Validation and Spatiotemporal Distribution of GEOS-5–Based Planetary Boundary Layer Height and Relative Humidity in China
Validation and Spatiotemporal Distribution of GEOS-5–Based Planetary Boundary Layer Height and Relative Humidity in China
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DOI：
10.1007/s00376-017-6275-3
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发表时间：
2018-02
影响因子：
5.8
通讯作者：
Yidan Si;Shenshen Li;Liangfu Chen;Chaoying Yu;Zifeng Wang;Yang Wang;Hongmei Wang
中科院分区：
文献类型：
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作者：
Yidan Si;Shenshen Li;Liangfu Chen;Chaoying Yu;Zifeng Wang;Yang Wang;Hongmei Wang
在中国，很少有研究专门针对行星边界层高度（PBLH）和相对湿度（RH）数据的验证和时空分布进行研究。在此分析中，利用2004年至2012年GEOS-5模拟的连续PBLH和地表RH数据，与地面观测数据进行了验证。总体而言，模拟的相对湿度与气象站统计数据基本一致，相关系数为0.78，斜率为0.9。然而，与LIDAR数据相比，模拟的PBLH被低估了大约两倍，这主要是因为夏末和初秋的模拟效果不佳。PBLH的强烈季节变化表现为夏季高，冬季低，这也与湍流垂直交换一致。不出意外，中国南方的相对湿度最高，而西北沙漠地区的相对湿度最低（小于30%）。季节上，华南地区变化不大，西北地区冬季湿度最高，春季湿度最低，其他地区的最大值出现在7 ~ 9月。
Few studies have specifically focused on the validation and spatiotemporal distribution of planetary boundary layer height (PBLH) and relative humidity (RH) data in China. In this analysis, continuous PBLH and surface-level RH data simulated from GEOS-5 between 2004 and 2012, were validated against ground-based observations. Overall, the simulated RH was consistent with the statistical data from meteorological stations, with a correlation coefficient of 0.78 and a slope of 0.9. However, the simulated PBLH was underestimated compared to LIDAR data by a factor of approximately two, which was primarily because of poor simulation in late summer and early autumn. We further examined the spatiotemporal distribution characteristics of two factors in four regions—North China, South China, Northwest China, and the Tibetan Plateau. The results showed that the annual PBLH trends in all regions were fairly moderate but sensitive to solar radiation and precipitation, which explains why the PBLH values were ranked in order from largest to smallest as follows: Tibetan Plateau, Northwest China, North China, and South China. Strong seasonal variation of the PBLH exhibited high values in summer and low values in winter, which was also consistent with the turbulent vertical exchange. Not surprisingly, the highest RH in South China and the lowest RH in desert areas of Northwest China (less than 30%). Seasonally, South China exhibited little variation, whereas Northwest China exhibited its highest humidity in winter and lowest humidity in spring, the maximum values in the other regions were obtained from July to September.