基于太阳光度计的兰州市秋季气溶胶光学特性

刘慧; 余晔; 夏敦胜; 赵素平

doi:10.7522/j.issn.1000-0534.2019.00057

高原气象 >

2020 , Vol. 39 >Issue 1: 204 - 212

DOI: https://doi.org/10.7522/j.issn.1000-0534.2019.00057

论文

基于太阳光度计的兰州市秋季气溶胶光学特性

刘慧 ,
余晔 ,
夏敦胜 ,
赵素平

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1. 中国科学院西北生态环境资源研究院/中国科学院寒旱区陆面过程与气候变化重点实验室, 甘肃兰州 730000 2. 兰州大学资源环境学院西部环境教育部重点实验室, 甘肃兰州 730000 3. 中国科学院平凉陆面过程与灾害天气观测研究站, 甘肃平凉 744015 4. 甘肃省陆面过程与灾害天气野外科学观测研究站, 甘肃平凉;744015

收稿日期: 2019-03-29

网络出版日期: 2020-02-28

基金资助

国家自然科学基金项目(41605103)

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Analysis on Autumn Aerosol Optical Characteristics at Lanzhou with Sun-photometer

Hui LIU ,
Ye YU ,
Dunsheng XIA ,
Suping ZHAO

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1. Key Laboratory of Land Surface Process & Climate Change in Clod & Arid Regions, the Northwest Institute of Eco?Environment and Resources (NIEER), Chinese Academy of Sciences (CAS), Lanzhou 730000, Gansu, China;2. Key Laboratory of Western China’s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Gansu, China

Received date: 2019-03-29

Online published: 2020-02-28

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摘要

利用2015年9 -11月兰州市CE318太阳光度计地基观测数据, 反演了这期间气溶胶光学厚度(Aerosol Optical Depth, AOD)、 Angstrom波长指数(α)、大气浑浊度系数(β)等气溶胶光学特性参数, 研究了兰州市秋季气溶胶光学特性的时间变化特征, 并根据Angstrom阈值范围和图解分析法对兰州市气溶胶主要类型及其分布特征进行分析。结果表明: 兰州市秋季AOD_{500 nm}均值为0.47±0.22。10月α _{440~870 nm}最小, 为0.95±0.26; 9月α _{440~870 nm}最大, 为1.21±0.14。9月大气浑浊度系数最低, 为0.15±0.05; 11月最高, 为0.28±0.12。AOD秋季日变化较小, AOD_{500 nm}变化范围在0.27~0.52之间。2015年9 -10月AOD_{500 nm}集中在0.2~0.6之间, 11月AOD_{500 nm}集中在0.4~0.8之间, 说明兰州市2015年秋季AOD_{500 nm}分布较为集中, 大气气溶胶含量逐月增加。9月波长指数集中在1.0~1.4之间, 峰值中心在1.2~1.4区间; 10月波长指数主要集中在0.6~0.8和1.0~1.2两个区间; 11月波长指数集中在1.0~1.4区间。总体来看, 兰州市秋季气溶胶以细粒子为主。AOD_{500 nm}与β显著相关, 大气光学厚度与大气浑浊度系数均能表征大气污染程度。兰州市秋季气溶胶主要类型为细颗粒模态下的人为源和混合型气溶胶, 分布特征表现为高AOD时受细颗粒气溶胶的吸湿增长影响, 其中细颗粒吸湿增长是兰州市秋季气溶胶光学厚度偏高的主要原因。

关键词： 太阳光度计; 气溶胶光学特性; 气溶胶光学厚度; 兰州市

本文引用格式

刘慧 , 余晔 , 夏敦胜 , 赵素平 . 基于太阳光度计的兰州市秋季气溶胶光学特性[J]. 高原气象, 2020 , 39(1) : 204 -212 . DOI: 10.7522/j.issn.1000-0534.2019.00057

Abstract

Aerosol optical properties including aerosol optical depth (AOD), Angstrom wavelength index (α), and atmospheric turbidity coefficient (β) were inferred from the ground?based solar photometer observation data in Lanzhou from September to November 2015.The distribution and variation of aerosol optical properties were analyzed.Types and distribution of aerosols were derived based on Angstrom range and graphical method.The results show that the average AOD_{500 nm} in autumn in Lanzhou City is 0.47±0.22.α _{440~870 nm} was the lowest in October (0.95±0.26) and the highest in September (1.21±0.14).β is the lowest in September (0.15±0.05) and the highest in November (0.28±0.12).The daily variation of AOD_500nm ranges from 0.27 to 0.52.During September and October 2015, AOD_{500 nm} mainly distributed between 0.2~0.6.In November, AOD_{500 nm} is concentrated between 0.4~0.8, indicating that the distribution of AOD_{500 nm} in Lanzhou in autumn is concentrated, and loading of aerosols increased from September to November.The wavelength index is mainly distributed between 1.0~1.4, 0.6~0.8, and 1.0~1.4 in September, October and November, respectively, with peaks between 1.2~1.4 and 1.0~1.2.Overall, aerosol in autumn is dominated by fine particle aerosols in Lanzhou.AOD_500nm is significantly correlated with β, and both aerosol optical depth and turbidity coefficient can characterize the degree of turbidity.The main types of aerosols in autumn are anthropogenic and mixed aerosols in fine particle mode.The hygroscopic growth of fine particle aerosol is the main reason for the high aerosol optical depth in autumn for Lanzhou City.

Key words： Sun photometer; aerosol optical prop; aerosol optical dept; Lanzhou city

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