| Evaluation of wetland methane emissions across North America using atmospheric data and inverse modeling - :18311 | Office of Oceanic and Atmospheric Research (OAR)
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Evaluation of wetland methane emissions across North America using atmospheric data and inverse modeling
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  • DOI:
    http://dx.doi.org/10.5194/bg-13-1329-2016
  • Personal Authors:
  • Description:
    Existing estimates of methane (CH4) fluxes from North American wetlands vary widely in both magnitude and distribution. In light of these differences, this study uses atmospheric CH4 observations from the US and Canada to analyze seven different bottom-up, wetland CH4 estimates reported in a recent model comparison project. We first use synthetic data to explore whether wetland CH4 fluxes are detectable at atmospheric observation sites. We find that the observation network can detect aggregate wetland fluxes from both eastern and western Canada but generally not from the US. Based upon these results, we then use real data and inverse modeling results to analyze the magnitude, seasonality, and spatial distribution of each model estimate. The magnitude of Canadian fluxes in many models is larger than indicated by atmospheric observations. Many models predict a seasonality that is narrower than implied by inverse modeling results, possibly indicating an oversensitivity to air or soil temperatures. The LPJ-Bern and SDGVM models have a geographic distribution that is most consistent with atmospheric observations, depending upon the region and season. These models utilize land cover maps or dynamic modeling to estimate wetland coverage while most other models rely primarily on remote sensing inundation data.

  • Document Type:
    Journal Article
  • Collection(s):
    Office of Oceanic and Atmospheric Research (OAR)
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      Feingold, G.; McComiskey, A.; Yamaguchi, T.; Johnson, J. S.; Carslaw, K. S.; Schmidt, K. S.;
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      2016
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      Proceedings of the National Academy of Sciences of the United States of America, 113(21), 5812-5819.
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      CIRES (Cooperative Institute for Research in Environmental Sciences)
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      2016
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      2016
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      CIRES (Cooperative Institute for Research in Environmental Sciences)
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      Radiocarbon in CO2 ((CO2)-C-14) measurements can aid in discriminating between fast (< 1 year) and slower (> 5-10 years) cycling of C between the atmosphere and the terrestrial biosphere due to the 14C disequilibrium between atmospheric and terrestri...
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      2016
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      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      We investigate the role of mesoscale eddies in modulating air-sea CO2 flux and associated biogeochemical fields in Drake Passage using in situ observations and an eddy-resolving numerical model. Both observations and model show a negative correlation...
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      Description:
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      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      From 2007 to 2013, the globally averaged mole fraction of methane in the atmosphere increased by 5.7 +/- 1.2 ppb yr(-1). Simultaneously, delta C-13(CH4) (a measure of the C-13/C-12 isotope ratio in methane) has shifted to significantly more negative ...
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      Krauchi, A.; Philipona, R.; Romanens, G.; Hurst, D. F.; Hall, E. G.; Jordan, A. F.;
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      Atmospheric Measurement Techniques, 9(3), 929-938.
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      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      In situ upper-air measurements are often made with instruments attached to weather balloons launched at the surface and lifted into the stratosphere. Present-day balloon-borne sensors allow near-continuous measurements from the Earth's surface to abo...
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      2016
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      Journal of Geophysical Research-Atmospheres, 121(13), 8055-8066.
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      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      Atmospheric turbulence quantities, boundary layer ozone (O-3) levels, and O-3 deposition to the tundra surface were investigated at Toolik Lake, AK, during the 2011 summer season. Beginning immediately after snowmelt, a diurnal cycle of O-3 in the at...
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      Filetype[PDF - 2.83 MB]
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      Personal Author:
      Sweeney, C.; Dlugokencky, E.; Miller, C. E.; Wofsy, S.; Karion, A.; Dinardo, S.; Chang, R. Y. W.; Miller, J. B.; Bruhwiler, L.; Crotwell, A. M.; Newberger, T.; McKain, K.; Stone, R. S.; Wolter, S. E.; Lang, P. E.; Tans, P.;
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      2016
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      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
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      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
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      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
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      Published:
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      Journal of Geophysical Research-Atmospheres, 122(2), 1203-1223.
      Series:
      CIRES (Cooperative Institute for Research in Environmental Sciences)
      Description:
      A 20 month cloud condensation nucleus concentration (N-CCN) data set from Graciosa Island (39 degrees N, 28 degrees W) in the remote North Atlantic is used to characterize air masses with low cloud condensation nuclei (CCN) concentrations. Low-CCN ev...
      File Type:
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      2016
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      CIRES (Cooperative Institute for Research in Environmental Sciences)
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