期刊
INTERNATIONAL JOURNAL OF CLIMATOLOGY
卷 41, 期 -, 页码 E1469-E1482出版社
WILEY
DOI: 10.1002/joc.6780
关键词
atmospheric circulation; interdecadal change; Northeast Asia; sea surface temperature; water vapour budgets; water vapour transport
资金
- National Key Research and Development Program of China [2016YFA0600604]
- National Natural Science Foundation of China [4191101005, 41961144016, 41721004]
This study reveals a significant interdecadal change in the summer water vapor budget over Northeast Asia around the late-1990s, primarily influenced by a local anomalous anti-cyclone. The stationary component plays a dominant role in contributing to the total water vapor transport change, accounting for 84% compared to the transient component's 16%. The changes in water vapor budget are primarily attributed to the wind field change at the lower troposphere.
This study reveals an obvious interdecadal change in the summer water vapour budget over Northeast Asia around the late-1990s accompanied with the abrupt rainfall decrease. After the late-1990s, water vapour transported into Northeast Asia is apparently reduced under control of a local anomalous anti-cyclone. The water vapour transport is further explored by decomposing the water vapour flux into stationary and transient components, which are associated with the mean flow and transient eddy, respectively. The results indicate that the stationary component accounts for nearly 84% of the total water vapour budget change, much larger than the contribution from the transient component (16%). The correlation coefficient between the interdecadal variation of net and stationary (transient) water vapour budget is 0.95 (0.14). Hence, the stationary term plays a dominant role in contributing to interdecadal change in the total water vapour transport. In addition, change in the water vapour budget over Northeast Asia around the late-1990s is primarily attributed to the wind field change at the lower troposphere. A further comparison of the water vapour budgets in four boundaries of Northeast Asia shows that the water vapour budgets via the southern and northern boundaries display remarkable changes around the late-1990s, exerting significant influences on the total moisture budget change. The anomalous atmospheric water vapour transport circulations in association with the southern and northern boundaries both present a wave-like teleconnection pattern over the Eurasia, whose formation may be partly due to the combined impacts from the Pacific Decadal Oscillation and Atlantic Multidecadal Oscillation.
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