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An Ocean Modelling and Assimilation Guide to Using Goce Geoid Products : Volume 7, Issue 1 (23/02/2011)

By Haines, K.

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Book Id: WPLBN0004020499
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: An Ocean Modelling and Assimilation Guide to Using Goce Geoid Products : Volume 7, Issue 1 (23/02/2011)  
Author: Haines, K.
Volume: Vol. 7, Issue 1
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Lea, D., Knudsen, P., Johannessen, J. A., Davidson, F., Bertino, L., Haines, K.,...Hernandez, F. (2011). An Ocean Modelling and Assimilation Guide to Using Goce Geoid Products : Volume 7, Issue 1 (23/02/2011). Retrieved from http://worldlibrary.net/


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
Niiler, P., Maximenko, N. A., and McWilliams, J. C.: Dynamically balanced absolute sea level of the global ocean derived from near-surface velocity observations, Geophys. Res. Lett., 30(22), 2164–2167, 2003.; Oke, P. R., Brassington, G. B., Griffin, D. A., and Schiller, A.: The Bluelink ocean data assimilation system (BODAS), Ocean Model., 21, 46–70, 2008.; Palmer, T. N., Doblas-Reyes, F. J., Hagedorn, R., and Weisheimer, A.: Probabilistic prediction of climate using multi-model ensembles: from basics to applications, Philos. T. R. Soc. B, 360, 1991–1998, doi:10.1098/rstb.2005.1750, 2005.; Rio, M.-H. and Hernandez, F.: A Mean Dynamic Topography computed over The world ocean from altimetry, in-situ measurements and a geoid model, J. Geophys. Res., 109, C12032, doi:10.1029/2003JC002226, 2004.; Rio, M. H., Shaeffer, P., Hernandez, F., and Lemoine, J. M.: The estimation of the ocean Mean Dynamic Topography through the combination of altimetric data, in situ measurements and GRACE geoid: From global to regional studies, in: Proceeding from the GOCINA Workshop, Luxembourg, 2005, Cahiers du Centre European de Geodynamique et de Seismologie, Vol. 25, ISBN-2-9599804-2-5, 171–176, 2005.; Stammer D., Kohl, A., and Wunsch, C.: Impact of Accurate Geoid Fields on Estimates of the Ocean Circulation, J. Atmos. Ocean. Tech., 24, 1464–1478, 2007.; 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.; Benveniste, J., Knudsen, P., and the GUTS Team: 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.; Taylor, K. E.: Summarizing multiple aspects of model performance in a single diagram, J. Geophys. Res., 106(D7), 7183–7192, doi:10.1029/2000JD900719, 2001.; Vianna, M. L. and Menezes, V. V.: Mean mesoscale global ocean currents from geodetic pre-GOCE MDTs with a synthesis of the North Pacific circulation, J. Geophys. Res., 115, C02016, doi:10.1029/2009JC005494, 2010.; Wagner, C. A.: Accuracy Estimates of Geoid and Ocean Topography Recovered Jointly From Satellite Altimetry, J. Geophys. Res., 91(B1), 453–461, 1986.; Vossepoel, F. C.: Uncertainties in the mean ocean dynamic topography before the launch of the Gravity Field and Steady-State Ocean Circulation Explorer (GOCE), J. Geophys. Res., 112, C05010, doi:10.1029/2006JC003891, 2007.; Willis, J. K., Chambers, D. P., and Nerem, R. S.: Assessing the globally averaged sea level budget on seasonal to interannual timescales, J. Geophys. Res., 113, C06015, doi:10.1029/2007JC004517, 2008.; Wunsch, C. and Zlotnicki, V.: The accuracy of altimetric surfaces, Geophys. J. Roy. Astr. S., 78, 795–808, 1984.; Bertino, L. and Lisæter, K. A.: The TOPAZ monitoring and prediction system for the Atlantic and Arctic Oceans, Journal of Operational Oceanography, 1(2), 15–18, 2008.; Bingham, R. J. and Haines, K.: Mean dynamic topography: intercomparison and errors, Philos. T. R. Soc. A, 364, 903–916, 2006.; 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

 

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