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Use of high temporal resolution Use of high temporal resolution data to characterize CHdata to characterize CH44 emission emission
pathways in a temperate pathways in a temperate peatlandpeatland
Jordan GoodrichJordan GoodrichAdvisors: Ruth Varner,Advisors: Ruth Varner,
Steve Frolking,Steve Frolking,
Bryan DuncanBryan Duncan
Uncertainty in Emission Estimates
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WetlandsEnergy
RuminantsLandfills
Rice AgricultureBiomass Burning
TermitesOcean
Hydrates
Waste Treatment
OtherSoil Sink
Stratospheric Loss
OH Sink
Total SourceTotal Sink
Global Methane Flux (Tg CH4/yr)
Minimum Maximum
Soi
l Sin
k
Str
atos
pher
ic L
oss
OH
Sin
k
Tota
l Sin
k
Sources
Sinks
Background• CH4 flux measurements
– Most seasonal estimates are based on weekly flux measurements
– Focus primarily on growing season dynamics
– Manual measurements tend to be restricted to stable atmospheric
conditions
• Emission Pathways
– Diffusion
– Plant Mediated
– Ebullition
Wetland CH4 Flux at Sallie’s Fen
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1 2 3 4 5 6 7 8 9 10 11 12
Month of Year
mg CH
4 m-2 d
-1
Monthly mean CH4 flux for 19 years for 9 collars, binned by dominant species. Green squares are collars dominated by Carex and Sphagnum while blue triangles are shrub dominated collars.
Research Questions
• What is the temporal variability of CH4 flux?– What are the controls?
• Can ebullition be observed with autochambers?– Partition other processes?
• Will higher resolution measurements change annual estimates of CH4 emissions from this wetland?
CH4 flux time series with 1-day running mean (April 4 - July 22)
- Ideal diffusive flux curves are common at this resolution
4:16pm 4:18pm 4:20pm 4:22pm 4:24pm 4:26pm
- Ebullitive fluxes seem to be well captured: new
processing method is needed
∆ [CH4] due to bubble
10:55pm 10:56pm 10:57pm 10:58pm
Time
NASA Chem-Climate Model CH4
Questions?
• Acknowledgements – Research & Discover
– Tuula Larmola– Eduardo Miranda
Model EmissionsGlobal Methane Trends
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