[Todos] COLOQUIO:"Advanced data assimilation techniques and model error"

[coloquios]

**********************************************************************

Coloquio del Departamento de Ciencias de la Atmósfera y los Océanos
(DCAO)/
Centro de Investigaciones del Mar y la Atmósfera (CIMA)

**********************************************************************
 
Viernes 2 de Diciembre, 13hs, 2º Piso, DCAO, AULA 8
 
COLOQUIO
"Advanced data assimilation techniques and model error"

Alberto Carrassi
Department of Dynamical Meteorology and Climatology
Royal Meteorological Institute of Belgium – RMI

Alberto Carrassi trabaja en asimilación de datos a modelos estadísticos.
Tiene una amplia trayectoria en el tema, que le han valido distinciones
como la Beca Marie Curie y la High Power Computer Mobility fellow en
Europa. El Dr. Carrassi realizó sus estudios de Doctorado en la
Universidad de Ferrara, Italia y actualmente trabaja en el Instituto Real
de Bélgica.


Resumen:

Data assimilation is confronted with the presence of model errors
arising from the imperfect description of atmospheric and oceanic
dynamics. Due to the lack of a unique framework for the model error
treatment and to the difficulty to accumulate reliable statistics, these
errors are often ignored or modeled on the basis of simple assumptions.

By using a deterministic formulation, an approach to account for the
model error in data assimilation is proposed. This deterministic
framework has been the guideline for model error treatment in sequential
and variational schemes.

In this presentation we discuss first the deterministic description of
the model error evolution incorporated into the classical extended
Kalman filter. An alternative formulation of the EKF for state and
parameter estimation, referred to as Short-Time Augmented Extended
Kalman Filter (ST-AEKF), is then introduced.

The extension to variational schemes is presented in the sequel. 
The state estimation problem requires here the model error time
correlations. 
A straightforward way to estimate these correlations using the
deterministic approach is proposed and is incorporated in the
weak-constraint variational assimilation.
  

Lugar: AULA 8, DCAO, 2º Piso
Pabellón 2,
Ciudad Universitaria.

Los esperamos a todos!

***********************************************************************
Grupo Coloquios
Departamento de Ciencias de la Atmosfera y los Oceanos (FCEN-UBA)
Centro de Investigaciones del Mar y la Atmosfera (CONICET-UBA)
Ciudad Universitaria, 2do piso.
email: coloquios en at.fcen.uba.ar
http://www.at.fcen.uba.ar/charlas_not.php
http://www.cima.fcen.uba.ar/espanol/index.htm
**********************************************************************