Air concentrations in example data

[jbeaulie]

The air concentrations contained in the example data file (sdgTestData.csv and sdgFormatted.Rda) are exceptionally high for CH4 and N2O (max of 9.1 and 1.43 for CH4 and N2O, respectively). As part of the EPA's 2017 National Lakes Assessment, I am analyzing air and dissolved gas samples from ~1400 lakes across the country. Thus far I have analyzed air samples from 100 lakes with the following results:

N2O: mean = 0.312 sd = 0.004
CO2: mean = 439.1 sd = 42.4
CH4: mean = 1.50 sd = 0.10

I suggest reviewing the data source used for the example data. Are the air concentrations correct and typical for the Neon program? If not, I suggest adopting a more typical data set.

[kcawley]

Very interesting! I'll have to take a look more closely at the sites and dates and see if we find any likely sources.