Plateau Meteorology

Plateau Meteorology >

2015 , Vol. 34 >Issue 5: 1292 - 1300

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00067

Relation of Spring Dust-Storm Activities in Northern China and Changes of Upper Westerlies

  • LI Xue ,
  • LIU Xiaodong
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  • State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Science, Xi'an 710075, China;2. Graduate University of Chinese Academy of Science, Beijing 100049, China

Received date: 2013-11-14

  Online published: 2015-10-28

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Abstract

Based on the strong sandstorm sequence datasets produced by the National Meteorological Information Center and the NCEP/NCAR reanalysis data from 1954 to 2007, the connection between sandstorm activities in northern China (northward to 30°N) and changes of high-altitude westerly jet in East Asia was investigated.The results of correlation analysis show that the positively correlation is exist between the frequency of spring sandstorm in the northern China and the changes in the high-altitude westerly jet axis position which is significant at α=0.01, with the correlation coefficient of 0.36, and the relationship exists both at the interannual and interdecadal time scales.The location of jet axis has northern (southern) movement during the years of more (less) sandstorm activities, compared with the normal year.The sandstorm activities exhibit a decreasing trend from 1954 to 2007, and the high-altitude westerly jet axis moves southward systematically at the same time.Further analyses shows that the sandstorm activities is impacted by the position changes of high-altitude westerly jet axis.When position of upper westerly jet axis on 200 hPa moves southward in spring, the westerly in the northern boundary between China and Mongolia (70°-E120°E, 42.5°N-52.5°N) becomes weaker, on the one hand, which lead to the surface wind in the dust source region decrease through the momentum downward transport, and constrain the power of sandstorm to break out; on the other hand, it reduces the wind shear and baroclinicity, limiting the generation of ground cyclones, finally leading to less sandstorm activities.

Key words： Northern China; Dust storm; Westerly jet; Correlation analysis

Cite this article

LI Xue , LIU Xiaodong . Relation of Spring Dust-Storm Activities in Northern China and Changes of Upper Westerlies[J]. Plateau Meteorology, 2015 , 34(5) : 1292 -1300 . DOI: 10.7522/j.issn.1000-0534.2014.00067

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