Advances in Atmospheric Sciences

, Volume 18, Issue 5, pp 659–673 | Cite as

EA WM-Related Air-Sea-Land Interaction and the Asian Summer Monsoon Circulation

  • Bueh Cholaw
  • Ji Liren
  • Sun Shuqing
  • Cui Maochang


Based on the data analysis, this study further explores the characteristics of East Asian winter monsoon (hereafter, EA WM, for brevity) as well as the related air-sea-land system, and illustrates how and to what degree anomalous signals of the subsequent Asian summer monsoon are rooted in the preceding EA WM activity. We identified an important air-sea coupled mode, i.e., the EA WM mode illustrated in Section 3. In cold seasons, strong EA WM-related air-sea two-way interaction is responsible for the development and persistence of the SSTA pattern of EA WM mode. As a consequence, the key regions, i.e., the western Pacific and South China Sea (hereafter, SCS, for brevity), are dominated by such an SSTA pattern from the winter to the following summer. In the strong EA WM years, the deficient snow cover dominates eastern Tibetan Plateau in winter, and in spring, this anomaly pattern is further strengthened and extended to the northwestern side of Tibetan Plateau. Thus, the combined effect of strong EA WM-related SSTA and Tibetan snow cover constitutes an important factor in modulating the Asian monsoon circulation. The active role of the EA WM activity as well as the related air-sea-land interaction would, in the subsequent seasons, lead to: 1) the enhancement of SCS monsoon and related stronger rainfall; 2) the northward displacement of subtropical high during Meiyu period and the related deficient rainfall over Meiyu rainband; 3) above-normal precipitation over the regions from northern Japan to northeastern China in summer; 4) more rainfall over the Arabian Sea and Northeast India, while less rainfall over southwest India and the Bay of Bengal. The strong EA WM-related air-sea interaction shows, to some degree, precursory signals to the following Asian summer monsoon. However, the mechanism for the variability of Indian summer monsoon subsequent to the strong EA WM years remains uncertain.

Key words

EA WM Air-sea-land interaction Interannual variability Asian summer monsoon 


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© Advances in Atmospheric Sciences 2001

Authors and Affiliations

  • Bueh Cholaw
    • 1
  • Ji Liren
    • 1
  • Sun Shuqing
    • 1
  • Cui Maochang
    • 2
  1. 1.LASG, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.Institute of OceanologyChinese Academy of SciencesQingdaoChina

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