Effects of active layer seasonal dynamics and plant phenology on CO2 land-atmosphere fluxes at polygonal tundra in the High Arctic, Svalbard
Terrestrial Arctic ecosystems play a key role in the global carbon (C) cycle, as they store a large amount of organic matter in permafrost. Among regions with continuous permafrost, Svalbard has one of the warmest permafrost and may provide a template of the environmental responses of Arctic regions...
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Online Access: | http://hdl.handle.net/11383/2077467 https://doi.org/10.1016/j.catena.2018.11.013 |
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ftuninsubriairis:oai:irinsubria.uninsubria.it:11383/2077467 2024-04-14T08:00:17+00:00 Effects of active layer seasonal dynamics and plant phenology on CO2 land-atmosphere fluxes at polygonal tundra in the High Arctic, Svalbard Cannone, N. Ponti, S. Christiansen, H. H. Christensen, T. R. Pirk, N. Guglielmin, M. Cannone, N. Ponti, S. Christiansen, H. H. Christensen, T. R. Pirk, N. Guglielmin, M. 2019 http://hdl.handle.net/11383/2077467 https://doi.org/10.1016/j.catena.2018.11.013 eng eng ELSEVIER SCIENCE BV country:AMSTERDAM info:eu-repo/semantics/altIdentifier/wos/WOS:000456754600013 volume:174 firstpage:142 lastpage:153 numberofpages:12 journal:CATENA http://hdl.handle.net/11383/2077467 doi:10.1016/j.catena.2018.11.013 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85056622924 www.elsevier.com/inca/publications/store/5/2/4/6/0/9 Climate change Continuous permafrost Plant phenology Seasonal change Soil hydrology Thaw depth info:eu-repo/semantics/article 2019 ftuninsubriairis https://doi.org/10.1016/j.catena.2018.11.013 2024-03-21T19:05:14Z Terrestrial Arctic ecosystems play a key role in the global carbon (C) cycle, as they store a large amount of organic matter in permafrost. Among regions with continuous permafrost, Svalbard has one of the warmest permafrost and may provide a template of the environmental responses of Arctic regions to future climate change.We analyze the CO2 fluxes at a polygonal tundra site in Adventdalen (Svalbard) during one full growing season across a vegetation and environmental gradient to understand how the interaction of different abiotic (thaw depth, ground surface temperature (GST), soil moisture, photosynthetic active radiation - PAR) and biotic (leaf area index (LAI), and plant phenology) factors affect the CO2 fluxes and identify the drivers of Net Ecosystem Exchange (NEE) and Ecosystem Respiration (ER).Three distinct periods (early, peak, and late) characterized the growing season based on plant phenology and the main environmental conditions. Comparing early, peak and late season, both NEE and ER exhibited specific patterns: ER shown high values since the early season, only slightly increased at peak, and then decreased drastically in the late season, with GST being the most important driver of ER. The drivers of NEE changed during the season: thaw depth, PAR and GST during the early season, LAI at peak, and PAR during the late season. These data allow to highlight that the thawing and freezing of the upper part of the active layer during the early and late season controls ER, possibly due to the response of microbial respiration in the upper part of the soil. Especially during the late season, despite the fully developed active layer (reaching its highest thawing depth), the freezing of the uppermost 2 cm of soil induced the drastic decrease of the respiratory efflux. In addition, the seasonal C balance of our plots indicated a seasonal source at our plots, in apparent contrast with previous eddy covariance (EC) measurements from a wetter area nearby. This difference implies that drier ecosystems act as sources ... Article in Journal/Newspaper Adventdalen Arctic Climate change permafrost Svalbard Tundra IRInSubria - Institutional Repository Insubria (Università degli Studi dell’Insubria) Arctic Svalbard Adventdalen ENVELOPE(16.264,16.264,78.181,78.181) CATENA 174 142 153 |
institution |
Open Polar |
collection |
IRInSubria - Institutional Repository Insubria (Università degli Studi dell’Insubria) |
op_collection_id |
ftuninsubriairis |
language |
English |
topic |
Climate change Continuous permafrost Plant phenology Seasonal change Soil hydrology Thaw depth |
spellingShingle |
Climate change Continuous permafrost Plant phenology Seasonal change Soil hydrology Thaw depth Cannone, N. Ponti, S. Christiansen, H. H. Christensen, T. R. Pirk, N. Guglielmin, M. Effects of active layer seasonal dynamics and plant phenology on CO2 land-atmosphere fluxes at polygonal tundra in the High Arctic, Svalbard |
