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气象:2017,43(5):591-597
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L波段探空雷达秒数据在污染天气边界层分析中的应用
刘超, 花丛, 张恒德, 吕梦瑶, 张碧辉
(国家气象中心,北京 100081)
Application of L-Band Radar Sounding Data in Analyzing Polluted Weather Boundary Layer
LIU Chao, HUA Cong, ZHANG Hengde, Lü Mengyao, ZHANG Bihui
(National Meteorological Centre, Beijing 100081)
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投稿时间:2016-03-28    修订日期:2017-03-23
中文摘要: 文章基于L波段探空雷达秒数据,采用总理查森数法、逆温法和位温梯度法3种方法,计算北京2014年11—12月的边界层高度,并与罗氏法进行对比。结合各类要素垂直廓线和同时段PM2.5浓度数据,对2014年11月27日至12月1日、12月15—20日两次典型大气污染过程中上述4种方法边界层高度计算结果的异同点进行详细分析。研究结果表明:总理查森数法、逆温法和位温梯度法计算得出的北京地区平均边界层高度分别为653、1152和1296 m,且与PM2.5浓度呈现出不同程度的负相关关系。通过概率分布统计分析发现,北京冬季大气边界层高度在0~500 m的概率分布最大,但在其他高度区间分布上存在一定差异。结合两次典型大气污染过程发现,不同方法存在一定适用性和局限性,需结合气象要素的垂直分布和污染物浓度等情况加以主观判断,从而得到大气真实的边界层高度。
Abstract:The purpose of this study is to investigate boundary layer heights calculated by Richardson number method, inversion method and potential temperature gradient method, and compare them with Nozaki’s method based on L band radar sounding data in Beijing in November and December 2014. The similarities and differences of the boundary layer results calculated by the four methods during the two heavy pollution periods in 27 November to 1 December and 15-20 December 2014 are analyzed in details by using vertical profiles of meteorological elements and PM2.5 data in the same periods. The results show that the boundary layer heights calculated by Richardson number method, inversion method and potential temperature gradient method are 653 m, 1152 m and 1296 m in Beijing in November and December 2014 respectively, and the calculated boundary layer heights are negatively correlated with PM2.5 concentration in some degrees. The statistical probability results show that distribution of boundary layer heights below 500 m has the biggest probability, but there are some differences in other height ranges. Through the two typical heavy pollution periods, we found that different methods have applicability and limitation. Therefore, it is necessary to combine the vertical profiles of meteorological factors and pollutant concentrations with subjective judgment, which would help to determine the height of boundary layer.
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基金项目:公益性行业(气象)科研专项(GYHY201306015)、气象关键技术集成与应用重点项目(CMAGJ2014Z16)、雾 霾预报天气学研究及国家级雾 霾预报预警业务示范(2014BAC16B02)、科技部大气污染专项课题(2016YFC0203301)和公益性行业(环保)科研专项(201509001)共同资助
引用文本:
刘超,花丛,张恒德,吕梦瑶,张碧辉.L波段探空雷达秒数据在污染天气边界层分析中的应用[J].气象,2017,43(5):591-597.
LIU Chao,HUA Cong,ZHANG Hengde,Lü Mengyao,ZHANG Bihui.Application of L-Band Radar Sounding Data in Analyzing Polluted Weather Boundary Layer[J].METEOROLOGICAL MONTHLY,2017,43(5):591-597.