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Unstable relationship between spring Arctic Oscillation and East Asian summer monsoon

Authors

  • Miao-Ni Gao,

    1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing, China
    2. Academy of Disaster Reduction and Emergency Management Ministry of Civil Affairs & Ministry of Education, Beijing Normal University, Beijing, China
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  • Jing Yang,

    Corresponding author
    1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing, China
    • Correspondence to: J. Yang, State Key Laboratory of Earth Surface Processes and Resource Ecology (ESPRE), Beijing Normal University, Beijing 100875, China. E-mail: yangjing@bnu.edu.cn

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  • Dao-Yi Gong,

    1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing, China
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  • Seong-Joong Kim

    1. Korea Polar Research Institute, Division of Climate Change, Incheon, South Korea
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ABSTRACT

The relationship between spring (March to May) Arctic Oscillation (AO) and East Asian summer monsoon (EASM, May to July) on interannual timescale has a remarkable decadal variation in late 1990s, and their correlation coefficient abruptly turns from +0.77 during 1979–1997 to −0.62 during 1998–2007. In the following summer after a spring positive AO phase, the lower-troposphere over East Asia (EA) features a cyclonic anomaly before 1997 but an anticyclonic anomaly after 1997, which results from different simultaneous air–sea features imposed by spring AO and distinctive evolution from spring to summer. In pre-1997, the spring AO-associated signal is mainly memorized and persists over Pacific, because the spring AO-associated wave activity prefers the high-latitude propagation from North Atlantic to Pacific. In contrast, a subtropical wave train from North Atlantic Ocean to Indian Ocean (IO) is evidently enhanced in post-1997 epoch, and accordingly the IO plays a dominant role in memorizing and extending the influence of spring AO on EASM. This subtropical route of spring AO-EASM teleconnection is a new finding. The strengthening of the subtropical wave train in post-1997 epoch could be partly attributed to the strengthening signals of spring AO over North Atlantic Ocean.

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