Decreasing atmospheric visibility associated with weakening winds from 1980 to 2017 over China
Decreasing atmospheric visibility associated with weakening winds from 1980 to 2017 over China
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1980年至2017年中国上空风力减弱导致大气能见度下降
DOI：
10.1016/j.atmosenv.2020.117314
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发表时间：
2020-03
影响因子：
5
通讯作者：
Cao Lijuan
中科院分区：
文献类型：
--
作者：
Zhang Yong;Gao Lina;Cao Lijuan
利用中国气象站网的大气能见度订正资料，分析了1980-2017年中国大气能见度的气候特征和变化。分析了近地面到对流层（850 ~ 200 hPa）的风速（WS）与AV的关系。全国582个合格站平均能见度为22.03 km，夏季最高（25.37 km），冬季最低（18.92 km）。自20世纪80年代以来，中国大部分台站和各季节的年平均AV都呈下降趋势。大多数地区的空气质量指数在2005年以前主要呈下降趋势，而近年来呈上升趋势，这可能与中国的减排政策有关。四季中，风速与近地面风速呈显著正相关，夏季相关系数最大，为0.84，冬季最小。除部分内陆沙漠地区外，我国大部分地区对流层低层的风切变率与风切变率也存在正相关关系。此外，还分析了中国各站的WS、地面温度（T）、相对湿度（RH）和地面气压（Ps）的长期变化趋势。结果表明，WS的降低和T的增加可以很好地解释AV的降低趋势。RH和Ps的变化至少不是主要驱动因素。总体而言，“最好”（“最坏”）的能见度对应于最大（最小）WS近地面和在对流层低层，但这种对应关系往往向上层对流层翻转。
This paper presents the climatology and changes in atmospheric visibility (AV) in China during 1980–2017 based on adjusted data from an extended station network. The relationships between AV and the wind speed (WS) from the near surface to the troposphere (850 hPa to 200 hPa) are analysed. The mean visibility at 582 qualified stations in China is 22.03 km, with the highest in summer (25.37 km) and lowest in winter (18.92 km). The annual mean AV has decreased at most stations and all seasons across China since the 1980s. Most regions show a decreasing AV trend mainly before 2005 and an increasing trend in recent years, possibly related to the emission reduction policies in China. The AV has a significant positive correlation with the near-surface WS in all seasons, with the largest correlation coefficient of 0.84 in summer and the smallest in winter. The AV also has a positive correlation with the WS in the lower troposphere in most of China, except in some inland desert regions. Additionally, the long-term trends of WS, surface temperature (T), relative humidity (RH) and surface pressure (Ps) were analysed at each station across China. The results show that both decreasing WS and increasing T could well account for the decreasing trend in AV. The changes in RH and Ps are at least not the main drivers. Overall, the “best” (“worst”) visibility corresponds to the largest (smallest) WS near the ground and in the lower troposphere, but such correspondence tends to overturn towards the upper troposphere.
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影响因子：
2.3
作者：
Wang Hui-Jun;Chen Huo-Po;Liu Jiping
通讯作者：
Liu Jiping
影响因子：
--
作者：
R. J. Blackham
通讯作者：
R. J. Blackham
DOI：
10.1073/pnas.1900125116
发表时间：
2019-04-30
影响因子：
11.1
作者：
An, Zhisheng;Huang, Ru-Jin;Ji, Yuemeng
通讯作者：
Ji, Yuemeng
DOI：
--
发表时间：
2007
期刊：
--
影响因子：
--
作者：
通讯作者：
--
影响因子：
64.8
作者：
Huang, Ru-Jin;Zhang, Yanlin;Prevot, Andre S. H.
通讯作者：
Prevot, Andre S. H.