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RISVariational Four-dimensional Analysis Using Quasi-Geostrophic Constraints
Publisher: American Meteorological Society
Abstract: A variational four-dimensional analysis technique using quasi-geostrophic models as constraints is examined using gridded fields as data. The analysis method uses a standard iterative nonlinear minimization technique to ...
A Variational Continuous Assimilation Technique
Publisher: American Meteorological Society
Abstract: A variational assimilation technique is presented which continuously adjusts a model solution by introducing a correction term to the model equations. The technique is essentially a modification of the adjoint technique. ...
Assimilation of SSM/I Radiances in the NCEP Global Data Assimilation System
Publisher: American Meteorological Society
Abstract: A technique for the assimilation of Special Sensor Microwave Imager (SSM/I) data in the National Centers for Environmental Prediction (NCEP) global data assimilation and forecast system is described. Because the radiative ...
The National Meteorological Center's Spectral Statistical-Interpolation Analysis System
Publisher: American Meteorological Society
Abstract: At the National Meteorological Center (NMC), a new analysis system is being extensively tested for possible use in the operational global data assimilation system. This analysis system is called the spectral statistical- ...
The Use of TOVS Cloud-Cleared Radiances in the NCEP SSI Analysis System
Publisher: American Meteorological Society
Abstract: With improved assimilation techniques, it is now possible to directly assimilate cloud-cleared radiances, rather than temperature and moisture retrievals, in objective analyses. The direct use of the cloud-cleared radiances ...
The New Global Operational Analysis System at the National Meteorological Center
Publisher: American Meteorological Society
Abstract: At the National Meteorological Center (NMC), a new analysis system was implemented into the operational Global Data Assimilation System on 25 June 1991. This analysis system is referred to as Spectral Statistical Interpolation ...
Impact Study of AMSR-E Radiances in the NCEP Global Data Assimilation System
Publisher: American Meteorological Society
Abstract: The impact of radiance observations from the Advanced Microwave Scanning Radiometer for Earth Observing System (AMSR-E) was investigated in the National Centers for Environmental Prediction (NCEP) Global Data Assimilation ...
An Evaluation of Soundings, Analyses and Model Forecasts Derived from TIROS-N and NOAA-6 Satellite Data
Publisher: American Meteorological Society
Abstract: Evaluations of operational TIROS-N and NOAA-6 temperature soundings over North America are presented for an early January 1980 period one month after completion of the First GARP Global Experiment. In addition to collocated ...
Introduction of the GSI into the NCEP Global Data Assimilation System
Publisher: American Meteorological Society
Abstract: At the National Centers for Environmental Prediction (NCEP), a new three-dimensional variational data assimilation (3DVAR) analysis system was implemented into the operational Global Data Assimilation System (GDAS) on 1 ...
Improving Incremental Balance in the GSI 3DVAR Analysis System
Publisher: American Meteorological Society
Abstract: The gridpoint statistical interpolation (GSI) analysis system is a unified global/regional three-dimensional variational data assimilation (3DVAR) analysis code that has been under development for several years at the ...