• Adv. Atmos. Sci.  2017, Vol. 34 Issue (12): 1415-1425    DOI: 10.1007/s00376-017-6321-1
    Variation in Brewer-Dobson Circulation During Three Sudden Stratospheric Major Warming Events in the 2000s
    Mengchu TAO1, 2, Yi LIU1, Yuli ZHANG1()
    1Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
    2University of Chinese Academy of Sciences, Beijing 100049, China
    Abstract
    Abstract  

    As the strongest subseasonal atmospheric variability during boreal winter, three remarkable sudden stratospheric major warming (SSW) events in the 2000s are investigated in terms of the Brewer-Dobson circulation (BDC) response. Our study shows that the changes of cross-isentropic velocity during the SSWs are not only confined to the polar region, but also extend to the whole Northern Hemisphere: enhanced descent in the polar region, as well as enhanced ascent in the tropics. When the acceleration of the deep branch of the BDC descends to the middle stratosphere, its strength rapidly decreases over a period of one to two weeks. The acceleration of the deep branch of the BDC is driven by the enhanced planetary wave activity in the mid-to-high-latitude stratosphere. Different from the rapid response of the deep branch of the BDC, tropical upwelling in the lower stratosphere accelerates up to 20%-40% compared with the climatology, 20-30 days after the onset of the SSWs, and the acceleration lasts for one to three months. The enhancement of tropical upwelling is associated with the large-scale wave-breaking in the subtropics interacting with the midlatitude and tropical Quasi-Biennial Oscillation-related mean flow.

    Just Accepted Date: 18 July 2017   Issue Date: 08 November 2017
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    Mengchu TAO
    Yi LIU
    Yuli ZHANG
    Cite this article:   
    Mengchu TAO,Yi LIU,Yuli ZHANG. Variation in Brewer-Dobson Circulation During Three Sudden Stratospheric Major Warming Events in the 2000s[J]. Adv. Atmos. Sci., 2017, 34(12): 1415 -1425 .
    URL:  
    http://159.226.119.58/aas/EN/10.1007/s00376-017-6321-1     OR     
    http://159.226.119.58/aas/EN/Y2017/V34/I12/1415
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