Assimilation of SLA and SST data into an OGCM for the Indian Ocean |
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| Authors: | Vibeke E J Haugen Geir Evensen |
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| Institution: | (1) Nansen Environmental and Remote Sensing Center, Edvard Griegsvei 3a, 5059 Solheimsviken, Norway E-mails: vihaug@statoil.com, Geir.Evensen@netrsc.no, NO |
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| Abstract: | Remotely sensed observations of sea-level anomaly and sea-surface temperature have been assimilated into an implementation
of the Miami Isopycnic Coordinate Ocean Model (MICOM) for the Indian Ocean using the Ensemble Kalman Filter (EnKF). The system
has been applied in a hindcast validation experiment to examine the properties of the assimilation scheme when used with a
full ocean general circulation model and real observations. This work is considered as a first step towards an operational
ocean monitoring and forecasting system for the Indian Ocean. The assimilation of real data has demonstrated that the sequential
EnKF can efficiently control the model evolution in time. The use of data assimilation requires a significant amount of additional
processing and computational resources. However, we have tried to justify the cost of using a sophisticated assimilation scheme
by demonstrating strong regional and temporal dependencies of the covariance statistics, which include highly anisotropic
and flow-dependent correlation functions. In particular, we observed a marked difference between error statistics in the equatorial
region and at off-equatorial latitudes. We have also demonstrated how the assimilation of SLA and SST improves the model fields
with respect to real observations. Independent in situ temperature profiles have been used to examine the impact of assimilating
the remotely sensed observations. These intercomparisons have shown that the model temperature and salinity fields better
resemble in situ observations in the assimilation experiment than in a model free-run case. On the other hand, it is also
expected that assimilation of in situ profiles is needed to properly control the deep ocean circulation.
Received: 8 January 2002 / Accepted: 8 April 2002 |
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| Keywords: | Assimilation of SLA and SST EnKF Indian Ocean |
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