€狀MCSs在副熱帶和洋面地區(qū)的產(chǎn)生幾率相比更大。MCSs的發(fā)生頻次呈現(xiàn)以暖季（5—9月）為峰值的單峰分布，準(zhǔn)圓狀和拉長(zhǎng)狀MCSs的暖季峰值比線狀MCSs的大。MCSs主要發(fā)生在下午—傍晚時(shí)段，但線狀MCSs在午夜—凌晨出現(xiàn)的概率比其它兩種大。3種類型MCSs的整體強(qiáng)度基本表現(xiàn)為副熱帶地區(qū)弱于近熱帶地區(qū)，但不同類型MCSs的強(qiáng)度差異在各區(qū)域不盡相同，如中國(guó)中東部地區(qū)和西北太平洋地區(qū)的準(zhǔn)圓狀MCSs強(qiáng)度最強(qiáng)，但東海及其以東洋面的線狀MCSs強(qiáng)度最強(qiáng)。

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Based on the 16-year TRMM satellite data, the spatial distributions, convective properties and their regional variations of quasi-circular, line shaped, and elongated Mesoscale Convective Systems (MCSs) were investigated. Results reveal that the elongated MCSs account for a majority of total MCSs, followed by the quasi-circular and line shaped MCSs. Overall, the line shaped MCSs preferentially occur in the subtropics and over the oceans. The ratio of quasi-circular (line shaped) MCSs to the total MCSs shows a zonal decreasing (increasing) from the west to the east over the subregion. Although the MCSs predominantly occur in the warm seasons (May-September), the quasi-circular and elongated MCSs are more concentrated than the line shaped MCSs. Besides, the occurrences of MCSs are mainly concentrated in the late afternoon, but the ratio of line shaped MCSs occurring in the midnight to dawn is higher than the other two types. From the mean states of convective proxies, MCSs in the subtropics possess weaker convective intensities than those in the tropics. However, the intensities of MCSs depend on different morphologies. For example, the quasi-circular MCSs exhibit stronger convective intensities than the line shaped and elongated MCSs over the central East China and western North Pacific, but the line shaped MCSs show stronger convective intensities than the other two types over the oceanic regions in the east of China.

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陽向榮,費(fèi)建芳,黃小剛,程小平,何宏讓.亞洲季風(fēng)區(qū)不同形態(tài)中尺度對(duì)流系統(tǒng)的特征分析.氣象科學(xué),2017,37(4):436-449 YANG Xiangrong, FEI Jianfang, HUANG Xiaogang, CHENG Xiaoping, HE Hongrang. Characteristics of mesoscale convective system in different morphologies over the Asian monsoon region. Journal of the Meteorological Sciences,2017,37(4):436-449

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收稿日期:2016-03-01
最后修改日期:2016-05-24
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在線發(fā)布日期: 2017-09-20
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