HR: 0800h
AN: A11C-0065 [Abstracts]
TI: Global shortwave aerosol direct radiative forcing from MODIS measurements for mineral dust, marine
aerosol, biomass-burning and industrial pollution.
AU: * Bellouin, N
EM: nicholas.bellouin@metoffice.gov.uk
AF: Laboratoire d'Optique Atmospherique, Batiment P5
USTL, Villeneuve d Ascq, 59655
France
AU: * Bellouin, N
EM: nicholas.bellouin@metoffice.gov.uk
AF: Met Office, FitzRoy Road
, Exeter, EX13PB
United Kingdom
AU: Boucher, O
EM: boucher@loa.univ-lille1.fr
AF: Laboratoire d'Optique Atmospherique, Batiment P5
USTL, Villeneuve d Ascq, 59655
France
AU: Haywood, J
EM: jim.haywood@metoffice.gov.uk
AF: Met Office, FitzRoy Road
, Exeter, EX13PB
United Kingdom
AB:
The shortwave aerosol direct radiative effect results from the extinction of incoming solar radiation by atmospheric
particles, through scattering and absorption. This effect has been studied globally using general circulation models,
satellite instruments, and locally using in-situ ground-based or airborne measurements as well as sunphotometry. Here, we
present a method to identify the aerosol type using the aerosol optical thickness and the ratio of accumulation-mode to total
optical thickness retrieved by the MODerate resolution Imaging Spectroradiometer (MODIS) instrument, the aerosol index
estimated from the Total Ozone Mapping Spectrometer (TOMS) instrument, and the surface wind speeds derived from the Special
Sensor Microwave Imager (SSM/I) instrument. Estimates of the direct radiative forcing are then performed from this aerosol
classification and single scattering properties from AERONET using appropriate radiative transfer and surface albedo. We will
present the aerosol direct radiative forcing for mineral dust, marine aerosol, biomass-burning aerosol and industrial
pollution for the period September 2000 to August 2001, over both oceanic and land surfaces, with the exception of bright
surfaces such as deserts and snow-covered areas.
DE: 3359 Radiative processes
DE: 1610 Atmosphere (0315, 0325)
DE: 1640 Remote sensing
DE: 0305 Aerosols and particles (0345, 4801)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting