[Proflist] At 2PM Today: JCSDA Seminar, Tomislava Vukicevic

[George Ohring]

JCSDA Seminars are now webcast. See details below.

* *

	

*JCSDA Seminar*

*Title*

	

*Data Assimilation of Cloud-Affected Radiances*

*Speaker*

	

*Tomislava Vukicevic
**Atlantic Oceanographic and Meteorological Laboratory (AOML), Oceanic 
and Atmospheric Research (OAR), NOAA*

*Date,  Time & Place*

	

*Wednesday, January 6, 2010
*2:00 -- 3:00 P.M.
World Weather Building, *Room 707*, 5200 Auth Road, Camp Springs, MD 20746

*Abstract*

	

A summary of research results on assimilation of GOES (Geostationary 
Operational Environmental Satellites) Imager observations into a cloud 
resolving model will be presented. The purpose of the research is to 
evaluate feasibility of atmospheric data analysis with clouds.  The 
studies were performed using a research data assimilation algorithm 
designated Regional Atmospheric Modeling and Data Assimilation System 
(RAMDS) that was developed at CIRA (Cooperative Institute for Research 
in the Atmosphere) at CSU (Colorado State University) and at ATOC 
(department of ATmospheric and OCeanographic sciences) at CU (University 
of Colorado) . In  RAMDAS a fully nonlinear 4DVAR  (4-dimensional 
variational) data assimilation  approach is applied to the cloud 
resolving regional model RAMS (Regional Atmospheric Modeling System) 
that includes  explicit bulk parameterization of cloud processes. The 
observational operator for GOES imager observations is a system for 
computing unpolarized radiative transfer for either collimated solar 
and/or thermal emission sources of radiation in both clear and cloudy 
plane-parallel conditions. Adjoint models of the cloud resolving and 
radiative transfer models include explicit linearization of these 
nonlinear models.  Overall, the results with RAMDAS indicate that the 
data assimilation of the cloud affected geostationary observations is 
feasible. The results show improvement in the model representation of 
the cloudy atmosphere and consistent change in the dynamical cloud 
environment.

*Remote Access*

	

*Video:* 1. Click on JCSDA Seminar 
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*Contact*

	

George Ohring, George.Ohring at noaa.gov <mailto:George.Ohring at noaa.gov>

*Seminar File*

	

Available at  http://www.jcsda.noaa.gov/JCSDASeminars.php the day before 
the talk.

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