Hello all, I am running CMAQ ISAM, to do source apportionment study. My CMAQ_MASK file has 9 tags. The problem is the Initial Condition contributes exactly the same as all of my 9 source regions in the SA outputs. My isam_control setting: TAG CLASSES |OZONE,NITRATE,VOC TAG NAME |GR1 …

Thanks. Is the first image you posted based on some inert tracer result with a source in the grid cell you defined as ISAM region? To test whether the unexpected patterns happen because of limitations with the current ISAM code as it relates to secondary gas phase species or persisting problems wit…

[image] YukuiLi: CMAQ hello, I want to know how to generate CMAQ_MASK files.

Hello Yukui, could you please provide some more details on the behavior you are observing? Which species are you looking at? How many days have you simulated, and does the relative magnitude of the IC tag vs. the source region tags change over time? Does the IC tag have the same magnitude as the su…

Here is a link with metadata on 2 example CMAQ mask files (US states and NOAA climate regions): https://dataverse.unc.edu/dataset.xhtml?persistentId=doi:10.15139/S3/XDYYB9 Here is a link to a README text file describing how these files were created: https://drive.google.com/file/d/1bgbMyiFZMYP6…

Hello Hogrefe, I am looking at ozone source appointment. I have run half month dara. The IC tag do change over time. IC tag has the same magnitude as each region tag. So all region tags are identical and they are also the same as IC tag. The BC tag looks reasonable. Thanks. Christian Hogrefe via …

Hello Yukui, thanks for providing this additional information. To confirm, O3_ICON = O3_GR1 = O3_GR2 = … O3_GR9 in your SA_ACONC and SA_CONC output files across all grid cells and output time steps? If you created your own CMAQ_MASK file, can you please post the header of that file and images show…

Thank you Christian. In my SA_ACONC and SA_CONC output files across all grid cells and output time steps, the data do shows O3_ICON = O3_GR1 = O3_GR2 = … O3_GR9. I create my own CMAQ_MASK file. The header of my CMAQ_MASK file is :slight_smile: file global attributes: IOAPI_VERSION : ioapi-3.2: Id…

Hi Yukui, thanks for this additional information. While I don’t know if this causes your problem, the variables used to indicate the region masks should be of type real to represent fractions between 0 and 1, not integers. I don’t know how type conversions are handled when a variable is declared a…

I don’t know how type conversions are handled when a variable is declared as real in CMAQ but defined as integer in the I/OAPI input file There are no conversions: what you will get is bit-patterns 0 or 1, being interpreted as REALs – which means either REAL zero or REAL denormal, respectively. …

Thanks for the information Christian and cjcoats. I used ioapi m3mask to made my CMAQ_MASK file. But according to m3mask, " Reads ASCII mask-data, specified by a file MASKDATA with lines containing either the columns and rows or the latitudes and longitudes, respectively, for the mask being speci…

Here is one thing you could try, but I’ll add two disclaimers: I have not tried this myself Generally, the safest way to manipulate I/O API files would be with the I/O API Fortran interface, i.e. read in the NA_1, NA_2, … NA_9 variables with READ3 into integer arrays, copy them to real arrays, def…

ISAM SA_ACONC output error

CMAQ-ISAM

lizadams October 2, 2020, 7:59pm 19

@YukuiLi - It looks like you reposted this question, and it was answered on the following issue. CMAQV5.3 ISAM Region not found

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ISAM SA_ACONC output error

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