不同波數(shù)行星波對冬季各月北半球平流層1980s—1990s變化的影響

doi:10.12306/2023jms.0086

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不同波數(shù)行星波對冬季各月北半球平流層1980s—1990s變化的影響
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                        10.12306/2023jms.0086
                    
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中圖分類號:P421.32
基金項目:廣東省重點領域研發(fā)計劃項目(2020B1111200001)

On influence of planetary waves with different wavenumbers to the 1980s—1990s changes during winter months in the Northern Hemisphere stratosphere

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為探究20世紀末平流層氣候變化在冬季各月的差異,本文選用逐日ERA5和NCEP/NCAR資料,從極渦強度和行星波強迫方面研究平流層的年代際變化,并重點關注1、2、3波分別的貢獻。研究發(fā)現(xiàn),12月由行星波1波主導,1波的上傳在中高緯度平流層顯著增加,2波僅在中緯度平流層上傳減弱;2月行星波1波僅在極區(qū)低平流層上傳減少,但2波的上傳在中高緯度平流層顯著減弱。3波主要使沿低緯度波導的傳播在12月減弱,在2月增強。進一步分析表明,行星波上傳的變化會影響平流層極渦的變化,主要體現(xiàn)在12月極地波導增強使得極渦減弱,極區(qū)平流層增暖,平均緯向風減速;2月極地波導減弱使得極渦加強,極區(qū)平流層降溫,平均緯向風加速。

Abstract:

To investigate the differences in stratospheric climate changes during various winter months at the end of the 20th century, the daily ERA5 and NCEP/NCAR data was used to study the decadal changes of the stratosphere in terms of polar vortex intensity and planetary wave forcing, with a particular focus on the contributions of wave 1, wave 2, and wave 3. Results found that in December, wave 1 dominated, with an increased upward propagation of wave 1 in the mid-to-high latitude stratosphere and a weakened upward propagation of wave 2 only in the mid latitude stratosphere. In February, wave 2 predominated, with a significant weakening of its upward propagation in the mid-to-high latitude stratosphere and a decrease in the upward propagation of wave 1 only in the polar region low stratosphere. Wave 3 primarily led to a weakening of propagation along low latitude waveguides in December and an enhancement in February. Further study indicated that the changes in planetary wave propagation associated with the polar vortex in the stratosphere. In December, along with the strengthened propagation along polar waveguides, the polar vortex weakened, warmed, and the mean zonal wind decelerated. In February, with the weakened propagation along polar waveguides, the polar vortex strengthened, cooled, and the mean zonal wind accelerated.

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徐凡森,吳國華,劉仁強,楊婷.不同波數(shù)行星波對冬季各月北半球平流層1980s—1990s變化的影響.氣象科學,2025,45(3):378-384 XU Fansen, WU Guohua, LIU Renqiang, YANG Ting. On influence of planetary waves with different wavenumbers to the 1980s—1990s changes during winter months in the Northern Hemisphere stratosphere. Journal of the Meteorological Sciences,2025,45(3):378-384

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收稿日期:2023-08-16
最后修改日期:2023-12-01
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在線發(fā)布日期: 2025-08-30
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