Search found 1013 matches

by Ming Chen
Thu Sep 24, 2020 1:50 am
Forum: WRF Physics
Topic: Aerosol climatology file with aer_opt=2
Replies: 2
Views: 22

Re: Aerosol climatology file with aer_opt=2

I think aer_opt = 2 was used by the contributor applying daily aerosol data, not climatology, although if such a climatology exists, it probably can be used. And yes, the climatology can be different. Our aer_opt = 1 uses aerosol climatology from the 90s. Thompson's is obtained from global model sim...
by Ming Chen
Wed Sep 23, 2020 4:54 pm
Forum: WRF Physics
Topic: why the H_DIABATIC(from microphysics) contains negative values?
Replies: 2
Views: 12

Re: why the H_DIABATIC(from microphysics) contains negative values?

H_DIABATIC is latent heating from microphysics. It can be positive and negative, depending on the physics that is going on in microphysics scheme.
by Ming Chen
Tue Sep 22, 2020 6:14 pm
Forum: ungrib
Topic: Problem Ungrib: Data Not Found- New GFS data
Replies: 12
Views: 990

Re: Problem Ungrib: Data Not Found- New GFS data

I am not sure which version of WPS you are using. It is possible that older version of WPS cannot process new GFS data.
Please update your WPS to the latest version (WPSv4.2), then try again and let me know if you still have the same issue.
by Ming Chen
Fri Sep 18, 2020 9:16 pm
Forum: Miscellaneous WRF
Topic: Indoor air temperature and floor temperature in WRF-BEM
Replies: 3
Views: 56

Re: Indoor air temperature and floor temperature in WRF-BEM

Yes they are always on their native model grids both horizontally and vertically.
by Ming Chen
Fri Sep 18, 2020 9:11 pm
Forum: WRF Physics
Topic: wrf stops at cldfra1
Replies: 7
Views: 142

Re: wrf stops at cldfra1

Please stay with debug_level = 0 because this option doesn't always provide helpful information. You are right that you need to find the first time and grid point where NaN occurs. Form there you can trace back to other variables related to this NaN and possibly figure out what is wrong. Another opt...
by Ming Chen
Fri Sep 18, 2020 9:07 pm
Forum: ungrib
Topic: Error running ungrib using ERA5
Replies: 1
Views: 8

Re: Error running ungrib using ERA5

Hana,
What are the error message you get when ungribbing ERA5?
Please also tell me the following information:
(1) list of ERA files you download from CISL
(2) Vtaable you use
(3) Please attach your nameless.input for me to take a look.
by Ming Chen
Fri Sep 18, 2020 9:04 pm
Forum: ungrib
Topic: error in output.f90(unit=13)
Replies: 3
Views: 23

Re: error in output.f90(unit=13)

Would you please double check the file gfs.t00z.pgrb2.0p50.f000, and find what time it is for?
Please try the command
wgrib -s gfs.t00z.pgrb2.0p50.f000
or if you are familiar with NCL,
ncl_convert2nc gfs.t00z.pgrb2.0p50.f000
Then look at the netCDF file.
by Ming Chen
Wed Sep 16, 2020 8:41 pm
Forum: geogrid
Topic: ./geogrid.exe: symbol lookup error
Replies: 3
Views: 68

Re: ./geogrid.exe: symbol lookup error

for__b_fmt_table looks like a Fortran run-time-library problem. Please make sure your LD_LIBRARY_PATH is set correctly. In addition, note that libraries and include-files for different MPI versions (OpenMPI, MPICH, etc) and/or for different underlying compiler-set are not compatible with each other....
by Ming Chen
Wed Sep 16, 2020 5:27 pm
Forum: WRF Physics
Topic: Get eta levels from model heights
Replies: 3
Views: 135

Re: Get eta levels from model heights

Wenli,
You are right that it makes no sense to specify eta_level for ideal cases.
by Ming Chen
Wed Sep 16, 2020 5:24 pm
Forum: WRF Physics
Topic: wrf stops at cldfra1
Replies: 7
Views: 142

Re: wrf stops at cldfra1

Peter, In this case at least we know for sure that the problem is induced by extremely high model top. To detect when and where the error occurs, please save wrfrst file at the nearest time before the model crash, then restart the model and save wrfout at every time step. Please look at these wrfout...
by Ming Chen
Mon Sep 14, 2020 5:18 pm
Forum: High-performance Computing
Topic: Using multiple Nodes with mpirun -np 16 ./wrf.exe command
Replies: 1
Views: 63

Re: Using multiple Nodes with mpirun -np 16 ./wrf.exe command

Lin, Please see my answers below to your questions: (1) You need to run WRF with multiple nodes, i.e., mpirun -n 24 ./wrf.exe Please consult your computer manage fr correct command stye (different machines might be different) (2) You don't need to specify memory for each node (3) You can always comp...
by Ming Chen
Mon Sep 14, 2020 5:10 pm
Forum: Miscellaneous WPS
Topic: How can I know which interpolation method was used
Replies: 4
Views: 147

Re: How can I know which interpolation method was used

The interpolation method available in WPS can always be used with the current version of codes.
by Ming Chen
Mon Sep 14, 2020 5:05 pm
Forum: ungrib
Topic: error in output.f90(unit=13)
Replies: 3
Views: 23

Re: error in output.f90(unit=13)

This error clearly indicates that you don't have GFS data for the time 2020-09-13_00.
Please double check your GRIB files and enamelist.wps, make sure that ALL GFS data are available for the period specified in namelist.wps.
by Ming Chen
Mon Sep 14, 2020 5:03 pm
Forum: ungrib
Topic: “Error: Data not found” error msg for GFS 1.0
Replies: 5
Views: 175

