| 2012~2020年成都市不同等级能见度的时空分布特征 |
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| 引用本文： | 韦荣,张小玲,华明,党莹,姜雨彤,赵晨.2012~2020年成都市不同等级能见度的时空分布特征[J].高原山地气象研究,2022,42(4):136-145. |
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| 作者姓名： | 韦荣 张小玲 华明 党莹 姜雨彤 赵晨 |
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| 作者单位： | 1.成都信息工程大学大气科学学院/高原大气与环境四川省重点实验室, 成都 610225 |
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| 基金项目： | 国家重点研发计划课题（2018YFC0214002）；成都市科技局重点研发支撑计划课题（2020-YF09-00031-SN）；大学生创新创业训练计划项目（202010621004，202110621031） |
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| 摘 要： | 利用2012~2020年成都市气象站观测资料和环境空气质量监测数据，研究了该地区能见度时空演变规律以及不同等级能见度下气象要素和污染物浓度的关系。结果表明:（1）成都市近9 a年平均能见度呈上升趋势。四季平均能见度由高到低依次为夏季（12.25 km）、春季（10.82 km）、秋季（9.04 km）和冬季（6.33 km）。成都市能见度日变化呈单峰型分布特征，07时能见度最低，17时能见度最高。（2）能见度空间分布特征为东高西低且北高南低，中部中心城区最低。（3）成都市3 km以下低能见度出现频率为10.92%，3~5 km、5~10 km和10~20 km能见度出现频率分别为15.92%、24.95%和22.51%。（4）能见度上升与对应的PM2.5和PM10浓度、相对湿度减少以及风速增加有关。当能见度低于1 km时，多为高湿（RH>96%）低温（T<10.6℃）和小风速（<1.0 m/s）和高浓度（PM2.5>84.8 μg/m3，PM10>129.0 μg/m3）。
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| 关 键 词： | 能见度 时空分布 等级变化 影响因子 |
| 收稿时间： | 2021-11-28 |
Spatial and Temporal Distribution of Visibility at Different Levels in Chengdu from 2012 to 2020 |
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| Affiliation: | 1.School of Atmospheric Sciences/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, China2.Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan Province, Chengdu 610225, China3.Chengdu Meteorological Service, Chengdu 610072, China |
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| Abstract: | Based on the observation data of weather station and ambient air quality monitoring data in Chengdu from 2012 to 2020, the spatial and temporal evolution of visibility and the relationship between meteorological factors and pollutant concentration under different levels of visibility are studied. The results showed that: (1) The average visibility in Chengdu has been increased year by year in recent 9 years. The order of average visibility in four seasons is: summer (12.25 km), spring (10.82 km), autumn (9.04 km), and winter (6.33 km). The diurnal variation of visibility in Chengdu presented a single-peak distribution, with the lowest visibility at 07 am and the highest visibility at 17am. (2) The spatial distribution characteristics of visibility were high in the east and low in the west, high in the north and low in the south, with the lowest visibility in the central urban area. (3) The occurrence frequency of low visibility below 3 km was 10.92%, and the frequency of visibility below 3~5 km, 5~10 km and 10~20 km was 15.92%, 24.95% and 22.51%, respectively. (4) The increase of visibility was related to the corresponding PM2.5 and PM10 concentrations, the decrease of relative humidity and the increase of wind speed. When visibility is less than 1 km, the environment is usually characterized by high humidity (RH>96%), low temperature (T<10.6℃), low wind speed (<1.0m/s) and high pollutant concentration (PM2.5>84.8 μg/m3, PM10>129.0 μg/m3). |
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