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Evaluating Two Numerical Advection Schemes in Hycom for Eddy-resolving Modelling of the Agulhas Current : Volume 5, Issue 2 (02/06/2009)

By Backeberg, B. C.

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Book Id: WPLBN0004020377
Format Type: PDF Article :
File Size: Pages 18
Reproduction Date: 2015

Title: Evaluating Two Numerical Advection Schemes in Hycom for Eddy-resolving Modelling of the Agulhas Current : Volume 5, Issue 2 (02/06/2009)  
Author: Backeberg, B. C.
Volume: Vol. 5, Issue 2
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Johannessen, J. A., Bertino, L., & Backeberg, B. C. (2009). Evaluating Two Numerical Advection Schemes in Hycom for Eddy-resolving Modelling of the Agulhas Current : Volume 5, Issue 2 (02/06/2009). Retrieved from http://www.worldlibrary.net/


Description
Description: Department of Oceanography, University of Cape Town, South Africa. A 4th order advection scheme is applied in a nested eddy-resolving Hybrid Coordinate Ocean Model (HYCOM) of the greater Agulhas Current system for the purpose of testing advanced numerics as a means for improving the model simulation for eventual operational implementation. Model validation techniques comparing sea surface height variations, sea level skewness and variogram analyses to satellite altimetry measurements quantify that generally the 4th order advection scheme improves the realism of the model simulation. The most striking improvement over the standard 2nd order momentum advection scheme, is that the southern Agulhas Current is simulated as a well-defined meandering current, rather than a train of successive eddies. A better vertical structure and stronger poleward transports in the Agulhas Current core contribute toward a better southwestward penetration of the current, and its temperature field, implying a stronger Indo-Atlantic inter-ocean exchange. It is found that the transport, and hence this exchange, is sensitive to the occurrences of mesoscale features originating upstream in the Mozambique Channel and southern East Madagascar Current, and that the improved HYCOM simulation is well suited for further studies of these inter-actions.

Summary
Evaluating two numerical advection schemes in HYCOM for eddy-resolving modelling of the Agulhas Current

Excerpt
Backeberg, B. C., Johannessen, J. A., Bertino, L., and Reason, C. J.: The greater Agulhas Current system: An integrated study of its mesoscale variability, Journal of Operational Oceanography, 1(1), 29–44, 2008.; Barnier, B., Madec, M., Pendruff, T., Molines, J.-M., Treguier, A.-M., Sommer, J. L., Beckmann, A., Biastoch, A., Bnning, C., Dengg, J., Derval, C., Durand, E., Gulev, S., Remy, E., Talandier, C., Theetten, S., Maltrud, M., McClean, J., and DeCuevas, B.: Impact of partial steps and momentum advection schemes in a global ocean circulation model at eddy permitting resolution, Ocean Dynam., 56(5–6), 543–567, 2006.; Bentsen, M., Evensen, G., Drange, H., and Jenkins, A. D.: Coordinate transformation on a sphere using conformal mapping, Mon. Weather Rev., 127, 2733–2740, 1999.; Biastoch, A. and Krauss, W.: The role of mesoscale eddies in the source regions of the Agulhas Current, J. Phys. Oceanogr., 29, 2303–2317, 1999.; Bleck, R.: An oceanic general circulation model framed in hybrid isopycnic-Cartesian coordinates, Ocean Model., 37, 55–88, 2002.; Bleck, R.: On the use of hybrid vertical coordinates in ocean circulation modeling, in: Ocean Weather Forecasting, edited by: Chassignet, E. P. and Verron, J., Springer, Netherlands, 109–126, 2006.; Gr{ü}ndlingh, M. L.: On the course of the Agulhas Current, S. Afr. Geograph. J., 65, 49–57, 1983.; Bleck, R. and Smith, L.: A wind-driven isopycnic coordinate model of the North Atlantic and Equatorial Atlantic Ocean. 1: Model development and supporting experiments, J. Geophys. Res., 95, 3273–3285, 1990.; Boebel, O., Rossby, T., Lutjeharms, J. R. E., Zenk, W., and Barron, C.: Path and variability of the Agulhas Return Current, Deep-Sea Res. (II Top. Stud. Oceanogr.), 50, 35–56, 2003.; Leonard, B. P.: A stable and accurate convective modelling procedure based on quadratic upstream interpolation, Comp. Methods Appl. Mech. Eng., 19, 59–98, 1979.; Browning, G. L. and Kreiss, H. O.: Initialization of the shallow water equations with open boundaries by the bounded derivative method, Tellus, 34, 334–351, 1982.; Browning, G. L. and Kreiss, H. O.: Scaling and computation of smooth atmospheric motions, Tellus A, 38, 295–313, 1986.; Bryden, H. L., Beal, L. M., and Duncan, L. M.: Structure and Transport of the Agulhas Current and Its Temporal Variability, J. Oceanogr., 61, 479–492, 2005.; Bryden et al.\blackboxplease name at least two more authors: Agulhas Current Experiment, Cruise Report No. 249, Institute of Oceanographic Sciences, Wormley, 85 pp., 1995.; Davies, H. C.: Limitations of some common lateral boundary schemes used in NWP models, Mon. Weather Rev., 111, 1002–1012, 1983.; de Ruijter, W. P. M., Ridderinkhof, H., Lutjeharms, J. R. E., Schouten, M. W., and Veth, C.: Observations of the flow in the Mozambique Channel, Geophys. Res. Lett., 29(10), 1502–1504, 2002.; de Ruijter, W. P. M., van Leeuwen, P. J., and Lutjeharms, J. R. E.: Generation and Evolution of Natal Pulses: Solitary Meanders in the Agulhas Current, J. Phys. Oceanogr., 29, 3043–3055, 1999.; Gneiting, T., Sasvári, Z., and Schlather, M.: Analogies and correspondences between variograms and covariance functions, Adv. Appl. Prob., 33, 617–630, 2001.; Le Traon, P.-Y.: Satellite oceanography for ocean forecasting, in: Ocean Forecasting, edited by: Pinardi, N. and Woods, J. D., Springer, New York, USA, 19–36, 2002.; Legates, D. and Willmott, C.: Mean seasonal and spatial variability in gauge-corrected, global precipitation, J. Clim., 10, 111–127, 1990.; Lutjeharms, J. R. E. and Roberts, H. R.: The Natal Pulse: An extreme transient on the Agulhas Current, J. Geophys. Res., 93, 631–645, 1988.; Lutjeharms, J. R. E. and Valentine, H. R.: Southern Ocean thermal fronts south of Africa, Deep-Sea Res., 31(12), 1461–1475, 1984.; Lutjeharms, J. R. E. and van Ballegooyen, R. C.: The retroflection of the Agulhas Current, J. Phys. Oceanogr., 18, 1570–1583, 1988.; Matano, R. P. and Beier, E. J.: A kinemati

 

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