Plateau Meteorology

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2017 , Vol. 36 >Issue 2: 455 - 467

DOI: https://doi.org/10.7522/j.issn.1000-0534.2016.00139

Dominant Spatial Patterns of Summer Precipitation and Circulation Characteristic in the Middle of Northwest China

  • SHEN Hongyan ,
  • CHEN Lijuan ,
  • HU Po ,
  • QIAO Shaobo ,
  • ZHANG Tiaofeng
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  • Department of Atmospheric and Sciences, Lanzhou University, Lanzhou 730000, China;Qinghai Climate Center, Qinghai Key Laboratory of Disaster Preventing and Reducing, Xining 810001, China;National Climate Center, Laboratory of Climate Studies of China Meteorological Administration, Beijing 100081, China

Received date: 2016-10-17

  Online published: 2017-04-28

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Abstract

Based on the 55 stations data in the middle of Northwest China and NCEP/NCAR reanalysis dataset, the dominant modes of summer precipitation anomalies over the middle of Northwest China and corresponded circulation characteristic, water vapor transportation conditions were analyzed by diagnostic methods.There are three dominant EOF modes about summer rainfall.The first mode showed the same anomaly in whole region.The second showed an inverse pattern between the east and west.The third showed the opposite anomaly between the south and north.Further analysis were shown that the dominant precipitation EOF modes had different circulation and water vapor condition features.For EOF1 positive phase, the center of subtropical westerly wind was eastern to its normal position, Ural blocking high usually stronger than normal, water vapor transportation originates from Bay of Bengal, South China sea and west tropical Pacific.The water vapor convergence was significant in the middle of Northwest China.The EOF2 mode was connected with 'silk road' teleconnection pattern circulation.For the more rainfall in east and less in west pattern, the enhanced anticyclone circulation over central Asia provided strong cold air.And the anticyclone circulation anomaly in Northwest Pacific provided strong transport water vapor to the middle-west regions of China.A significant convergence was formed in the east part of Gansu province.The EOF3 mode was deeply affected by the middle-high geopotential height pattern.When rainfall anomaly was positive in south and negative in north, the circulation showed 'North-high and South-low' pattern over Eurasia.This mean a strengthened trough over Baikal which provides the strong westerly anomalies to the south of Baikal.At the same time, the vapor transformation originated from the Bay of Bengal, and further move to the east side of Tibet.A clear convergence formed in the southern of Qinghai province.From the above analysis, it showed significant differences about cold air conditions and the source of water vapor of the three dominant modes of summer precipitation in the middle of Northwest China.

Key words： The middle of Northw; Precipitation patter; EOF dominant modes; Circulation features; Water vapor transpor

Cite this article

SHEN Hongyan , CHEN Lijuan , HU Po , QIAO Shaobo , ZHANG Tiaofeng . Dominant Spatial Patterns of Summer Precipitation and Circulation Characteristic in the Middle of Northwest China[J]. Plateau Meteorology, 2017 , 36(2) : 455 -467 . DOI: 10.7522/j.issn.1000-0534.2016.00139

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