The inter-decadal correlation between summer arctic oscillation and summer drought and moist characteristic of northwest China

Pengxiang Wang; Youfei Zheng; Landong Sun; Zhenhe Ren; Jinhai He; Qiang Zhang

doi:10.1117/12.733503

22 October 2007 The inter-decadal correlation between summer arctic oscillation and summer drought and moist characteristic of northwest China

Pengxiang Wang, Youfei Zheng, Landong Sun, Zhenhe Ren, Jinhai He, Qiang Zhang

Author Affiliations +

Proceedings Volume 6679, Remote Sensing and Modeling of Ecosystems for Sustainability IV; 66791G (2007) https://doi.org/10.1117/12.733503
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

In the context of 1960~2003 summertime rainfall and small-sized pan evaporations from 131 stations distributed over NW China covering Xinjiang, Qinghai, Gansu, Ningxia, Shaanxi as well as western Nei Mongolia, and Arctic Oscillation Indices (AOI) we define a homogenized index for aridity or wetness feature, with which to examine the relations between AOI and NW China aridity-wetness regime, indicating their noticeable relations on an interdecadal basis. It is found that during the decade of summer Arctic oscillation stronger than mean, the sea level pressure field shows positive (negative) anomalies over Asian landmass, a stronger anticyclonic anomaly circulation appears at 700 hPa over Lake Baikal and to the south, westerly (northerly) departure emerges in the westerly (monsoon) portion of NW China, as well as over NW China there appears a structure with a low in the west and a high in the east at the 500 hPa height field, suggestive of east-Asian summer monsoon weaker than normal such that westerly flows prevail in the westerly zone of NW China, leading to rainfall more than mean for a wetter climate while in its monsoon area the northerly winds are dominant, with precipitation less than normal, resulting in a climate drier in comparison to mean and v.v. for the decade with summer AO weaker than normal.

Citation Download Citation

Pengxiang Wang, Youfei Zheng, Landong Sun, Zhenhe Ren, Jinhai He, and Qiang Zhang "The inter-decadal correlation between summer arctic oscillation and summer drought and moist characteristic of northwest China", Proc. SPIE 6679, Remote Sensing and Modeling of Ecosystems for Sustainability IV, 66791G (22 October 2007); https://doi.org/10.1117/12.733503

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