Plateau Meteorology

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2016 , Vol. 35 >Issue 4: 845 - 853

DOI: https://doi.org/10.7522/j.issn.1000-0534.2015.00053

Relationship between Surface Sensible Heating over the Qinghai-Xizang Plateau and Precipitation in the Eastern Part of Northwest China in Spring

  • ZHOU Junqian ,
  • LIU Xin ,
  • LI Weiping ,
  • ZHU Lingjing ,
  • WU Hui
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  • Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081, China

Received date: 2015-03-26

  Online published: 2016-08-28

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Abstract

To study the relationship between spring surface heat abnormal field over the Qinghai-Xizang Plateau and the precipitation in eastern part of Northwest China, in-situ surface heat flux data on four representative sites to analysis the change characteristics of atmospheric boundary layer of the Qinghai-Xizang Plateau, then the relationship between spring surface sensible heat over the Qinghai-Xizang Plateau and spring rainfall in the eastern part of Northwest China at interannual time scale was studied by using JRA-55 and NCEP reanalysis data and site observation of rainfall in the eastern part of Northwest China, research results indicate that: (1) The sensible heat flux contributes more than the latent heat flux and is the main part of the surface diabatic heating field over the Qinghai-Xizang Plateau in spring. (2) There is a negative correlation between the rainfall anomalies of the eastern part of Northwest China and the surface sensible heat anomalies over the Qinghai-Xizang Plateau; (3)Stronger surface sensible heating over the Qinghai-Xizang Plateau in spring leads to weaker upward movement of the vertical circulation over the Qinghai-Xizang Plateau and its surrounding areas in the same season and vice versa; (4) Composite analysis of relative vorticity, geopotential height, wind and water vapor flux divergence in the eastern part of Northwest China shows that when the inter-annual anomalies of spring surface sensible heating on the Qinghai-Xizang Plateau is positive, there is positive anomaly of vorticity in the upper troposphere and negative vorticity in the middle and lower troposphere in the studied areas, airflows exit convergence movement on the higher level and sinking motion on the lower levels, weakening the moisture convergence from lower to higher level, resulting in the decrease of spring rainfall in the eastern part of Northwest China.

Key words： Sensible heat; Relative vorticity; Water vapor flux div; Rainfall

Cite this article

ZHOU Junqian , LIU Xin , LI Weiping , ZHU Lingjing , WU Hui . Relationship between Surface Sensible Heating over the Qinghai-Xizang Plateau and Precipitation in the Eastern Part of Northwest China in Spring[J]. Plateau Meteorology, 2016 , 35(4) : 845 -853 . DOI: 10.7522/j.issn.1000-0534.2015.00053

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