中國東部夏季分區(qū)降水對海溫異常響應(yīng)特征的研究

doi:10.3969/2013jms.0086

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中國東部夏季分區(qū)降水對海溫異常響應(yīng)特征的研究
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                        10.3969/2013jms.0086
                    
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基金項目:公益性行業(yè)(氣象)科研專項(GYHY200906016);國家重點基礎(chǔ)研究發(fā)展計劃(973計劃)項目(2012CB955903);江蘇省高校自然科學重大項目(13KJA170002)

Analysis on response of regional summer rainfall in East China to SST anomaly

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用劉征宇最新發(fā)展的廣義平衡反饋方法結(jié)合經(jīng)驗正交分析和旋轉(zhuǎn)經(jīng)驗正交分析法,研究中國東部6個分區(qū)夏季降水異常對各海盆海溫異常(SSTA)模態(tài)的響應(yīng)特征,探討了東北區(qū)降水異常對SSTA的響應(yīng)機制。結(jié)果表明:各分區(qū)降水異常對SSTA的響應(yīng)特征有明顯差異。東北區(qū)降水異常對熱帶太平洋SSTA的回應(yīng)顯著,當SSTA表現(xiàn)為類似El Niño模時,該區(qū)夏季降水增加;江淮區(qū)降水異常同時受到中緯度以及熱帶SSTA的強迫,對熱帶太平洋SSTA的類似La Niña Modoki模、北大西洋SSTA三極型模等回應(yīng)顯著;西南地區(qū)的降水異常主要與中緯度SSTA有密切關(guān)聯(lián)。對流層高度場對熱帶太平洋SSTA類似El Niño模的直接回應(yīng)在熱帶太平洋上空為顯著正異常。通過東亞—太平洋型遙相關(guān)波列使東北地區(qū)上空高度場出現(xiàn)負異常,并在其西側(cè)形成負異常中心,對流層低層為氣旋性環(huán)流異常。這一環(huán)流回應(yīng)與東北地區(qū)夏季降水偏多時的環(huán)流特征相近。

Abstract:

A method of combining generalized equilibrium feedback assessment developed lately by Liu with Empirical Orthogonal Analysis and Rotated Empirical Orthogonal Analysis is applied to examine the response characteristics of summer precipitation anomaly in six East China climatic regions to sea surface temperature anomaly(SSTA) mode over five basins and to discuss the response mechanism of precipitation anomaly over the Northeast region to SSTA in tropical Pacific. Results show that the response characteristics of anomalous precipitation anomaly over different areas to SSTA are obviously different. In the Northwest region, the precipitation anomaly has a predominant response to the tropical Pacific SSTA, which expresses that when the SSTA pattern is similar to the El Niño mode, the precipitation in summer will increase. In Jianghuai region, the precipitation is robust and is forced by mid-latitude and tropical SSTA, so it has an obvious response to La Niña Modoki mode over the tropical Pacific SSTA and a tripole mode over the North Atlantic SSTA. In addition, the precipitation anomaly over the Southwest region has a close relationship with mid-latitude SSTA. The direct response of geopotential height field in troposphere to similar El Niño mode over the tropic Pacific SSTA is positive anomaly at the tropospheric upper level over the tropic Pacific, and a negative anomaly of upper level geopotential height over the Northeast region occurrs through the East Asia-Pacific (EAP) wave train teleconnection with an anomalous center in the west of the area and a cyclonic circulation anomaly in the low level troposphere. This circulation response is similar to that when the rainfall in Northeast region is above normal.

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李淑娟,余錦華.中國東部夏季分區(qū)降水對海溫異常響應(yīng)特征的研究.氣象科學,2015,35(1):44-51 LI Shujuan, YU Jinhua. Analysis on response of regional summer rainfall in East China to SST anomaly. Journal of the Meteorological Sciences,2015,35(1):44-51

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收稿日期:2013-06-06
最后修改日期:2013-09-30
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在線發(fā)布日期: 2015-03-13
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