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Diurnal cycle of the dust instantaneous direct radiative forcing over the Arabian Peninsula
File(s)
acp-15-9537-2015.pdf (1001.42 KB)
Published version
Author(s)
Osipov, S
Stenchikov, G
Brindley, H
Banks, J
Type
Journal Article
Abstract
In this study we attempted to better quantify radiative effects of dust over the Arabian Peninsula and their dependence on input parameters. For this purpose we have developed a stand-alone column radiation transport model coupled with the Mie, T-matrix and geometric optics calculations and driven by reanalysis meteorological fields and atmospheric composition. Numerical experiments were carried out for a wide range of aerosol optical depths, including extreme values developed during the dust storm on 18–20 March 2012. Comprehensive ground-based observations and satellite retrievals were used to estimate aerosol optical properties, validate calculations and carry out radiation closure. The broadband surface albedo, fluxes at the bottom and top of the atmosphere as well as instantaneous dust radiative forcing were estimated both from the model and observations. Diurnal cycle of the shortwave instantaneous dust direct radiative forcing was studied for a range of aerosol and surface characteristics representative of the Arabian Peninsula. Mechanisms and parameters responsible for diurnal variability of the radiative forcing were evaluated. We found that intrinsic variability of the surface albedo and its dependence on atmospheric conditions, along with anisotropic aerosol scattering, are mostly responsible for diurnal effects.
Date Issued
2015-08-27
Date Acceptance
2015-08-17
Citation
Atmospheric Chemistry and Physics, 2015, 15 (16), pp.9537-9553
URI
DOI
ISSN
1680-7324
Publisher
European Geosciences Union
Start Page
9537
End Page
9553
Journal / Book Title
Atmospheric Chemistry and Physics
Volume
15
Issue
16
Copyright Statement
© Author(s) 2015. This work is distributed
under the Creative Commons Attribution 3.0 License.
License URL
Subjects
Science & Technology
Physical Sciences
Meteorology & Atmospheric Sciences
OCEAN SURFACE ALBEDO
MINERAL DUST
SIZE DISTRIBUTION
SAHARAN DUST
OPTICAL-PROPERTIES
CLIMATE MODELS
MIDDLE-EAST
AEROSOL
SATELLITE
LONGWAVE
0401 Atmospheric Sciences
0201 Astronomical And Space Sciences
Publication Status
Published