Assimilating AMSU-A over Sea Ice in HIRLAM 3D-Var
In the IOMASA project, Norwegian Meteorological Institute (met.no) and partners develop methods for assimilating AMSU-A brightness temperatures above sea ice surfaces in HIRLAM 3D-Var. Methods that are currently developed at met.no for exploiting microwave soundings over ice surfaces are presented,...
| Main Authors: | , , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.492.2815 http://cimss.ssec.wisc.edu/itwg/itsc/itsc14/proceedings/A26_Thyness.pdf |
| Summary: | In the IOMASA project, Norwegian Meteorological Institute (met.no) and partners develop methods for assimilating AMSU-A brightness temperatures above sea ice surfaces in HIRLAM 3D-Var. Methods that are currently developed at met.no for exploiting microwave soundings over ice surfaces are presented, with focus on estimating surface emissivities. As a first approach, typical emissivity values for First Year and Multi Year ice are used in combination with the ice concentration products from the EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF) to estimate the emissivity of each AMSU-A footprint. The calculated surface emissivities are given to the forward model RTTOV7. Some preliminary results from impact studies with HIRLAM 3D-Var are also presented. With the current model setup, the AMSU-A observations contribute slightly positive to the forecast quality of the HIRLAM20 model at met.no. |
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