World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

Impact of Currents on Surface Flux Computations and Their Feedback on Dynamics at Regional Scales : Volume 11, Issue 4 (31/08/2015)

By Olita, A.

Click here to view

Book Id: WPLBN0004020280
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: Impact of Currents on Surface Flux Computations and Their Feedback on Dynamics at Regional Scales : Volume 11, Issue 4 (31/08/2015)  
Author: Olita, A.
Volume: Vol. 11, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Ribotti, A., Iermano, I., Pessini, F., Fazioli, L., Olita, A., Sorgente, R., & Tedesco, C. (2015). Impact of Currents on Surface Flux Computations and Their Feedback on Dynamics at Regional Scales : Volume 11, Issue 4 (31/08/2015). Retrieved from

Description: Institute for Coastal Marine Environment of the National Research Council, Oristano Section, Torregrande, Italy. A twin numerical experiment was conducted in the seas around the island of Sardinia (Western Mediterranean) to assess the impact, at regional and coastal scales, of the use of relative winds (i.e., taking into account ocean surface currents) in the computation of heat and momentum fluxes through standard (Fairall et al., 2003) bulk formulas. The Regional Ocean Modelling System (ROMS) was implemented at 3 km resolution in order to well resolve mesoscale processes, which are known to have a large influence in the dynamics of the area. Small changes (few percent points) in terms of spatially averaged fluxes correspond to quite large differences of such quantities (about 15 %) in spatial terms and in terms of kinetics (more than 20 %). As a consequence, wind power input P is also reduced by ~ 14 % on average. Quantitative validation with satellite SST suggests that such a modification of the fluxes improves the model solution especially in the western side of the domain, where mesoscale activity (as suggested by eddy kinetic energy) is stronger. Surface currents change both in their stable and fluctuating part. In particular, the path and intensity of the Algerian Current and of the Western Sardinia Current (WSC) are impacted by the modification in fluxes. Both total and eddy kinetic energies of the surface current field are reduced in the experiment where fluxes took into account the surface currents. The main dynamical correction is observed in the SW area, where the different location and strength of the eddies influence the path and intensity of the WSC. Our results suggest that, even at local scales and in temperate regions, it would be preferable to take into account such a contribution in flux computations. The modification of the original code, substantially cost-less in terms of numerical computation, improves the model response in terms of surface fluxes (SST validated) and it also likely improves the dynamics as suggested by qualitative comparison with satellite data.

Impact of currents on surface flux computations and their feedback on dynamics at regional scales

Shchepetkin, A. F. and McWilliams, J. C.: A method for computing horizontal pressure-gradient force in an oceanic model with a nonaligned vertical coordinate, J. Geophys. Res.-Oceans, 108, 3090, doi:10.1029/2001JC001047, 2003.; Shchepetkin, A. F. and McWilliams, J. C.: The regional oceanic modeling system (ROMS): a split-explicit, free-surface, topography-following-coordinate oceanic model, Ocean Model., 9, 347–404, doi:10.1016/j.ocemod.2004.08.002, 2005.; Testor, P. and Gascard, J.-C.: Large-scale spreading of deep waters in the Western Mediterranean Sea by submesoscale coherent eddies, J. Phys. Oceanogr., 33, 75–87, doi:2.0.CO;2>10.1175/1520-0485(2003)033<0075:LSSODW>2.0.CO;2, 2003.; Testor, P., Béranger, K., and Mortier, L.: Modeling the deep eddy field in the southwestern Mediterranean: the life cycle of Sardinian eddies, Gephys. Res. Lett., 32, L13602, doi:10.1029/2004GL022283, 2005.; Tonani, M., Pinardi, N., Fratianni, C., Pistoia, J., Dobricic, S., Pensieri, S., de Alfonso, M., and Nittis, K.: Mediterranean Forecasting System: forecast and analysis assessment through skill scores, Ocean Sci., 5, 649–660, doi:10.5194/os-5-649-2009, 2009.; Vandenbulcke, L., Barth, A., Rixen, M., Alvera-Azcarate, A., Ben Bouallegue, Z., and Beckers, J. M.: Study of the combined effects of data assimilation and grid nesting in ocean models – application to the Gulf of Lions, Ocean Sci., 2, 213–222, doi:10.5194/os-2-213-2006, 2006.; Chapman, D. C.: Numerical treatment of cross-shelf open boundaries in a Barotropic Coastal Ocean Model, J. Phys. Oceanogr., 15, 1060–1075, doi:2.0.CO;2>10.1175/1520-0485(1985)015<1060:NTOCSO>2.0.CO;2, 1985.; Dawe, J. T. and Thompson, L.: Effect of ocean surface currents on wind stress, heat flux, and wind power input to the ocean, Geophys. Res. Lett., 33, L09604, doi:10.1029/2006GL025784, 2006.; Debreu, L. and Blayo, E.: Two-way embedding algorithms: a review, Ocean Dynam., 58, 415–428, doi:10.1007/s10236-008-0150-9, 2008.; Deng, Z., Xie, L., Liu, B., Wu, K., Zhao, D., and Yu, T.: Coupling winds to ocean surface currents over the global ocean, Ocean Model., 29, 261–268, doi:10.1016/j.ocemod.2009.05.003, 2009.; Dinniman, M. S., Klinck, J. M., and Smith, W. O.: Cross-shelf exchange in a model of the Ross Sea circulation and biogeochemistry, Deep-Sea Res. Pt. II, 50, 3103–3120, doi:10.1016/j.dsr2.2003.07.011, 2003.; Warner, J. C., Sherwood, C. R., Arango, H. G., and Signell, R. P.: Performance of four turbulence closure models implemented using a generic length scale method, Ocean Model., 8, 81–113, doi:10.1016/j.ocemod.2003.12.003, 2005.; Wilkin, J. L., Arango, H. G., Haidvogel, D. B., Lichtenwalner, C. S., Glenn, S. M., and HedströM, K. S.: A regional ocean modeling system for the long-term ecosystem observatory, J. Geophys. Res.-Oceans, 110, C06S91, doi:10.1029/2003JC002218, 2005.; Zhai, X. and Greatbatch, R. J.: Wind work in a model of the northwest Atlantic Ocean, Geophys. Res. Lett., 34, L04606, doi:10.1029/2006GL028907, 2007.; Duhaut, T. H. A. and


Click To View

Additional Books

  • On the Shelf Resonances of the Gulf of C... (by )
  • Meridional Transport of Salt in the Glob... (by )
  • Sea Surface Temperature Anomalies, Seaso... (by )
  • Influence of Rossby Waves on Primary Pro... (by )
  • Improving the Parameterisation of Horizo... (by )
  • The Mediterranean Sea System: a Review a... (by )
  • On Contribution of Horizontal and Intra-... (by )
  • Argo Data Assimilation Into Hycom with a... (by )
  • Observations of Water Masses and Circula... (by )
  • Inferring the Zonal Distribution of Meas... (by )
  • On the Modulation of the Periodicity of ... (by )
  • Salinity-induced Mixed and Barrier Layer... (by )
Scroll Left
Scroll Right


Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.