南亞高壓和西太副高位置與中國盛夏降水異常

doi:10.3969/2012jms.00**

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南亞高壓和西太副高位置與中國盛夏降水異常
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                        10.3969/2012jms.00**
                    
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中圖分類號(hào):P434.5
基金項(xiàng)目:2005年江蘇省“六大人才高峰”項(xiàng)目,教育部留學(xué)回國人員科研啟動(dòng)基金

South Asian high and the subtropical western Pacific high and its relation to the mid-summer precipitation anomalies over China

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用全國160站降水資料及ECMWF逐月再分析資料,采用合成分析方法,討論了年際變化尺度上南亞高壓與西太副高緯向位置異常與盛夏降水的關(guān)系。結(jié)果表明,當(dāng)南亞高壓與西太副高緯向異常重疊(分離)時(shí),長江中下游流域存在異常上升(下沉)運(yùn)動(dòng),江南的廣大地區(qū)存在異常下沉(上升)運(yùn)動(dòng)。且當(dāng)兩個(gè)高壓緯向異常重疊時(shí),來自北印度洋及西太平洋的水汽,在長江中下游流域異常輻合,降水偏多。此時(shí),江南地區(qū)水汽通量異常輻散,降水偏少。當(dāng)兩個(gè)高壓緯向異常分離時(shí),水汽主要來自北印度洋的西南風(fēng)輸送,長江流域降水偏少,江南地區(qū)降水偏多。

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Based on the monthly precipitation of 160 stations in China and the ECMWF monthly reanalyses, the relationship between the longitudinal location anomalies of the South Asian high (SAH) and the Subtropical Western Pacific high (SWPH) and the mid-summer precipitation anomalies over China has been investigated by using the composite analysis. The results show that when the longitudinal location of the SAH (SWPH) moves further eastward (westward) than normal, both anticyclones (SAH and SWPH) overlap in the east-west direction on the basis of interannual variation, the anomalous ascending motion appears in the middle and lower Yangtze valley, while the anomalous descending motion occurs in the south China. The moisture from the northern Indian Ocean and South China Sea converged in the middle and lower Yangtze valley, which leads to abundant precipitation over the middle and lower Yangtze valley. As the SAH and the SWPH overlap over the south China, the abnormal moisture divergence occurs, which leads to scarce precipitation. When the SAH and the SWPH move further apart from each other than usual on the basis of interannual variation, the moisture comes mainly from the northern Indian Ocean, and anomalous ascending motion and more precipitation occur over south China. At the same time, abnormal descending motion and less precipitation occur over the middle and lower Yangtze valley.

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張玲,智協(xié)飛.南亞高壓和西太副高位置與中國盛夏降水異常.氣象科學(xué),2010,(4):438-444 Zhang Ling, Zhi Xiefei. South Asian high and the subtropical western Pacific high and its relation to the mid-summer precipitation anomalies over China. Journal of the Meteorological Sciences,2010,(4):438-444

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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