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Spatial and interannual variability of trace gas fluxes in a heterogeneous High Arctic landscape

Grøndahl, Louise ; Friborg, Thomas ; Christensen, Torben LU ; Ekberg, Anna LU ; Elberling, Bo ; Illeris, Lotte ; Nordstrøm, Claus ; Rennermalm, Åsa ; Sigsgaard, Carlotte and Søgaard, Henrik (2008) 40. p.473-498
Abstract
Summertime measurements of CO2 and CH4 fluxes were carried out over a range of high-arctic ecosystem types in the valley Zackenbergdalen since 1996 using both chamber and eddy covariance methodology. The net ecosystem CO2 exchange and CH4 flux data presented reveal a high degree of inter-annual variability within the dominant vegetation types in the valley, but also show distinct differences between them. In particular, the wet and dry parts of the valley show distinct differences. In general, the wet parts of the valley, the fens dominated by white cotton grass Eriophorum scheuchzeri, show high productivity, also in comparison with other sites, whereas CO2 uptake rates in the white arctic bell heather Cassiope tetragona and mountain avens... (More)
Summertime measurements of CO2 and CH4 fluxes were carried out over a range of high-arctic ecosystem types in the valley Zackenbergdalen since 1996 using both chamber and eddy covariance methodology. The net ecosystem CO2 exchange and CH4 flux data presented reveal a high degree of inter-annual variability within the dominant vegetation types in the valley, but also show distinct differences between them. In particular, the wet and dry parts of the valley show distinct differences. In general, the wet parts of the valley, the fens dominated by white cotton grass Eriophorum scheuchzeri, show high productivity, also in comparison with other sites, whereas CO2 uptake rates in the white arctic bell heather Cassiope tetragona and mountain avens Dryas spp.-dominated heaths are much smaller. Also within the different ecosystem types, a high degree of spatial variability can be documented. The spatial variability both within and between ecosystem types is especially pronounced for the CH4 flux and can, at least partly, be related to differences in vegetation composition and water table level. The importance of the CH4 emission from the various ecosystem types is evaluated both in relation to carbon and greenhouse gas budgets. In both wet and drier ecosystem components, inter-annual variability seems best explained through differences in the amount and distribution of snow in spring and the length of the growing season. A large number of replicate chamber measurements carried out over various vegetation types in the valley are used to produce a synthesis of 10 years of flux data available on growing season carbon dynamics and CH4 emission patterns in the individual parts of this high-arctic ecosystem and relates the differences between the ecosystems found in Zackenbergdalen to comparable sites in the circumpolar North. (Less)
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author
; ; ; ; ; ; ; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
High-arctic ecosystem dynamics in a changing climate - Ten years of monitoring and research at Zackenberg Research Station, Northeast Greenland (Advances in Ecological Research)
editor
Meltofte, Hans ; Christensen, Torben ; Elberling, Bo ; Forchhammer, Mads and Rasch, Morten
volume
40
pages
473 - 498
publisher
Elsevier
external identifiers
  • wos:000256528000020
  • scopus:41349121141
ISSN
0065-2504
ISBN
978-0-12-373665-9
DOI
10.1016/S0065-2504(07)00020-7
language
English
LU publication?
yes
id
f94bcc1a-4b99-482d-8f57-c700f138c78b (old id 712926)
date added to LUP
2016-04-01 13:55:51
date last changed
2020-02-26 04:01:32
@inbook{f94bcc1a-4b99-482d-8f57-c700f138c78b,
  abstract     = {Summertime measurements of CO2 and CH4 fluxes were carried out over a range of high-arctic ecosystem types in the valley Zackenbergdalen since 1996 using both chamber and eddy covariance methodology. The net ecosystem CO2 exchange and CH4 flux data presented reveal a high degree of inter-annual variability within the dominant vegetation types in the valley, but also show distinct differences between them. In particular, the wet and dry parts of the valley show distinct differences. In general, the wet parts of the valley, the fens dominated by white cotton grass Eriophorum scheuchzeri, show high productivity, also in comparison with other sites, whereas CO2 uptake rates in the white arctic bell heather Cassiope tetragona and mountain avens Dryas spp.-dominated heaths are much smaller. Also within the different ecosystem types, a high degree of spatial variability can be documented. The spatial variability both within and between ecosystem types is especially pronounced for the CH4 flux and can, at least partly, be related to differences in vegetation composition and water table level. The importance of the CH4 emission from the various ecosystem types is evaluated both in relation to carbon and greenhouse gas budgets. In both wet and drier ecosystem components, inter-annual variability seems best explained through differences in the amount and distribution of snow in spring and the length of the growing season. A large number of replicate chamber measurements carried out over various vegetation types in the valley are used to produce a synthesis of 10 years of flux data available on growing season carbon dynamics and CH4 emission patterns in the individual parts of this high-arctic ecosystem and relates the differences between the ecosystems found in Zackenbergdalen to comparable sites in the circumpolar North.},
  author       = {Grøndahl, Louise and Friborg, Thomas and Christensen, Torben and Ekberg, Anna and Elberling, Bo and Illeris, Lotte and Nordstrøm, Claus and Rennermalm, Åsa and Sigsgaard, Carlotte and Søgaard, Henrik},
  booktitle    = {High-arctic ecosystem dynamics in a changing climate - Ten years of monitoring and research at Zackenberg Research Station, Northeast Greenland (Advances in Ecological Research)},
  editor       = {Meltofte, Hans and Christensen, Torben and Elberling, Bo and Forchhammer, Mads and Rasch, Morten},
  isbn         = {978-0-12-373665-9},
  issn         = {0065-2504},
  language     = {eng},
  pages        = {473--498},
  publisher    = {Elsevier},
  title        = {Spatial and interannual variability of trace gas fluxes in a heterogeneous High Arctic landscape},
  url          = {http://dx.doi.org/10.1016/S0065-2504(07)00020-7},
  doi          = {10.1016/S0065-2504(07)00020-7},
  volume       = {40},
  year         = {2008},
}