Plateau Meteorology

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2015 , Vol. 34 >Issue 3: 690 - 699

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00010

Analysis of Relationship Between Sea Surface Temperature in Tropical Indian Ocean and Precipitation in East of Northwest China

  • YANG Jianling ,
  • LI Yanchun ,
  • MU Jianhua ,
  • WANG Suyan ,
  • 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 Meteorological Science, Yinchuan 750002, China

Received date: 2013-07-09

  Online published: 2015-06-28

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Abstract

Most previous researches of Sea Surface Temperature Anomaly (SSTA) in the tropical Indian ocean influencing precipitation mainly focused on the eastern region of China. In recent years, the latest studies have found important climatic effects of the inter-annual first mode of the tropical Indian Ocean Basin Mode (IOBM). So it is necessary to study the influence of SSTA in the tropical Indian Ocean on precipitation anomaly of East of Northwest of China (ENC). Based on 99 meteorological stations monthly precipitation data in ENC, and monthly SST data of HadISST data set from Hardley center during 1961-2009, adopting MCA, correlation, regression and other statistical methods, the inter-annual and inter-decadal relationship between the precipitation in ENC and the tropical Indian ocean SST is analyzed in this article. It is found that the persisting anomaly of the IOBM in previous winter and spring is significantly corrected with precipitation anomaly main mode in ENC in subsequent May. In further the relationship is difference before and after mid 1970s, which being the climate shift year of north hemisphere. The relationship is not significant before mid 1970s, while after mid 1970s the relationship is strengthened and significant, with passing 95% significant test. Usually the warm (cold) Basin mode in previous winter and spring is corresponding to more (less) precipitation in subsequent May in ENC. The preliminary analysis is that the impact of the tropical Indian ocean basin mode on precipitation anomaly in ENC is a concrete manifestation of IOBM ‘Capacitor’ effect.

Key words： Topical Indian Ocean; Sea Surface Temperat; Indian Ocean Basin M; East of Northwest Ch; Precipitation

Cite this article

YANG Jianling , LI Yanchun , MU Jianhua , WANG Suyan , WANG Min , TIAN Lei . Analysis of Relationship Between Sea Surface Temperature in Tropical Indian Ocean and Precipitation in East of Northwest China[J]. Plateau Meteorology, 2015 , 34(3) : 690 -699 . DOI: 10.7522/j.issn.1000-0534.2014.00010

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