Possible Linkage between Winter Surface Sensible Heat Flux Anomalies over the Mid-High Latitudes of the Eurasian Continent and Summer Precipitation in the Eastern Part of Northwest China

  • PANG Xueqi ,
  • LI Dongliang ,
  • YAO Huiru
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  • Nanjing University of Information Science and Technology Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environmental Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD), Nanjing 210044, China

Received date: 2016-03-22

  Online published: 2017-06-28

Abstract

On the basis of daily precipitation observations at 156 stations from 1979 to 2012 in eastern part of Northwest China and the monthly means of surface sensible heat flux of NCEP/DOE reanalysis data, physical mechanism and possible linkage between winter surface sensible heat flux anomalies over mid-high latitudes of the Eurasian Continent (61°N-67°N, 53°E-68°E) and summer precipitation over eastern part of Northwest China are analyzed in this study. The results show that when the sensible heat flux over mid-high latitudes of the Eurasian Continent transported from atmosphere to land surface is larger in winter, the sensible heat flux transportation from land surface to atmosphere will be larger in spring and summer as a consequence, the Ural blocking high and Mongolian low are strengthened, the northwest Pacific subtropical high is strengthened and migrating more west than normal, the subtropical westerly jet is anomalously northward and the South Asian high is far eastward, resulting in the ascending flow over eastern part of Northwest China strengthened. In addition, the transportation of the warm and moist air flows in low-level are strengthened in eastern part of Northwest China, as well as the water vapor convergence. All these contribute to the precipitation increasing over Eastern Part of Northwest China because of its location at the bottom of the Mongolian low and to the northwest of the subtropical high, in contrast, when the sensible heat flux transported from atmosphere to the surface is smaller in winter, the sensible heat flux transportation from land surface to atmosphere will also be smaller in spring and summer leading to the opposite atmospheric circulation anomalies in the summer, which will make the summer precipitation over the eastern part of Northwest China decreasing.

Cite this article

PANG Xueqi , LI Dongliang , YAO Huiru . Possible Linkage between Winter Surface Sensible Heat Flux Anomalies over the Mid-High Latitudes of the Eurasian Continent and Summer Precipitation in the Eastern Part of Northwest China[J]. Plateau Meteorology, 2017 , 36(3) : 675 -684 . DOI: 10.7522/j.issn.1000-0534.2016.00054

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