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| Titel |
The 1/12 degree Global HYCOM Nowcast/Forecast System |
| VerfasserIn |
O. M. Smedstad, J. A. Cummings, E. J. Metzger, H. E. Hurlburt, A. J. Wallcraft, D. S. Franklin, J. F. Shriver, P. G. Thoppil |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250033917
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| Zusammenfassung |
| The 1/12 degree global HYbrid Coordinate Ocean Model (HYCOM) has been
running daily since 22 December 2006. With ~7 km mid-latitude resolution
(3-4 km near the poles), the system depicts the location of mesoscale
features such as oceanic eddies and fronts and provides the three
dimensional ocean temperature, salinity and current structure. An efficient
assimilation scheme is necessary in order to run within the time constraints
of an operational center. The Navy Coupled Ocean Data Assimilation (NCODA)
system is used to assimilate available observations. An important component
of the NCODA system is the quality control of the observations. NCODA uses
a multivariate optimal interpolation scheme (MVOI) that assimilates surface
observations from satellite altimeter tracks and available SST data. A 3
dimensional variational analysis scheme is in the process of being implemented
as a replacement for MVOI. NCODA also assimilates in situ observations, including
profile data from BT's and Argo floats. The daily run consists of a 5-day hindcast
with an NCODA analysis each day and then a 5-day forecast. Over the last
couple of years a series of validation tasks have been performed to evaluate
the HYCOM/NCODA system. Independent observations are used whenever possible
in the evaluation of assimilation system performance. A subset of these
evaluations will be presented. The prediction system provides boundary
conditions for higher resolution nested models. An accurate representation of
the oceanographic fields at the open boundaries of a model is important for a
successful ocean prediction system. Results from the global system can be viewed
on the HYCOM web page http://www.hycom.org. The hindcast and the real time
model output can also be accessed through this web page. |
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