The Antarctic oscillation-East Asian summer monsoon connections in NCEP-1 and ERA-40 |
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| Authors: | Yali Zhu |
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| Institution: | Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029; Graduate University of Chinese Academy of Sciences, Beijing 100049; Climate Change Research Center (CCRC), Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | Connections between the spring Antarctic Oscillation (AAO) and the East Asian summer monsoon
(EASM) in two reanalysis datasets---NCEP-1 (NCEP/NCAR Reanalysis 1) and ERA-40 (ECMWF 40-year Reanalysis)---are
investigated in this study. Both show significant correlation between AAO and EASM rainfall over the Yangtze
River valley, especially after about 1985. Though ERA-40 shows weaker anomalous signals connecting AAO and EASM
over southern high latitudes than NCEP-1, both datasets reveal similar connecting patterns between them. A
wave-train-like pattern appears in the upper levels, from southern high latitudes through east of Australia and
from the Maritime Continent to East Asia. In positive AAO years, the cross equatorial southeasterly flow over
the Maritime Continent in the lower levels is strengthened, the specific humidity of the whole atmosphere over
East Asia increases, and convective activity is enhanced; thus the summer rainfall over East Asia increases.
The spring AAO-EASM connection may be better represented in ERA-40. |
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| Keywords: | Antarctic Oscillation East Asian summer monsoon NCEP-1 ERA-40 |
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