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Spring Arctic Oscillation-East Asian summer monsoon connection through circulation changes over the western North Pacific

Cited 59 time in scopus
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Title
Spring Arctic Oscillation-East Asian summer monsoon connection through circulation changes over the western North Pacific
Other Titles
봄철 북극진동과 동아시아 여름 몬순의 관계
Authors
Dao-Yi Gong
Tianjun Zhou
Dong Guo
Kim, Seong-Joong
Miao Hu
Yongqi Gao
Jing Yang
Subject
Meteorology & Atmospheric Sciences
Keywords
Arctic Oscillation; East Asia; North Pacific; Sea Surface Temperature; Summer Monsoon
Issue Date
2011
Publisher
Springer
Citation
Dao-Yi Gong, et al. 2011. "Spring Arctic Oscillation-East Asian summer monsoon connection through circulation changes over the western North Pacific". Climate Dynamics, 37(11-12): 2199-2216.
Abstract
In the present study the links between spring Arctic Oscillation (AO) and East Asian summer monsoon (EASM) was investigated with focus on the importance of the North Pacific atmospheric circulation and sea surface temperature (SST). To reduce the statistical uncertainty, we analyzed high-pass filtered data with the inter-annual time scales, and excluded the El Ni?no/Southern Oscillation signals in the climate fields using a linear fitting method. The significant relationship between spring AO and EASM are supported by the changes of multi-monsoon components, including monsoon indices, precipitation, and three-dimensional atmospheric circulations. Following a stronger positive spring AO, an anomalous cyclonic circulation at 850 hPa appears in southeastern Asia and the western North Pacific in summer, with the easterly anomalies spanning from the Pacific to Asian continent along 25°N?0°N and the westerly anomalies south of 15°N. At the same time, the summer western North Pacific subtropical high becomes weaker. Consistently, the positive precipitation anomalies are developed over a broad region south of 30°N stretching from southern China to the western Pacific and the negative precipitation anomalies appear in the lower valley of the Yangtze River and southern Japan. The anomalous cyclone in the western North Pacific persisting from spring to summer plays a key role in mreduce the statistical uncertainty, we analyzed high-pass filtered data with the inter-annual time scales, and excluded the El Ni?no/Southern Oscillation signals in the climate fields using a linear fitting method. The significant relationship between spring AO and EASM are supported by the changes of multi-monsoon components, including monsoon indices, precipitation, and three-dimensional atmospheric circulations. Following a stronger positive spring AO, an anomalous cyclonic circulation at 850 hPa appears in southeastern Asia and the
URI
http://repository.kopri.re.kr/handle/201206/6079
DOI
http://dx.doi.org/10.1007/s00382-011-1041-1
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