Model-data fusion to assess year-round CO 2 fluxes for an arctic heath ecosystem in West Greenland (69°N)
Quantifying net CO 2 exchange (NEE)of arctic terrestrial ecosystems in response to changes in climatic and environmental conditions is central to understanding ecosystem functioning and assessing potential feedbacks of the carbon cycle to future climate changes. However, annual CO 2 budgets for arct...
Published in: | Agricultural and Forest Meteorology |
---|---|
Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2019
|
Subjects: | |
Online Access: | https://pure.au.dk/portal/da/publications/modeldata-fusion-to-assess-yearround-co-2-fluxes-for-an-arctic-heath-ecosystem-in-west-greenland-69n(02462c4c-23a7-4bce-ae3c-78db81374b3e).html https://doi.org/10.1016/j.agrformet.2019.02.021 http://www.scopus.com/inward/record.url?scp=85064630872&partnerID=8YFLogxK |
id |
ftuniaarhuspubl:oai:pure.atira.dk:publications/02462c4c-23a7-4bce-ae3c-78db81374b3e |
---|---|
record_format |
openpolar |
spelling |
ftuniaarhuspubl:oai:pure.atira.dk:publications/02462c4c-23a7-4bce-ae3c-78db81374b3e 2023-05-15T14:26:31+02:00 Model-data fusion to assess year-round CO 2 fluxes for an arctic heath ecosystem in West Greenland (69°N) Zhang, Wenxin Jansson, Per Erik Sigsgaard, Charlotte McConnell, Alistair Jammet, Mathilde Manon Westergaard-Nielsen, Andreas Lund, Magnus Friborg, Thomas Michelsen, Anders Elberling, Bo 2019 https://pure.au.dk/portal/da/publications/modeldata-fusion-to-assess-yearround-co-2-fluxes-for-an-arctic-heath-ecosystem-in-west-greenland-69n(02462c4c-23a7-4bce-ae3c-78db81374b3e).html https://doi.org/10.1016/j.agrformet.2019.02.021 http://www.scopus.com/inward/record.url?scp=85064630872&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Zhang , W , Jansson , P E , Sigsgaard , C , McConnell , A , Jammet , M M , Westergaard-Nielsen , A , Lund , M , Friborg , T , Michelsen , A & Elberling , B 2019 , ' Model-data fusion to assess year-round CO 2 fluxes for an arctic heath ecosystem in West Greenland (69°N) ' , Agricultural and Forest Meteorology , vol. 272-273 , no. July , pp. 176-186 . https://doi.org/10.1016/j.agrformet.2019.02.021 Arctic tundra Carbon budget CoupModel Eddy covariance Net ecosystem exchange Year-round measurements article 2019 ftuniaarhuspubl https://doi.org/10.1016/j.agrformet.2019.02.021 2021-02-24T23:44:32Z Quantifying net CO 2 exchange (NEE)of arctic terrestrial ecosystems in response to changes in climatic and environmental conditions is central to understanding ecosystem functioning and assessing potential feedbacks of the carbon cycle to future climate changes. However, annual CO 2 budgets for arctic tundra are rare due to the difficulties of performing measurements during non-growing seasons. It is still unclear to what extent arctic tundra ecosystems currently act as a CO 2 source, sink or are in balance. This study presents year-round eddy-covariance (EC)measurements of CO 2 fluxes for an arctic heath ecosystem on Disko Island, West Greenland (69 °N)over five years. Based on a fusion of year-round EC-derived CO 2 fluxes, soil temperature and moisture, the process-oriented model (CoupModel)has been constrained to quantify an annual budget and characterize seasonal patterns of CO 2 fluxes. The results show that total photosynthesis corresponds to -202 ± 20 g C m −2 yr -1 with ecosystem respiration of 167 ± 28 g C m -2 yr -1 , resulting in NEE of -35 ± 15 g C m -2 yr -1 . The respiration loss is mainly described as decomposition of near-surface litter. A year with an anomalously deep snowpack shows a threefold increase in the rate of ecosystem respiration compared to other years. Due to the high CO 2 emissions during that winter, the annual budget results in a marked reduction in the CO 2 sink. The seasonal patterns of photosynthesis and soil respiration were described using response functions of the forcing atmosphere and soil conditions. Snow depth, topography-related soil moisture, and growing season warmth are identified as important environmental characteristics which most influence seasonal rates of gas exchange. Article in Journal/Newspaper Arctic Arctic Greenland Tundra Aarhus University: Research Arctic Greenland Agricultural and Forest Meteorology 272-273 176 186 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Arctic tundra Carbon budget CoupModel Eddy covariance Net ecosystem exchange Year-round measurements |
spellingShingle |
