不同冷暖背景下影響云南冬季溫度異常的環(huán)流特征

doi:10.12306/2023jms.0025

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不同冷暖背景下影響云南冬季溫度異常的環(huán)流特征
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                        10.12306/2023jms.0025
                    
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中圖分類號:P423;P434
基金項目:國家自然科學(xué)基金資助項目(U1902209);云南省基礎(chǔ)研究專項重點基金資助項目(202201AS070069)

Circulation characteristics influencing winter temperature anomalies in Yunnan during cold and warm periods

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利用1961—2019年云南省122站逐月氣溫、ERA5再分析和大氣環(huán)流指數(shù)等資料,首先分析了云南省冬季氣溫的變化特征,表明云南冬季氣溫存在顯著的增暖趨勢,1996年的暖突變之前為冷期,之后為暖期。進(jìn)一步分析冷期和暖期背景下冷、暖異常年的環(huán)流差異,發(fā)現(xiàn)不同背景下冷(暖)事件發(fā)生時大氣環(huán)流存在顯著差異,表現(xiàn)為暖期背景下冷事件(WC)發(fā)生時東亞東部強(qiáng)冷空氣活動特征比冷期背景下的冷事件(CC)顯著,而冷期背景下暖事件(CW)發(fā)生時呈現(xiàn)的冷空氣偏弱和西南暖濕氣流偏強(qiáng)的特征比暖期背景下暖事件(WW)顯著,即暖期背景需要更強(qiáng)的冷空氣活動才能引發(fā)冷事件,冷期背景下需要來自熱帶更強(qiáng)的西南暖濕氣流才能引發(fā)暖事件。高原高度場、印緬槽強(qiáng)度對云南冷、暖期冬季平均氣溫均有明顯的指示意義。

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Using the monthly temperatures data of 122 stations in Yunnan Province from 1961 to 2019, the ERA5 reanalysis data, and atmospheric circulation indices data, the characteristics of winter temperature variation characteristics in Yunnan were analyzed. Results indicate that there is a very significant warming trend for winter temperatures in Yunnan, with an abrupt warming in 1996. Further analysis of the circulation differences between anomalously cold and warm years during cold and warm periods reveals significant differences in the atmospheric circulation during cold (warm) events in different periods, indicating that the characteristics of strong cold air activity in eastern East Asia during cold events in the warm periods (WC) are more significant than those of cold events in the cold periods (CC), while the characteristics of weak cold air and strong southwest warm-wet airflow during warm events in the cold periods (CW) are more significant than those of warm events in the warm periods (WW). The warm period requires stronger cold air activity to generate the cold event, whereas the cold period requires stronger southwest warm-wet airflow from the tropics to trigger the warm event. During both cold and warm periods, the height field of the plateau and the strength of the Indo-Burmese trough are major indications of the mean winter temperatures in Yunnan.

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馬思源,晏紅明,楊鵬武,羅蒙.不同冷暖背景下影響云南冬季溫度異常的環(huán)流特征.氣象科學(xué),2024,44(6):1072-1083 MA Siyuan, YAN Hongming, YANG Pengwu, LUO Meng. Circulation characteristics influencing winter temperature anomalies in Yunnan during cold and warm periods. Journal of the Meteorological Sciences,2024,44(6):1072-1083

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收稿日期:2023-01-20
最后修改日期:2023-03-02
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在線發(fā)布日期: 2025-01-08
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