[Wrf-users] RIP trajectories

[Fast, Jerome D]

Angel,

A version of FLEXPART (that computes forward/backward trajectories and
dispersion) compatible with WRF is available at the following page:

http://zardoz.nilu.no/~andreas/flextra+flexpart.html

Then scroll down to look for the WRF-version link. This version of
FLEXPART-WRF on the web was designed for version 2.1 of WRF.  NCAR changed a
few things in 2.2 for some unknown reasons. To fix flexpart for v2.2 the
following routines need to be changed for the 'P_TOP' variable:
 
Gridcheck.f
Gridcheck_nests.f
Readwind.f
Readwind_nests.f

Change ndims_exp = 2 to ndims_exp = 1.

Also, change lines 276 and 277 in map_proj_wrf to ny-2 and nx-2 (instead of
ny-1 and nx-1).  This will only be a problem if you are running WRF in a
projection other than polar-stereographic or lambert.  This bounds error was
found by another user using the Mercator projection, that occasionally
resulted in strange trajectory positions.

Jerome Fast

Pacific Northwest National Laboratory
P.O. Box 999, K9-30
Richland, WA 99352
jerome.fast at pnl.gov


On 10/11/07 12:04 AM, "Angel Dimitrov" <stormlaboratory at yahoo.com> wrote:

> 
>  Dear WRF developers and users,
>  
>  Do you know how to extract the latitude and longitude and elevation of the
> location (a point) of backward trajectory let say for 3, 6, 12 hours? I want
> to know the place from where will be advected air to my location.
> 
>  Thank you for your help.
> 
>  Angel
> 
> 
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