Journal
INFRARED PHYSICS & TECHNOLOGY
Volume 89, Issue -, Pages 304-314Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.infrared.2018.01.024
Keywords
Aerosol optical depth; Angstrom exponent; Radiative forcing; Weather condition
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Funding
- National Natural Science Foundation of China [51406033, 51406041]
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The aerosol optical properties and radiative effect under different weather conditions in Harbin (126.63 degrees E, 45.75 degrees N) were analyzed based on ground-based Sun/Sky radiometric (CE-318) measurements during September 2016-April 2017. The means values of aerosol optical depth (AOD(500)) and Angstrom exponent (AE(440-870)) were 0.37 +/- 0.27 and 1.08 +/- 0.33, respectively. The mean AOD(500) under four weather conditions are apparently higher in severe pollution (Se-Po) days (0.80 +/- 0.31) and moderate pollution (Mo-Po) days (0.53 +/- 0.25) but lower in slight pollution (SI-Po) days (0.37 +/- 0.26) and no pollution (No-Po) days (0.26 +/- 0.20), while the mean values of AE(440-870) maintain high, varying from 0.98 to 1.25. The higher AE(440-870) indicated that the air quality in Harbin is mainly affected by aerosols originated from anthropogenic sources. The daily values of shortwave (0.25-4 mu m) direct aerosol radiative forcing (DARF) at top/bottom of atmosphere (TOA/BOA) were estimated through Santa Barbara DISORT Atmosphere Radiative Transfer (SBDART) model. Further, the aerosol radiative forcing efficiency (ARFE), radiation flux (RF) and atmosphere heating rate (HR) in Harbin were also estimated by the SBDART model. (C) 2018 Elsevier B.V. All rights reserved.
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