Abstract

ABSTRACT Based on the particle linear depolarization ratio (PLDR) and single-scattering albedo (SSA) values obtained for 1020 nm from Aerosol Robotic Network (AERONET) Version 3 Level 2.0 data collected in five regions, namely, northern China, Northwest Asia, the Tibetan Plateau, southern China and Southeast Asia, we classified seven types of aerosol (viz., purely dust, dust-dominated, pollution-dominated, non-absorbing [NA], weakly absorbing [WA], moderately absorbing [MA] and strongly absorbing [SA]) in order to assess the spatial and temporal distributions of their constituents and the radiative effects of their fine- and coarse-mode particles. The fine fraction dominated in northern China and also played a crucial role on the Tibetan Plateau and in southern China and Southeast Asia, whereas the coarse fraction prevailed in Northwest Asia. Furthermore, the fine-mode aerosol on the Tibetan Plateau exhibited its maximum radiative forcing efficiency (110.3 W m–2) during high concentrations of SA aerosol. Also, the lowest values for both the radiative forcing and the radiative forcing efficiency in southern China occurred during summer. Finally, the various aerosol constituents displayed distinct spatial and temporal distributions in Southeast Asia, with the SA aerosol contributing approximately 20% of the total aerosol on the Indochinese Peninsula and the NA and WA aerosol forming the largest percentages on the Malay Peninsula.

Highlights

  • Based on the particle linear depolarization ratio (PLDR) and single-scattering albedo (SSA) values obtained for 1020 nm from Aerosol Robotic Network (AERONET) Version 3 Level 2.0 data collected in five regions, namely, northern China, Northwest Asia, the Tibetan Plateau, southern China and Southeast Asia, we classified seven types of aerosol in order to assess the spatial and temporal distributions of their constituents and the radiative effects of their fine- and coarse-mode particles

  • We analyzed the distribution of aerosol optical depth (AOD), AE, fine-mode AOD, coarse-mode AOD, absorption aerosol optical depth (AAOD), AAE in Figs. 3 and 4, to investigate the optical radiative properties of aerosol in each region; the AOD, fine and coarse-mode AOD, AAOD are all from 440 nm, while the AE and AAE are in the wavelength of 440–870 nm

  • AAOD measures the quantity of absorptive aerosol in the air; a large value of AAOD is corresponding to high concentration of absorptive aerosol in the air

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Summary

Introduction

In addition to affecting Earth’s radiation balance budget through scattering or absorption of radiation, atmospheric aerosol impacts the regional and global climate (Zhang et al, 1998a, b; Zhu et al, 2014b; Gui et al, 2017). Aerosol causes scattering and absorption of radiation which exerts a cooling or warming effect on the atmosphere, and it has an impact on the atmospheric radiation

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