Modelling the interannual variability of net ecosystem CO 2 exchange at a subarctic sedge fen
Abstract This paper presents an empirical model of net ecosystem CO 2 exchange (NEE) developed for a subarctic fen near Churchill, Manitoba. The model with observed data helps explain the interannual variability in growing season NEE. Five years of tower‐flux data are used to test and examine the se...
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crwiley:10.1046/j.1354-1013.2001.00403.x 2024-06-02T08:05:22+00:00 Modelling the interannual variability of net ecosystem CO 2 exchange at a subarctic sedge fen Griffis, Timothy J. Rouse, Wayne R. 2001 http://dx.doi.org/10.1046/j.1354-1013.2001.00403.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1354-1013.2001.00403.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1354-1013.2001.00403.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 7, issue 5, page 511-530 ISSN 1354-1013 1365-2486 journal-article 2001 crwiley https://doi.org/10.1046/j.1354-1013.2001.00403.x 2024-05-03T10:53:13Z Abstract This paper presents an empirical model of net ecosystem CO 2 exchange (NEE) developed for a subarctic fen near Churchill, Manitoba. The model with observed data helps explain the interannual variability in growing season NEE. Five years of tower‐flux data are used to test and examine the seasonal behaviour of the model simulations. Processes controlling the observed interannual variability of CO 2 exchange at the fen are examined by exploring the sensitivity of the model to changes in air temperature, precipitation and leaf area index. Results indicate that the sensitivity of NEE to changing environmental controls is complex and varies interannually depending on the initial conditions of the wetland. Changes in air temperature and the timing of precipitation events have a strong influence on NEE, which is largely manifest in gross ecosystem photosynthesis (GEP). Climate change scenarios indicate that warmer air temperatures will increase carbon acquisition during wet years but may act to reduce wetland carbon storage in years that experience a large water deficit early in the growing season. Model simulations for this subarctic sedge fen indicate that carbon acquisition is greatest during wet and warm conditions. This suggests therefore that carbon accumulation was greatest at this subarctic fen during its early developmental stages when hydroclimatic conditions were relatively wet and warm at approximately 2500 years before present. Article in Journal/Newspaper Churchill Subarctic Wiley Online Library Global Change Biology 7 5 511 530 |
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Open Polar |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract This paper presents an empirical model of net ecosystem CO 2 exchange (NEE) developed for a subarctic fen near Churchill, Manitoba. The model with observed data helps explain the interannual variability in growing season NEE. Five years of tower‐flux data are used to test and examine the seasonal behaviour of the model simulations. Processes controlling the observed interannual variability of CO 2 exchange at the fen are examined by exploring the sensitivity of the model to changes in air temperature, precipitation and leaf area index. Results indicate that the sensitivity of NEE to changing environmental controls is complex and varies interannually depending on the initial conditions of the wetland. Changes in air temperature and the timing of precipitation events have a strong influence on NEE, which is largely manifest in gross ecosystem photosynthesis (GEP). Climate change scenarios indicate that warmer air temperatures will increase carbon acquisition during wet years but may act to reduce wetland carbon storage in years that experience a large water deficit early in the growing season. Model simulations for this subarctic sedge fen indicate that carbon acquisition is greatest during wet and warm conditions. This suggests therefore that carbon accumulation was greatest at this subarctic fen during its early developmental stages when hydroclimatic conditions were relatively wet and warm at approximately 2500 years before present. |
format |
Article in Journal/Newspaper |
author |
Griffis, Timothy J. Rouse, Wayne R. |
spellingShingle |
Griffis, Timothy J. Rouse, Wayne R. Modelling the interannual variability of net ecosystem CO 2 exchange at a subarctic sedge fen |
author_facet |
Griffis, Timothy J. Rouse, Wayne R. |
author_sort |
Griffis, Timothy J. |
title |
Modelling the interannual variability of net ecosystem CO 2 exchange at a subarctic sedge fen |
title_short |
Modelling the interannual variability of net ecosystem CO 2 exchange at a subarctic sedge fen |
title_full |
Modelling the interannual variability of net ecosystem CO 2 exchange at a subarctic sedge fen |
title_fullStr |
Modelling the interannual variability of net ecosystem CO 2 exchange at a subarctic sedge fen |
title_full_unstemmed |
Modelling the interannual variability of net ecosystem CO 2 exchange at a subarctic sedge fen |
title_sort |
modelling the interannual variability of net ecosystem co 2 exchange at a subarctic sedge fen |
publisher |
Wiley |
publishDate |
2001 |
url |
http://dx.doi.org/10.1046/j.1354-1013.2001.00403.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1354-1013.2001.00403.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1354-1013.2001.00403.x |
genre |
Churchill Subarctic |
genre_facet |
Churchill Subarctic |
op_source |
Global Change Biology volume 7, issue 5, page 511-530 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1354-1013.2001.00403.x |
container_title |
Global Change Biology |
container_volume |
7 |
container_issue |
5 |
container_start_page |
511 |
op_container_end_page |
530 |
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1800750163562594304 |