(Table 1) Climate characteristics of the four North American Tundra Experiment (ITEX) sites
Climate warming is expected to differentially affect CO2 exchange of the diverse ecosystems in the Arctic. Quantifying responses of CO2 exchange to warming in these ecosystems will require coordinated experimentation using standard temperature manipulations and measurements. Here, we used the Intern...
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Format: | Dataset |
Language: | English |
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PANGAEA
2007
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.817624 https://doi.org/10.1594/PANGAEA.817624 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.817624 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Alaska USA Alexandra Fiord Area/locality Atqasuk Barrow Comment Degree days thawing ELEVATION Ellesmere Island Canadian Arctic Archipelago Event label International Polar Year (2007-2008) IPY ITEX_AF ITEX_AT ITEX_BA ITEX_TL Latitude of event Longitude of event Monitoring station MONS Precipitation sum Temperature air annual mean monthly mean Toolik Lake |
spellingShingle |
Alaska USA Alexandra Fiord Area/locality Atqasuk Barrow Comment Degree days thawing ELEVATION Ellesmere Island Canadian Arctic Archipelago Event label International Polar Year (2007-2008) IPY ITEX_AF ITEX_AT ITEX_BA ITEX_TL Latitude of event Longitude of event Monitoring station MONS Precipitation sum Temperature air annual mean monthly mean Toolik Lake Oberbauer, Steven F Tweedie, Craig E Welker, Jeff M Fahnestock, Jace T Henry, Gregory HR Webber, Patrick J Hollister, Robert D Walker, Marilyn D Kuchy, Andrea Elmore, Elizabeth Starr, Gregory (Table 1) Climate characteristics of the four North American Tundra Experiment (ITEX) sites |
topic_facet |
Alaska USA Alexandra Fiord Area/locality Atqasuk Barrow Comment Degree days thawing ELEVATION Ellesmere Island Canadian Arctic Archipelago Event label International Polar Year (2007-2008) IPY ITEX_AF ITEX_AT ITEX_BA ITEX_TL Latitude of event Longitude of event Monitoring station MONS Precipitation sum Temperature air annual mean monthly mean Toolik Lake |
description |
Climate warming is expected to differentially affect CO2 exchange of the diverse ecosystems in the Arctic. Quantifying responses of CO2 exchange to warming in these ecosystems will require coordinated experimentation using standard temperature manipulations and measurements. Here, we used the International Tundra Experiment (ITEX) standard warming treatment to determine CO2 flux responses to growing-season warming for ecosystems spanning natural temperature and moisture ranges across the Arctic biome. We used the four North American Arctic ITEX sites (Toolik Lake, Atqasuk, and Barrow [USA] and Alexandra Fiord [Canada]) that span 10° of latitude. At each site, we investigated the CO2 responses to warming in both dry and wet or moist ecosystems. Net ecosystem CO2 exchange (NEE), ecosystem respiration (ER), and gross ecosystem photosynthesis (GEP) were assessed using chamber techniques conducted over 24-h periods sampled regularly throughout the summers of two years at all sites. At Toolik Lake, warming increased net CO2 losses in both moist and dry ecosystems. In contrast, at Atqasuk and Barrow, warming increased net CO2 uptake in wet ecosystems but increased losses from dry ecosystems. At Alexandra Fiord, warming improved net carbon uptake in the moist ecosystem in both years, but in the wet and dry ecosystems uptake increased in one year and decreased the other. Warming generally increased ER, with the largest increases in dry ecosystems. In wet ecosystems, high soil moisture limited increases in respiration relative to increases in photosynthesis. Warming generally increased GEP, with the notable exception of the Toolik Lake moist ecosystem, where warming unexpectedly decreased GEP >25%. Overall, the respiration response determined the effect of warming on ecosystem CO2 balance. Our results provide the first multiple-site comparison of arctic tundra CO2 flux responses to standard warming treatments across a large climate gradient. These results indicate that (1) dry tundra may be initially the most ... |
