Ecosystem-atmosphere interactions in the Arctic: using data-model approaches to understand carbon cycle feedbacks
The terrestrial CO2 exchange in the Arctic plays an important role in the global carbon (C) cycle. The Arctic ecosystems, containing a large amount of organic carbon (C), are experiencing ongoing warming in recent decades, which is affecting the C cycling and the feedback interactions between its di...
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Other Authors: | , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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The University of Edinburgh
2018
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Subjects: | |
Online Access: | http://hdl.handle.net/1842/33101 |
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ftunivedinburgh:oai:era.ed.ac.uk:1842/33101 |
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Open Polar |
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Edinburgh Research Archive (ERA - University of Edinburgh) |
op_collection_id |
ftunivedinburgh |
language |
English |
topic |
Greenland Arctic carbon cycle net ecosystem exchange photosynthesis respiration meteorology biological disturbance plant traits observations modelling |
spellingShingle |
Greenland Arctic carbon cycle net ecosystem exchange photosynthesis respiration meteorology biological disturbance plant traits observations modelling López-Blanco, Efrén Ecosystem-atmosphere interactions in the Arctic: using data-model approaches to understand carbon cycle feedbacks |
topic_facet |
Greenland Arctic carbon cycle net ecosystem exchange photosynthesis respiration meteorology biological disturbance plant traits observations modelling |
description |
The terrestrial CO2 exchange in the Arctic plays an important role in the global carbon (C) cycle. The Arctic ecosystems, containing a large amount of organic carbon (C), are experiencing ongoing warming in recent decades, which is affecting the C cycling and the feedback interactions between its different components. To improve our understanding of the atmosphere-ecosystem interactions, the Greenland Ecosystem Monitoring (GEM) program measures ecosystem CO2 exchange and links it to biogeochemical processes. However, this task remains challenging in northern latitudes due to an insufficient number of measurement sites, particularly covering full annual cycles, but also the frequent gaps in data affected by extreme conditions and remoteness. Combining ecosystem models and field observations we are able to study the underlying processes of Arctic CO2 exchange in changing environments. The overall aim of the research is to use data-model approaches to analyse the patterns of C exchange and their links to biological processes in Arctic ecosystems, studied in detail both from a measurement and a modelling perspective, but also from a local to a pan-arctic scale. In Paper I we found a compensatory response of photosynthesis (GPP) and ecosystem respiration (Reco), both highly sensitive to the meteorological drivers (i.e. temperatures and radiation) in Kobbefjord, West Greenland tundra. This tight relationship led to a relatively insensitive net ecosystem exchange (NEE) to the meteorology, despite the large variability in temperature and precipitations across growing seasons. This tundra ecosystem acted as a consistent sink of C (-30 g C m-2), except in 2011 (41 g C m-2), which was associated with a major pest outbreak. In Paper II we estimated this decrease of C sink strength of 118-144 g C m-2 in the anomalous year (2011), corresponding to 1210-1470 tonnes C at the Kobbefjord catchment scale. We concluded that the meteorological sensitivity of photosynthesis and respiration were similar, and hence compensatory, but we ... |
author2 |
Williams, Mathew Christensen, Torben R. Lund, Magnus Tamstorf, Mikkel P. |
format |
