[Proflist] Today, 2 PM, Joint Center for Satellite Data Assimilation Seminar: Jesse Meng

[George Ohring - NOAA Affiliate]

* *

*JCSDA Seminar*

*Title*

*Improvement of Global Forecast System (GFS) Land Surface Skin Temperature
and Its Impact on Satellite Data Assimilation***

*Speaker*

*Jesse Meng
NOAA National Centers for Environmental Prediction *

*Date,  Time & Place*

*Friday, March 15, 2013**
*2:00 – 3:00 PM
Conference Center, NOAA Center for Weather and Climate Prediction, 5830
University Research Court, College Park, MD

*Abstract*

Comparison of the land surface skin temperature (LST) from the National
Centers for Environmental Prediction (NCEP) operational Global Forecast
System (GFS) against satellite and in situ data in summer 2007 indicates
that the GFS has a large and cold bias in LST over the arid western
continental United States (CONUS) during daytime. This LST bias contributes
to large errors in simulated satellite brightness temperatures over land by
the Community Radiative Transfer Model (CRTM) and hence the rejection of
satellite data in the NCEP Gridpoint Statistical Interpolation (GSI)
system, especially for surface-sensitive satellite channels. The new
vegetation-dependent formulations of momentum and thermal roughness lengths
are tested in the GFS. They substantially reduce the large cold bias of
daytime LST over the arid western CONUS in the warm season. This, in turn,
significantly reduces the large biases of calculated satellite brightness
temperatures found for infrared and microwave sensors in window or
near-window channels, so that many more satellite data can be assimilated
in the GSI system. In the arid western CONUS, the calculation of surface
emissivity for microwave sensors in the CRTM can be further improved, and
the new microwave land emissivity model together with increased LST via
changes in surface roughness length formulations reduces biases and
root-mean-square errors in the calculated brightness temperature.

*Remote Access*

*Video:* 1. Go to JCSDA Seminar <https://star-nesdis-noaa.webex.com/> and
click on the seminar title
2. Enter your name and email address.
3. Enter the meeting password: JCSDAseminars707
4. Click "Join Now".
5. Follow the instructions that appear on your screen.
*Audio: *USA participants: 1-866-715-2479,  Passcode: 9457557
International:                    1-517-345-5260

*Contact*

If you would like to present a seminar contact George.Ohring at noaa.gov

*Seminar File*

Slides available prior to, and audio recording after, the presentation at
http://www.jcsda.noaa.gov/JCSDASeminars.php
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