The role of soil characteristics on measured and modelled carbon dioxide and energy fluxes for Arctic dwarf shrub tundra sites
Four years of growing season eddy covariance measurements of net carbon dioxide (CO2) and energy fluxes were used to examine the similarities/differences in surface-atmosphere interactions at two dwarf shrub tundra sites within Canada’s Southern Arctic ecozone, separated by approximately 1000 km. Bo...
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ftawi:oai:epic.awi.de:52022 2023-05-15T14:27:38+02:00 The role of soil characteristics on measured and modelled carbon dioxide and energy fluxes for Arctic dwarf shrub tundra sites Meyer, Gesa Humphreys, Elyn Melton, Joe R. Lafleur, Peter Marsh, Philip Detto, Matteo Helbig, Manuel Boike, Julia Voigt, Carolina Sonnentag, O. 2020-05 https://epic.awi.de/id/eprint/52022/ https://hdl.handle.net/10013/epic.d42393da-4a4c-4446-9f10-80d812082796 unknown Meyer, G. , Humphreys, E. , Melton, J. R. , Lafleur, P. , Marsh, P. , Detto, M. , Helbig, M. , Boike, J. orcid:0000-0002-5875-2112 , Voigt, C. and Sonnentag, O. (2020) The role of soil characteristics on measured and modelled carbon dioxide and energy fluxes for Arctic dwarf shrub tundra sites , EGU General Assembly 2020, 4 May 2020 - 8 May 2020 . doi:10.5194/egusphere-egu2020-11913 <https://doi.org/10.5194/egusphere-egu2020-11913> , hdl:10013/epic.d42393da-4a4c-4446-9f10-80d812082796 EPIC3EGU General Assembly 2020, 2020-05-04-2020-05-08 Conference notRev 2020 ftawi https://doi.org/10.5194/egusphere-egu2020-11913 2021-12-24T15:45:33Z Four years of growing season eddy covariance measurements of net carbon dioxide (CO2) and energy fluxes were used to examine the similarities/differences in surface-atmosphere interactions at two dwarf shrub tundra sites within Canada’s Southern Arctic ecozone, separated by approximately 1000 km. Both sites, Trail Valley Creek (TVC) and Daring Lake (DL1), are characterised by similar climate (with some differences in radiation due to latitudinal differences), vegetation composition and structure, and are underlain by continuous permafrost, but differ in their soil characteristics. Total atmospheric heating (the sum of latent and sensible heat fluxes) was similar at the two sites. However, at DL1, where the surface organic layer was thinner and mineral soil coarser in texture, latent heat fluxes were greater, sensible heat fluxes were lower, soils were warmer and the active layer thicker. At TVC, cooler soils likely kept ecosystem respiration relatively low despite similar total growing season productivity. As a result, the 4-year mean net growing season ecosystem CO2 uptake (May 1 - September 30) was almost twice as large at TVC (64 ± 19 g C m-2) compared to DL1 (33 ± 11 g C m-2). These results highlight that soil and thaw characteristics are important to understand variability in surface-atmosphere interactions among tundra ecosystems. As recent studies have shown, winter fluxes play an important role in the annual CO2 balance of Arctic tundra ecosystems. However, flux measurements were not available at TVC and DL1 during the cold season. Thus, the process-based ecosystem model CLASSIC (the Canadian Land Surface Scheme including biogeochemical Cycles, formerly CLASS-CTEM) was used to simulate year-round fluxes. In order to represent the Arctic shrub tundra better, shrub and sedge plant functional types were included in CLASSIC and results were evaluated using measurements at DL1. Preliminary results indicate that cold season CO2 losses are substantial and may exceed the growing season CO2 uptake at DL1 during 2010-2017. The joint use of observations and models is valuable in order to better constrain the Arctic CO2 balance. Conference Object Arctic Arctic permafrost Tundra Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Daring Lake ENVELOPE(-111.635,-111.635,64.834,64.834) Trail Valley Creek ENVELOPE(-133.415,-133.415,68.772,68.772) Valley Creek ENVELOPE(-138.324,-138.324,63.326,63.326) |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Four years of growing season eddy covariance measurements of net carbon dioxide (CO2) and energy fluxes were used to examine the similarities/differences in surface-atmosphere interactions at two dwarf shrub tundra sites within Canada’s Southern Arctic ecozone, separated by approximately 1000 km. Both sites, Trail Valley Creek (TVC) and Daring Lake (DL1), are characterised by similar climate (with some differences in radiation due to latitudinal differences), vegetation composition and structure, and are underlain by continuous permafrost, but differ in their soil characteristics. Total atmospheric heating (the sum of latent and sensible heat fluxes) was similar at the two sites. However, at DL1, where the surface organic layer was thinner and mineral soil coarser in texture, latent heat fluxes were greater, sensible heat fluxes were lower, soils were warmer and the active layer thicker. At TVC, cooler soils likely kept ecosystem respiration relatively low despite similar total growing season productivity. As a result, the 4-year mean net growing season ecosystem CO2 uptake (May 1 - September 30) was almost twice as large at TVC (64 ± 19 g C m-2) compared to DL1 (33 ± 11 g C m-2). These results highlight that soil and thaw characteristics are important to understand variability in surface-atmosphere interactions among tundra ecosystems. As recent studies have shown, winter fluxes play an important role in the annual CO2 balance of Arctic tundra ecosystems. However, flux measurements were not available at TVC and DL1 during the cold season. Thus, the process-based ecosystem model CLASSIC (the Canadian Land Surface Scheme including biogeochemical Cycles, formerly CLASS-CTEM) was used to simulate year-round fluxes. In order to represent the Arctic shrub tundra better, shrub and sedge plant functional types were included in CLASSIC and results were evaluated using measurements at DL1. Preliminary results indicate that cold season CO2 losses are substantial and may exceed the growing season CO2 uptake at DL1 during 2010-2017. The joint use of observations and models is valuable in order to better constrain the Arctic CO2 balance. |
format |
Conference Object |
author |
Meyer, Gesa Humphreys, Elyn Melton, Joe R. Lafleur, Peter Marsh, Philip Detto, Matteo Helbig, Manuel Boike, Julia Voigt, Carolina Sonnentag, O. |
spellingShingle |
Meyer, Gesa Humphreys, Elyn Melton, Joe R. Lafleur, Peter Marsh, Philip Detto, Matteo Helbig, Manuel Boike, Julia Voigt, Carolina Sonnentag, O. The role of soil characteristics on measured and modelled carbon dioxide and energy fluxes for Arctic dwarf shrub tundra sites |
author_facet |
Meyer, Gesa Humphreys, Elyn Melton, Joe R. Lafleur, Peter Marsh, Philip Detto, Matteo Helbig, Manuel Boike, Julia Voigt, Carolina Sonnentag, O. |
author_sort |
Meyer, Gesa |
title |
The role of soil characteristics on measured and modelled carbon dioxide and energy fluxes for Arctic dwarf shrub tundra sites |
title_short |
The role of soil characteristics on measured and modelled carbon dioxide and energy fluxes for Arctic dwarf shrub tundra sites |
title_full |
The role of soil characteristics on measured and modelled carbon dioxide and energy fluxes for Arctic dwarf shrub tundra sites |
title_fullStr |
The role of soil characteristics on measured and modelled carbon dioxide and energy fluxes for Arctic dwarf shrub tundra sites |
title_full_unstemmed |
The role of soil characteristics on measured and modelled carbon dioxide and energy fluxes for Arctic dwarf shrub tundra sites |
title_sort |
role of soil characteristics on measured and modelled carbon dioxide and energy fluxes for arctic dwarf shrub tundra sites |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/52022/ https://hdl.handle.net/10013/epic.d42393da-4a4c-4446-9f10-80d812082796 |
long_lat |
ENVELOPE(-111.635,-111.635,64.834,64.834) ENVELOPE(-133.415,-133.415,68.772,68.772) ENVELOPE(-138.324,-138.324,63.326,63.326) |
geographic |
Arctic Daring Lake Trail Valley Creek Valley Creek |
geographic_facet |
Arctic Daring Lake Trail Valley Creek Valley Creek |
genre |
Arctic Arctic permafrost Tundra |
genre_facet |
Arctic Arctic permafrost Tundra |
op_source |
EPIC3EGU General Assembly 2020, 2020-05-04-2020-05-08 |
op_relation |
Meyer, G. , Humphreys, E. , Melton, J. R. , Lafleur, P. , Marsh, P. , Detto, M. , Helbig, M. , Boike, J. orcid:0000-0002-5875-2112 , Voigt, C. and Sonnentag, O. (2020) The role of soil characteristics on measured and modelled carbon dioxide and energy fluxes for Arctic dwarf shrub tundra sites , EGU General Assembly 2020, 4 May 2020 - 8 May 2020 . doi:10.5194/egusphere-egu2020-11913 <https://doi.org/10.5194/egusphere-egu2020-11913> , hdl:10013/epic.d42393da-4a4c-4446-9f10-80d812082796 |
op_doi |
https://doi.org/10.5194/egusphere-egu2020-11913 |
_version_ |
1766301474871050240 |