季節(jié)—年際歷史回報(bào)數(shù)據(jù)中北大西洋海溫異常影響東亞氣候的兩種途徑

doi:10.12306/2023jms.0087

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季節(jié)—年際歷史回報(bào)數(shù)據(jù)中北大西洋海溫異常影響東亞氣候的兩種途徑
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                        10.12306/2023jms.0087
                    
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中圖分類號(hào):P461.2
基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目(42088101;42030605)

Two pathways of the impact of the North Atlantic SSTA on East Asian climate in the seasonal-annual hindcasts

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本文基于1980—2005年ENSEMBLES(Ensemble-based Predictions of Climate Changes and their Impact)季節(jié)—年際多模式歷史回報(bào)數(shù)據(jù)和20世紀(jì)耦合季節(jié)預(yù)測(cè)(CSF-20C)回報(bào)數(shù)據(jù)的月平均海溫、地表氣溫、降水、風(fēng)場(chǎng)及位勢(shì)高度場(chǎng)資料,利用依賴月份的集合成員間奇異值分解方法研究了北大西洋海溫異常影響東亞氣候的兩種途徑。結(jié)果表明,春、夏季熱帶北大西洋海溫暖異常與西南風(fēng)異常密切耦合,暖中心由春至夏季加強(qiáng)西移,該暖海溫異常能夠激發(fā)東傳的Kelvin,造成夏季西北太平洋異常反氣旋顯著增強(qiáng),促進(jìn)了中南半島北部、日本南部及我國(guó)南方大部的降水增長(zhǎng)。而中高緯度北大西洋海溫在春季呈現(xiàn)東北暖、西南冷的偶極子型異常,該海溫異常通過(guò)與風(fēng)場(chǎng)的強(qiáng)烈耦合,激發(fā)了遙相關(guān)波列,影響烏拉爾山阻塞高壓及東亞大槽,造成東北亞地區(qū)的低壓異常,導(dǎo)致了朝鮮半島、日本大部及我國(guó)東部的氣溫降低。

Abstract:

By using the monthly mean Sea Surface Temperature (SST), near surface air temperature, precipitation, wind and geopotential height data of the ENSEMBLES and Coupled Seasonal Forecasts of the 20th Century(CSF-20C)seasonal-annual hindcasts from 1980 to 2005, two pathways of the impact of North Atlantic SSTA on East Asian climate were studied. Results show that the tropical North Atlantic SSTAs are coupled closely with the southwest wind anomaly in spring and summer, with the warming center strengthening and moving westward. The SST warming stimulates the eastward Kelvin wave, which causes the significant enhancement of the western North Pacific anticyclone in summer, and increases the precipitation in northern Indo-China Peninsula, southern Japan and most of southern China. However, the SSTAs of mid-high latitude North Atlantic exhibit a dipole in spring, with SST warming in the northeast and cooling in the southwest.The SSTA stimulates the teleconnection wave through the strong coupling with the wind,affecting the Ural Blocking High and East Asian trough, which causes a low pressure anomaly in Northeast Asia, and promotes a decrease in air temperature over the Korean Peninsula, Japan and eastern China.

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蔣睿晟,馬靜.季節(jié)—年際歷史回報(bào)數(shù)據(jù)中北大西洋海溫異常影響東亞氣候的兩種途徑.氣象科學(xué),2024,44(5):814-824 JIANG Ruisheng, MA Jing. Two pathways of the impact of the North Atlantic SSTA on East Asian climate in the seasonal-annual hindcasts. Journal of the Meteorological Sciences,2024,44(5):814-824

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收稿日期:2023-08-17
最后修改日期:2023-12-14
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在線發(fā)布日期: 2024-11-21
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