Re: “Error: Data not found” error msg for GFS 1.0

Please type the command:
ncdump -v Times wrfbdy_d01,
and you will find how many times of boundary forcing you have. This will also tell whether your integration time period is beyond the period your boundary forcing data are available.
by Ming Chen
Mon Sep 14, 2020 5:00 pm
Forum: ungrib
Topic: ungrib.exe not found when intalling WPS
Replies: 4
Views: 65

Re: ungrib.exe not found when intalling WPS

All,
Please take a look at the post here, which solves the problem of ungrib compiling.
viewtopic.php?f=28&t=9367
by Ming Chen
Mon Sep 14, 2020 4:57 pm
Forum: geogrid
Topic: ./geogrid.exe: symbol lookup error
Replies: 3
Views: 68

Re: ./geogrid.exe: symbol lookup error

Would you please tell the following information:
(1) How did you compile WRF? Which compiler did you use? Which WRF version did you compile?
(2) How did you compile WPS, e.g., in serial or dmpar mode? Which version of WPS did you use?
by Ming Chen
Mon Sep 14, 2020 4:53 pm
Forum: geogrid
Topic: ERROR: No TRUELAT1 specified for Lambert conformal projection.
Replies: 5
Views: 77

Re: ERROR: No TRUELAT1 specified for Lambert conformal projection.

It is possibly because the specified value of truelat in the previous namelist.wps is integer, while the WPS program expects a real type. However, this still doesn't explain why the code complains of a variable that is not used based on the namelist setting.
by Ming Chen
Mon Sep 14, 2020 4:28 pm
Forum: Miscellaneous WRF
Topic: droplet number concentration variable
Replies: 1
Views: 62

Re: droplet number concentration variable

I am not sure what physics scheme are you using? Please clarify. But I don''t think CCN has the same physical meaning as Nd.
One variable, QNC, the cloud water Number concentration, might be helpful in your study. Please take a look.
by Ming Chen
Mon Sep 14, 2020 4:19 pm
Forum: Miscellaneous WRF
Topic: Indoor air temperature and floor temperature in WRF-BEM
Replies: 3
Views: 56

Re: Indoor air temperature and floor temperature in WRF-BEM

Please find the lines below in Registry.EM_CMMON: state real TLEV_URB3D i{umap6}j misc 1 Z r "TLEV_URB3D" "INDOOR TEMPERATURE" "K" state real TFLEV_URB3D i{umap9}j misc 1 Z r "TFLEV_URB3D" "FLOOR TEMPERATURE" "K" change them to: state real TLEV_URB3D i{umap6}j misc 1 Z rh "TLEV_URB3D" "INDOOR TEMPER...
by Ming Chen
Mon Sep 14, 2020 4:15 pm
Forum: Miscellaneous WRF
Topic: Unit of POTEVP
Replies: 1
Views: 29

Re: Unit of POTEVP

Xun,
The unit of potevp is m, which is true least since WRFV3.6. I don't think the computation of this variable is changed. It is possible that the definition of its unit is wrong in WRFv3.3.1.
by Ming Chen
Mon Sep 14, 2020 4:01 pm
Forum: WRF Physics
Topic: wrf stops at cldfra1
Replies: 7
Views: 142

Re: wrf stops at cldfra1

Peter, Those netCDF errors are not really errors, and they will not lead to model crash. In this case, apparently the model physics is wrong. (1) As I suggested in my previous answer, would you please run this case with lower model top and less vertical levels? This test will let us know whether the...
by Ming Chen
Mon Sep 14, 2020 3:48 pm
Forum: WRF Physics
Topic: WRF formulation of saturation vapor pressure
Replies: 1
Views: 42

Re: WRF formulation of saturation vapor pressure

svp1, svp2 and svp3 are constants for saturation vapor pressure calculation. The first two variables are dimensionless and svp3 has the unit of K. The algorithm to compute saturate water vapor pressure is ES=svp1*exp(svp2*(T-svpt0)/(T-svp3)) Note that the value of svp1 can be specified to either 611...
by Ming Chen
Mon Sep 14, 2020 3:19 pm
Forum: WRF Physics
Topic: Running WRF with MERRA data
Replies: 1
Views: 40

Re: Running WRF with MERRA data

I suppose the model crashed very soon after the initialization. Please let me know if I am wrong, Would you please provide more information: (1) The Merra data in pressure level or on model level? (2) Can you attach the program merra2wrf for me to take a look? (3) Please double check the rsl files f...
by Ming Chen
Wed Sep 09, 2020 2:09 am
Forum: Job/Position Opportunities
Topic: postdoc position for Regional Modeling of Land-Atmosphere Interactions over the North America
Replies: 0
Views: 55

postdoc position for Regional Modeling of Land-Atmosphere Interactions over the North America

Terrestrial water, ecosystem, and climates are intimately coupled, coevolving earth system. We aim to improve the understanding of the coupled system dynamics by developing and implementing newly developed models of soil and plant hydraulics in regional climate models through a NASA funded project. ...
by Ming Chen
Fri Sep 04, 2020 6:57 pm
Forum: geogrid
Topic: ERROR: No TRUELAT1 specified for Lambert conformal projection.
Replies: 5
Views: 77

Re: ERROR: No TRUELAT1 specified for Lambert conformal projection.

Have you compared the two namelist.wps you used? Is there any difference between the two? There must be a reason why the previous run complained of the truelat setting (I suppose you run with the same georgic.exe).

Go to advanced search