Characteristics of Shaanxi Summer Precipitation Anomalies in ENSO Developing and Decaying Stages

Zhao Qiang; Yan Huasheng; Cheng Lu

Vol.24, NO.4, 2013

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Article Navigation > Journal of Applied Meteorological Science > 2013 > 24(4): 495-503

Zhao Qiang, Yan Huasheng, Cheng Lu. Characteristics of Shaanxi summer precipitation anomalies in ENSO developing and decaying stages. J Appl Meteor Sci, 2013, 24(4): 495-503.

Citation:

Zhao Qiang, Yan Huasheng, Cheng Lu. Characteristics of Shaanxi summer precipitation anomalies in ENSO developing and decaying stages. J Appl Meteor Sci, 2013, 24(4): 495-503.

Zhao Qiang, Yan Huasheng, Cheng Lu. Characteristics of Shaanxi summer precipitation anomalies in ENSO developing and decaying stages. J Appl Meteor Sci, 2013, 24(4): 495-503.

Citation:

Zhao Qiang, Yan Huasheng, Cheng Lu. Characteristics of Shaanxi summer precipitation anomalies in ENSO developing and decaying stages. J Appl Meteor Sci, 2013, 24(4): 495-503.

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Characteristics of Shaanxi Summer Precipitation Anomalies in ENSO Developing and Decaying Stages

1.
Shangluo Meteorological Bureau of Shaanxi Province, Shangluo 726000
2.
Atmospheric Science Department, Yunnan University, Kunming 650091
3.
Shaanxi Provincial Climate Center, Xi'an 710016

Received Date: 2012-12-13
Rev Recd Date: 2013-03-04
Publish Date: 2013-08-31

Abstract

Abstract

Based on Shaanxi summer precipitation data from 1961 to 2008, NCEP/NCAR monthly reanalysis data, the influence of developing stage and decaying stage of ENSO events on Shaanxi summer precipitation is analyzed through composite analysis. It shows that the response of Shaanxi summer precipitation to ENSO in developing stage is very different from that of the decaying stage. During El Niño developing stage and La Niña decaying stage, the precipitation in Shaanxi is less than normal. During La Niña developing stage and El Niño decaying stage, Shaanxi has more precipitation than normal, and the most significantly impacted period by ENSO is July. The response of Shaanxi summer precipitation anomalies to La Niña developing stage and El Niño decaying stage is more remarkable than that of El Niño developing stage and La Niña decaying stage. There is a significant difference in atmospheric circulation in developing and decaying stages of ENSO, especially with regard to the western Pacific subtropical high and the East Asia monsoon strength. During El Niño developing stage and La Niña decaying stage, the western Pacific subtropical high is stronger and more west than normal and the East Asia monsoon is weaker than normal. During La Niña developing stage and El Niño decaying stage, the situation is the opposite. When the subtropical high is stronger and further west, Shaanxi has southwest wind anomalies which transport water vapor, the northern part has the north wind anomalies that bring cold air, and the precipitation would be higher. ENSO developing and decaying stages affect on the change of atmospheric circulation and the East Asia monsoon, and contribtute to Shaanxi summer precipitation. During El Niño developing stage and La Niña decaying stage, the East Asia monsoon is stronger, and Shaanxi has less precipitation. During La Niña developing stage and El Niño decaying stage, the East Asia monsoon is weaker and Shaanxi has more precipitation. In comparison, the East Asia summer monsoon is greatly affected by El Niño events than La Niña events. At the same time, Shaanxi summer precipitation is also affected by El Niño events more greatly. This is an evidence that ENSO affect Shaanxi summer precipitation through changing the East Asia summer monsoon strength.
- Shaanxi summer precipitation;
- ENSO developing and decaying stages;
- the East Asian summer monsoon

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References(28)

Figures and Tables

Fig. 1 The distribtution of meteorological stations in Shaanxi Province

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图 2 El Niño发展阶段和衰减阶段陕西夏季降水量距平百分率合成图

(单位：%;阴影区为达到0.05显著性水平的区域)

Fig. 2 The composite of Shaanxi precipitation anomalies percentage in El Niño developing and decaying stages

(unit:%;the shaded denotes passing the test of 0.05 level)

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Fig. 3 The same as in Fig. 2, but for La Niña

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图 4 El Niño发展和衰减阶段夏季平均500 hPa高度场 (单位：dagpm) 和700 hPa风场异常分布合成图

(阴影区为达到0.05水平显著性水平区域)

Fig. 4 The composite of summer mean 500 hPa height (unit:dagpm), 700 hPa wind anomalies in El Niño developing (a) and decaying (b) stages

(the shaded denotes passing the test of 0.05 level)

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Fig. 5 The same as in Fig. 4, but for La Niña

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图 6 1960—2008年夏季陕西78个气象站降水量与东亚夏季风指数、南海夏季风指数、南亚夏季风指数的相关分布

(阴影区表示达到0.05显著性水平)

Fig. 6 Correlation coefficients of Shaanxi summer precipitation to summer monsoon indexes of East Asia, the South China Sea, Southeast Asia during 1961—2008

(the shaded denotes passing the test of 0.05 level)

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Table 1 The composited summer monsoon indexes of East Asia, South China Sea, Southeast Asia in ENSO developing and decaying stages and its t-test value

ENSO阶段	东亚夏季风		南海夏季风		东南亚夏季风
ENSO阶段	指数	t检验值	指数	t检验值	指数	t检验值
El Niño发展阶段	0.62	4.50^**	0.72	6.49^**	0.50	5.42^**
El Niño衰减阶段	-0.66	-3.82^**	-0.90	-5.68^**	-0.83	-3.70^**
La Niña发展阶段	-0.53	-1.45	-0.77	-2.14^*	-0.73	-1.70
La Niña衰减阶段	0.24	0.61	0.30	0.82	0.097	0.30
注：表示达到0.1显著性水平；*表示达到0.05显著性水平。

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