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An Ocean Modelling and Assimilation Guide to Using Goce Geoid Products : Volume 7, Issue 6 (05/11/2010)

By Haines, K.

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Book Id: WPLBN0003985695
Format Type: PDF Article :
File Size: Pages 39
Reproduction Date: 2015

Title: An Ocean Modelling and Assimilation Guide to Using Goce Geoid Products : Volume 7, Issue 6 (05/11/2010)  
Author: Haines, K.
Volume: Vol. 7, Issue 6
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Knudsen, P., Lea, D., Johannesson, J., Haines, K., & Rio, M. (2010). An Ocean Modelling and Assimilation Guide to Using Goce Geoid Products : Volume 7, Issue 6 (05/11/2010). Retrieved from http://www.ebooklibrary.org/


Description
Description: Environmental Systems Science Centre, Harry Pitt Bld, 3 Earley Gate, Reading University, Reading RG6 6AL, UK. We review the procedures and challenges that must be considered when using geoid data derived from the Gravity and steady-state Ocean Circulation Explorer (GOCE) mission in order to constrain the circulation and water mass representation in an ocean general circulation model. It covers the combination of the geoid information with time-mean sea level information derived from satellite altimeter data, to construct a mean dynamic topography (MDT), and considers how this complements the time-varying sea level anomaly, also available from the satellite altimeter. We particularly consider the compatibility of these different fields in their spatial scale content, their temporal representation, and in their error covariances. These considerations are very important when the resulting data are to be used to estimate ocean circulation and its corresponding errors.

We describe the further steps needed for assimilating the resulting dynamic topography information into an ocean circulation model using three different operational forecasting and data assimilation systems. We look at methods used for assimilating altimeter anomaly data in the absence of a suitable geoid, and then discuss different approaches which have been tried for assimilating the additional geoid information. We review the problems that have been encountered and the lessons learned in order the help future users. Finally we present some results from the use of GRACE geoid information in the operational oceanography community and discuss the future potential gains that may be obtained from a new GOCE geoid.


Summary
An ocean modelling and assimilation guide to using GOCE geoid products

Excerpt
Bahurel, P., Adragna, F., Bell, M., Jacq, F., Johannessen, J. A., Le Traon, P.-Y., Pinardi, N., and She, J.: MyOCEAN-A European example of a Post-GODAE initiative, available at: http://www.godae.org/modules/documents/documents/Proceedings-GFS-2008.pdf, 2009.; Bingham, R. J. and Haines, K.: Mean dynamic topography: intercomparison and errors, Philos. T. Roy. Soc. A, 364, 903–916, 2006.; Benveniste, J., Knudsen, P. and the GUTS Team, 2007: The GOCE User Toolbox, in: Proceedings of the 3rd International GOCE User Workshop, 6–8 November 2006, Frascati, Italy, edited by: Fletcher, K., Noordwijk, European Space Agency, 2007.; Bingham, R. J., Haines, K., and Hughes, C .W.: Calculating the Ocean's Mean dynamic topography from a Mean sea surface and a Geoid, J. Atmos. Ocean. Tech., 25, 1808–1822, doi:10.1175/2008JTECHO568.1, 2008.; Bingham, R. J., Knudsen, P., Andersen, O., and Pail, R.: An initial estimate of the North Atlantic steady-state geostrophic circulation from GOCE, Geophys. Res. Lett., in press, 2010.; Carrère, L. and Lyard, F.: Modelling the barotropic response of the global ocean to atmospheric wind and pressure forcing – comparisons with observations, Geophys. Res. Lett., 30(6), 1275, doi:10.1029/2002GL016473, 2003.; Cooper, M. C. and Haines, K.: Data assimilation with water property conservation, J. Geophys. Res, 101(C1), 1059–1077, 1996.; Hughes, C. W. and Bingham, R. J.: An oceanographer's guide to GOCE and the geoid, Ocean Sci., 4(1), 15–29, 2008.; De Mey, P. and Benkiran, M.: A multivariate reduced-order optimal interpolation method and its application to the Mediterranean basin-scale circulation, in: Ocean Forecasting, Conceptual basis and applications, edited by: Pinardi, N. and Woods, J. D., Springer-Verlag, Berlin Heidelberg New York, 472 pp., 2002.; Denker, D. and Rapp, R. H.: Geodetic and Oceanographic Results from the Analysis of One Year of Geosat Data, J. Geophys. Res., 95(C8), 13151–13168, 1990.; Dobricic, S.: New mean dynamic topography of the Mediterranean calculated from assimilation system diagnostics, Geophys. Res. Lett., 32, L11606, doi:10.1029/2005GL022518, 2005.; Drecourt, J.-P., Haines, K., and Martin, M. J.: Influence of systematic error correction on the temporal behaviour of an ocean model, J. Geophys. Res., 111, C11020, doi:10.1029/2006JC003513, 2006.; Engelis, T. and Knudsen, P.: Orbit Improvement and Determination of the Oceanic Geoid and Topography from 17 Days of Seasat Data, Manuscr. Geodaet., 14(3), 193–201, 1989.; Fox, A. D. and Haines, K.: Interpretation of Water transformations diagnosed from data assimilation, J. Phys. Oceanogr., 33, 485–498, 2003.; Greiner, E. and Arnault, S.: Comparing the results of a 4D-variational assimilation of satellite and in situ data with WOCE CITHER hydrographic measurements in the tropical Atlantic Progress, Oceanography, 47(1), 1–68, doi:10.1016/S0079-6611(00)00031-8, 2000.; Hansen, B. and Østerhus, S.: North Atlantic Nordic Seas exchanges, Prog. Oceanogr., 45, 109–208, 2000.; Hansen, B., Osterhus, S., Turrell, W. R., Jonsson, S., Valdimarsson, H., Hatun, H., and Olsen, S. M.: The Inflow of Atlantic Water, Heat, and Salt to the Nordic Seas Across the Greenland-Scotland Ridge, in: Arctic-Subarctic Ocean Fluxes: Defining the Role of the Northern Seas in Climate, edited by: Dickson, R. R., Meincke, J., and Rhines, P., Springer Science + Business Media B. V., 15–43, 2008.; Hernandez, F. and Schaeffer, P.: Altimetric mean sea surfaces and gravity anomaly maps inter-comparisons, Rep. AVI-NT-011-5242-CLS, 48 pp., Collect. Location de Satell., Ramonville St Agne, France, 2000.; Hipkin, R. and Hunegnaw, A.: Mean dynamic topography by an iterative combination method, in: Cahiers du Centre Européen de Géodynamique et de Séismologie, Proceeding from the GOCINA Workshop, Luxembourg, 2005, Cahiers du Centre European de Geodynamique et de Seismologie, Vol. 25, ISBN&n

 

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