Arctic tundra Carbon budget CoupModel Eddy covariance Net ecosystem exchange Year-round measurements Zhang, Wenxin Jansson, Per Erik Sigsgaard, Charlotte McConnell, Alistair Jammet, Mathilde Manon Westergaard-Nielsen, Andreas Lund, Magnus Friborg, Thomas Michelsen, Anders Elberling, Bo Model-data fusion to assess year-round CO 2 fluxes for an arctic heath ecosystem in West Greenland (69°N) |
topic_facet |
Arctic tundra Carbon budget CoupModel Eddy covariance Net ecosystem exchange Year-round measurements |
description |
Quantifying net CO 2 exchange (NEE)of arctic terrestrial ecosystems in response to changes in climatic and environmental conditions is central to understanding ecosystem functioning and assessing potential feedbacks of the carbon cycle to future climate changes. However, annual CO 2 budgets for arctic tundra are rare due to the difficulties of performing measurements during non-growing seasons. It is still unclear to what extent arctic tundra ecosystems currently act as a CO 2 source, sink or are in balance. This study presents year-round eddy-covariance (EC)measurements of CO 2 fluxes for an arctic heath ecosystem on Disko Island, West Greenland (69 °N)over five years. Based on a fusion of year-round EC-derived CO 2 fluxes, soil temperature and moisture, the process-oriented model (CoupModel)has been constrained to quantify an annual budget and characterize seasonal patterns of CO 2 fluxes. The results show that total photosynthesis corresponds to -202 ± 20 g C m −2 yr -1 with ecosystem respiration of 167 ± 28 g C m -2 yr -1 , resulting in NEE of -35 ± 15 g C m -2 yr -1 . The respiration loss is mainly described as decomposition of near-surface litter. A year with an anomalously deep snowpack shows a threefold increase in the rate of ecosystem respiration compared to other years. Due to the high CO 2 emissions during that winter, the annual budget results in a marked reduction in the CO 2 sink. The seasonal patterns of photosynthesis and soil respiration were described using response functions of the forcing atmosphere and soil conditions. Snow depth, topography-related soil moisture, and growing season warmth are identified as important environmental characteristics which most influence seasonal rates of gas exchange. |
format |
Article in Journal/Newspaper |
author |
Zhang, Wenxin Jansson, Per Erik Sigsgaard, Charlotte McConnell, Alistair Jammet, Mathilde Manon Westergaard-Nielsen, Andreas Lund, Magnus Friborg, Thomas Michelsen, Anders Elberling, Bo |
author_facet |
Zhang, Wenxin Jansson, Per Erik Sigsgaard, Charlotte McConnell, Alistair Jammet, Mathilde Manon Westergaard-Nielsen, Andreas Lund, Magnus Friborg, Thomas Michelsen, Anders Elberling, Bo |
author_sort |
Zhang, Wenxin |
title |
Model-data fusion to assess year-round CO 2 fluxes for an arctic heath ecosystem in West Greenland (69°N) |
title_short |
Model-data fusion to assess year-round CO 2 fluxes for an arctic heath ecosystem in West Greenland (69°N) |
title_full |
Model-data fusion to assess year-round CO 2 fluxes for an arctic heath ecosystem in West Greenland (69°N) |
title_fullStr |
Model-data fusion to assess year-round CO 2 fluxes for an arctic heath ecosystem in West Greenland (69°N) |
title_full_unstemmed |
Model-data fusion to assess year-round CO 2 fluxes for an arctic heath ecosystem in West Greenland (69°N) |
title_sort |
model-data fusion to assess year-round co 2 fluxes for an arctic heath ecosystem in west greenland (69°n) |
publishDate |
2019 |
url |
https://pure.au.dk/portal/da/publications/modeldata-fusion-to-assess-yearround-co-2-fluxes-for-an-arctic-heath-ecosystem-in-west-greenland-69n(02462c4c-23a7-4bce-ae3c-78db81374b3e).html https://doi.org/10.1016/j.agrformet.2019.02.021 http://www.scopus.com/inward/record.url?scp=85064630872&partnerID=8YFLogxK |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic Greenland Tundra |
genre_facet |
Arctic Arctic Greenland Tundra |
op_source |
Zhang , W , Jansson , P E , Sigsgaard , C , McConnell , A , Jammet , M M , Westergaard-Nielsen , A , Lund , M , Friborg , T , Michelsen , A & Elberling , B 2019 , ' Model-data fusion to assess year-round CO 2 fluxes for an arctic heath ecosystem in West Greenland (69°N) ' , Agricultural and Forest Meteorology , vol. 272-273 , no. July , pp. 176-186 . https://doi.org/10.1016/j.agrformet.2019.02.021 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.agrformet.2019.02.021 |
container_title |
Agricultural and Forest Meteorology |
container_volume |
272-273 |
container_start_page |
176 |
op_container_end_page |
186 |
_version_ |
1766299095832461312 |