Trends of Planetary Boundary Layer Height Over Urban Cities of China From 1980-2018
Trends of Planetary Boundary Layer Height Over Urban Cities of China From 1980-2018
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DOI：
10.3389/fenvs.2021.744255
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发表时间：
2021-09-16
影响因子：
4.6
通讯作者：
Kulmala, Markku
中科院分区：
文献类型：
--
作者：
Huo, Yanfeng;Wang, Yonghong;Kulmala, Markku
边界层高度（BLH）是气候学和大气污染研究中的一个重要参数，特别是在城市中。本文利用欧洲中期天气预报中心（ECMWF）的ERA-interim数据，与2010-2018年中国东部两个气象站的探空数据仔细验证后，采用批量理查德森数（Ri）法计算了1980-2018年中国城市的BLH。两类数据间的BLH值的相关系数在0.65 ~ 0.87之间，说明从ERA数据集分析BLH的长期趋势是合理的。利用ERA-interim计算的地表温度，我们发现中国东部大部分城市的日间地表温度有增加的趋势，尤其是在春季。大气边界层与温度、风速、相对湿度和能见度的相关分析表明，中国东部高污染地区大气气溶胶浓度和气象参数的变化对大气边界层的发展起着重要作用。
Boundary layer height (BLH) is an important parameter in climatology and air pollution research, especially in urban city. We calculated the BLH with a bulk Richardson number (Ri) method over urban cities of China during 1980-2018 using European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-interim data after carefully validation with sounding data obtained from two meteorology stations in eastern China during 2010-2018. The values of BLH between these two types of data have correlation coefficients in the range of 0.65-0.87, which indicates that it is reasonable to analyze long-term trends of the BLH from ERA data sets. Using ERA-interim calculated BLH, we found that there is an increasing trend in the daytime BLH in most cities of eastern China, particularly during the spring season. A correlation analysis between the BLH and temperature, wind speed, relative humidity and visibility revealed that the variability in meteorological parameters, as well as in aerosol concentrations over highly polluted eastern China, play important roles in the development of the BLH.