format |
Dataset |
author |
Oberbauer, Steven F Tweedie, Craig E Welker, Jeff M Fahnestock, Jace T Henry, Gregory HR Webber, Patrick J Hollister, Robert D Walker, Marilyn D Kuchy, Andrea Elmore, Elizabeth Starr, Gregory |
author_facet |
Oberbauer, Steven F Tweedie, Craig E Welker, Jeff M Fahnestock, Jace T Henry, Gregory HR Webber, Patrick J Hollister, Robert D Walker, Marilyn D Kuchy, Andrea Elmore, Elizabeth Starr, Gregory |
author_sort |
Oberbauer, Steven F |
title |
(Table 1) Climate characteristics of the four North American Tundra Experiment (ITEX) sites |
title_short |
(Table 1) Climate characteristics of the four North American Tundra Experiment (ITEX) sites |
title_full |
(Table 1) Climate characteristics of the four North American Tundra Experiment (ITEX) sites |
title_fullStr |
(Table 1) Climate characteristics of the four North American Tundra Experiment (ITEX) sites |
title_full_unstemmed |
(Table 1) Climate characteristics of the four North American Tundra Experiment (ITEX) sites |
title_sort |
(table 1) climate characteristics of the four north american tundra experiment (itex) sites |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.817624 https://doi.org/10.1594/PANGAEA.817624 |
op_coverage |
MEDIAN LATITUDE: 72.315832 * MEDIAN LONGITUDE: -134.885835 * SOUTH-BOUND LATITUDE: 68.633330 * WEST-BOUND LONGITUDE: -157.400000 * NORTH-BOUND LATITUDE: 78.880000 * EAST-BOUND LONGITUDE: -75.910000 * MINIMUM ELEVATION: 3 m a.s.l. * MAXIMUM ELEVATION: 740 m a.s.l. |
long_lat |
ENVELOPE(-75.797,-75.797,78.885,78.885) ENVELOPE(-157.400000,-75.910000,78.880000,68.633330) |
geographic |
Alexandra Fiord Arctic Canada Canadian Arctic Archipelago Ellesmere Island |
geographic_facet |
Alexandra Fiord Arctic Canada Canadian Arctic Archipelago Ellesmere Island |
genre |
Alexandra Fiord Archipelago Arctic Archipelago Arctic Barrow Canadian Arctic Archipelago Ellesmere Island International Polar Year IPY Tundra Alaska |
genre_facet |
Alexandra Fiord Archipelago Arctic Archipelago Arctic Barrow Canadian Arctic Archipelago Ellesmere Island International Polar Year IPY Tundra Alaska |
op_source |
Supplement to: Oberbauer, Steven F; Tweedie, Craig E; Welker, Jeff M; Fahnestock, Jace T; Henry, Gregory HR; Webber, Patrick J; Hollister, Robert D; Walker, Marilyn D; Kuchy, Andrea; Elmore, Elizabeth; Starr, Gregory (2007): Tundra CO2 fluxes in response to experimental warming across latitudinal and moisture gradients. Ecological Monographs, 77(2), 221-238, https://doi.org/10.1890/06-0649 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.817624 https://doi.org/10.1594/PANGAEA.817624 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.817624 https://doi.org/10.1890/06-0649 |
_version_ |
