[Wrf-users] spectral nudging for water vapor?

[Spero, Tanya]

Xiaoming -

The current WRF code does not allow spectral nudging of moisture.  However, my colleagues and I built some code into WRF to allow spectral nudging toward moisture, and we published on how using spectral nudging toward moisture can improve regional climate simulations.  We have not contributed that code back to NCAR yet to be considered for the public release of WRF.

Spero, T. L., M. J. Otte, J. H. Bowden, and C. G. Nolte, 2014:  Improving the representation of clouds, radiation, and precipitation using spectral nudging in the Weather Research and Forecasting model.  J. Geophys. Res. Atmos., 119, 11,682-11,694, doi:10.1002/2014JD022173.

Tanya

~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tanya L. Spero
National Exposure Research Laboratory
U.S. Environmental Protection Agency
109 T. W. Alexander Dr., Mail Drop E243-01
Research Triangle Park, NC  27711  USA
+1-919-541-7533 (voice)



From: wrf-users-bounces at ucar.edu [mailto:wrf-users-bounces at ucar.edu] On Behalf Of xiaoming Hu
Sent: Monday, February 29, 2016 4:26 PM
To: wrf-users at ucar.edu; wrfhelp at ucar.edu
Cc: Xiaoming Hu <xhu at ou.edu>
Subject: [Wrf-users] spectral nudging for water vapor?


Can I do spectral nudging for water vapor in WRF?

I did 2 runs, one setting "gq = 0" and the other one with "gq = 1.0E-5"
The 2 runs turned out to be identical.

I checked the code
   SUBROUTINE spectral_nudging(grid,itimestep,dt,xtime,id,analysis_interval, end_fdda_hour, &
               if_no_pbl_nudging_uv, if_no_pbl_nudging_t, if_no_pbl_nudging_ph,&
               if_zfac_uv, k_zfac_uv, dk_zfac_uv, &
               if_zfac_t, k_zfac_t, dk_zfac_t, &
               if_zfac_ph, k_zfac_ph, dk_zfac_ph, &
               guv, gt, gph,


appears gq is not even passed in.

So I guess the current WRF can not do spectral nudging for water vapor.

Could anybody confirm?

Thanks

Xiaoming

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