Influence of the Asian-Pacific Oscillation on Spring Precipitation over Central Eastern China

ZHOU Botao; ZHAO Ping

doi:10.1007/s00376-009-9058-7

Impact Factor: 5.8

Volume 27 Issue 3

May 2010

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 2010 > 27(3): 575-582

Influence of the Asian-Pacific Oscillation on Spring Precipitation over Central Eastern China

1.
Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, National Climate Center, China Meteorological Administration, Beijing 100081,National Meteorological Information Center, China Meteorological Administration, Beijing 100081

doi: 10.1007/s00376-009-9058-7

Abstract
References
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Abstract:
The linkage between the Asian-Pacific oscillation (APO) and the precipitation over central eastern China in spring is preliminarily addressed by use of the observed data. Results show that they correlate very well, with the positive (negative) phase of APO tending to increase (decrease) the precipitation over central eastern China. Such a relationship can be explained by the atmospheric circulation changes over Asia and the North Pacific in association with the anomalous APO. A positive phase of APO, characterized by a positive anomaly over Asia and a negative anomaly over the North Pacific in the upper-tropospheric temperature, corresponds to decreased low-level geopotential height (H) and increased high-level H over Asia, and these effects are concurrent with increased low-level H and decreased high-level H over the North Pacific. Meanwhile, an anticyclonic circulation anomaly in the upper troposphere and a cyclonic circulation anomaly in the lower troposphere are introduced in East Asia, and the low-level southerly wind is strengthened over central eastern China. These changes provide advantageous conditions for enhanced precipitation over central eastern China. The situation is reversed in the negative phase of APO, leading to reduced precipitation in this region.
- Asian-Pacific oscillation,
- precipitation over central eastern China,
- Asia and the North Pacific,
- atmospheric circulations
References

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Manuscript History

Manuscript received: 10 May 2010

Manuscript revised: 10 May 2010

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Influence of the Asian-Pacific Oscillation on Spring Precipitation over Central Eastern China

1. Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, National Climate Center, China Meteorological Administration, Beijing 100081,National Meteorological Information Center, China Meteorological Administration, Beijing 100081

Manuscript received: 2010-05-10
Manuscript revised: 2010-05-10

Abstract: The linkage between the Asian-Pacific oscillation (APO) and the precipitation over central eastern China in spring is preliminarily addressed by use of the observed data. Results show that they correlate very well, with the positive (negative) phase of APO tending to increase (decrease) the precipitation over central eastern China. Such a relationship can be explained by the atmospheric circulation changes over Asia and the North Pacific in association with the anomalous APO. A positive phase of APO, characterized by a positive anomaly over Asia and a negative anomaly over the North Pacific in the upper-tropospheric temperature, corresponds to decreased low-level geopotential height (H) and increased high-level H over Asia, and these effects are concurrent with increased low-level H and decreased high-level H over the North Pacific. Meanwhile, an anticyclonic circulation anomaly in the upper troposphere and a cyclonic circulation anomaly in the lower troposphere are introduced in East Asia, and the low-level southerly wind is strengthened over central eastern China. These changes provide advantageous conditions for enhanced precipitation over central eastern China. The situation is reversed in the negative phase of APO, leading to reduced precipitation in this region.

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