Development of NAVDAS-AR: formulation and initial tests of the linear problem

Liang Xu; Tom Rosmond; Roger Daley

doi:10.3402/tellusa.v57i4.14710

Development of NAVDAS-AR: formulation and initial tests of the linear problem

Tellus

Volume 57 (2005): Issue 4

By: Liang Xu, Tom Rosmond and Roger Daley

Open Access

|Jan 2005

Abstract

A 4-D implementation of an observation space variational data assimilation system is under development at the Marine Meteorology Division of the Naval Research Laboratory (NRL). The system is an extension of the current US Navy 3-D operational data assimilation system, the NRL Atmospheric Variational Data Assimilation System (NAVDAS). The new system, NAVDAS-AR, where AR stands for accelerated representer, is similar in many respects to the European Centre for Medium-Range Weather Forecasts (ECMWF) 4DVAR system. However, NAVDAS-AR is based on a weak constraint observation space, while the ECMWF system is based on a strong constraint model space. In this paper the formulation of NAVDAS-AR is described in detail and preliminary results with a perfect model assumption and comparisons with the operational NAVDAS are presented.

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Articles in this issue

DOI: https://doi.org/10.3402/tellusa.v57i4.14710 | Journal eISSN: 3035-9554

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Language: English

Page range: 546 - 559

Submitted on: Jul 20, 2004

Accepted on: Dec 10, 2004

Published on: Jan 1, 2005

Published by: Stockholm University Press

In partnership with: Paradigm Publishing Services

© 2005 Liang Xu, Tom Rosmond, Roger Daley, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 57 (2005): Issue 4