# Ocean Modeling Discussion

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 Post subject: wind stressPosted: Fri Jan 12, 2018 4:01 pm

Joined: Thu Feb 15, 2007 12:19 pm
Posts: 10
Location: Helmholtz Zentrum Geesthacht
Is the wind stress calculation in ROMS corrected with the water velocity at the sea surface?

Reiner

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 Post subject: Re: wind stressPosted: Fri Jan 12, 2018 4:09 pm

Joined: Wed Jul 02, 2003 5:29 pm
Posts: 3501
Location: IMS/UAF, USA
No, the default bulk_flux is not corrected for the ocean velocity. It's not that hard to do, though, and the bulk_flux I use does have it:
Code:
vmag   = max(umin, sqrt( (Uwind(i,j)-u(i,j,N(ng),nrhs))**2 +  &
&                             (Vwind(i,j)-v(i,j,N(ng),nrhs))**2) )

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 Post subject: Re: wind stressPosted: Sun Jan 14, 2018 2:50 am

Joined: Mon Apr 28, 2003 5:44 pm
Posts: 454
Location: Rutgers University
In bulk_flux.F the components Uwind,Vwind are defined at rho points, not the staggered u,v points, so better code would be:

Code:
Uwind(i,j)=Uwind(i,j)-0.5_r8*                                 &
&               (u(i,j,N(ng),nrhs)+u(i+1,j,N(ng),nrhs))
Vwind(i,j)=Vwind(i,j)-0.5_r8*                                 &
&               (v(i,j,N(ng),nrhs)+v(i,j+1,N(ng),nrhs))

Also, it is better to modify Uwind,Vwind directly at the beginning of bulk_flux.F because the sign of the components is subsequently used to determine the direction of the stress vector.

In very strong tidal flows (in our experience, Georges Bank and Gulf of Maine) the current is sufficient to reverse the direction of the stress in many instances.

Related to this issue of the ocean surface current feedback to the atmosphere there is a nice recent (2016) paper by Renault et al. "Modulation of Wind Work by Oceanic Current Interaction with the Atmosphere" http://journals.ametsoc.org/doi/abs/10. ... -15-0232.1

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John Wilkin: IMCS Rutgers University
71 Dudley Rd, New Brunswick, NJ 08901-8521, USA. ph: 609-630-0559 jwilkin@rutgers.edu

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