The amount and timing of precipitation control the magnitude, seasonality and sources ( 14 C) of ecosystem respiration in a polar semi-desert, northwestern Greenland
This study investigates how warming and changes in precipitation may affect the cycling of carbon (C) in tundra soils, and between high Arctic tundra and the atmosphere. We quantified ecosystem respiration ( R eco ) and soil pore space CO 2 in a polar semi-desert in northwestern Greenland under curr...
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ftdoajarticles:oai:doaj.org/article:fb033808ddb742ceaf1384e6ff7e3a89 2023-05-15T14:56:49+02:00 The amount and timing of precipitation control the magnitude, seasonality and sources ( 14 C) of ecosystem respiration in a polar semi-desert, northwestern Greenland M. Lupascu J. M. Welker U. Seibt X. Xu I. Velicogna D. S. Lindsey C. I. Czimczik 2014-08-01T00:00:00Z https://doi.org/10.5194/bg-11-4289-2014 https://doaj.org/article/fb033808ddb742ceaf1384e6ff7e3a89 EN eng Copernicus Publications http://www.biogeosciences.net/11/4289/2014/bg-11-4289-2014.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-11-4289-2014 https://doaj.org/article/fb033808ddb742ceaf1384e6ff7e3a89 Biogeosciences, Vol 11, Iss 16, Pp 4289-4304 (2014) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2014 ftdoajarticles https://doi.org/10.5194/bg-11-4289-2014 2022-12-31T11:20:43Z This study investigates how warming and changes in precipitation may affect the cycling of carbon (C) in tundra soils, and between high Arctic tundra and the atmosphere. We quantified ecosystem respiration ( R eco ) and soil pore space CO 2 in a polar semi-desert in northwestern Greenland under current and future climate conditions simulated by long-term experimental warming (+2 °C, +4 °C), water addition (+50% summer precipitation), and a combination of both (+4 °C × +50% summer precipitation). We also measured the 14 C content of R eco and soil CO 2 to distinguish young C cycling rapidly between the atmosphere and the ecosystem from older C stored in the soil for centuries to millennia. We identified changes in the amount and timing of precipitation as a key control of the magnitude, seasonality and sources of R eco in a polar semi-desert. Throughout each summer, small (<4 mm) precipitation events during drier periods triggered the release of very old C pulses from the deep soil, while larger precipitation events (>4 mm), more winter snow and experimental irrigation were associated with higher R eco fluxes and the release of recently fixed (young) C. Warmer summers and experimental warming also resulted in higher R eco fluxes (+2 °C > +4 °C), but coincided with losses of older C. We conclude that in high Arctic, dry tundra systems, future magnitudes and patterns of old C emissions will be controlled as much by the summer precipitation regime and winter snowpack as by warming. The release of older soil C is of concern, as it may lead to net C losses from the ecosystem. Therefore, reliable predictions of precipitation amounts, frequency, and timing are required to predict the changing C cycle in the high Arctic. Article in Journal/Newspaper Arctic Greenland Tundra Directory of Open Access Journals: DOAJ Articles Arctic Greenland Biogeosciences 11 16 4289 4304 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 M. Lupascu J. M. Welker U. Seibt X. Xu I. Velicogna D. S. Lindsey C. I. Czimczik The amount and timing of precipitation control the magnitude, seasonality and sources ( 14 C) of ecosystem respiration in a polar semi-desert, northwestern Greenland |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
This study investigates how warming and changes in precipitation may affect the cycling of carbon (C) in tundra soils, and between high Arctic tundra and the atmosphere. We quantified ecosystem respiration ( R eco ) and soil pore space CO 2 in a polar semi-desert in northwestern Greenland under current and future climate conditions simulated by long-term experimental warming (+2 °C, +4 °C), water addition (+50% summer precipitation), and a combination of both (+4 °C × +50% summer precipitation). We also measured the 14 C content of R eco and soil CO 2 to distinguish young C cycling rapidly between the atmosphere and the ecosystem from older C stored in the soil for centuries to millennia. We identified changes in the amount and timing of precipitation as a key control of the magnitude, seasonality and sources of R eco in a polar semi-desert. Throughout each summer, small (<4 mm) precipitation events during drier periods triggered the release of very old C pulses from the deep soil, while larger precipitation events (>4 mm), more winter snow and experimental irrigation were associated with higher R eco fluxes and the release of recently fixed (young) C. Warmer summers and experimental warming also resulted in higher R eco fluxes (+2 °C > +4 °C), but coincided with losses of older C. We conclude that in high Arctic, dry tundra systems, future magnitudes and patterns of old C emissions will be controlled as much by the summer precipitation regime and winter snowpack as by warming. The release of older soil C is of concern, as it may lead to net C losses from the ecosystem. Therefore, reliable predictions of precipitation amounts, frequency, and timing are required to predict the changing C cycle in the high Arctic. |
format |
Article in Journal/Newspaper |
author |
M. Lupascu J. M. Welker U. Seibt X. Xu I. Velicogna D. S. Lindsey C. I. Czimczik |
author_facet |
M. Lupascu J. M. Welker U. Seibt X. Xu I. Velicogna D. S. Lindsey C. I. Czimczik |
author_sort |
M. Lupascu |
title |
The amount and timing of precipitation control the magnitude, seasonality and sources ( 14 C) of ecosystem respiration in a polar semi-desert, northwestern Greenland |
title_short |
The amount and timing of precipitation control the magnitude, seasonality and sources ( 14 C) of ecosystem respiration in a polar semi-desert, northwestern Greenland |
title_full |
The amount and timing of precipitation control the magnitude, seasonality and sources ( 14 C) of ecosystem respiration in a polar semi-desert, northwestern Greenland |
title_fullStr |
The amount and timing of precipitation control the magnitude, seasonality and sources ( 14 C) of ecosystem respiration in a polar semi-desert, northwestern Greenland |
title_full_unstemmed |
The amount and timing of precipitation control the magnitude, seasonality and sources ( 14 C) of ecosystem respiration in a polar semi-desert, northwestern Greenland |
title_sort |
amount and timing of precipitation control the magnitude, seasonality and sources ( 14 c) of ecosystem respiration in a polar semi-desert, northwestern greenland |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/bg-11-4289-2014 https://doaj.org/article/fb033808ddb742ceaf1384e6ff7e3a89 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Tundra |
genre_facet |
Arctic Greenland Tundra |
op_source |
Biogeosciences, Vol 11, Iss 16, Pp 4289-4304 (2014) |
op_relation |
http://www.biogeosciences.net/11/4289/2014/bg-11-4289-2014.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-11-4289-2014 https://doaj.org/article/fb033808ddb742ceaf1384e6ff7e3a89 |
op_doi |
https://doi.org/10.5194/bg-11-4289-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
16 |
container_start_page |
4289 |
op_container_end_page |
4304 |
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1766328888277860352 |