Doctoral or Postdoctoral Thesis |
author |
López-Blanco, Efrén |
author_facet |
López-Blanco, Efrén |
author_sort |
López-Blanco, Efrén |
title |
Ecosystem-atmosphere interactions in the Arctic: using data-model approaches to understand carbon cycle feedbacks |
title_short |
Ecosystem-atmosphere interactions in the Arctic: using data-model approaches to understand carbon cycle feedbacks |
title_full |
Ecosystem-atmosphere interactions in the Arctic: using data-model approaches to understand carbon cycle feedbacks |
title_fullStr |
Ecosystem-atmosphere interactions in the Arctic: using data-model approaches to understand carbon cycle feedbacks |
title_full_unstemmed |
Ecosystem-atmosphere interactions in the Arctic: using data-model approaches to understand carbon cycle feedbacks |
title_sort |
ecosystem-atmosphere interactions in the arctic: using data-model approaches to understand carbon cycle feedbacks |
publisher |
The University of Edinburgh |
publishDate |
2018 |
url |
http://hdl.handle.net/1842/33101 |
long_lat |
ENVELOPE(-51.527,-51.527,64.177,64.177) |
geographic |
Arctic Greenland Kobbefjord |
geographic_facet |
Arctic Greenland Kobbefjord |
genre |
Arctic Arctic Greenland Tundra |
genre_facet |
Arctic Arctic Greenland Tundra |
op_relation |
The University of Edinburgh. College of Science and Engineering López-Blanco, E., Lund, M., Williams, M., Tamstorf, M. P., Westergaard- Nielsen, A., Exbrayat, J. F., Hansen, B. U., and Christensen, T. R.: Exchange of CO2 in Arctic tundra: impacts of meteorological variations and biological disturbance, Biogeosciences, 14, 4467- 4483, 10.5194/bg-14-4467-2017, 2017. Lund, M., Raundrup, K., Westergaard-Nielsen, A., López-Blanco, E., Nymand, J., and Aastrup, P.: Larval outbreaks in West Greenland: Instant and subsequent effects on tundra ecosystem productivity and CO2 exchange, AMBIO, 46, 26-38, 10.1007/s13280-016-0863- 9, 2017. López-Blanco, E., Lund, M., Christensen, T. R., Tamstorf, M. P., Smallman, T. L., Slevin, D., Westergaard-Nielsen, A., Hansen, B. U., Abermann, J., and Williams, M.: Plant traits are key determinants in buffering the meteorological sensitivity of net carbon exchanges of arctic tundra, Journal of Geophysical Research – Biogeosciences, 123, https://doi.org/10.1029/2018JG004386, 2018. López-Blanco, E., Exbrayat, J. F., Lund, M., Christensen, T. R., Tamstorf, M. T., Slevin, D., Hugelius, G., Bloom, A. A., and Williams, M.: Evaluation of terrestrial pan-Arctic carbon cycling using a data assimilation system, Earth System Dynamics Discussions, 2018, 1- 27, 10.5194/esd-2018-19, 2018. Pirk, N., Mastepanov, M., López-Blanco, E., Christensen, L. H., Christiansen, H. H., Hansen, B. U., Lund, M., Parmentier, F.-J. W., Skov, K., and Christensen, T. R.: Toward a statistical description of methane emissions from arctic wetlands, AMBIO, 46, 70-80, 10.1007/s13280-016-0893-3, 2017. http://hdl.handle.net/1842/33101 |
op_doi |
https://doi.org/10.5194/bg-14-4467-2017,10.1007/s13280-016-0863-10.1029/2018JG00438610.5194/esd-2018-19,10.1007/s13280-016-0893-3, |
_version_ |
1772810637492092928 |
spelling |
ftunivedinburgh:oai:era.ed.ac.uk:1842/33101 2023-07-30T03:59:57+02:00 Ecosystem-atmosphere interactions in the Arctic: using data-model approaches to understand carbon cycle feedbacks López-Blanco, Efrén Williams, Mathew Christensen, Torben R. Lund, Magnus Tamstorf, Mikkel P. 29/11/2018 application/pdf http://hdl.handle.net/1842/33101 en eng The University of Edinburgh The University of Edinburgh. College of Science and Engineering López-Blanco, E., Lund, M., Williams, M., Tamstorf, M. P., Westergaard- Nielsen, A., Exbrayat, J. F., Hansen, B. U., and Christensen, T. R.: Exchange of CO2 in Arctic tundra: impacts of meteorological variations and biological disturbance, Biogeosciences, 14, 4467- 4483, 10.5194/bg-14-4467-2017, 