我國東部夏季降水季節(jié)內振蕩與低頻大氣環(huán)流演變特征分析

doi:10.3969/2020jms.0068

首頁 > 過刊瀏覽>2020年第40卷第5期 >686-696. DOI:10.3969/2020jms.0068

我國東部夏季降水季節(jié)內振蕩與低頻大氣環(huán)流演變特征分析
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                        10.3969/2020jms.0068
                    
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中圖分類號:P466
基金項目:國家重點研發(fā)計劃（2018YFC1505900）；創(chuàng)新研究群體項目（41621005）

Characteristics of intra-seasonal oscillation of summer precipitation in eastern China and its related low frequency atmospheric circulation

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利用1979—2017年夏季逐日氣象數據，使用經驗正交函數（Empirical Orthogonal Function，EOF）分解和超前滯后回歸方法分析了我國東部地區(qū)夏季降水季節(jié)內振蕩（Intra-seasonal Oscillation，ISO）的時空特征及其與低緯和北太平洋中高緯度低頻大氣環(huán)流的聯系。結果表明：EOF分解的第一模態(tài)表現為我國東南部地區(qū)ISO降水顯著偏多，而我國北方地區(qū)偏少的空間型，相應的低頻向外長波輻射（Outgoing Long wave Radiation，OLR）場表現為我國東南部地區(qū)低頻對流異?；钴S，而北方地區(qū)異常不活躍的南北偶極子型分布。位于南海至副熱帶西太平洋上空的低頻對流異常活躍區(qū)與低頻上升氣流和低頻水汽輻合帶協(xié)同北傳和西北傳，在我國東南部地區(qū)ISO降水異常偏多位相峰值之前一周抵達華南上空，我國東部地區(qū)ISO降水開始呈現出南北偶極子空間型；與此同時，200 hPa低頻經向風在北太平洋中高緯度表現為一個緯向低頻波列形式，并向西傳播，當低頻波列中的低頻南風異常西傳到東亞—日本島上空時，與低緯北傳的高層異常北風形成經向對比，造成我國東南部地區(qū)上空出現強的低頻散度異常。以上低緯度低頻信號西北傳與北太平洋中高緯度低頻波列西傳的協(xié)同作用，使得異?；钴S的對流活動、水汽異常輻合區(qū)、異常上升運動和高層異常輻散區(qū)均錨定在我國東南部上空，形成該地區(qū)ISO降水異常偏多位相。

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Based on the meteorological daily data from 1979 to 2017, the spatial and temporal characteristics of the Intra-seasonal Oscillation (ISO) of summer precipitation in eastern China and its relationship with low-frequency atmospheric circulation in the low and middle-high latitudes North Pacific were analyzed by using Empirical Orthogonal Function(EOF) and lead-lag regression method. The first EOF mode shows that the ISO precipitation in southeastern China is above-normal and that in northern China is below-normal. The low frequency Outgoing Longwave Radiation (OLR) field indicates more active convection activity in southeastern China and less one in northern China. The anomalous low-frequency convective zone, located between the South China Sea and the subtropical western Pacific Ocean, propagates northward and northwestward, together with the low-frequency updraft and the low-frequency water vapor convergence zone. They arrive at south China one week before the positive phase peak of ISO precipitation in southeast China. The ISO precipitation in eastern China begins to show the north-south dipole pattern. At the same time, the low-frequency meridional wind at 200 hPa shows a zonal wave-train in the middle-high latitudes North Pacific. This low-frequency wave-train propagates westward. When a south wind anomaly among the wave-trains move to the region over East Asia—Japan Island, a meridional contrast is formed between it and the north wind anomaly which originates from the low latitude. This pattern results in a strong low-frequency divergence anomaly over southeast China. The northwestward propagation of the above low-frequency signals in the low latitudes cooperates with the westward propagation of low-frequency wave-train in the mid-high latitudes North Pacific. Thus, the above-normal convection activity, water vapor convergence, upward motion and high-level divergence anomaly are anchored over the southeastern China, contributing to the positive phase of ISO precipitation locally.

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任雪娟,房佳蓓,楊修群.我國東部夏季降水季節(jié)內振蕩與低頻大氣環(huán)流演變特征分析.氣象科學,2020,40(5):686-696 REN Xuejuan, FANG Jiabei, YANG Xiuqun. Characteristics of intra-seasonal oscillation of summer precipitation in eastern China and its related low frequency atmospheric circulation. Journal of the Meteorological Sciences,2020,40(5):686-696

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收稿日期:2020-07-14
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在線發(fā)布日期: 2020-11-07
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