Bulk versus spectral wave parameters: Implications on Stokes drift estimates, regional wave modeling, and hf radars applications

TitleBulk versus spectral wave parameters: Implications on Stokes drift estimates, regional wave modeling, and hf radars applications
Publication TypeJournal Article
Year of Publication2017
AuthorsKumar N., Cahl D.L, Crosby S.C, Voulgaris G
JournalJournal of Physical Oceanography
Volume47
Pagination1413-1431
Date Published2017/06
Type of ArticleArticle
ISBN Number0022-3670
Accession NumberWOS:000403208900012
Keywordscoastal ocean model; directional spectrum; gravity-waves; high-frequency radar; langmuir turbulence; Shelf; surface currents; system; transport; vortex-force
Abstract

Accurate estimates of Stokes drift are necessary to quantify Lagrangian transport and upper-ocean mixing. These can be estimated from directional wave spectra. Here, a methodology for the reconstruction of such spectra is developed using partitioned bulk wave parameters provided by global wave models. These reconstructed spectra agree well with global wave model-simulated full spectra. Regional wave model simulations with reconstructed spectra as open boundary conditions lead to more accurate estimates of bulk wave parameters in the coastal ocean. Furthermore, the reconstructed directional spectra can be used to improve high-frequency (HF) radar-derived surface Lagrangian current estimates. Stokes drift vertical profiles from complete directional spectra are more accurate, and therefore coupled ocean circulation and wave models should incorporate spectral estimates for wave-current interaction studies. Based on model simulations conducted here, it is recommended that regional wave modeling studies use partitioned rather than bulk wave parameter products from global wave simulations to reconstruct complete directional spectra for open boundary conditions. Finally, this study shows that inclusion of the peak spectral energy for each partition improves the ability to reconstruct more accurately directional spectra and surface Stokes drift. It is recommended that the global wave model hindcast/forecast include this additional bulk parameter.

DOI10.1175/jpo-d-16-0203.1
Student Publication: 
No