VARIATION OF DUST WEATHER AND ITS CLIMATIC ATTRIBUTION ANALYSIS IN NORTHERN PARTOF CHINA

Zhang Li; Ding Yihui; Ren Guoyu

Vol.16, NO.5, 2005

Article Contents

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Zhang Li, Ding Yihui, Ren Guoyu. Variation of dust weather and its climatic attribution analysis in northern partof China. J Appl Meteor Sci, 2005, 16(5): 583-592.

Citation:

Zhang Li, Ding Yihui, Ren Guoyu. Variation of dust weather and its climatic attribution analysis in northern partof China. J Appl Meteor Sci, 2005, 16(5): 583-592.

Zhang Li, Ding Yihui, Ren Guoyu. Variation of dust weather and its climatic attribution analysis in northern partof China. J Appl Meteor Sci, 2005, 16(5): 583-592.

Citation:

Zhang Li, Ding Yihui, Ren Guoyu. Variation of dust weather and its climatic attribution analysis in northern partof China. J Appl Meteor Sci, 2005, 16(5): 583-592.

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VARIATION OF DUST WEATHER AND ITS CLIMATIC ATTRIBUTION ANALYSIS IN NORTHERN PARTOF CHINA

1.
Chinese Academy of Meteorological Sciences, Beijing100081
2.
National Climate Center, Beijing100081
3.
Graduate University of Chinese Academy of Sciences, Beijing100049

Received Date: 2003-10-20
Rev Recd Date: 2005-06-24
Publish Date: 2005-10-31

Abstract

Abstract

Based on the surface observations from 1954 to 2001, the tendency of dust weather frequency is presented by Mann-Kendall method, and the relationships of the frequency tow ind, relative humidity, air temperature and dryness index are analyzed.The Geopotential height in 1000 hPa from NCEP/NCAR reanalysis data is used to study the pressure gradient change in winter and spring from 1954 to 2001.Results show that the direct natural causes of dust weather frequency change in the recent 50 years include the decrease of daily mean wind speed, the decrease of number of day s with daily mean w ind speed higher than 5.0 m/s, the increase of precipitation in the same spring and last w inter, and the improved condition of atmosphere and soil moisture in some potential dust resource areas.Results also show that decrease of pressure gradient in winter and spring influences dust weather frequency by affecting w ind speed indirectly.
- Dust weather;
- Wind speed;
- Precipitation;
- Temperature;
- Climate change

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References(25)

Figures and Tables

图 1 研究区域示意图

(斜线区为计算北方沙尘天气发生次数的区域, 阴影部分为区域平均气候要素的计算区域)

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图 2 1954～2001年我国北方平均沙尘天气年发生日数的变化

(a)沙尘天气年发生日数,(b)北方平均沙尘暴、扬沙、浮尘和沙尘天气总日数演变趋势MK检验

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图 3 1954～2001年我国北方各季平均沙尘日数演变趋势的MK检验

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图 4 我国北方各站年沙尘天气发生日数与各气候要素的关系及相关检验结果

(a)降水量,(b)平均相对湿度,(c)平均风速,(d)日平均风速≥5 m/s天数,(e)平均温度,(f)干燥度(黑点标注的为显著水平达0.05的站点)

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图 5 1954～2001年冬、春两季1000 hPa区域平均位势高度差值年际变化

(实线:冬季, 区域45°～55°N, 85°～100°E平均与区域35°～45°N, 85°～100°E平均之差;虚线:春季, 区域45°～55°N, 80°～90°E平均与区域35°～45°N, 80°～90°E平均之差)

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图 6 我国北方各站春季沙尘日数与春季降水(a)和冬春两季降水总量(b)的相关关系

(黑点标注的为显著水平达0.05的站点)

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表 1 北方各季平均沙尘天气日数与各气候要素相关关系

表 2 北方各季平均沙尘暴发生日数与各气候要素相关关系

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