2017. Lund, M., Raundrup, K., Westergaard-Nielsen, A., López-Blanco, E., Nymand, J., and Aastrup, P.: Larval outbreaks in West Greenland: Instant and subsequent effects on tundra ecosystem productivity and CO2 exchange, AMBIO, 46, 26-38, 10.1007/s13280-016-0863- 9, 2017. López-Blanco, E., Lund, M., Christensen, T. R., Tamstorf, M. P., Smallman, T. L., Slevin, D., Westergaard-Nielsen, A., Hansen, B. U., Abermann, J., and Williams, M.: Plant traits are key determinants in buffering the meteorological sensitivity of net carbon exchanges of arctic tundra, Journal of Geophysical Research – Biogeosciences, 123, https://doi.org/10.1029/2018JG004386, 2018. López-Blanco, E., Exbrayat, J. F., Lund, M., Christensen, T. R., Tamstorf, M. T., Slevin, D., Hugelius, G., Bloom, A. A., and Williams, M.: Evaluation of terrestrial pan-Arctic carbon cycling using a data assimilation system, Earth System Dynamics Discussions, 2018, 1- 27, 10.5194/esd-2018-19, 2018. Pirk, N., Mastepanov, M., López-Blanco, E., Christensen, L. H., Christiansen, H. H., Hansen, B. U., Lund, M., Parmentier, F.-J. W., Skov, K., and Christensen, T. R.: Toward a statistical description of methane emissions from arctic wetlands, AMBIO, 46, 70-80, 10.1007/s13280-016-0893-3, 2017. http://hdl.handle.net/1842/33101 Greenland Arctic carbon cycle net ecosystem exchange photosynthesis respiration meteorology biological disturbance plant traits observations modelling Thesis or Dissertation Doctoral PhD Doctor of Philosophy 2018 ftunivedinburgh https://doi.org/10.5194/bg-14-4467-2017,10.1007/s13280-016-0863-10.1029/2018JG00438610.5194/esd-2018-19,10.1007/s13280-016-0893-3, 2023-07-09T20:31:34Z The terrestrial CO2 exchange in the Arctic plays an important role in the global carbon (C) cycle. The Arctic ecosystems, containing a large amount of organic carbon (C), are experiencing ongoing warming in recent decades, which is affecting the C cycling and the feedback interactions between its different components. To improve our understanding of the atmosphere-ecosystem interactions, the Greenland Ecosystem Monitoring (GEM) program measures ecosystem CO2 exchange and links it to biogeochemical processes. However, this task remains challenging in northern latitudes due to an insufficient number of measurement sites, particularly covering full annual cycles, but also the frequent gaps in data affected by extreme conditions and remoteness. Combining ecosystem models and field observations we are able to study the underlying processes of Arctic CO2 exchange in changing environments. The overall aim of the research is to use data-model approaches to analyse the patterns of C exchange and their links to biological processes in Arctic ecosystems, studied in detail both from a measurement and a modelling perspective, but also from a local to a pan-arctic scale. In Paper I we found a compensatory response of photosynthesis (GPP) and ecosystem respiration (Reco), both highly sensitive to the meteorological drivers (i.e. temperatures and radiation) in Kobbefjord, West Greenland tundra. This tight relationship led to a relatively insensitive net ecosystem exchange (NEE) to the meteorology, despite the large variability in temperature and precipitations across growing seasons. This tundra ecosystem acted as a consistent sink of C (-30 g C m-2), except in 2011 (41 g C m-2), which was associated with a major pest outbreak. In Paper II we estimated this decrease of C sink strength of 118-144 g C m-2 in the anomalous year (2011), corresponding to 1210-1470 tonnes C at the Kobbefjord catchment scale. We concluded that the meteorological sensitivity of photosynthesis and respiration were similar, and hence compensatory, but we ... Doctoral or Postdoctoral Thesis Arctic Arctic Greenland Tundra Edinburgh Research Archive (ERA - University of Edinburgh) Arctic Greenland Kobbefjord ENVELOPE(-51.527,-51.527,64.177,64.177) |