1983—2015年湖南雨凇時空分布特征及影響因子
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湖南省氣象局2017年短平快課題(XQKJ17B075)資助


Temporal and Spatial Distribution and Influencing Factors of Glazes in Hunan Province during 1983-2015
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    摘要:

    采用經驗正交函數(EOF)并對1983—2015年湖南省95個地面氣象站的雨凇觀測資料以及與北半球海冰和西太平洋和東北印度洋海溫資料的相關性進行分析。結果表明:湖南各站年均雨凇頻次為219次,總體呈現北少南多、山區北側少南側多、平原地帶少的分布特點;雨凇頻次呈逐年下降趨勢,且在湖南中北部地區下降趨勢顯著;湖南雨凇主要發生于相對濕度較大、極大風為偏北風且風速較小、最低氣溫在-3~0 ℃、最高氣溫在0~4 ℃的環境中。冬季同期(12月至次年2月),北地群島以東至白令海峽以北海域海冰密度和湖南雨凇頻次的相關關系為顯著正相關關系,而西北太平洋海溫和湖南雨凇頻次的顯著負相關區域表現為C型分布。

    Abstract:

    The relationship between glazes from 95 surface weather stations in Hunan Province and seaice density and sea surface temperature from 1983 to 2015 is studied by using the experimental orthogonal function analysis (EOF). The results indicate that the frequency of glazes in Hunan Province was 219 per year with the feature of a higher incidence of glazes in south and the southern mountain area compared with the north, the northern mountain area and in the plain. The frequency of glazes shows a tendency of decrease with the increase of time. The glazes in Hunan Province mainly formed in the environment with the condition of high relative humidity, low wind speed and north wind, as well as the minimum temperature between 3 and 0 ℃,and the maximum temperature between 0 to 4 ℃. The number of glazes happened in Hunan Province in winter increased with the increase of the sea ice density from the east of the Severnava Zemlva islands to the north of the Bering Strait, while in the area with the remarkable negative correlation between the frequency of the glazes and the sea surface temperature of the Northwest Pacific, three existed a Cshaped distribution.

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肖平,王文,胡燦明,黃菊梅,劉敏,王輝.1983—2015年湖南雨凇時空分布特征及影響因子[J].氣象科技,2018,46(3):515~523

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  • 收稿日期:2017-05-07
  • 定稿日期:2017-12-29
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  • 在線發布日期: 2018-06-28
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