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Interactions Between the Somali Current Eddies During the Summer Monsoon: Insights from a Numerical Study : Volume 12, Issue 3 (19/05/2015)

By Akuetevi, C. Q. C.

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Book Id: WPLBN0004020898
Format Type: PDF Article :
File Size: Pages 33
Reproduction Date: 2015

Title: Interactions Between the Somali Current Eddies During the Summer Monsoon: Insights from a Numerical Study : Volume 12, Issue 3 (19/05/2015)  
Author: Akuetevi, C. Q. C.
Volume: Vol. 12, Issue 3
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Molines, J., Barnier, B., Verron, J., C. Akuetev, C. Q., & Lecointre, A. (2015). Interactions Between the Somali Current Eddies During the Summer Monsoon: Insights from a Numerical Study : Volume 12, Issue 3 (19/05/2015). Retrieved from http://admin.worldlibrary.net/


Description
Description: Université Grenoble Alpes, LEGI, CNRS, 38000 Grenoble, France. Three hindcast simulations of the global ocean circulation differing by resolution (1/4 or 1/12°) or parameterization or atmospheric forcing are used to study the fast interactions between the large anticyclonic eddies generated by the Somali Current system during the Southwest Monsoon. The present investigation of the Somalian coherent eddy structures allows us to identify the origin and the subsequent development of the cyclones flanked upon the Great Whirl (GW) previously identified by Beal and Donohue (2013) in satellite observations and to establish that similar cyclones are also flanked upon the Southern Gyre (SG). These cyclones are identified as major actors in mixing water masses within the large eddies and offshore the coast of Somali.

All three simulations bring to light that during the period when the Southwest Monsoon is well established, the SG moves northward along the Somali coast and encounter the GW. The interaction between the SG and the GW is a collision without merging, collision during which the GW is pushed to the east of Socotra Island, sheds several smaller patches of anticyclonic vorticity, and often reforms into the Socotra Eddy, thus proposing a formation mechanism for the Socotra Eddy. During this process, the GW gives up its place to the SG which in turn becomes a new Great Whirl. This process is robust throughout the three simulations.


Summary
Interactions between the Somali Current eddies during the summer monsoon: insights from a numerical study

Excerpt
Akuetevi, C. Q. C.: Dynamics of turbulent western boundary currents at low latitude, a numerical study, PhD thesis, Université Joseph-Fourier-Grenoble I, available at: http://lgge.osug.fr/meom/Publications/pdf/these_akuetevi.pdf, 2014.; Akuetevi, C. Q. C. and Wirth, A.: Dynamics of turbulent western boundary currents at low latitude in a shallow water model, Ocean Sci. Discuss., 11, 753–788, doi:10.5194/osd-11-753-2014, 2014.; Barnier, B., Reynaud, T., Beckmann, A., Böning, C., Molines, J.-M., Barnard, S., and Jia, Y.: On the seasonal variability and eddies in the North Brazil Current: insights from model intercomparison experiments, Prog. Oceanogr., 48, 195–230, 2001.; Barnier, B., Madec, G., Pendu , T., Molines, J.-M., Treguier, A.-M., Le Sommer, J., Beckmann, A., Biastoch, A., Böning, C., Dengg, J., Derval, C., Durand, E., Gulev, S., Remy, E., Talandier, C., Theetten, S., Maltrud, M., McClean, J., De Cuevas, B.: Impact of partial steps and momentum advection schemes in a global ocean circulation model at eddy-permitting resolution, Ocean Dynam., 56, 543–567, 2006.; Beal, L. M. and Donohue, K. A.: The Great Whirl: Observations of its seasonal development and interannual variability, J. Geophys. Res.-Oceans, 118, 1–13, 2013.; Beal, L., Hormann, V., Lumpkin, R., and Foltz, G.: The response of the surface circulation of the Arabian Sea to monsoonal forcing, J. Phys. Oceanogr., 43, 2008–2022, 2013.; Brodeau, L., Barnier, B., Treguier, A.-M., Penduff, T., and Gulev, S.: An ERA40-based atmospheric forcing for global ocean circulation models, Ocean Modell., 31, 88–104, 2010.; Dee, D., Uppala, S., Simmons, A., Berrisford, P., Poli, P., Kobayashi, S., Andrae, U., Balmaseda, M., Balsamo, G., Bauer, P., Bechtold, P., Beljaars, A. C. M., van de Berg, L., Bidlot, J., Bormann, N., Delsol, C., Dragani, R., Fuentes, M., Geer, A. J., Haimberger, L., Healy, S. B., Hersbach, H., Holm, E. V., Isaksen, L., Kallberg, P., Köhler, M., Matricardi, M., McNally, A. P., Monge-Sanz, B. M., Morcrette, J.-J., Park, B.-K., Peubey, C., de Rosnay, P., Tavolato, C., Thépaut, J.-N., and Vitart, F.: The ERA-Interim reanalysis: configuration and performance of the data assimilation system, Q. J. Roy. Meteorol. Soc., 137, 553–597, 2011.; Large, W. and Yeager, S.: The global climatology of an interannually varying air–sea flux data set, Clim. Dynam., 33, 341–364, 2009.; Deshayes, J., Tréguier, A.-M., Barnier, B., Lecointre, A., Sommer, J. L., Molines, J.-M., Pendu, T., Bourdallé-Badie, R., Drillet, Y., Garric, G., Benshila, R., Madec, G., Biastoch, A., Böning, C. W., Scheinert, M., Coward, A. C., and Hirschi, J. J.-M.: Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable, Geophys. Res. Lett., 40, 3069–3073, 2013.; DRAKKAR-Group, Barnier, B., Brodeau, L., Le Sommer, J., Molines, J.-M., Penduff, T., Theetten, S., Treguier, A.-M., Madec, G., Biastoch, A., Böning, C., Dengg, J., Gulev, S., Bourdallé-Badie, R., Chanut, J., Garric, G., Alderson, S., Coward, A., de Cuevas, B., New, A. U., Haines, K., Smith, G., Myers, P., Drijfhout, S., Hazeleger, W., and Severijns, C.: Eddy-permitting Ocean Circulation Hindcasts of past decades, Clivar Exchange. Newslett., 12, 8–10, 2007.; DRAKKAR Group, Treguier, A.-M., Barnier, B., Blaker, A., Biastoch, A., Böning, C., Coward, A., Deshayes, J., Duchez, A., Hirschi, J., Le Sommer, J., Madec, G., Maze, G., Molines,J-M., New, A., Penduff, T., Scheinert, M., and Talandier, C.: DRAKKAR: developing high resolution ocean components for European Earth system models, Exchanges, Clivar Newslett., No. 65, 19, 2014.; Duchez, A., Frajka-Williams, E., Castro, N., Hirschi, J., and Coward, A.: Seasonal to interannual variability in density around the Canary Islands and their influence on the Atlantic meridional overturning circulation at 26° N, J. Geophys. Res.-Oce

 

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