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Article
Surface Deformations as Indicators of Deep Ebullition Fluxes in a Large Northern Peatland
Global Biogeochemical Cycles
  • P. H. Glaser
  • J. P. Chanton
  • P. Morin
  • D. O. Rosenberry
  • D. I. Siegel
  • O. Ruud
  • L. I. Chasar
  • Andrew S. Reeve, University of Maine - Main
Document Type
Article
Publication Date
1-7-2004
Publication Number
GB1003
Disciplines
Abstract/ Summary

Peatlands deform elastically during precipitation cycles by small (+/- 3 cm) oscillations in surface elevation. In contrast, we used a Global Positioning System network to measure larger oscillations that exceeded 20 cm over periods of 4 - 12 hours during two seasonal droughts at a bog and fen site in northern Minnesota. The second summer drought also triggered 19 depressuring cycles in an overpressured stratum under the bog site. The synchronicity between the largest surface deformations and the depressuring cycles indicates that both phenomena are produced by the episodic release of large volumes of gas from deep semi-elastic compartments confined by dense wood layers. We calculate that the three largest surface deformations were associated with the release of 136 g CH4 m(-2), which exceeds by an order of magnitude the annual average chamber fluxes measured at this site. Ebullition of gas from the deep peat may therefore be a large and previously unrecognized source of radiocarbon depleted methane emissions from northern peatlands.

Citation/Publisher Attribution
Glaser, PH, Chanton, JP, Morin, P, Rosenberry, DO, Siegel, DI, Ruud, O, Chasar, LI, et al., 2004, Surface Deformations as Indicators of Deep Ebullition Fluxes in a Large Northern Peatland: Global Biogeochemical Cycles, v. 18, GB1003. To view the published open abstract, go to http://dx.doi.org and enter the DOI.
Publisher Statement
© Copyright 2004 American Geophysical Union
DOI
10.1029/2003GB002069
Version
publisher's version of the published document
Citation Information
P. H. Glaser, J. P. Chanton, P. Morin, D. O. Rosenberry, et al.. "Surface Deformations as Indicators of Deep Ebullition Fluxes in a Large Northern Peatland" Global Biogeochemical Cycles Vol. 18 Iss. 1 (2004)
Available at: http://works.bepress.com/andrew_reeve/2/