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- Title
Spatio-temporal aerosol optical characteristics over the Arabian Sea during the pre monsoon season.
- Authors
Kaskaoutis, D. G.; Kalapureddy, M. C. R.; Devara, P. C. S.; Kosmopoulos, P. G.; Nastos, P. T.; Krishna Moorthy, K.; Kambezidis, H. D.
- Abstract
Ship-borne Aerosol Optical Depth (AOD) measurements obtained by a sunphotometer have been used to retrieve the Ångström wavelength exponent (α). These measurements were obtained in the Arabian Sea (AS), where the surrounded arid-region influence is expected, during the pre-monsoon season. Spectral variation of α is typically considered in this study. It is found that the polynomial fit becomes more accurate in the wavelength band 340-1020 nm rather than the 340-870 nm. The coarse-mode (positive curvature in the ln τα vs ln λ) aerosols are mainly depicted in the Northern part of the AS closely associated with the nearby arid areas and fine-mode aerosols are mainly observed over the far and coastal AS regions. In the study period the mean AOD at 500 nm is 0.246±0.114 and the α340-1020 is 0.904±0.186. The α340-870 exhibits similar values (0.924±0.179), while significant differences revealed for the constant terms of the polynomial fit (a1 and a2) proportionally to the wavelength band used for their determination. Observed day-to-day variability in the aerosol load and optical properties are direct consequence of the local winds and air-mass trajectories along with the position of the ship.
- Subjects
ARABIAN Sea; AEROSOLS; WAVELENGTHS; PHOTOMETRY; WINDS
- Publication
Atmospheric Chemistry & Physics Discussions, 2009, Vol 9, Issue 5, p22223
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acpd-9-22223-2009