March 22, 2016 at 8:49 pm #7730
I started using EddyPro for flux calculations recently and I am experiencing a strange problem.
My data files are ASCIIcsv, consisting of CSAT3 data and a LI7500A open path analyzer. Everything works out fine when I create the metadata file and the custom columns, indicating the position of the wind vectors and the CO2 and H2O fluxes.
When I get to ‘Basic Settings’, however, I cannot select the variables for CO2 and H2O. The only selectable variables are the LI7500A diagnostics, tenperature, and pressure.
The program will run without the flux variables but I end up without CO2 and H2O fluxes.
Is this a known bug? Has anybody experienced this before and has been able to solve the problem?March 22, 2016 at 9:52 pm #7732
The issue is most likely related to the description of the gas analyzer or the gas analyzer variables in the metadata.
EddyPro expects at leas one separation (East, North or Vertical) value for a gas to be different from zero. So make sure that is correctly entered.
For the CO2 and H2O variables make sure you have the appropriate measurement type and unit selected. Make sure also they are properly assigned to a gas analyzer.March 23, 2016 at 1:22 pm #7733
Thanks for your response. I followed your advice and double-checked the analyzer description and now I can access the flux variables. However, my output level 1 file does not show any values (-9999.9) for co2, h2o and the other variables except the CSAT3 variables.
I have attached my metadata file. Perhaps you can identify where I am making a mistake?March 23, 2016 at 6:50 pm #7736
The metadata seems okay. The output file you attached is the raw data output back as EddyPro read it. It has not been processed at all. So it seems like EddyPro is reading all -9999 from your data file. Can you may be attach a sample data file?March 23, 2016 at 9:07 pm #7737
please find attached a sample of my data.
Thanks in advanceMarch 28, 2016 at 10:08 pm #7741
I checked the data and the metadata and I found the issue.
You are using the last column in the data as the LI-7500/A/RS diagnostic variable. Are you sure about this? The diagnostic variable for the LI-7500/A/RS is binary word that contains information about the different critical components. If you are indeed using an LI-7500A then that number should be typically 200-255. In the sample data it is simply zero. EddyPro uses the diagnostic information to decide whether the data is good or bad. If the value is zero it means there is an issue with the analyzer and the data is not good.
That is why you don’t get any CO2 and H2O outputs.April 4, 2016 at 12:44 am #7744
Thanks a lot! I have now disabled the diagnostic value column and now I can get the fluxes.
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