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Short wave Aerosol Radiative Forcing estimates over a semi urban coastal environment in south-east India and validation with surface flux measurements

Short wave Aerosol Radiative Forcing estimates over a semi urban coastal environment in south-east India and validation with surface flux measurements

Authors :
B. V. Krishna Murthy
S. Suresh Babu
T. V. Lakshmi Kumar
K. Aruna
D. Narayana Rao
M. Venkat Ratnam
Source :
Atmospheric Environment. 125:418-428
Publication Year :
2016
Publisher :
Elsevier BV, 2016.

Abstract

The short wave direct Aerosol Radiative Forcing (ARF) at a semi urban coastal location near Chennai (12.81 °N, 80.03 °E, ∼45 m amsl), a mega city on the east coast of India has been estimated for all the four seasons in the year 2013 using the SBDART (Santa Barbara Discrete ordinate Atmospheric Radiative Transfer) model. As inputs to this model, measured aerosol parameters together with modeled aerosol and atmospheric parameters are used. The ARF in the atmosphere is found to be higher in the pre-monsoon and winter seasons compared to the other seasons whereas at the surface, it is found to be higher in the south-west (SW) monsoon and winter seasons. The estimated ARF values are compared with those reported over other locations in India. The effect of Relative Humidity on ARF has been investigated for the first time in the present study. It is found that the ARF increases with increasing RH in the SW monsoon and winter seasons. An unique feature of the present study is the comparison of the net surface short wave fluxes estimated from the model (SBDART) and measured fluxes using CNR 4 net radiometer. This comparison between the estimated and measured fluxes showed good agreement, providing a ‘closure’ for the estimates.

Details

ISSN :
13522310
Volume :
125
Database :
OpenAIRE
Journal :
Atmospheric Environment
Accession number :
edsair.doi...........4a25b924438f66a4398b81cb4cdbc34f
Full Text :
https://doi.org/10.1016/j.atmosenv.2015.08.085