2004年春季沙塵天氣分析
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國家自然科學基金項目(40305008)資助


Cause Analysis of Dusty Weather in Spring 2004
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    摘要:

    利用全國673個站每日8個時次的地面天氣報告資料和T213模式產品,分析了2004年春季我國沙塵天氣的主要特點,并初步揭示了其成因。結果表明:2004年春季我國北方共出現了15次明顯的沙塵天氣過程,其中3月相對偏多,4月卻明顯偏少;沙塵天氣過程的強度大多偏弱。原因在于2~4月上中旬我國北方主要沙塵源區氣溫持續偏高,降水偏少,地表疏松,沙塵天氣所必需的物質條件充足;同時,3月冷空氣頻繁影響我國北方,沙塵天氣相對較多,但由于大部分冷空氣勢力不強,影響時間短,所引發的沙塵天氣過程較弱。4月上中旬,影響我國北方的

    Abstract:

    The temporal and spatial distribution characteristics of dusty weather in China in spring 2004 are analyzed on the basis of the data from surface synoptic maps (8 times per day) and T213 model products. The results show that there were 15 major dusty weather processes, more in March and less in April and May, and most of them were weak. Further research shows that because the temperature was higher and the precipitation was less than the normal value in the earlier months, the soil moisture was less and the soil surface was drier in spring in the northern China. When the cold air attacked North China frequently in March, more dusty days and severe dust storms occurred. After March, the dusty weather events decreased quickly because of less cold air activities and weaker dynamic condition.

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牛若蕓.2004年春季沙塵天氣分析[J].氣象科技,2007,35(1):92~95

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  • 收稿日期:2005-07-15
  • 定稿日期:2005-09-20
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