Variational assimilation of land surface temperature within the ORCHIDEE Land Surface Model Version 1.2.6
The SECHIBA module of the ORCHIDEE land surface model describes the exchanges of water and energy between the surface and the atmosphere. In the present paper, the adjoint semi-generator software called YAO was used as a framework to implement a 4D-VAR assimilation scheme of observations in SECHIBA....
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2017-01-01
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| Series: | Geoscientific Model Development |
| Online Access: | http://www.geosci-model-dev.net/10/85/2017/gmd-10-85-2017.pdf |
| Summary: | The SECHIBA module of the ORCHIDEE land surface model describes the exchanges
of water and energy between the surface and the atmosphere. In the present
paper, the adjoint semi-generator software called YAO was used as a framework
to implement a 4D-VAR assimilation scheme of observations in SECHIBA. The
objective was to deliver the adjoint model of SECHIBA (SECHIBA-YAO) obtained
with YAO to provide an opportunity for scientists and end users to perform
their own assimilation. SECHIBA-YAO allows the control of the 11 most
influential internal parameters of the soil water content, by observing the
land surface temperature or remote sensing data such as the brightness
temperature. The paper presents the fundamental principles of the 4D-VAR
assimilation, the semi-generator software YAO and a large number of
experiments showing the accuracy of the adjoint code in different conditions
(sites, PFTs, seasons). In addition, a distributed version is available in
the case for which only the land surface temperature is observed. |
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| ISSN: | 1991-959X 1991-9603 |