topic_facet |
Climate change Continuous permafrost Plant phenology Seasonal change Soil hydrology Thaw depth |
description |
Terrestrial Arctic ecosystems play a key role in the global carbon (C) cycle, as they store a large amount of organic matter in permafrost. Among regions with continuous permafrost, Svalbard has one of the warmest permafrost and may provide a template of the environmental responses of Arctic regions to future climate change.We analyze the CO2 fluxes at a polygonal tundra site in Adventdalen (Svalbard) during one full growing season across a vegetation and environmental gradient to understand how the interaction of different abiotic (thaw depth, ground surface temperature (GST), soil moisture, photosynthetic active radiation - PAR) and biotic (leaf area index (LAI), and plant phenology) factors affect the CO2 fluxes and identify the drivers of Net Ecosystem Exchange (NEE) and Ecosystem Respiration (ER).Three distinct periods (early, peak, and late) characterized the growing season based on plant phenology and the main environmental conditions. Comparing early, peak and late season, both NEE and ER exhibited specific patterns: ER shown high values since the early season, only slightly increased at peak, and then decreased drastically in the late season, with GST being the most important driver of ER. The drivers of NEE changed during the season: thaw depth, PAR and GST during the early season, LAI at peak, and PAR during the late season. These data allow to highlight that the thawing and freezing of the upper part of the active layer during the early and late season controls ER, possibly due to the response of microbial respiration in the upper part of the soil. Especially during the late season, despite the fully developed active layer (reaching its highest thawing depth), the freezing of the uppermost 2 cm of soil induced the drastic decrease of the respiratory efflux. In addition, the seasonal C balance of our plots indicated a seasonal source at our plots, in apparent contrast with previous eddy covariance (EC) measurements from a wetter area nearby. This difference implies that drier ecosystems act as sources ... |
author2 |
Cannone, N. Ponti, S. Christiansen, H. H. Christensen, T. R. Pirk, N. Guglielmin, M. |
format |
Article in Journal/Newspaper |
author |
Cannone, N. Ponti, S. Christiansen, H. H. Christensen, T. R. Pirk, N. Guglielmin, M. |
author_facet |
Cannone, N. Ponti, S. Christiansen, H. H. Christensen, T. R. Pirk, N. Guglielmin, M. |
author_sort |
Cannone, N. |
title |
Effects of active layer seasonal dynamics and plant phenology on CO2 land-atmosphere fluxes at polygonal tundra in the High Arctic, Svalbard |
title_short |
Effects of active layer seasonal dynamics and plant phenology on CO2 land-atmosphere fluxes at polygonal tundra in the High Arctic, Svalbard |
title_full |
Effects of active layer seasonal dynamics and plant phenology on CO2 land-atmosphere fluxes at polygonal tundra in the High Arctic, Svalbard |
title_fullStr |
Effects of active layer seasonal dynamics and plant phenology on CO2 land-atmosphere fluxes at polygonal tundra in the High Arctic, Svalbard |
title_full_unstemmed |
Effects of active layer seasonal dynamics and plant phenology on CO2 land-atmosphere fluxes at polygonal tundra in the High Arctic, Svalbard |
title_sort |
effects of active layer seasonal dynamics and plant phenology on co2 land-atmosphere fluxes at polygonal tundra in the high arctic, svalbard |
publisher |
ELSEVIER SCIENCE BV |
publishDate |
2019 |
url |
http://hdl.handle.net/11383/2077467 https://doi.org/10.1016/j.catena.2018.11.013 |
long_lat |
ENVELOPE(16.264,16.264,78.181,78.181) |
geographic |
Arctic Svalbard Adventdalen |
geographic_facet |
Arctic Svalbard Adventdalen |
genre |
Adventdalen Arctic Climate change permafrost Svalbard Tundra |
genre_facet |
Adventdalen Arctic Climate change permafrost Svalbard Tundra |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000456754600013 volume:174 firstpage:142 lastpage:153 numberofpages:12 journal:CATENA http://hdl.handle.net/11383/2077467 doi:10.1016/j.catena.2018.11.013 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85056622924 www.elsevier.com/inca/publications/store/5/2/4/6/0/9 |
op_doi |
https://doi.org/10.1016/j.catena.2018.11.013 |
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