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Radiative transfer calculations for a passive microwave satellite sensor: comparing a fast model and a line-by-line model
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik.ORCID-id: 0000-0001-6389-1160
Universität Bremen, Institute of Environmental Physics.
University of Miami, Rosenstiel School of Marine and Atmospheric Sciences, Miami.
2006 (Engelska)Ingår i: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 111, nr 20, 20304- s.Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

[1] A comparison between the fast radiative transfer model Radiative Transfer for the TIROS Operational Vertical Sounder (RTTOV-7) and the physical radiative transfer model Atmospheric Radiative Transfer Simulator ( ARTS) was carried out. Radiances were simulated for the sounding channels of the Advanced Microwave Sounding Unit B (AMSU-B) for the whole globe for a single time of a single day ( 1 January 2000, 0000 UT). Temperature, pressure, and specific humidity profiles from the reanalysis data set ERA-40 of the European Centre for Medium-Range Weather Forecasts (ECMWF) were used as input for both models; geopotential height profiles were also used but only as input for ARTS. The simulations were made for two different surface emissivities, 0.60 and 0.95. The low surface emissivity case exhibits the larger radiance differences. Although the global values of the mean difference and standard deviation are small ( for example, the global mean difference for channel 18 is 0.014 K and the standard deviation is 0.232 K), the examination of the geographical distribution of the differences shows that large positive or negative values are observed over dry regions of high northern and southern latitudes and over dry elevated regions. The origin of these differences was found to be due to errors introduced by the transmittance parametrization used in RTTOV.

Ort, förlag, år, upplaga, sidor
2006. Vol. 111, nr 20, 20304- s.
Nationell ämneskategori
Rymd- och flygteknik
Forskningsämne
Rymdteknik
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URN: urn:nbn:se:ltu:diva-9391DOI: 10.1029/2005JD006552Lokalt ID: 80151430-f4b3-11db-ac9f-000ea68e967bOAI: oai:DiVA.org:ltu-9391DiVA: diva2:982329
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Validerad; 2006; 20070427 (pafi)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2017-10-19Bibliografiskt granskad

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