湖南春播育秧期不同低溫陰雨分布型的環流特征
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湖南省氣象局短平快課題“湖南春播育秧期低溫陰雨災害環流異常特征及其預測”資助


Atmospheric Circulation Characteristics of VariType Cold Rainy Weather in Spring Sowing and SeedlingRaising Periods in Hunan Province
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    摘要:

    利用1961—2013年湖南80個臺站的逐日降水、平均氣溫、日照資料和NECP/NCAR再分析資料、海溫資料,分析了近53年湖南省播種育秧期低溫陰雨日數的主要分布類型與同期大氣環流背景場及前冬海溫分布特征。結果表明: ①湖南省低溫陰雨日數空間分布主要類型為全省一致型和南北相異型。②當歐亞大陸中高緯度受東亞大槽的影響,加上低層冷暖空氣匯合和較好的濕度條件,有利于發生偏多型低溫陰雨;相反,當歐亞大陸中高緯度受高壓控制,加上低層中東部整體受異常北風和負相對濕度的影響,則易發生偏少型低溫陰雨。當湖南北部受低槽的影響,且為相對濕度大值區時,易發生北多南少型低溫陰雨;而當湖南南部受低槽和地形影響出現南嶺靜止鋒,南部為相對濕度大值區時,則易發生北少南多型低溫陰雨。③低溫陰雨偏多(少)年前冬赤道中東太平洋以及阿拉斯加灣海溫偏暖(冷),西北太平洋和北美洲以東的北大西洋海溫偏冷(暖)。北多(少)南少(多)型前冬赤道中東太平洋以及阿拉斯加灣海溫偏暖(冷),北美洲以東的北大西洋海溫異常偏暖(冷)。

    Abstract:

    Based on the daily precipitation, temperature and sunshine data from 80 meteorological stations in Hunan, NCEP/NCAR reanalysis data and sea temperature data from 1961 to 2013, the distribution types, the circulation patterns of the same period, and the previous winter SST field characteristics of cold rainy weather during spring sowing and seedlingraising periods in the past 53 years are studied. The results show: (1) There are mainly two anomalous distribution types: above normal (below normal)in whole province; above normal (below normal)in the northern and below normal (above normal) in the southern.(2) When East Asia major trough controls over the Eurasia, coupled with the convergence of lowlevel cold and worm air and the better humidity conditions, the above normal in whole province types is prone to appear. On the contrary, when the Eurasia is controlled by high pressure, coupled with the lowlevel abnormal north winds in the mideastern China and negative relative humidity, the below normal in whole province type is easy to appear. When the northern Hunan is affected by a trough and relative humidity is relatively high, the above normal in the northern province and below normal in the southern province types are easy to appear. When the southern Hunan is affected by a trough and topography and the Nanling stationary front, at the same time, the relative humidity in its south part is relatively high, the below normal in the northern province and above normal in the southern province types are easy to appear.(3) The above normal (below normal) in whole province type is easy to appear if the previous winter SST in the area of the equatorial central and eastern Pacific and Alaska is obviously higher (lower) than normal and that in the area of the Northwest Pacific Ocean and North Atlantic Ocean in the east of North America is obviously lower (higher) than normal. The above normal (below normal) in the northern province and below normal (above normal) in the southern province type is easy to appear if the previous winter SST is obviously higher (lower) than normal in both the area of the equatorial central and eastern Pacific and Alaska and the area of the Northwest Pacific Ocean, and that in the North Atlantic Ocean in the east of North America.

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李易芝,羅伯良,張龍.湖南春播育秧期不同低溫陰雨分布型的環流特征[J].氣象科技,2017,45(2):375~382

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  • 收稿日期:2016-03-11
  • 定稿日期:2016-10-12
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  • 在線發布日期: 2017-05-04
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