|
|
The Second Decadal Leading Mode of East Asian Summer Monsoon Rainfall |
BAO Qing1, YU Pei1,2 |
1The State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
2University of the Chinese Academy of Sciences, Beijing 100049, China |
|
|
Abstract The first decadal leading mode of East Asian summer rainfall (EASR) is characterized by rainfall anomalies along the East Asian subtropical rain belt. This study focuses on the second decadal leading mode (2DLM), accounting for 17.3% of rainfall decadal variance, as distinct from the other two neighboring modes of EAMR, based on the state-of-the-art in-situ rainfall data. This mode is characterized by a South-China-wet–Huaihe-River-dry pattern, and is dominated by a quasi-30-yr period. Further analysis reveals the 2DLM corresponds to an enhanced lower-level monsoon jet, an eastward extension of the western North Pacific subtropical high, and a weakened East Asian upper-level westerly jet flow. The Tibetan Plateau surface temperature and Pacific Decadal Oscillation (PDO) are closely linked with the 2DLM. The regressed SST pattern indicates the PDO-like pattern of sea surface temperature anomalies may have a teleconnection relationship with the 2DLM of EASR.
|
Received: 18 March 2014
Revised: 09 April 2014
Accepted: 14 April 2014
|
Corresponding Author:
BAO Qing,
E-mail: baoqing@mail.iap.ac.cn
|
|
|
|
|
|
|