|Table of Contents|

Spatial-temporal Variation of Aerosol Optical Properties in Coastal Region, China Based on CALIPSO Data(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2021年第06期
Page:
1033-1049
Research Field:
水资源与环境
Publishing date:

Info

Title:
Spatial-temporal Variation of Aerosol Optical Properties in Coastal Region, China Based on CALIPSO Data
Author(s):
ZHANG Ling;  ZHENG Xiao-shen*
(College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, China)
Keywords:
aerosol;  AOD;  extinction coefficient;  particle depolarization ratio;  color ratio;  CALIPSO data;  AERONET data;  coastal region
PACS:
X513
DOI:
10.19814/j.jese.2021.04022
Abstract:
Aerosols can directly and indirectly affect atmospheric radiation, and thus have a significant impact on global climate. Based on AERONET data, CALIPSO aerosol optical depth was validated; and based on CALIPSO Level 2 data products from March 2010 to February 2020, the spatial-temporal distribution of aerosol optical properties in coastal region and two typical areas(Beijing-Tianjin region and Pearl River Delta region)were analyzed. The variation characteristics of aerosol optical properties in coastal region and two typical areas were obtained by analyzing aerosol optical depth, extinction coefficient, particle depolarization ratio and color ratio. The results show that: ① The aerosol optical depth has notable spatial-temporal distribution features and seasonal variation in coastal region, and the overall values have a higher distribution in the north than that in the south; the northern coastal region has the largest aerosol optical depth in summer, the southern has the largest value in spring, and the aerosol optical depth difference between north and south is the largest in summer.② The aerosol extinction coefficient in Tianjin and central Hebei areas at the northern costal region is large, and the extinction range is within the range of mainly below 4 km, and the aerosol color ratio and particle depolarization ratio are relatively large; the high value range of the aerosol extinction coefficient in autumn and winter in the central costal region is larger than that in the northern costal region; the aerosol extinction coefficient in the southern costal region is small in four seasons, and the extinction range is mainly below 2 km, and the aerosol particle depolarization ratio is relatively small, but the aerosol color ratio is large. ③ The aerosol optical depth in Beijing-Tianjin region is generally higher than that in Pearl River Delta region; Beijing-Tianjin region has the largest average aerosol optical depth in summer, and Pearl River Delta region has the largest average aerosol optical depth in spring; the overall aerosol optical depths in two typical regions show a downward trend. ④ The aerosol extinction coefficient in Beijing-Tianjin region is relatively large each year, and the high value of extinction coefficient is concentrated in summer of each year, and the extinction began to gradually decrease in 2017; the aerosol particle depolarization ratio and color ratio are relatively large, both of which generally show an increasing trend with the increase of height, indicating that it is mainly dominated by non-spherical large particle aerosols in the area. The aerosol extinction coefficient in Pearl River Delta region is generally smaller than that in Beijing-Tianjin region; the aerosol extinction coefficient in spring is larger, the aerosol particle depolarization ratio is relatively small, and the particles are spherical, but the aerosol color ratio is relatively large, indicating that the particles are relatively large.

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Last Update: 2021-11-10