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Effects of Particle Nonsphericity on Dust Optical Properties in a Forecast System: Implications for Model-Observation Comparison

Hoshyaripour, G. A.; Bachmann, V.; Förstner, J.; Steiner, A.; Vogel, H.; Wagner, F.; Walter, C.; Vogel, B.

Abstract (englisch):
Mineral dust is a key player in the Earth system that affects the weather and climate through absorbing and scattering the radiation. Such effects strongly depend on the optical properties of the particles that are in turn affected by the particle shape. For simplicity, dust particles are usually assumed to be spherical. But this assumption can lead to large errors in modeling and remote sensing applications. This study investigates the impact of dust particle shape on its direct radiative effect in a next‐generation atmospheric modeling system ICON‐ART (ICOsahedral Nonhydrostatic weather and climate model with Aerosols and Reactive Trace gases) to verify if accounting for nonsphericity enhances the model‐observation agreement. Two sets of numerical experiments are conducted by changing the optical shape of the particles: one assuming spherical particles and the other one assuming a mixture of 35 randomly oriented triaxial ellipsoids. The simulations are compared to MISR (Multiangle Imaging Spectroradiometer), AERONET (Aerosol Robotic Network), and CALIPSO (Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observation) observations (with focus on North Africa). ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000096670
Veröffentlicht am 29.07.2019
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Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 0148-0227, 2156-2202, 2169-897X, 2169-8996
KITopen-ID: 1000096670
Erschienen in Journal of geophysical research / D
Band 124
Heft 13
Seiten 7164-7178
Vorab online veröffentlicht am 07.06.2019
Nachgewiesen in Scopus
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