期刊
CLIMATE DYNAMICS
卷 46, 期 11-12, 页码 3793-3805出版社
SPRINGER
DOI: 10.1007/s00382-015-2805-9
关键词
East Asian winter monsoon; Sea surface temperature; Decadal variability; Atmospheric circulation; East Asian trough; North Pacific Oscillation
资金
- US Department of Energy, Office of Science Innovative and Novel Computational Impact on Theory and Experiment (DOE INCITE) program
- Office of Biological and Environmental Research (BER)
- National Oceanic and Atmospheric Administration Climate Program Office
- Special Fund for Public Welfare Industry (meteorology) [GYHY201306026]
- National Natural Science Foundation of China [41522503, 41421004]
In this study, a possible mechanism for the decadal variability in the East Asian winter monsoon (EAWM) is proposed. Specifically, the North Pacific sea surface temperature (SST) may play an important role. An analysis of the observations shows that the North Pacific SST has a remarkable decadal pattern whose phase shifted around the mid-1980s. This North Pacific SST decadal pattern can weaken the East Asian trough and enhance the North Pacific Oscillation through changing air-sea interactions over the North Pacific. The weak East Asian trough enhances the zonal circulation and weakens the meridional circulation over East Asia, consequently leading to a weaker southward cold surge and East Asia warming around the mid-1980s. The numerical experiment further confirms the pronounced physical processes. In addition, over the longer period of 1871-2012, the indices of the EAWM and North Pacific SST decadal pattern are also highly consistent on the decadal timescale, which further confirms the impact of the North Pacific SST decadal pattern on the EAWM decadal variability.
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