CMAQ can use boundary conditions derived from global chemistry models (GCMs) like MOZART. I use mozart2camx to process mozart output and get CMAQ v5.3 IC, BC. However, CMAQ complains 1) IC is not time-dependent, and 2) BC has wrong time stamp. It is easy to fix the first issue by updating IC netcdf…

Christian Hogrefe, I fixed the problem by re-downloading the code file. Now it works now. Thank you very much.

Use M3Tools program m3interp t https://www.cmascenter.org/ioapi/documentation/all_versions/html/M3CPLE.html to interpolate 6-hour BC’s into 1-hour BC’s. IMNHO as the original systems architect for CMAQ, I feel that it is improper for the input time steps to be hard-coded the way you describe. The o…

Hi cjcoats, Thank you for your response. Using m3tools may be a good idea. But I need to look at how. IC file should be time-independent in CMAQ v5.3. Otherwise it crashes with the following error messages: I updated the TFLAG and changed TIME STEP into 0 in the proper time point input IC file. I…

Hi fliu, Regarding the ability of CMAQ to handle boundary condition files with time steps other than 1 hour, we have posted a code update here . This code update will also be included with the next minor CMAQ release. Regarding the issue your reported with your IC file, CMAQv5.3 can handle both…

Hogrefe.christian, Thank you very much for the great updates. I replace the file with the new one according to the README - CMAQv5.3 Know Issues. But I get following errors when I recompile the CCTM. I have no idea and wonder if this code is still uncompleted. Thank you very much for taking the ti…

Hi I want to compile and run mozart2camx. Could you help me on how to do that, please? Thank you Best regards, Ensiyeh

Hello Ensiyeh, please see our response to your duplicate question in a different thread . In the future, please do not post the same question in more than one thread. The mozart2camx program is not part of the CMAQ suite of tools and is not supported by the CMAS center or the CMAQ development team.…

Hi cjcoats I want to convert BC file with 6-hours time step to 1-hours time step. The BC file is Netcdf and I want to use m3interp from I/O API to do this work. Should we convert Netcdf to i/o api first? If yes, could you guide me on how to convert netcdf to i/o api, please? Thank you

m3interp need I/O API input, so you need to do that conversion first. Does CMAQ now require that the BC files have an hourly time-step? The original prototype did not care; it would time-interpolate from whatever timestep the BC’s had…

Hi Thank you. I start a project with CMAQv5.2 and now I must work with it. Could you guide me how to convert netcdf file to I/O API file, please? I must interpolate BC file with m3interp and merge some data with m3cple. Could you help me, pleaese? Thank you

Unfortunately, because of the complexity and lack of file-structure definition, “convert netcdf file to I/O API file” is almost an artificial- (or human-)intelligence problem: you don’t really know what to expect in the file, and you can’t always even use ncdump -h to tell you everything you need …

Time Stamp Issue to use MOZART output as CMAQ5.3 ICBC

CMAQ

skunwar May 11, 2020, 8:23pm 18

Maybe a question I posed elsewhere in the forum would also be relevant here:

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Time Stamp Issue to use MOZART output as CMAQ5.3 ICBC

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