World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

Observing and Modeling Currents on the Continental Slope: Assimilation of High Frequency Radar Currents and Hydrography Profiles : Volume 11, Issue 3 (04/06/2014)

By Sperrevik, A. K.

Click here to view

Book Id: WPLBN0004020780
Format Type: PDF Article :
File Size: Pages 34
Reproduction Date: 2015

Title: Observing and Modeling Currents on the Continental Slope: Assimilation of High Frequency Radar Currents and Hydrography Profiles : Volume 11, Issue 3 (04/06/2014)  
Author: Sperrevik, A. K.
Volume: Vol. 11, Issue 3
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

Christensen, K. H., Röhrs, J., & Sperrevik, A. K. (2014). Observing and Modeling Currents on the Continental Slope: Assimilation of High Frequency Radar Currents and Hydrography Profiles : Volume 11, Issue 3 (04/06/2014). Retrieved from

Description: Norwegian Meteorological Institute, Oslo, Norway. Assimilation of High Frequency (HF) radar current observations and CTD hydrography is performed with the 4D-Var analysis scheme implemented in the Regional Ocean Modeling System (ROMS). We consider both an idealized case, with a baroclinic slope current in a periodic channel, and a realistic case for the coast of Vesterålen in Northern Norway. In the realistic case the results of the data assimilation are compared with independent data from acoustic profilers and surface drifters. Best results are obtained when background error correlation scales are small (10 km or less) and when the data assimilation window is short, i.e. about one day. Furthermore, we find that the impact of assimilating HF radar currents is generally larger than the impact of CTD hydrography, which implies that the amount of hydrographic data is insufficient to constrain the solution. Combining the HF radar currents with a few hydrographic profiles gives significantly better results, which demonstrates the importance of complementing surface observations with observations of the vertical structure of the ocean.

Observing and modeling currents on the continental slope: assimilation of high frequency radar currents and hydrography profiles

Albretsen, J., Sperrevik, A. K., Staalstrøm, A., Sandvik, A. D., Vikebø, F., and Asplin, L.: NorKyst-800 report no. 1: User manual and technical descriptions, Tech. Rep. 2, Institute of Marine Researh, Bergen, Norway, available at: (last access: 2 June 2014), 2011.; Barrick, D. E., Evans, M. W., and Weber, B. L.: Ocean Surface Currents Mapped by Radar, Science, 198, 138–144, 1977.; Barth, A., Alvera-Azcárate, A., and Weisberg, R. H.: Assimilation of high-frequency radar currents in a nested model of the West Florida Shelf, J. Geophys. Res.-Oceans, 113, C08033, doi:10.1029/2007JC004585, 2008.; Blockley, E. W., Martin, M. J., McLaren, A. J., Ryan, A. G., Waters, J., Lea, D. J., Mirouze, I., Peterson, K. A., Sellar, A., and Storkey, D.: Recent development of the Met Office operational ocean forecasting system: an overview and assessment of the new Global FOAM forecasts, Geosci. Model Dev. Discuss., 6, 6219–6278, doi:10.5194/gmdd-6-6219-2013, 2013.; Breivik, Ø. and Sætra, Ø.: Real time assimilation of HF radar currents into a coastal ocean model, J. Marine Syst., 28, 161–182, 2001.; Brassington, G. B., Pugh, T., Spillman, C., Schulz, E., Beggs, H., Schiller, A., and Oke, P. R.: BLUElink Development of operational oceanography and servicing, Journal of Research and Practice in Information Technology, 39, 151–164, 2007.; Chapman, D. C.: Numerical treatment of cross-shelf open boundaries in a barotropic coastal ocean model, J. Phys. Oceanogr., 15, 1060–1075, 1985.; Chapman, R., Shay, L., Graber, H., Edson, J., Karachintsev, A., Trump, C., and Ross, D.: On the accuracy of HF radar surface current measurements: intercomparisons with ship-based sensors, J. Geophys. Res.-Oceans (1978–2012), 102, 18737–18748, 1997.; Courtier, P., Thépaut, J.-N., and Hollingsworth, A.: A strategy for operational implementation of 4D-Var, using an incremental approach, Q. J. Roy. Meteor. Soc., 120, 1367–1387, 1994.; Davis, R. E.: Drifter observations of coastal surface currents during CODE: The method and descriptive view, J. Geophys. Res.-Oceans, 90, 4741–4755, 1985.; Dimet, F.-X. L. E., and Talagrand, O.: Variational algorithms for analysis and assimilation of meteorological observations: theoretical aspects, Tellus A, 38, 97–110, 1986.; Evensen, G.: The Ensemble Kalman Filter: theoretical formulation and practical implementation, Ocean Dynam., 53, 343–367, 2003.; Flather, R. A.: A tidal model of the north-west European continental shelf, Memoires de la Society Royal des Sciences de Liege, 10, 141–164, 1976.; Fu, L.-L., Christensen, E. J., Yamarone, C. A., Lefebvre, M., Ménard, Y., Dorrer, M., and Escudier, P.: TOPEX/POSEIDON mission overview, J. Geophys. Res.-Oceans, 99, 24369–24381, 1994.; Gurgel, K.-W., Antonischki, G., Essen, H.-H., and Schlick, T.: Wellen Radar (WERA): a new ground-wave HF radar for ocean remote sensing, Coast. Eng., 37, 219–234, 1999.; Isachsen, P.: Baroclinic instability and eddy tracer transport across sloping bottom topography: How well does a modified Eady model do in primitive equation simulations?, Ocean Model., 39, 183–199, 2011.; Kjelaas, A. G. and Whelan, C.: Rapidly deployable SeaSonde for modeling oil spill response, Sea Technol., 52, 10–13, 2011.; Kristiansen, J., Bjørge, D., Berge, H., Simonsen, M., Torheim, T., Aasen, I.-L., Rooney, G., and Edwards, J.: Improving the screen temperature forecasts of the Norwegian configuration of the UM: on model interoperability with respect to soil initial conditions, in: Unified Model User Workshop, Exeter, UK, 9–11 November 2009, 2009.; Liu, Y. and Weisberg, R. H.: Evaluation of trajectory modeling in different dynamic regions using normalized cumulative Lagrangian separation, J. Geophys. Res.-Oceans, 116


Click To View

Additional Books

  • Optimal Adjustment of the Atmospheric Fo... (by )
  • Ice-shelf – Ocean Interactions at Fimbul... (by )
  • The Vertical Structure of Oceanic Rossby... (by )
  • Responses of Atmospheric Circulation to ... (by )
  • Seismic Imaging of a Thermohaline Stairc... (by )
  • Assessment of an Ensemble System That As... (by )
  • Computation of a New Mean Dynamic Topogr... (by )
  • Exchange Across the Shelf Break at High ... (by )
  • A Robust Method for Removal of Glint Eff... (by )
  • Spatio-temporal Complexity Analysis of t... (by )
  • Chl A Trends in European Seas Estimated ... (by )
  • A Study of the Hydrographic Conditions i... (by )
Scroll Left
Scroll Right


Copyright © World Library Foundation. All rights reserved. eBooks from World eBook 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.