 |
| Titel |
Approximate Stokes Drift Profiles and their use in Ocean Modelling |
| VerfasserIn |
Øyvind Breivik, Jea-Raymond Bidlot, Peter A. E. M. Janssen, Kristian Mogensen |
| Konferenz |
EGU General Assembly 2016
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250125934
|
| Publikation (Nr.) |
 EGU/EGU2016-5592.pdf |
|
|
|
|
|
| Zusammenfassung |
| Deep-water approximations to the Stokes drift velocity profile are explored as alternatives to
the monochromatic profile. The alternative profiles investigated rely on the same two
quantities required for the monochromatic profile, viz the Stokes transport and the surface
Stokes drift velocity. Comparisons against parametric spectra and profiles under wave spectra
from the ERA-Interim reanalysis and buoy observations reveal much better agreement than
the monochromatic profile even for complex sea states. That the profiles give a closer match
and a more correct shear has implications for ocean circulation models since the
Coriolis-Stokes force depends on the magnitude and direction of the Stokes drift profile and
Langmuir turbulence parameterizations depend sensitively on the shear of the profile. Of the
two Stokes drift profiles explored here, the profile based on the Phillips spectrum is by far the
best. In particular, the shear near the surface is almost identical to that influenced by the f−5
tail of spectral wave models. The NEMO general circulation ocean model was
recently extended to incorporate the Stokes-Coriolis force along with two other
wave-related effects. The ECWMF coupled atmosphere-wave-ocean ensemble forecast
system now includes these wave effects in the ocean model component (NEMO). |
|
|
|
|
|
|