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Methane and carbon ...
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Erkkilä, Kukka MaariaUniversity of Helsinki,Univ Helsinki, Finland
(author)
Methane and carbon dioxide fluxes over a lake : Comparison between eddy covariance, floating chambers and boundary layer method
- Article/chapterEnglish2018
Publisher, publication year, extent ...
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2018-01-19
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Copernicus GmbH,2018
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17 s.
Numbers
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LIBRIS-ID:oai:lup.lub.lu.se:588a9b24-7dc2-4c94-8d31-184c565236fe
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https://lup.lub.lu.se/record/588a9b24-7dc2-4c94-8d31-184c565236feURI
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https://doi.org/10.5194/bg-15-429-2018DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-145141URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
Notes
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Funding Agencies|EU project GHG-LAKE [612642]; Academy of Finland (CarLAC project) [281196]; Academy of Finland (Centre of Excellence) [272041]; Academy of Finland (Academy Professor projects) [284701, 282842]; SRC-VR; ERC [725546]; ICOS-FINLAND [281255]
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Freshwaters bring a notable contribution to the global carbon budget by emitting both carbon dioxide (CO2) and methane (CH4) to the atmosphere. Global estimates of freshwater emissions traditionally use a wind-speed-based gas transfer velocity, kCC (introduced by Cole and Caraco, 1998), for calculating diffusive flux with the boundary layer method (BLM). We compared CH4 and CO2 fluxes from BLM with kCC and two other gas transfer velocities (kTE and kHE), which include the effects of water-side cooling to the gas transfer besides shear-induced turbulence, with simultaneous eddy covariance (EC) and floating chamber (FC) fluxes during a 16-day measurement campaign in September 2014 at Lake Kuivajärvi in Finland. The measurements included both lake stratification and water column mixing periods. Results show that BLM fluxes were mainly lower than EC, with the more recent model kTE giving the best fit with EC fluxes, whereas FC measurements resulted in higher fluxes than simultaneous EC measurements. We highly recommend using up-to-date gas transfer models, instead of kCC, for better flux estimates. BLM CO2 flux measurements had clear differences between daytime and night-time fluxes with all gas transfer models during both stratified and mixing periods, whereas EC measurements did not show a diurnal behaviour in CO2 flux. CH4 flux had higher values in daytime than night-time during lake mixing period according to EC measurements, with highest fluxes detected just before sunset. In addition, we found clear differences in daytime and night-time concentration difference between the air and surface water for both CH4 and CO2. This might lead to biased flux estimates, if only daytime values are used in BLM upscaling and flux measurements in general. FC measurements did not detect spatial variation in either CH4 or CO2 flux over Lake Kuivajärvi. EC measurements, on the other hand, did not show any spatial variation in CH4 fluxes but did show a clear difference between CO2 fluxes from shallower and deeper areas. We highlight that while all flux measurement methods have their pros and cons, it is important to carefully think about the chosen method and measurement interval, as well as their effects on the resulting flux.
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Ojala, AnneUniversity of Helsinki,Univ Helsinki, Finland
(author)
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Bastviken, DavidLinköpings universitet,Linköping University,Tema Miljöförändring,Filosofiska fakulteten(Swepub:liu)davba48
(author)
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Biermann, TobiasLund University,Lunds universitet,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science,Lund Univ, Sweden(Swepub:lu)cec-tab
(author)
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Heiskanen, JouniUniversity of Helsinki,Univ Helsinki, Finland
(author)
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Lindroth, AndersLund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science,Lund Univ, Sweden(Swepub:lu)ngeo-ali
(author)
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Peltola, OlliUniversity of Helsinki,Univ Helsinki, Finland
(author)
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Rantakari, MiittaUniversity of Helsinki,Univ Helsinki, Finland; Univ Helsinki, Finland
(author)
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Vesala, TimoUniversity of Helsinki,Univ Helsinki, Finland
(author)
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Mammarella, IvanUniversity of Helsinki,Univ Helsinki, Finland
(author)
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University of HelsinkiUniv Helsinki, Finland
(creator_code:org_t)
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In:Biogeosciences: Copernicus GmbH15:2, s. 429-4451726-41701726-4189
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Erkkilä, Kukka M ...
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Ojala, Anne
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Bastviken, David
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Biermann, Tobias
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Heiskanen, Jouni
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Lindroth, Anders
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Peltola, Olli
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Rantakari, Miitt ...
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Vesala, Timo
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Mammarella, Ivan
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NATURAL SCIENCES
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NATURAL SCIENCES
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Biogeosciences
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