Different PNA and NAO Configurations and Their Relationship with China Precipitation in Boreal Winter

  • WANG Bo ,
  • RAO Jian ,
  • WANG Huazhao ,
  • SHENG Chen
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  • Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/International Joint Laboratory on Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China;Gulang Meteorological Bureau, Gulang 733100, Gansu, China;School of Atmospheric Sciences, Nanjing University, Nanjing 210023, Jiangsu, China;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2017-10-17

  Online published: 2018-10-28

Abstract

By using the National Center for Environmental Prediction-National Center for Atmospheric Research (NECP/NCAR) monthly reanalysis data, the Global Precipitation Climatology Centre (GPCC) rainfall data, and the station precipitation data provided by the China Meteorological Administration, the four configurations of the extreme Pacific-North America (PNA) pattern and North Atlantic Oscillation (NAO) and their relationship with China precipitation were investigated.It is revealed that the PNA and NAO are nearly independent of each other on the interannual time scale with a correlation coefficient of -0.13 during 1950-2015.We classified PNA and NAO into four configurations:Extremely positive PNA and NAO (configuration I), positive PNA and negative NAO (configuration Ⅱ), extremely negative PNA and NAO (configuration Ⅲ), and negative PNA and positive NAO (configuration IV).Compared with the circulation anomalies related to one factor (PNA or NAO), those during different extreme configurations of PNA and NAO are relatively larger, which in turn induces different spatial patterns of the winter rainfall anomalies in China.Both GPCC and station precipitation data showed that, in configuration I, more rainfall appears in the south coastal China and the southeastern of Qinghai-Tibetan Plateau; while the Huaihe Valley is anomalously dry.In configuration Ⅱ, it is dry from the southwest China to the south coastal China, while the east coastal China is anomalously wet.In configuration Ⅲ, a nationwide drought is seen, especially of south to the Yellow River.However, when PNA and NAO are in their configuration IV, a large part of east China is anomalously wet, while the southwest China is significantly dry.

Cite this article

WANG Bo , RAO Jian , WANG Huazhao , SHENG Chen . Different PNA and NAO Configurations and Their Relationship with China Precipitation in Boreal Winter[J]. Plateau Meteorology, 2018 , 37(5) : 1264 -1276 . DOI: 10.7522/j.issn.1000-0534.2018.00012

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