稻麥輪作農田區大氣邊界層高度的日變化和季節特征
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國家重點研發計劃(2016YFC0203304)、國家自然科學基金(41505004,41475085)資助


Diurnal and Seasonal Variations of Atmospheric Boundary Layer Heights over RiceWheat Rotation Cropping Field
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    摘要:

    利用2015年7月至2016年5月壽縣稻麥輪作農田區觀測站地基多通道微波輻射計觀測的高時間分辨率溫度廓線資料,結合位溫梯度法,計算了該站點的大氣邊界層高度,分析了邊界層高度的日、月和季節演變規律。結果顯示,晴朗天氣情況下,邊界層高度具備典型的日變化特征,隨著地面溫度的升高邊界層高度不斷增大。其最大平均值通常出現在午后,8月平均高度最高,超過1520 m,1月最低,只有520 m。而且邊界層高度具有季節變化趨勢,春季(3—5月)、夏季(6—8月)、秋季(9—11月)和冬季(12月至次年2月)平均高度分別為436 m,499 m,377 m和322 m。將邊界層高度結果與FNL和ERAInterim數據進行對比,發現在白天時間段(08:00—19:00)FNL和ERAInterim比觀測平均值分別高258 m,346 m,夜間時間段(19:00至次日08:00)比觀測平均值分別低144 m,102 m。

    Abstract:

    By using the high temporal resolution temperature profile data observed from multichannel microwave radiometer over the ricewheat rotation cropping field observation site at Shouxian from July 2015 through May 2016, the atmospheric boundary layer heights are calculated with the potential temperature gradient method, and the diurnal, monthly, and seasonal variation characteristics of the atmospheric boundary layer heights are studied in this paper. It is found that the atmospheric boundary layer heights have a typical diurnal variation in fine weather, which is almost in the same phase of the diurnal temperature variation. During a day, the average largest height usually appears in afternoon, with the largest value in August (greater than 1520 meters) and smallest value in January (520 meters). The atmospheric boundary layer heights also show a seasonal cycle: the smallest in winter (322 meters), and the second smallest in autumn (377 meters), the second largest in spring (436 meters), and the largest in summer (499 meters). The atmospheric boundary layer height calculated from the temperature observations is 258 meters (346 meters) greater than the value from the FNL (ERAInterim) data during the daytime (i.e., 08:00-19:00 local time), while it is 144 meters (102 meters) smaller than the value from the FNL (ERAInterim data) during the nighttime (i.e., 19:00-8:00 local time).

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劉繞,李煜斌,高志球.稻麥輪作農田區大氣邊界層高度的日變化和季節特征[J].氣象科技,2017,45(3):526~534

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  • 收稿日期:2016-06-18
  • 定稿日期:2016-10-08
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  • 在線發布日期: 2017-07-03
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