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Using Adjoint Sensitivity as a Local Structure Function in Variational Data Assimilation : Volume 8, Issue 6 (30/11/-0001)

By Hello, G.

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Book Id: WPLBN0004019990
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: Using Adjoint Sensitivity as a Local Structure Function in Variational Data Assimilation : Volume 8, Issue 6 (30/11/-0001)  
Author: Hello, G.
Volume: Vol. 8, Issue 6
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
-0001
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Hello, G., & Bouttier, F. (-0001). Using Adjoint Sensitivity as a Local Structure Function in Variational Data Assimilation : Volume 8, Issue 6 (30/11/-0001). Retrieved from http://hawaiilibrary.net/


Description
Description: Centre National de Recherche de la Météorologie, Météo-France, Toulouse, France. One approach recently proposed in order to improve the forecast of weather events, such as cyclogenesis, is to increase the number of observations in areas depending on the flow configuration. These areas are obtained using, for example, the sensitivity to initial conditions of a selected predicted cyclone. An alternative or complementary way is proposed here. The idea is to employ such an adjoint sensitivity field as a local structure function within variational data assimilation, 3D-Var in this instance. Away from the sensitive area, observation increments project on the initial fields with the usual climatological (or weakly flow-dependent, in the case of 4D-Var) structure functions. Within the sensitive area, the gradient fields are projected using all the available data in the zone, conventional or extra, if any. The formulation of the technique is given and the approach is further explained by using a simple 1D scheme. The technique is implemented in the ARPEGE/IFS code and applied to 11 FASTEX (Fronts and Atlantic Storm-Track Experiment) cyclone cases, together with the targeted observations performed at the time of the campaign. The new approach is shown to allow for the desired stronger impact of the available observations and to systematically improve the forecasts of the FASTEX cyclones, unlike the standard 3D-Var.

Summary
Using adjoint sensitivity as a local structure function in variational data assimilation

 

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