Tagged: instruments separations
February 7, 2012 at 11:50 am #1385
This is my first time running EddyPro 3.0.0, or at least trying to do so! I have defined the metadata, declared the raw file format and am generally ready to go except that I cannot select any flux calculation options as they are all greyed out.
What am I missing?
CaroleFebruary 7, 2012 at 5:50 pm #1555
In case you are talking about the “Select Options for Flux Computation” on the “Dataset Selection” tab, I had the same problem.
Here are my suggestions that fixed the problem for me:
1-If you are using a Gill anemometer, make sure to make a selection under “North alignment”, either Spar or Axis, in the “Instruments” tab under “Project Creation”.
2-For the Gas Analyzer in the “Instruments” tab, make sure that at least one of the separation values it NOT zero (Northward, Eastward, Vertical). You should put in the correct values, but just ignoring those fields entirely does not seem to work (and it makes sense too).
3-If all the information in the “Instruments” tab is correct, you should be able to select those instruments (anemometer/gas analyzer) in the “Raw File Description” tab. I don’t know if that is really necessary, but I couldn’t do it prior to the correct instrument setup.
4-If that’s all set, you should be able to select your master anemometer and gas analyzer for CO2/H2O flux computation (for example) in the “Data Selection” tab.
Best regardsFebruary 8, 2012 at 4:48 pm #1558
Tom your reply is on point. It is most probably the issue of the separation. We thought about relaxing the requirement so that you can process the data with no separation. But we decided it is better if the software reminds you to take a second look and enter the correct separation value or at least enter the smallest possible value (0.01cm) without significantly affecting the resulting computation.
Can you think of a situation where separation would not be needed?
IsraelFebruary 8, 2012 at 9:05 pm #1559
No, based on my (albeit limited) experience I cannot think of such a setting. Sometimes the required numbers are just not at hand, so one is tempted to skip those entries and go ahead with processing.February 9, 2012 at 7:55 am #1561
Tom, I would say that’s a good reason to keep the current control in EddyPro. 🙂
Not entering the separations may lead to serious flux underestimation, depending on the EC setup. On the other hand, as Israel mentioned, if one really wants to enter a “zero separation”, it is perfectly ok to enter the minimum value (0.01 cm) in any separation, that will allow EddyPro to run and will not introduce any over-correction. In both cases, the user is aware of what he/she is doing.
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