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Land-atmosphere exchange of methane from soil thawing to soil freezing in a high-Arctic wet tundra ecosystem

Tagesson, Torbern LU ; Mölder, Meelis LU ; Mastepanov, Mikhail LU ; Sigsgaard, Charlotte; Tamstorf, Mikkel P.; Lund, Magnus; Falk, Julie Maria LU ; Lindroth, Anders LU ; Christensen, Torben LU and Ström, Lena LU (2012) In Global Change Biology 18(6). p.1928-1940
Abstract
The land-atmosphere exchange of methane (CH4) and carbon dioxide (CO2) in a high-Arctic wet tundra ecosystem (Rylek ae rene) in Zackenberg, north-eastern Greenland, was studied over the full growing season and until early winter in 2008 and from before snow melt until early winter in 2009. The eddy covariance technique was used to estimate CO2 fluxes and a combination of the gradient and eddy covariance methods was used to estimate CH4 fluxes. Small CH4 bursts were observed during spring thawing 2009, but these existed during short periods and would not have any significant effect on the annual budget. Growing season CH4 fluxes were well correlated with soil temperature, gross primary production, and active layer thickness. The CH4 fluxes... (More)
The land-atmosphere exchange of methane (CH4) and carbon dioxide (CO2) in a high-Arctic wet tundra ecosystem (Rylek ae rene) in Zackenberg, north-eastern Greenland, was studied over the full growing season and until early winter in 2008 and from before snow melt until early winter in 2009. The eddy covariance technique was used to estimate CO2 fluxes and a combination of the gradient and eddy covariance methods was used to estimate CH4 fluxes. Small CH4 bursts were observed during spring thawing 2009, but these existed during short periods and would not have any significant effect on the annual budget. Growing season CH4 fluxes were well correlated with soil temperature, gross primary production, and active layer thickness. The CH4 fluxes remained low during the entire autumn, and until early winter. No increase in CH4 fluxes were seen as the soil started to freeze. However, in autumn 2008 there were two CH4 burst events that were highly correlated with atmospheric turbulence. They were likely associated with the release of stored CH4 from soil and vegetation cavities. Over the measurement period, 7.6 and 6.5g C m(-2) was emitted as CH4 in 2008 and in 2009, respectively. Rylek ae rene acted as a C source during the warmer and wetter measurement period 2008, whereas it was a C sink for the colder and drier period of 2009. Wet tundra ecosystems, such as Rylek ae rene may thus play a more significant role for the climate in the future, as temperature and precipitation are predicted to increase in the high-Arctic. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Micrometeorology, eddy covariance, gradient method, methane, carbon, balance, tundra, climate change, land-atmosphere interactions
in
Global Change Biology
volume
18
issue
6
pages
1928 - 1940
publisher
Wiley-Blackwell
external identifiers
  • wos:000303763600014
  • scopus:84860689583
ISSN
1354-1013
DOI
10.1111/j.1365-2486.2012.02647.x
project
BECC
MERGE
language
English
LU publication?
yes
id
32a1230a-6547-44c8-bccd-c504a7edd024 (old id 2826488)
date added to LUP
2012-06-20 14:24:46
date last changed
2017-11-12 03:04:41
@article{32a1230a-6547-44c8-bccd-c504a7edd024,
  abstract     = {The land-atmosphere exchange of methane (CH4) and carbon dioxide (CO2) in a high-Arctic wet tundra ecosystem (Rylek ae rene) in Zackenberg, north-eastern Greenland, was studied over the full growing season and until early winter in 2008 and from before snow melt until early winter in 2009. The eddy covariance technique was used to estimate CO2 fluxes and a combination of the gradient and eddy covariance methods was used to estimate CH4 fluxes. Small CH4 bursts were observed during spring thawing 2009, but these existed during short periods and would not have any significant effect on the annual budget. Growing season CH4 fluxes were well correlated with soil temperature, gross primary production, and active layer thickness. The CH4 fluxes remained low during the entire autumn, and until early winter. No increase in CH4 fluxes were seen as the soil started to freeze. However, in autumn 2008 there were two CH4 burst events that were highly correlated with atmospheric turbulence. They were likely associated with the release of stored CH4 from soil and vegetation cavities. Over the measurement period, 7.6 and 6.5g C m(-2) was emitted as CH4 in 2008 and in 2009, respectively. Rylek ae rene acted as a C source during the warmer and wetter measurement period 2008, whereas it was a C sink for the colder and drier period of 2009. Wet tundra ecosystems, such as Rylek ae rene may thus play a more significant role for the climate in the future, as temperature and precipitation are predicted to increase in the high-Arctic.},
  author       = {Tagesson, Torbern and Mölder, Meelis and Mastepanov, Mikhail and Sigsgaard, Charlotte and Tamstorf, Mikkel P. and Lund, Magnus and Falk, Julie Maria and Lindroth, Anders and Christensen, Torben and Ström, Lena},
  issn         = {1354-1013},
  keyword      = {Micrometeorology,eddy covariance,gradient method,methane,carbon,balance,tundra,climate change,land-atmosphere interactions},
  language     = {eng},
  number       = {6},
  pages        = {1928--1940},
  publisher    = {Wiley-Blackwell},
  series       = {Global Change Biology},
  title        = {Land-atmosphere exchange of methane from soil thawing to soil freezing in a high-Arctic wet tundra ecosystem},
  url          = {http://dx.doi.org/10.1111/j.1365-2486.2012.02647.x},
  volume       = {18},
  year         = {2012},
}