華南汛期持續(xù)性降水特征及其與30~90 d大氣低頻振蕩的聯(lián)系

doi:10.12306/2021jms.0059

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華南汛期持續(xù)性降水特征及其與30~90 d大氣低頻振蕩的聯(lián)系
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                        10.12306/2021jms.0059
                    
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中圖分類(lèi)號(hào):P466
基金項(xiàng)目:國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2018YFC1505905）

Characteristics of continuous precipitation during flood season of South China and its relationship with 30-90 day atmospheric low-frequency oscillation

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利用全國(guó)756站逐日降水資料以及NCEP/NCAR再分析資料，研究了1961—2011年我國(guó)東部汛期持續(xù)性降水30~90 d低頻變化特征及其與大氣低頻振蕩的聯(lián)系。結(jié)果表明，華南地區(qū)降水偏多型是汛期持續(xù)性降水低頻變化的主導(dǎo)模態(tài)。對(duì)流層低層位勢(shì)高度負(fù)異常和氣旋型環(huán)流異常，以及高層略向北偏移的環(huán)流異常為華南汛期持續(xù)性降水低頻變化提供了大尺度形勢(shì)場(chǎng)。當(dāng)西太平洋副熱帶高壓脊線(xiàn)維持在22°N附近時(shí)，來(lái)自孟加拉灣和南海的水汽輸送維持了華南地區(qū)汛期持續(xù)性降水活躍位相，向東北傳播的副熱帶大氣低頻振蕩系統(tǒng)對(duì)華南汛期持續(xù)性降水具有調(diào)制作用。此外，華南汛期降水低頻變化還具有南北遷移的經(jīng)向演變特征。

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Based on the daily precipitation data of 756 stations in China and NCEP/NCAR reanalysis data, the low-frequency variation characteristics of 30-90 d continuous precipitation in eastern China during flood season from 1961 to 2011 and its relationship with atmospheric low-frequency oscillation (LFO) are studied. The results show that the more frequent precipitation pattern is the dominant mode of the low frequency variation of the continuous precipitation in flood season in South China (SC). The negative geopotential height anomaly and cyclonic circulation anomaly in the lower troposphere and the circulation anomaly slightly shifted northward in the upper troposphere provide large-scale situation field for the low-frequency variation of continuous precipitation in flood season in SC. When the ridge line of the western Pacific subtropical high(WPSH) maintains around 22°N, the water vapor transport from the Bay of Bengal and South China Sea maintains the active phase of continuous precipitation in flood season in SC, and the LFO system of the subtropical atmosphere spreading to the northeast has a modulating effect on the continuous precipitation in flood season in SC. In addition, the low frequency variation of precipitation in flood season in SC also has the evolution characteristics of north-south migration.

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魯圍,朱益民,哈瑤.華南汛期持續(xù)性降水特征及其與30~90 d大氣低頻振蕩的聯(lián)系.氣象科學(xué),2023,43(2):207-214 LU Wei, ZHU Yimin, HA Yao. Characteristics of continuous precipitation during flood season of South China and its relationship with 30-90 day atmospheric low-frequency oscillation. Journal of the Meteorological Sciences,2023,43(2):207-214

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收稿日期:2021-04-03
最后修改日期:2021-06-22
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在線(xiàn)發(fā)布日期: 2023-05-20
出版日期: 2023-04-15

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