Imperial College London

Dr Helen Brindley

Faculty of Natural SciencesDepartment of Physics

Reader in Earth Observation
 
 
 
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Contact

 

+44 (0)20 7594 7673h.brindley

 
 
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Location

 

717Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Banks:2018:10.5194/acp-18-9681-2018,
author = {Banks, JR and Schepanski, K and Heinold, B and Huenerbein, A and Brindley, HE},
doi = {10.5194/acp-18-9681-2018},
journal = {ATMOSPHERIC CHEMISTRY AND PHYSICS},
pages = {9681--9703},
title = {The influence of dust optical properties on the colour of simulated MSG-SEVIRI Desert Dust infrared imagery},
url = {http://dx.doi.org/10.5194/acp-18-9681-2018},
volume = {18},
year = {2018}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Satellite imagery of atmospheric mineral dust is sensitive to the optical properties of the dust, governed by the mineral refractive indices, particle size, and particle shape. In infrared channels the imagery is also sensitive to the dust layer height and to the surface and atmospheric environment. Simulations of mineral dust in infrared "Desert Dust" imagery from the Spinning Enhanced Visible and InfraRed Imager (SEVIRI) have been performed, using the COSMO-MUSCAT (COSMO: COnsortium for Small-scale MOdelling; MUSCAT: MUltiScale Chemistry Aerosol Transport Model) dust transport model and the Radiative Transfer for TOVS (RTTOV) program, in order to investigate the sensitivity of the imagery to assumed dust properties. This paper introduces the technique and performs initial validation and comparisons with SEVIRI measurements over North Africa for daytime hours during 6 months covering June and July of 2011–2013. Using T-matrix scattering theory and assuming the dust particles to be spherical or spheroidal, wavelength- and size-dependent dust extinction values are calculated for a number of different dust refractive index databases, along with several values of the particle aspect ratio, denoting the particle shape. The consequences for the infrared extinction values of both the particle shape and the particle orientation are explored: this analysis shows that as the particle asphericity increases, the extinctions increase if the particles are aligned horizontally, and decrease if they are aligned vertically. Randomly oriented spheroidal particles have very similar infrared extinction properties as spherical particles, whereas the horizontally and vertically aligned particles can be considered to be the upper and lower bounds on the extinction values. Inputting these values into COSMO-MUSCAT-RTTOV, it is found that spherical particles do not appear to be sufficient to describe fully the resultant colour of the dust in the infrared imagery. Comparisons
AU - Banks,JR
AU - Schepanski,K
AU - Heinold,B
AU - Huenerbein,A
AU - Brindley,HE
DO - 10.5194/acp-18-9681-2018
EP - 9703
PY - 2018///
SN - 1680-7316
SP - 9681
TI - The influence of dust optical properties on the colour of simulated MSG-SEVIRI Desert Dust infrared imagery
T2 - ATMOSPHERIC CHEMISTRY AND PHYSICS
UR - http://dx.doi.org/10.5194/acp-18-9681-2018
UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000438156100001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR - http://hdl.handle.net/10044/1/62218
VL - 18
ER -