1766268493632634880 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.817624 2023-05-15T13:15:25+02:00 (Table 1) Climate characteristics of the four North American Tundra Experiment (ITEX) sites Oberbauer, Steven F Tweedie, Craig E Welker, Jeff M Fahnestock, Jace T Henry, Gregory HR Webber, Patrick J Hollister, Robert D Walker, Marilyn D Kuchy, Andrea Elmore, Elizabeth Starr, Gregory MEDIAN LATITUDE: 72.315832 * MEDIAN LONGITUDE: -134.885835 * SOUTH-BOUND LATITUDE: 68.633330 * WEST-BOUND LONGITUDE: -157.400000 * NORTH-BOUND LATITUDE: 78.880000 * EAST-BOUND LONGITUDE: -75.910000 * MINIMUM ELEVATION: 3 m a.s.l. * MAXIMUM ELEVATION: 740 m a.s.l. 2007-08-06 text/tab-separated-values, 20 data points https://doi.pangaea.de/10.1594/PANGAEA.817624 https://doi.org/10.1594/PANGAEA.817624 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.817624 https://doi.org/10.1594/PANGAEA.817624 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Oberbauer, Steven F; Tweedie, Craig E; Welker, Jeff M; Fahnestock, Jace T; Henry, Gregory HR; Webber, Patrick J; Hollister, Robert D; Walker, Marilyn D; Kuchy, Andrea; Elmore, Elizabeth; Starr, Gregory (2007): Tundra CO2 fluxes in response to experimental warming across latitudinal and moisture gradients. Ecological Monographs, 77(2), 221-238, https://doi.org/10.1890/06-0649 Alaska USA Alexandra Fiord Area/locality Atqasuk Barrow Comment Degree days thawing ELEVATION Ellesmere Island Canadian Arctic Archipelago Event label International Polar Year (2007-2008) IPY ITEX_AF ITEX_AT ITEX_BA ITEX_TL Latitude of event Longitude of event Monitoring station MONS Precipitation sum Temperature air annual mean monthly mean Toolik Lake Dataset 2007 ftpangaea https://doi.org/10.1594/PANGAEA.817624 https://doi.org/10.1890/06-0649 2023-01-20T09:01:28Z Climate warming is expected to differentially affect CO2 exchange of the diverse ecosystems in the Arctic. Quantifying responses of CO2 exchange to warming in these ecosystems will require coordinated experimentation using standard temperature manipulations and measurements. Here, we used the International Tundra Experiment (ITEX) standard warming treatment to determine CO2 flux responses to growing-season warming for ecosystems spanning natural temperature and moisture ranges across the Arctic biome. We used the four North American Arctic ITEX sites (Toolik Lake, Atqasuk, and Barrow [USA] and Alexandra Fiord [Canada]) that span 10° of latitude. At each site, we investigated the CO2 responses to warming in both dry and wet or moist ecosystems. Net ecosystem CO2 exchange (NEE), ecosystem respiration (ER), and gross ecosystem photosynthesis (GEP) were assessed using chamber techniques conducted over 24-h periods sampled regularly throughout the summers of two years at all sites. At Toolik Lake, warming increased net CO2 losses in both moist and dry ecosystems. In contrast, at Atqasuk and Barrow, warming increased net CO2 uptake in wet ecosystems but increased losses from dry ecosystems. At Alexandra Fiord, warming improved net carbon uptake in the moist ecosystem in both years, but in the wet and dry ecosystems uptake increased in one year and decreased the other. Warming generally increased ER, with the largest increases in dry ecosystems. In wet ecosystems, high soil moisture limited increases in respiration relative to increases in photosynthesis. Warming generally increased GEP, with the notable exception of the Toolik Lake moist ecosystem, where warming unexpectedly decreased GEP >25%. Overall, the respiration response determined the effect of warming on ecosystem CO2 balance. Our results provide the first multiple-site comparison of arctic tundra CO2 flux responses to standard warming treatments across a large climate gradient. These results indicate that (1) dry tundra may be initially the most ... Dataset Alexandra Fiord Archipelago Arctic Archipelago Arctic Barrow Canadian Arctic Archipelago Ellesmere Island International Polar Year IPY Tundra Alaska PANGAEA - Data Publisher for Earth & Environmental Science Alexandra Fiord ENVELOPE(-75.797,-75.797,78.885,78.885) Arctic Canada Canadian Arctic Archipelago Ellesmere Island ENVELOPE(-157.400000,-75.910000,78.880000,68.633330) |