[Proflist] Joint Center for Satellite Data Assimilation Seminar, August 27: Hans Ngodock

[Ana Carrion - NOAA Affiliate]

* *

*JCSDA Seminar*

*Title*

*Navy Coastal Ocean Model (NCOM) Four Dimensional Variational (4D-Var) Data
Assimilation System:  Initial Experiments in the Monterey Bay, Hawaiian,
and Gulf of Mexico Regions*

*Speaker*

*Hans Ngodock *

Naval Research Lab

*Date,  Time & Place*

*Tuesday, August 27, 2013 2:00-3:00 PM*
Auditorium, NOAA Center for Weather and Climate Prediction, 5830 University
Research Court, College Park, MD

*Abstract*

A 4DVAR data assimilation system has recently been developed for the NCOM
and has been demonstrated using real ocean observations in this study.  The
NCOM-4DVAR is formulated for weak-constraint data assimilation based on the
in-direct representer method.  In this study, satellite data consisting of
sea surface temperatures (SSTs) as well as in-situ data from Airborne
eXpendable BathyThermographs (AXBTs), ARGO floats, and gliders is used to
derive optimal corrections to the ocean model background and surface
forcing provided by the atmospheric model.  Three regional domains have
been selected for this study:  the first consists of the waters adjacent to
Monterey Bay, California during the AOSN-II experiment; the second in a
region surrounding Hawaii during the RIMPAC08 experiment; and a third
region consisting of the Gulf of Mexico during the Grand Lagrangian
Deployment (GLAD) surface drifter experiment.  This Gulf of Mexico domain
includes traditional observations as well as surface ocean velocity
measurements derived from drifter position data.  It is shown that the
NCOM-4DVAR can correct the model solution via control of the initial
conditions and model error terms and produce an improved forecast as a
result.  Also the NCOM-4DVAR can produce optimal corrections to the
atmospheric forcing based on ocean data.  These corrections alone can be
applied to the specified surface forcing to produce an improved ocean
forecast.

*Remote Access***

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*Contact*

If you would like to present a seminar contact Kevin.Garrett 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 #2600
5830 University Research CT
College Park, MD 20740-3818

Email: Ana.Carrion at noaa.gov
*JCSDA Main: 301-683-3615*
*Direct: 301-683-3520*
Fax: 301-683-3526
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