青藏高原夏季熱力狀態(tài)和南半球大氣環(huán)流的可能聯(lián)系

doi:10.12306/2023jms.0043

首頁 > 過刊瀏覽>2023年第43卷第4期 >427-437. DOI:10.12306/2023jms.0043

青藏高原夏季熱力狀態(tài)和南半球大氣環(huán)流的可能聯(lián)系
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                        10.12306/2023jms.0043
                    
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中圖分類號:P434.1
基金項(xiàng)目:中國科學(xué)院戰(zhàn)略性先導(dǎo)科技專項(xiàng)(A類)(XDA20100308);國家自然科學(xué)基金資助項(xiàng)目(41621005)

Possible relationship between the summer thermal state of the Tibetan Plateau and the atmospheric circulation in the Southern Hemisphere

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本文通過對觀測和再分析數(shù)據(jù)采用最大協(xié)方差分析以及回歸、合成等分析方法,研究了青藏高原夏季地表氣溫與南半球大氣環(huán)流之間的遙相關(guān)關(guān)系。結(jié)果表明,前期(4月)南半球極地—中高緯度大氣環(huán)流呈現(xiàn)負(fù)位勢高度異常、較低緯度印度洋—西太平洋區(qū)域呈現(xiàn)正位勢高度異常時(shí),高原中部和東部大部分區(qū)域夏季出現(xiàn)暖異常。在上述遙相關(guān)中,印度洋—西太平洋海溫異?？赡芷鸬搅酥匾闹虚g橋梁作用。在高原夏季溫度偏高的年份,前期跨赤道的印度洋—西太平洋海溫也持續(xù)偏暖,帶來的海陸熱力對比減小、經(jīng)向跨赤道氣流減弱有利于削弱夏季的季風(fēng)環(huán)流,使得高原夏季降水偏少,有利于形成高原夏季的暖異常。在這一高原氣溫—南半球大氣環(huán)流的遙相關(guān)關(guān)系中,4月南半球的大氣位勢高度場異常和與印度洋—西太平洋海溫異常相關(guān)的異常高度場分布也十分相似。這一前期的跨赤道區(qū)域海溫異常與南半球中高緯度位勢高度場異常的因果關(guān)系仍有待進(jìn)一步揭示。

Abstract:

In this paper, the teleconnection between the summer surface air temperature on the Tibetan Plateau and the Southern Hemisphere atmospheric circulation were investigated by using Maximum Covariance Analysis (MCA) as well as regression and composite analysis with the observation and reanalysis data. Results show that warm anomalies occur in most of the central and eastern plateau in summer when the Southern Hemisphere atmospheric circulation shows negative geopotential height anomalies in the polar-and-mid latitude and positive height anomalies in the lower latitude Indian Ocean-West Pacific regions in April. In the above connection, the Indian Ocean-West Pacific SST anomaly may play an important role in bridging the two fields. When the plateau summer temperature is high, the equatorial Indian Ocean-West Pacific SST exhibits warm anomalies lasting from earlier spring to summer, resulting in reduced sea-land thermal contrast and weakened cross-equatorial flow, which is conducive to the weakened summer monsoon circulation and reduced summer precipitation in Tibetan Plateau. The latter is conducive to the formation of the summer warm temperature anomaly in the plateau. In such teleconnection, the atmospheric geopotential height anomaly in the Southern Hemisphere in April is very similar to the distribution of anomalous geopotential height associated with the Indian Ocean-West Pacific SST anomaly. The causal relationship between this pre-existing Indian Ocean-West Pacific SST anomaly and the Southern Hemispheric mid-high latitude atmospheric circulation needs further investigations.

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李文毅,張洋.青藏高原夏季熱力狀態(tài)和南半球大氣環(huán)流的可能聯(lián)系.氣象科學(xué),2023,43(4):427-437 LI Wenyi, ZHANG Yang. Possible relationship between the summer thermal state of the Tibetan Plateau and the atmospheric circulation in the Southern Hemisphere. Journal of the Meteorological Sciences,2023,43(4):427-437

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收稿日期:2023-04-19
最后修改日期:2023-05-15
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在線發(fā)布日期: 2024-01-23
出版日期: 2023-08-15

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