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1Recent Developments in Assimilation of Satellite Data in the MSC 4D-Var Analysis and Forecast System

Stephen Macpherson,Louis Garand,Josep M. Aparicio,Mark Buehner,G. Deblonde,Martin Charron,Michel Roch,Cécilien Charette,A. Beaulne

In May 2008, several important changes with respect to satellite data assimilation were made to the Meteorological Service of Canada (MSC) operational global 4D-Var Data Assimilation and Forecast System (DAFS). At the same time, a new version of the MSC DAFS has been developed which uses a new version of the MSC Global Environmental Multiscale (GEM) model called GEM-Strato. The GEMStrato model incorporates several significant changes to the current version of the model, including a lid raised from 10 hPa (~30 km) to 0.1 hPa (~65 km). The new system, scheduled to replace the current system in 2009, allows for assimilation of additional radiance data from higher-peaking microwave and infrared instrument channels as well as GPS radio-occultation data up to 40 km (~3 hPa). This paper describes the recent changes in satellite data assimilation in the operational DAFS, and presents results of satellite data impact experiments with the new GEM-Strato system. In addition, the performance of the operational DAFS and the new GEM-Strato system are compared. Finally, future plans for satellite data assimilation are presented, which include assimilation of data from the EUMETSAT satellites METOP (AMSU-A, MHS, IASI, GRAS, ASCAT) and METEOSAT.

2010引用：23

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2Impact of combined AIRS and GPS-RO data in the new version of the Canadian global forecast model

L. Garand,J. Aparicio,M. Buehner,G. Deblonde,M. Charron,M. Roch,C. Charette,A. Beaulne,S. Macpherson

Environment Canada is currently planning to raise the lid of its operational global forecast model GEM (Global Environmental Multiscale) from 10 hPa (~30 km) to 0.1 hPa (~60 km) in the first quarter of 2009. The new version is called GEM-Strato. This project has several major components: changes to the model physics, new vertical coordinate, new background error statistics, and additional data types for the assimilation system. These include AMSU-A stratospheric channels 11-14 in addition to data types recently implemented operationally: AIRS and SSM/I radiances and Quickscat oceanic winds. This paper presents results on the impact of the new model configuration, followed by that of adding the new data types mentioned above, and that from GPS-RO refractivity profiles in the variational assimilation system.

2008

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