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bpbond / cpcrw_incubation

PNNL TES incubation of CPCRW soil cores #openexperiment
http://bpbond.github.io/cpcrw_incubation
MIT License
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Do CO2:CH4 ratios make sense? #34

Closed bpbond closed 8 years ago

bpbond commented 8 years ago

So I want to triple-check that these tiny CH4 numbers we're getting are right, or at least I'm not making some stupid math mistake on the way. By way of context, here's the cumulative-flux graph: cumulative_gas

As you can see the ratio of CO2 to CH4 emissions is several million to one.

I've been really freaked out by this--in the sense of holy crap, can this be right? But after spending some time doing research this morning, am feeling a little more confident, but want your feedback @apeyton and Vanessa.

Claire Treat's synthesis paper on anoxic soil incubations includes data on CO2:CH4 emission ratios, and looking at her Table 2 and Figure 2, there are ratios up around a million - and that's for much wetter (more saturated) incubations than ours. On average, she found studies reporting CO2:CH4 emissions rates of 10-1000x for wetland soils.

bpbond commented 8 years ago

Also TODO on this issue - check absolute CO2 emission rates (on a per g soil basis) and make sure they make sense...

Pinging @vlbailey on this too.

vlbailey commented 8 years ago

Getting these notes.

Vanessa L. Bailey Senior Research Scientist Pacific Northwest National Laboratory

From: Ben Bond-Lamberty [mailto:notifications@github.com] Sent: Monday, February 8, 2016 10:09 AM To: bpbond/cpcrw_incubation cpcrw_incubation@noreply.github.com Cc: Bailey, Vanessa L Vanessa.Bailey@pnnl.gov Subject: Re: [cpcrw_incubation] Do CO2:CH4 ratios make sense? (#34)

Also TODO on this issue - check absolute CO2 emission rates (on a per g soil basis) and make sure they make sense...

Pinging @vlbaileyhttps://github.com/vlbailey on this too.

— Reply to this email directly or view it on GitHubhttps://github.com/bpbond/cpcrw_incubation/issues/34#issuecomment-181441683.