[Wrf-users] how to get wrffdda with ndown

Feng Liu FLiu at azmag.gov
Wed Dec 8 15:20:13 MST 2010

Hi, there,
I am running WRFchem3.2.1. For two-way nesting run, it is not able to handle chemistry initialization for finer nested grids with previous runs. So I have to switch to one-way nesting. The real.exe produces wrfbdy_d01, wrfinput_d01 and wrffda_d01 in my case. Rename wrfinput_d01 file into wrfndi_d02.  Note that interval between the lateral boundary condition in wrfbdy_01 and wrffdda_d01 data is the same as input data, for example, 3-hourly, 10800 seconds. The ndown.exe, using wrfndi_d02 and coarse grid wrfout files with hourly output time, 3600 seconds, produces wrfinput_d02 and wrfbdy_d02 with hourly interval. Then rename the both files into *_d01 in order to run wrf.exe in single finer domain. However, wrf.exe always crashed down at this point without any referrible error message. I suspect this caused by the  mismatched time interval between wrffdda_d01 produced by real.exe and wrfbdy_d02 by ndown.exe. The later does not produce wrffdda_d02.  How to get the time  matched wrffdda for one way nesting run? Do I have to get back to WPS to produce hourly outputs? And then pick up the wrffdda_d01 with the same frequency?

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