DocumentCode :
484283
Title :
Four-Dimensional Variational Assimilation of Satellite Temperature and Sea Level Data in the Coastal Ocean and Adjacent Deep Sea
Author :
Wilkin, John ; Zavala-Garay, Javier ; Levin, Julia ; Zhang, W. Gordon
Author_Institution :
Inst. of Marine & Coastal Sci., State Univ. of New Jersey, New Brunswick, NJ
Volume :
3
fYear :
2008
fDate :
7-11 July 2008
Abstract :
Incremental, Strong constraint, 4-dimensional variational data assimilation is used to initialize operational forecast models of mesoscale ocean circulation in continental shelf and associated boundary current regimes. In the East Australia Current and the Mid-Atlantic Bight, data assimilation in the deep ocean adjacent to the shelf imposes the influence of remote-ocean forcing on coastal dynamics. Observations assimilated are satellite surface temperature (SST), satellite altimeter sea level anomalies (SLA), and subsurface temperature and salinity from ships, autonomous underwater vehicles and/or profiling floats. The models use boundary data from operational basin-scale circulation models and weather forecast meteorological forcing. Control variables of the data assimilation are the initial conditions of each assimilation window, and the model trajectory through each interval is deemed the best-estimate analysis for initializing the subsequent forecast. We evaluate model skill from a large set of multi-day forecasts starting from different initial mesoscale states. Forecast skill is enhanced, and uncertainty reduced, when empirical statistical subsurface pseudo-observations and/or so-called balance constraints are used to augment surface satellite data.
Keywords :
data assimilation; height measurement; ocean temperature; oceanographic regions; remote sensing; sea level; underwater vehicles; 4-dimensional variational data assimilation; Control variables; East Australia Current; Mid-Atlantic Bight; autonomous underwater vehicles; boundary current; coastal dynamics; coastal ocean; continental shelf; deep sea; mesoscale ocean circulation; operational basin-scale circulation models; operational forecast models; profiling floats; satellite altimeter; satellite surface temperature; satellite temperature data; sea level anomalies; ships; statistical subsurface pseudo-observations; subsurface salinity; underwater vehicles; weather forecast meteorological forcing; Australia; Data assimilation; Ocean temperature; Predictive models; Satellites; Sea level; Sea measurements; Sea surface; Vehicle dynamics; Weather forecasting; Hydrodynamics; coastal oceanography; data assimilation; remote sensing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2008. IGARSS 2008. IEEE International
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-2807-6
Electronic_ISBN :
978-1-4244-2808-3
Type :
conf
DOI :
10.1109/IGARSS.2008.4779375
Filename :
4779375
Link To Document :
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