基于本征微觀態(tài)方法探究全球地表氣壓變化特征及其與降水的聯(lián)系

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基于本征微觀態(tài)方法探究全球地表氣壓變化特征及其與降水的聯(lián)系
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基金項(xiàng)目:國家自然科學(xué)基金資助項(xiàng)目(42305075;12135003;41975047);2022年博士后創(chuàng)新人才支持計(jì)劃資助項(xiàng)目(BX20220039);中國博士后科學(xué)基金(2023M730301);國家重點(diǎn)研發(fā)計(jì)劃資助項(xiàng)目(2023YFE0109000)

Exploring the characteristics of global surface pressure variations and their relationship with precipitation based on the eigen microstate method

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利用ERA5和GPCP再分析資料及NOAA提供的氣候指數(shù),基于本征微觀態(tài)和傳統(tǒng)氣象學(xué)方法,探討了全球1950—2022年地表氣壓變化特征及其與全球降水和環(huán)流變化之間的關(guān)系。結(jié)果表明:全球地表氣壓的第一大本征微觀態(tài)主要以南極一致性變化為主,與南極濤動(dòng)顯著相關(guān);第二大本征微觀態(tài)以北極一致性變化為主,與北極濤動(dòng)和北大西洋濤動(dòng)顯著相關(guān);第三大本征微觀態(tài)在熱帶太平洋呈現(xiàn)緯向偶極子結(jié)構(gòu),與厄爾尼諾—南方濤動(dòng)(EI Niño-Southern Oscillation,ENSO)聯(lián)系緊密。不同本征微觀態(tài)對全球降水的影響存在顯著的區(qū)域性差異。第一大本征微觀態(tài)處于正位相時(shí),南極繞極環(huán)流增強(qiáng),南半球高緯度地區(qū)降水增多,中緯度地區(qū)降水減少。第二大本征微觀態(tài)處于正位相時(shí)對應(yīng)北極降水增多,北大西洋及其周邊地區(qū)降水減少。第三大本征微觀態(tài)影響范圍較廣,主要表現(xiàn)為西太平洋降水減少和中東太平洋降水增多。

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By using ERA5,GPCP reanalysis dataset, and climate indices provided by the NOAA, this study discusses the characteristics of global surface pressure changes from 1950 to 2022 and its relationship with global precipitation and circulation changes based on the eigen microstates and traditional meteorological methods. Results show that the first leadingeigen microstate of global surface pressure is dominated by coherent changes in the Antarctic, significantly related to the Antarctic oscillation. The second mode mainly features consistent changes in the Arctic, which is significantly related to the Arctic Oscillation (AO) and North Atlantic Oscillation(NAO). The third mode exhibits an east-west dipole structure in the tropical Pacific, closely related to the El Niño-Southern Oscillation (ENSO). Each mode is primarily characterized by annual variations, and there are significant regional differences in their impacts on global precipitation. When the first mode is in a positive phase, the Antarctic polar vortex strengthens, causing an increase in precipitation in high-latitude regions and a decrease in mid-latitude regions of the Southern Hemisphere. The second mode is closely related to precipitation in the mid-to-high latitudes of the Northern Hemisphere, with its positive phase corresponding to increased Arctic precipitation and decreased precipitation in the North Atlantic and its surrounding areas. The third mode could affect global precipitation, mainly manifested as decreased precipitation in the western Pacific and increased precipitation in the East Central Pacific.

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馬旋,陳曉松,謝飛,夏炎.基于本征微觀態(tài)方法探究全球地表氣壓變化特征及其與降水的聯(lián)系.氣象科學(xué),2024,44(2):349-361 MA Xuan, CHEN Xiaosong, XIE Fei, XIA Yan. Exploring the characteristics of global surface pressure variations and their relationship with precipitation based on the eigen microstate method. Journal of the Meteorological Sciences,2024,44(2):349-361

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收稿日期:2023-09-26
最后修改日期:2023-12-30
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在線發(fā)布日期: 2024-05-17
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