我國南方冰凍天氣過程低空逆溫層特征
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國家科技支撐計劃課題“南方冰雪災(zāi)害天氣成因研究”資助


Characteristics of Low Altitude Temperature Inversion Layer in Freezing Weather in Southern China
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    摘要:

    利用我國南方地區(qū)7省12個探空站1960—1999年時段冬半年高空規(guī)定層、特性層資料,分析南方地區(qū)冬季低空逆溫出現(xiàn)頻率、強度、厚度等,對照歷年“低溫雨雪冰凍”天氣過程期間的逆溫特征,揭示了南方冬季低空逆溫的基本規(guī)律和空間分布特征。結(jié)果表明:①南方冬季低空逆溫普遍存在;②逆溫強度指數(shù)隨逆溫底部高度的上升而增加,在700~600 hPa之間,逆溫強度最強;③偏西南地區(qū)(貴州和湖南南部)逆溫平均強度普遍高于偏東北地區(qū)(安徽和江蘇);④1964—1995年“低溫雨雪冰凍”天氣時段內(nèi)逆溫強度指數(shù)有逐年上升的趨勢,而逆溫層平均厚度有較明顯的減小趨勢;⑤逆溫出現(xiàn)時偏西南地區(qū)高空700 hPa附近有一溫度大于0 ℃的暖溫層,而偏東北部地區(qū)沒有;⑥“低溫雨雪冰凍”天氣期間偏西南地區(qū)以凍雨為主,偏東北地區(qū)以降雪為主。

    Abstract:

    Based on the low altitude standard level and significant level data of 12 radiosonde stations from 7 provinces in the southern China in winter half year from 1960 to 1999, the frequency, intensity, and thickness of low altitude temperature inversion layers in winter in the southern China are analyzed statistically and its basic regularities and spatial distribution characteristics are revealed, compared with the historical temperature inversion characteristics of freezing rain and snow weather processes. The results indicate: (1) the low altitude temperature inversion occurred widely in the southern China during winter; (2) the inversion intensity index increased with the increasing bottom height of temperature inversion, and the biggest inversion intensity occurred between 700 and 600 hPa; (3) the average intensity of temperature inversion in the southwest region (southern Guizhou and Hunan) was generally higher than that in the northeast region (Anhui and Jiangsu); (4) the inversion intensity index had an annual increasing trend during freezing rain and snow weather processes from 1964 to 1995 while the average thickness of the inversion layer had a significant decreasing trend; (5) when inversion appeared,there was a warm temperature layer with the temperature greater than 0 ℃ around 700 hPa in the southwest region, but not in the northeast region; (6) during freezing rain and snow weather processes, the southwest region was dominated by freezing rains while the northeast region was dominated by snow.

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張峻,王海軍.我國南方冰凍天氣過程低空逆溫層特征[J].氣象科技,2013,41(1):103~107

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  • 收稿日期:2011-10-20
  • 定稿日期:2012-03-02
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  • 在線發(fā)布日期: 2013-02-01
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