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Biophysical control...
Biophysical controls on CO2 evasion from Arctic inland waters
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- Rocher-Ros, Gerard (författare)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Arcum
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- Giesler, Reiner (preses)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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- Sponseller, Ryan A., Universitetslektor (preses)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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- Bergström, Ann-Kristin, Professor, 1968- (preses)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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- del Giorgio, Paul, Professor (opponent)
- Université du Québec à Montréal, Montréal, Canada.
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(creator_code:org_t)
- ISBN 9789178550753
- Umeå : Umeå University, 2019
- Engelska 32 s.
- Relaterad länk:
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https://umu.diva-por... (primary) (Raw object)
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https://umu.diva-por...
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https://umu.diva-por...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- CO2 evasion to the atmosphere from inland waters is a major component of the global carbon (C) cycle. Yet spatial patterns of CO2 evasion and the sources of C that fuel evasion remain poorly understood. In this thesis, I use detailed measurements of biological and physical drivers of CO2 evasion to assess how C is transformed and evaded from inland waters in the Arctic (Northern Scandinavia and Alaska). I found that lake size was a master variable controlling lake CO2 evasion in an Arctic catchment and that large lakes play a major role at the landscape scale. In stream networks, I found that catchment topography shapes patterns of CO2 evasion by dictating unique domains with high lateral inputs of C, other domains where biological processes were dominant, and domains where physical forces promoted degassing to the atmosphere. Together, these topographically driven domains created a strong spatial heterogeneity that biases regional and global estimates of CO2 evasion. Further, I found that photosynthetic activity in Arctic streams can produce a large change in CO2 concentrations from night to day, and as a result CO2 evasion is up to 45% higher during night than day. The magnitude of the diel change in CO2 was also affected by the turbulence of the stream and photo-chemical production of CO2. Overall, this thesis offers important insights to better understand landscape patterns of CO2 evasion from inland waters, and suggests that stream metabolic processes largely determine the fate of the C delivered from Arctic soils.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Multidisciplinär geovetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geosciences, Multidisciplinary (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
Nyckelord
- Inland waters
- carbon dioxide
- organic carbon
- inorganic carbon
- arctic
- CO2 evasion
- DOC
- DIC
- streams
- metabolism
- oxygen
- Limnology
- limnologi
Publikations- och innehållstyp
- vet (ämneskategori)
- dok (ämneskategori)
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