[Proflist] Joint Center for Satellite Data Assimilation Seminar, April 19: Isaksen

[George Ohring - NOAA Affiliate]

* *

*JCSDA Seminar*

*Title*

*Data Assimilation Progress and Plans at ECMWF***

*Speaker*

*Lars Isaksen
European Center for Medium-range Weather Forecasting *

*Date,  Time & Place*

*Friday, April 19, 2013**
*2:00 – 3:00 PM
Conference Center, NOAA Center for Weather and Climate Prediction, 5830
University Research Court, College Park, MD

*Abstract*

The operational 4-Dimensional Variational (4DVAR) data assimilation system
at the European Centre for Medium-range Weather Forecasts (ECMWF) has
recently been extended to a hybrid system, where flow-dependent background
error variances are provided by an Ensemble of 4DVAR Data Assimilations
(EDA). The EDA has also been used to compute new climatological background
error covariances. With the next upgrade, in June 2013, the EDA will be
extended from 10 to 25 members and used for on-line estimation of wavelet
based background error covariances. All these background error related
upgrades result in significant analysis and forecast improvements. The
following operational upgrade, planned for the end of 2013, will extend the
4DVAR analysis window from 12 hours to 24 hours, run twice daily. The
analysis resolution will also be increased.  The seminar will present
results of these recent upgrades and discuss the related challenges, like
the accuracy of tangent-linear approximation and scalability of 4DVAR. The
seminar will also cover recent progress in land surface analysis. A new
soil moisture analysis and new snow analysis have been implemented
recently. Work is on-going to assimilate ASCAT and SMOS soil moisture
satellite data, in addition to comprehensive hydrological validation
activities. Other important activities like refactoring of software,
improved handling of large volumes of observations, advanced diagnostics
and improved observation error characterization will be covered briefly.

*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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