[Proflist] Joint Center for Satellite Data Assimilation Seminar, October 20th: Stephen English

[Ana Carrion - NOAA Affiliate]

*JCSDA Seminar*

*Title*

*Satellite Data Assimilation at ECMWF*

*Speaker*

*Stephen English*

*European Center for Medium-Range Weather Forecasting (ECMWF)*

*Date,  Time & Place*

*October 20, 2014, 11:00am – 12:00pm*
Conference Center, NOAA Center for Weather and Climate Prediction, 5830
University Research Court, College Park, MD

*Abstract*

ECMWF assimilates observations from over 50 satellite instruments, and
monitors many more in the operational system. Recently the main focus has
been in three broad areas:
1) Full (or at least more complete) utilization of hyperspectral sounder
data; 2) Moving more moisture sensitive observations into the so called
"all-sky" assimilation framework, where we explicitly model the impact of
cloud and precipitation on the observations, and allow these observations
to influence the analysis; 3) An increasingly sophisticated treatment of
observation errors, notably for Atmospheric Motion Vectors (AMVs), and
observation error correlations for radiances.



In the first area, ECMWF has been able to demonstrate that for cloud-free
scenes assimilation of IASI observations as radiances or Principal
Components (PCs) can give the same impact, and a better impact when more of
the spectrum is assimilated affordably through the PCs. Indeed, this
advantage is sufficient that the assimilation of cloud-free PCs is, in
general, equal to and often better than the assimilation of radiances in
clear and overcast scenes, and for channels peaking above cloud. In the
second area, ECMWF has been assimilating microwave imager data for many
years through the all-sky route, but now humidity sounders are also being
moved to the all-sky framework, with noticeable positive impact, especially
on vector wind forecast scores. In the third area, the impact of AMVs has
notably increased through the use of scene dependent errors, and
experiments are showing not only can we cope with observation error
correlation, we may even be able to exploit it in a positive way in some
situations. In addition, the seminar will briefly discuss the status of
Radio Occultation assimilation, progress with data from the Feng Yun
satellites, new observation impact diagnostics, and a perspective on
current and future directions for data assimilation in general at ECMWF.

*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. No password is necessary 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 Erin.Jones at noaa.gov

*Seminar Files*

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

-- 

*Ana Carrion*
National Oceanic and Atmospheric Administration
Program Support Specialist
Riverside (RTi) at NOAA/NESDIS/STAR/JCSDA
NCWCP, E/RA, Room #2652
5830 University Research CT
College Park, MD 20740-3818

Email: Ana.Carrion at noaa.gov
*Main Line**: 301-683-3520*
*JCSDA Front Office: 301-683-3615*
*STAR Front Office: 301-683-3485 *
Fax: 301-683-3526
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