Analyses of Atmospheric Circulation of Tropical Indian Ocean Basin Mode Influencing Precipitation in East of Northwest China

YANG Jianling; ZHENG Guangfen; WANG Suyan; MU Jianhua; WANG Min; TIAN Lei

doi:10.7522/j.issn.1000-0534.2014.00011

2015 , Vol. 34 >Issue 3: 700 - 705

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00011

Analyses of Atmospheric Circulation of Tropical Indian Ocean Basin Mode Influencing Precipitation in East of Northwest China

YANG Jianling ,
ZHENG Guangfen ,
WANG Suyan ,
MU Jianhua ,
WANG Min ,
TIAN Lei

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Key Laboratory of Meteorological Disaster Preventing and Reducing in Ningxia, Yinchuan 750002, China;2. Ningxia Institute of Meteorology Science, Yinchuan 750002, China

Received date: 2013-07-09

Online published: 2015-06-28

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Abstract

Our previous study shows that since mid 1970s the persisting anomaly of the tropical India Ocean Sea Basin Mode (IOBM) in previous winter and spring is significantly corrected with precipitation anomaly main mode in the East of Northwest China (ENC) in subsequent May. In this study, using regression method, the atmospheric circulation anomaly and possible mechanism of the IOBM influencing on precipitation in ENC are studied. It is found that the warming IOBM can induce the responding of 'Matsuno-Gill Pattern' in the atmosphere and form the wave train over area from the tropical Indian Ocean to Europe to Asia at middle to upper troposphere level. The anomalous values of wave train increase with height increasing. ENC is just located between the negative center of Xinjiang to Balkhash Lake and positive center of East Asia, and just controlled by the pattern of ‘West Low and East High’, which is the typical circulation pattern of more precipitation in ENC. Corresponding to the wave train of height anomaly, there are three significant cyclone and anticyclone anomaly centers over Europe-Asia area. At upper level of 200 hPa, it is the large scale wind divergence anomaly over area from North China to ENC, and at lower level of 850 hPa it is the convergence over there. Concerned with the divergence at upper level and convergence at lower level, it induces the vertical ascending, which is advantage of more precipitation. The vertical ascending motion center is over area from North China to ENC. So it is said that the IOBM can influence the precipitation anomaly over ENC by inducing the wave train over Europe to Asia area at middle-upper troposphere, and informing anomaly circulation pattern of 'West Low and East High' over ENC. For the cold case of IOBM, it is vise verse.

Key words： Tropical Indian Ocea; Sea surface temperat; East of Northwest Ch; Precipitation; Atmospheric circulat

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YANG Jianling , ZHENG Guangfen , WANG Suyan , MU Jianhua , WANG Min , TIAN Lei . Analyses of Atmospheric Circulation of Tropical Indian Ocean Basin Mode Influencing Precipitation in East of Northwest China[J]. Plateau Meteorology, 2015 , 34(3) : 700 -705 . DOI: 10.7522/j.issn.1000-0534.2014.00011

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