3-D polarised simulations of space-borne passive mm/sub-mm midlatitude cirrus observations: a case study
2007 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 7, no 15, 4149–4158- p.Article in journal (Refereed) Published
Global observations of ice clouds are needed to improve our understanding of their impact on earth's radiation balance and the water-cycle. Passive mm/sub-mm has some advantages compared to other space-borne cloud-ice remote sensing techniques. The physics of scattering makes forward radiative transfer modelling for such instruments challenging. This paper demonstrates the ability of a recently developed RT code, ARTS-MC, to accurately simulate observations of this type for a variety of viewing geometries corresponding to operational (AMSU-B, EOS-MLS) and proposed (CIWSIR) instruments. ARTS-MC employs an adjoint Monte-Carlo method, makes proper account of polarisation, and uses 3-D spherical geometry. The actual field of view characteristics for each instrument are also accounted for. A 3-D midlatitude cirrus scenario is used, which is derived from Chilbolton cloud radar data and a stochastic method for generating 3-D ice water content fields. These demonstration simulations clearly demonstrate the beamfilling effect, significant polarisation effects for non-spherical particles, and also a beamfilling effect with regard to polarisation.
Place, publisher, year, edition, pages
2007. Vol. 7, no 15, 4149–4158- p.
Research subject Space Technology
IdentifiersURN: urn:nbn:se:ltu:diva-11181DOI: 10.5194/acp-7-4149-2007Local ID: a16edbd0-8ea4-11dc-a188-000ea68e967bOAI: oai:DiVA.org:ltu-11181DiVA: diva2:984130
Validerad; 2007; 20071109 (sbuehler)2016-09-292016-09-292017-01-19Bibliographically approved