Methyl halide and methane fluxes in the northern Alaskan coastal tundra
[ 1] The Arctic tundra is a major source and sink of carbon-containing gases, but the biogeochemical cycling of halocarbons in this ecosystem has been largely unexplored. In this study, coastal tundra fluxes of methyl halides (CH3Cl, CH3Br, and CH3I) and methane (CH4) were measured near Barrow, Alas...
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/de88d6d0-1dc4-4fc9-a637-35a1aa3b78c2 2023-05-15T14:51:52+02:00 Methyl halide and methane fluxes in the northern Alaskan coastal tundra Rhew, Robert C. Teh, Yit Arn Abel, Triffid 2007-04-25 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/methyl-halide-and-methane-fluxes-in-the-northern-alaskan-coastal-tundra(de88d6d0-1dc4-4fc9-a637-35a1aa3b78c2).html https://doi.org/10.1029/2006JG000314 eng eng info:eu-repo/semantics/restrictedAccess Rhew , R C , Teh , Y A & Abel , T 2007 , ' Methyl halide and methane fluxes in the northern Alaskan coastal tundra ' , Journal of Geophysical Research , vol. 112 , no. G2 , G02009 , pp. - . https://doi.org/10.1029/2006JG000314 ARCTIC TUNDRA UTILIZING BACTERIA ISOTOPE FRACTIONATION AIR-TEMPERATURE CARBON-DIOXIDE SOIL CARBON CO2 FLUX BROMIDE CHLORIDE EMISSIONS article 2007 ftunstandrewcris https://doi.org/10.1029/2006JG000314 2021-12-26T14:20:27Z [ 1] The Arctic tundra is a major source and sink of carbon-containing gases, but the biogeochemical cycling of halocarbons in this ecosystem has been largely unexplored. In this study, coastal tundra fluxes of methyl halides (CH3Cl, CH3Br, and CH3I) and methane (CH4) were measured near Barrow, Alaska (71 degrees N, 157 degrees W) during the 2005 growing season. Sites covered a range of microtopographic features including drained lake basins, channels, and high- and low-centered ice-wedge polygons. CH3Cl and CH3Br fluxes varied significantly with hydrologic conditions, with progressively higher net uptake rates observed with decreasing soil saturation. Drained tundra sites averaged - 620 nmol CH3Cl m(-2) d(-1) and - 9.8 nmol CH3Br m(-2) d(-1) while flooded tundra sites averaged -14 nmol CH3Cl m(-2) d(-1) and + 1.1 nmol CH3Br m(-2) d(-1). CH3Cl and CH3Br fluxes were positively correlated with each other as well as with CH4 emissions, suggesting that consumption of both compounds occurs primarily in aerobic environments. Average CH3I net emissions were relatively weak (4.0 nmol m(-2) d(-1)). Average methane fluxes (2.0 mmol m(-2) d(-1)) and their relationship with soil moisture were comparable to tundra emissions reported by prior studies. Methane fluxes showed a marked seasonality, with emissions tripling between early and late in the growing season, but methyl halide fluxes did not show a similar temporal trend. If these measurements are representative of the Arctic tundra, then the Arctic tundra is a regionally important sink for CH3Cl and CH3Br but a trivial source of CH3I. Article in Journal/Newspaper Arctic Barrow Tundra Alaska University of St Andrews: Research Portal Arctic Journal of Geophysical Research 112 G2 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
ARCTIC TUNDRA UTILIZING BACTERIA ISOTOPE FRACTIONATION AIR-TEMPERATURE CARBON-DIOXIDE SOIL CARBON CO2 FLUX BROMIDE CHLORIDE EMISSIONS |
spellingShingle |
ARCTIC TUNDRA UTILIZING BACTERIA ISOTOPE FRACTIONATION AIR-TEMPERATURE CARBON-DIOXIDE SOIL CARBON CO2 FLUX BROMIDE CHLORIDE EMISSIONS Rhew, Robert C. Teh, Yit Arn Abel, Triffid Methyl halide and methane fluxes in the northern Alaskan coastal tundra |
topic_facet |
ARCTIC TUNDRA UTILIZING BACTERIA ISOTOPE FRACTIONATION AIR-TEMPERATURE CARBON-DIOXIDE SOIL CARBON CO2 FLUX BROMIDE CHLORIDE EMISSIONS |
description |
[ 1] The Arctic tundra is a major source and sink of carbon-containing gases, but the biogeochemical cycling of halocarbons in this ecosystem has been largely unexplored. In this study, coastal tundra fluxes of methyl halides (CH3Cl, CH3Br, and CH3I) and methane (CH4) were measured near Barrow, Alaska (71 degrees N, 157 degrees W) during the 2005 growing season. Sites covered a range of microtopographic features including drained lake basins, channels, and high- and low-centered ice-wedge polygons. CH3Cl and CH3Br fluxes varied significantly with hydrologic conditions, with progressively higher net uptake rates observed with decreasing soil saturation. Drained tundra sites averaged - 620 nmol CH3Cl m(-2) d(-1) and - 9.8 nmol CH3Br m(-2) d(-1) while flooded tundra sites averaged -14 nmol CH3Cl m(-2) d(-1) and + 1.1 nmol CH3Br m(-2) d(-1). CH3Cl and CH3Br fluxes were positively correlated with each other as well as with CH4 emissions, suggesting that consumption of both compounds occurs primarily in aerobic environments. Average CH3I net emissions were relatively weak (4.0 nmol m(-2) d(-1)). Average methane fluxes (2.0 mmol m(-2) d(-1)) and their relationship with soil moisture were comparable to tundra emissions reported by prior studies. Methane fluxes showed a marked seasonality, with emissions tripling between early and late in the growing season, but methyl halide fluxes did not show a similar temporal trend. If these measurements are representative of the Arctic tundra, then the Arctic tundra is a regionally important sink for CH3Cl and CH3Br but a trivial source of CH3I. |
format |
Article in Journal/Newspaper |
author |
Rhew, Robert C. Teh, Yit Arn Abel, Triffid |
author_facet |
Rhew, Robert C. Teh, Yit Arn Abel, Triffid |
author_sort |
Rhew, Robert C. |
title |
Methyl halide and methane fluxes in the northern Alaskan coastal tundra |
title_short |
Methyl halide and methane fluxes in the northern Alaskan coastal tundra |
title_full |
Methyl halide and methane fluxes in the northern Alaskan coastal tundra |
title_fullStr |
Methyl halide and methane fluxes in the northern Alaskan coastal tundra |
title_full_unstemmed |
Methyl halide and methane fluxes in the northern Alaskan coastal tundra |
title_sort |
methyl halide and methane fluxes in the northern alaskan coastal tundra |
publishDate |
2007 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/methyl-halide-and-methane-fluxes-in-the-northern-alaskan-coastal-tundra(de88d6d0-1dc4-4fc9-a637-35a1aa3b78c2).html https://doi.org/10.1029/2006JG000314 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Barrow Tundra Alaska |
genre_facet |
Arctic Barrow Tundra Alaska |
op_source |
Rhew , R C , Teh , Y A & Abel , T 2007 , ' Methyl halide and methane fluxes in the northern Alaskan coastal tundra ' , Journal of Geophysical Research , vol. 112 , no. G2 , G02009 , pp. - . https://doi.org/10.1029/2006JG000314 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/2006JG000314 |
container_title |
Journal of Geophysical Research |
container_volume |
112 |
container_issue |
G2 |
_version_ |
1766323012571758592 |