POP2 tidal mixing dataset exceeds total expected dissipation?!

[h_salehipour@utoronto_ca]

Hi AllThe POP2 forcing dataset when averaged globally gives us a total dissipation of around ~1.9 TW (The information of this dataset for tidal mixing is given below). This is much higher that what we expect to see for the total tidal dissipation which should be around 1.2 with the M2 component accounting for ~0.6-0.8 TW (as for example suggested by the abyssal recipes II and Egbert et al 2004). I would appreciate it if anyone could point us to the flaw in this calculation or in the dataset? Regards,Hesam PS. The input data set name and information is:

The files are from
inputdata/ocn/pop/gx1v6/forcing
The file name is:
tidal_energy_gx1v6_20090205.ieeer8
or the netcdf file conversion of this:
tidal_energy_gx1v6_20090205.nc

The README: tidal_energy_gx1v6_20090205.readme
--------------------------------------------------
  2.  created by: Steve Yeager

  3.  date and time:  Feb 2009


  8.  creation details:

      tidal dissipation and conversion of tidal energy to internal
      waves computed from a barotropic tidal model using a
      parameterization for the internal wave energy conversion
      (see reference below).

      ran /fis/cgd/oce/yeager/POP_tools/regrid < energy_gx1v6_nml  in the
        this regridded the .5x.5 tidal energy data to gx1v5c

      ran /fis01/cgd/oce/yeager/POP_grids/gx1v6/nc2ieeer8.run to
        convert from netcdf to ieeer8

  9.  derived from: see above?
                based on .5x.5degree netcdf file created on 23-Mar-2006
                /fs/cgd/home0/yeager/ccsm_forcing/tidal_energy/energy_new.nc
                by Steve Jayne.

the reference for this work is:

Jayne, S. R., and L. C. St. Laurent, 2001: Parameterizing
Tidal Dissipation over Rough Topography. Geophysical
Research Letters, Vol. 28, pp. 811-814.

For further information, see:

St. Laurent, L. C., H. L. Simmons, and S. R. Jayne, 2002:
Estimates of Tidally Driven Enhanced Mixing in the Deep
Ocean. Geophysical Research Letters, Vol. 29,
doi:10.1029/2002GL015633.

Simmons, H. L., S. R. Jayne, L. C. St. Laurent, and A. J.
Weaver, 2004: Tidally Driven Mixing in a Numerical Model of
the Ocean General Circulation. Ocean Modelling, Vol. 6, pp.
245-263, doi:10.1016/S1463-5003(03)00011-8.

Jayne, S. R., L. C. St. Laurent, and S. T. Gille, 2004:
Connections Between Ocean Bottom Topography and Earth's
Climate. Oceanography, Vol. 17, pp. 65-74.

 

[gokhan]

Hesam,Please take a look at the last paragraph of section 2 (just before section 2a) of Jayne (2009, JPO,v39, 1756-1775). The number that you are getting is consistent with what is reported there. The file contains theenergy available for dissipation, not the total dissipated energy. As discussed in Eq. (2) of the same paper, thereare efficiency and local dissipation factors involved.
Best,Gokhan