Abstract
Based on the Langley method and the EuroSkyRad (ESR) pack retrieval scheme, we carried out the retrieval of the aerosol properties for the CE–318 sunphotometer observation data from March 2012 to February 2014 in Kunming, China, and we explored the possible mechanisms of the seasonal variations. The seasonal variation of the aerosol optical depth (AOD) was unimodal and reached a maximum in summer. The retrieval analysis of the Angstrom exponent (α) showed the aerosol types were continental, biomass burning (BB), and urban/industrial (UI); the content of the desert dust (DD) was low, and it may have contained a sea–salt (SS) aerosol due to the influence of the summer monsoon. All the aerosol particle spectra in different seasons showed a bimodal structure. The maximum and submaximal values were located near 0.2 μm and 4 μm, respectively, and the concentration of the aerosol volume was the highest in summer. In summer, aerosol particles have a strong scattering power but a weak absorption power; this pattern is the opposite in winter. The synergistic effect of the East Asian monsoon and the South Asian monsoon seasonal oscillations can have an important impact on the variation of the aerosol properties. The oscillation variation characteristic of the total vertical columnar water vapor (CWV) and the monsoon index was completely consistent. The aerosol types and sources in the Yunnan–Kweichow Plateau and the optical radiation properties were closely related to the monsoon circulation activities during different seasons and were different from other regions in China.
Highlights
The complexity of aerosol sources determines the diversity of the composition types and particle sizes, and it has important effects on the weather, climate, air quality, and human health
This paper explores the relationship between the seasonal and interannual variation characteristics of the East Asian monsoon and South Asian monsoon and the variation of the aerosol optical radiation properties, which were based on the combination of the aerosol properties retrieved from the CE–318 observation data from the Kunming Atmospheric Ozone Monitoring Station, No 209 of the Global Ozone Observing System (GO3OS), and the monsoon circulation index
The aerosol optical depth (AOD) decreases with the increase of λ and is consistent with the typical Mie scattering properties
Summary
The complexity of aerosol sources (primary and aged aerosol) determines the diversity of the composition types and particle sizes, and it has important effects on the weather, climate, air quality, and human health. Its geographical location (it is adjacent to Southeast Asia and South Asia, and it is an important source of aerosols in southwest China due to the strong influence of the monsoon circulation) [33,34] and climate (the annual temperature difference is small and the daily range is large, the dry season and wet season are distinct, and the sunshine and ultraviolet radiation are strong) are unique. It is an important path for water vapor transport of convection and advection in China. It is important to know and understand the aerosol variation and monsoon activities in the Yunnan–Kweichow Plateau and their impact on the environment and climate in specific areas
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