# I had some problems with mozart2camx handling the cam-chem output

**URL:** <https://forum.cmascenter.org/t/i-had-some-problems-with-mozart2camx-handling-the-cam-chem-output/4117>\
**Category:** CMAQ\
**Created:** [May 16, 2023, 4:50am UTC](https://forum.cmascenter.org/t/i-had-some-problems-with-mozart2camx-handling-the-cam-chem-output/4117 "2023-05-16T04:50:52Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![wsnuist](https://avatars.discourse-cdn.com/v4/letter/w/47e85d/32.png) [@wsnuist](https://forum.cmascenter.org/u/wsnuist)\
**Post date:** [May 16, 2023, 4:50am UTC](https://forum.cmascenter.org/t/i-had-some-problems-with-mozart2camx-handling-the-cam-chem-output/4117/1 "2023-05-16T04:50:52Z")

</div>

Here are the steps to process:

1. Download WACCM outputs from [https://www.acom.ucar.edu/waccm/DATA/](https://www.acom.ucar.edu/waccm/DATA/).  
Download CAM-Chem outputs from [CAM-Chem Download](https://www.acom.ucar.edu/cam-chem/cam-chem.shtml).

2. Run NCF2IOAPI to convert to the Models3/IOAPI format.

3. Run MOZART2CAMX to generate CAMx or CMAQ IC/BCs.  
Choose/compile the executable with the appropriate speciation mappings  
**--------------------------------------------------------------------------------------------------------------------------**

I am doing step 2 when I execute **INFILE=camchem-20230515081556321601.nc ./NCF2IOAPI** , some error messages come up, **for example:**  
**--------------------------------------------------------------------------------------------------------------------------**  
Inquire variables  
V\_Index, V\_Dims, V\_NAME, V\_UNIT, V\_DESC, Dim\_ID,  
1, 4, ALKNIT, mol/mol, ALKNIT concentration, 4 3 2 1  
2, 4, BCARY, mol/mol, BCARY concentration, 4 3 2 1

**…**

75, 4, Z3, m, Geopotential Height (above sea level), 4 3 2 1  
76, 4, bc\_a1, kg/kg, bc\_a1 concentration, 4 3 2 1  
77, 4, bc\_a4, kg/kg, bc\_a4 concentration, 4 3 2 1  
netCDF error:NetCDF: Attribute not found  
78, 1, ch4vmr, , ch4 volume mixing ratio, 1  
netCDF error:NetCDF: Attribute not found  
79, 1, co2vmr, , co2 volume mixing ratio, 1  
netCDF error:NetCDF: Attribute not found  
80, 1, date, , current date (YYYYMMDD), 1  
netCDF error:NetCDF: Attribute not found  
netCDF error:NetCDF: Attribute not found  
81, 2, date\_written, , , 5 1  
netCDF error:NetCDF: Attribute not found  
82, 1, datesec, , current seconds of current date, 1  
83, 4, dst\_a1, kg/kg, dst\_a1 concentration, 4 3 2 1  
84, 4, dst\_a2, kg/kg, dst\_a2 concentration, 4 3 2 1  
85, 4, dst\_a3, kg/kg, dst\_a3 concentration, 4 3 2 1  
netCDF error:NetCDF: Attribute not found  
86, 1, f11vmr, , f11 volume mixing ratio, 1  
netCDF error:NetCDF: Attribute not found  
87, 1, f12vmr, , f12 volume mixing ratio, 1  
netCDF error:NetCDF: Attribute not found  
88, 1, gw, , latitude weights, 3  
netCDF error:NetCDF: Attribute not found  
89, 1, hyai, , hybrid A coefficient at layer interfaces, 6  
netCDF error:NetCDF: Attribute not found  
90, 1, hyam, , hybrid A coefficient at layer midpoints, 2  
netCDF error:NetCDF: Attribute not found  
91, 1, hybi, , hybrid B coefficient at layer interfaces, 6  
netCDF error:NetCDF: Attribute not found  
**--------------------------------------------------------------------------------------------------------------------------**  
**Why is that? Do these errors matter?**