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Spatial and temporal dynamics in eddy covariance observations of methane fluxes at a tundra site in northeastern Siberia

Parmentier, Frans-Jan LU ; van Huissteden, J.; van der Molen, M. K.; Schaepman-Strub, G.; Karsanaev, S. A.; Maximov, T. C. and Dolman, A. J. (2011) In Journal of Geophysical Research 116. p.03016-03016
Abstract
In the past two decades, the eddy covariance technique has been used for an increasing number of methane flux studies at an ecosystem scale. Previously, most of these studies used a closed path setup with a tunable diode laser spectrometer (TDL). Although this method worked well, the TDL has to be calibrated regularly and cooled with liquid nitrogen or a cryogenic system, which limits its use in remote areas. Recently, a new closed path technique has been introduced that uses off-axis integrated cavity output spectroscopy that does not require regular calibration or liquid nitrogen to operate and can thus be applied in remote areas. In the summer of 2008 and 2009, this eddy covariance technique was used to study methane fluxes from a... (More)
In the past two decades, the eddy covariance technique has been used for an increasing number of methane flux studies at an ecosystem scale. Previously, most of these studies used a closed path setup with a tunable diode laser spectrometer (TDL). Although this method worked well, the TDL has to be calibrated regularly and cooled with liquid nitrogen or a cryogenic system, which limits its use in remote areas. Recently, a new closed path technique has been introduced that uses off-axis integrated cavity output spectroscopy that does not require regular calibration or liquid nitrogen to operate and can thus be applied in remote areas. In the summer of 2008 and 2009, this eddy covariance technique was used to study methane fluxes from a tundra site in northeastern Siberia. The measured emissions showed to be very dependent on the fetch area, due to a large contrast in dry and wet vegetation in between wind directions. Furthermore, the observed short-and long-term variation of methane fluxes could be readily explained with a nonlinear model that used relationships with atmospheric stability, soil temperature, and water level. This model was subsequently extended to fieldwork periods preceding the eddy covariance setup and applied to evaluate a spatially integrated flux. The model result showed that average fluxes were 56.5, 48.7, and 30.4 nmol CH4 m(-2) s(-1) for the summers of 2007 to 2009. While previous models of the same type were only applicable to daily averages, the method described can be used on a much higher temporal resolution, making it suitable for gap filling. Furthermore, by partitioning the measured fluxes along wind direction, this model can also be used in areas with nonuniform terrain but nonetheless provide spatially integrated fluxes. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Journal of Geophysical Research
volume
116
pages
03016 - 03016
publisher
American Geophysical Union
external identifiers
  • wos:000293653500001
  • scopus:80051702888
ISSN
2156-2202
DOI
10.1029/2010JG001637
language
English
LU publication?
yes
id
e71f0c0d-40f8-4f6f-bce4-37426fdc0fc4 (old id 2162928)
date added to LUP
2011-09-21 08:33:10
date last changed
2017-10-29 03:18:01
@article{e71f0c0d-40f8-4f6f-bce4-37426fdc0fc4,
  abstract     = {In the past two decades, the eddy covariance technique has been used for an increasing number of methane flux studies at an ecosystem scale. Previously, most of these studies used a closed path setup with a tunable diode laser spectrometer (TDL). Although this method worked well, the TDL has to be calibrated regularly and cooled with liquid nitrogen or a cryogenic system, which limits its use in remote areas. Recently, a new closed path technique has been introduced that uses off-axis integrated cavity output spectroscopy that does not require regular calibration or liquid nitrogen to operate and can thus be applied in remote areas. In the summer of 2008 and 2009, this eddy covariance technique was used to study methane fluxes from a tundra site in northeastern Siberia. The measured emissions showed to be very dependent on the fetch area, due to a large contrast in dry and wet vegetation in between wind directions. Furthermore, the observed short-and long-term variation of methane fluxes could be readily explained with a nonlinear model that used relationships with atmospheric stability, soil temperature, and water level. This model was subsequently extended to fieldwork periods preceding the eddy covariance setup and applied to evaluate a spatially integrated flux. The model result showed that average fluxes were 56.5, 48.7, and 30.4 nmol CH4 m(-2) s(-1) for the summers of 2007 to 2009. While previous models of the same type were only applicable to daily averages, the method described can be used on a much higher temporal resolution, making it suitable for gap filling. Furthermore, by partitioning the measured fluxes along wind direction, this model can also be used in areas with nonuniform terrain but nonetheless provide spatially integrated fluxes.},
  author       = {Parmentier, Frans-Jan and van Huissteden, J. and van der Molen, M. K. and Schaepman-Strub, G. and Karsanaev, S. A. and Maximov, T. C. and Dolman, A. J.},
  issn         = {2156-2202},
  language     = {eng},
  pages        = {03016--03016},
  publisher    = {American Geophysical Union},
  series       = {Journal of Geophysical Research},
  title        = {Spatial and temporal dynamics in eddy covariance observations of methane fluxes at a tundra site in northeastern Siberia},
  url          = {http://dx.doi.org/10.1029/2010JG001637},
  volume       = {116},
  year         = {2011},
}