基于L波段雷达探空资料的南京低空逆温特征
投稿时间: 2017-01-23  最后修改时间: 2017-03-21  点此下载全文
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作者单位E-mail
夏敏洁 南京市气象局, 江苏 南京 210000 361076475@qq.com 
周文君 盐城市气象局, 江苏 盐城 224000  
裴海瑛 南京市气象局, 江苏 南京 210000  
戴竹君 南京市气象局, 江苏 南京 210000  
基金项目:江苏省自然科学基金(BK20130111);江苏省气象局重点项目(KZ201405);江苏省科技支撑计划社会发展重大研究(BE2012771);无锡市科技发展资金社会发展项目(CSE11N1301);江苏省省级环保科研课题(2014021);国家科技支撑计划(2014BAC22B04);江苏省气象局预报员专项(JSYBY201615);江苏省气象局预报员专项(JSYBY201604)
中文摘要:利用2010-2015年南京市逐日的08时(北京时间,下同)和20时L波段雷达探空秒级数据资料,研究南京市边界层内(2 km以下)接地逆温和悬浮逆温的出现频率、逆温层厚度以及逆温强度等,对该地区低空大气逆温特征变化进行了详细分析。结果发现:南京市逆温日的发生频率较高,达81.68%,其中接地逆温23.9%,悬浮逆温71.8%,早间发生频率高于晚间,月分布均表现为盛夏季节频率低,秋冬季节发生频率高。逆温层厚度也是夏季最薄,冬季到初春厚度较大;早间的逆温层厚度大于晚间的逆温层厚度,悬浮逆温厚度大于接地逆温厚度。南京市逆温强度夏季小,冬季大,有明显的季节变化趋势。逆温强度早晚差异较小,但接地逆温平均逆温强度是悬浮逆温的1.5倍。逆温强度达到2.0℃/hm的强逆温有50%以上出现在冬季。通过计算污染物浓度与逆温强度的相关性,发现污染物浓度(PM2.5、PM10、SO2、NO2、CO)与逆温强度有很好的正相关性,由此说明低空大气逆温层结状况对空气质量有一定影响。
中文关键词:逆温强度  逆温频率  接地逆温  悬浮逆温
 
Characteristic analysis of lower-level temperature inversion over Nanjing based on L-band radar data
Abstract:The temperature inversion in the boundary layer is an important indicator of atmospheric stability.The strong inversion may result in the accumulation of pollutants in the lower layer.In addition,the accumulation of strong inversion energy can also cause severe convective weather.All of these have a huge impact on the production of human life.In order to analyze the characteristics of temperature inversion in the boundary layer (below 2 km) over Nanjing City,this paper used the daily L-band radar data at 08:00 BST and 20:00 BST from 2010 to 2015.The frequency,intensity and thickness of ground temperature inversion and suspended inversion were analyzed in detail.The results reveal that the frequency of temperature inversion is high over Nanjing,up to 81.68%,including 23.9% ground inversion and 71.8% suspended inversion.The frequency of temperature inversion at 08:00 BST is higher than that at 20:00 BST.The temperature inversion occurs mostly in autumn and winter and rarely in summer.The inversion thickness is the lowest in summer and the maximum in winter and early spring.The inversion thickness at 08:00 BST is larger than that at 20:00 BST.The thickness of suspended inversion is larger than that of ground inversion.This phenomenon is due to the change of solar radiation.Solar radiation increases temperature at day time and strengthens the turbulence,resulting in the inversion weakened or disappeared.On the contrary,the ground temperature gradually decreased at night with the turbulence weakening,which resulting in the inversion intensity and thickness strengthened.The inversion intensity is weak in summer and strong in winter,which has an obvious seasonal variation.There is a little difference in inversion intensity between 08:00 BST and 20:00 BST.But the average of ground inversion intensity is 1.5 times of suspended inversion intensity.Most of strong inversion with intensity higher than 2℃/hm happened in winter.Based on the daily monitoring data of mass concentration of air pollutants in 2014 and 2015,the paper analyzed the relativity of pollutant mass concentration and inversion elements (inversion intensity and inversion thickness).The results reveal that the mass concentrations of pollutants (PM10,PM2.5,NO2,SO2 and CO) are in positive correlations with the inversion intensity and thickness.In other words,the stronger the inversion layer,the higher the pollutant mass concentration.The mass concentration of ozone is in a negative correlation with the inversion intensity and thickness,which is related to the diurnal variation of ozone mass concentration.Therefore,the atmosphere inversion in the low layer is one of important factors that influence the air quality.The changes of the inversion elements (inversion intensity and thickness) have certain directive significance to air quality forecast.
keywords:temperature inversion intensity  frequency of temperature inversion  ground inversion  suspended inversion
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