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Importance of water temperature and thermal stratification dynamics for temporal variation of surface water CO2 in a boreal lake
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap.
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap.
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap.
Responsible organisation
2010 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 115, no G02024, 10PP- p.Article in journal (Refereed) Published
Abstract [en]

Variation of the surface water CO2 concentration is likely to be the result of biological activity and physical processes as water mixing and gas exchange with the atmosphere. Here we have studied the variations in surface water CO2 during the ice-free period in the humic Lake Merasjärvi in northern Sweden. Meteorological, hydrological and limnological data were collected using data logging equipment permitting high time-resolution. The surface water of the lake was supersaturated with respect to CO2 throughout the study period. There were, however, considerable diurnal and longer-term temporal variations of the surface water CO2 concentrations. Partial least squares (PLS) models were used to link the logged CO2 data to the multivariate dataset. On the longer-term time scale (analyzed with 24h means of the logged data) high concentrations of surface water CO2 were best related to the depth and temperature of the upper warmer layer (epilimnion), and to erosion of the underlying colder layer (hypolimnion). The diurnal variation (analyzed with 30 minute means of the logged data) was best related to the thermal dynamics within the epilimnion, which regulated the surface water access to CO2 stores within this layer. Variables related to CO2 emission and photosynthesis (wind and PAR), showed only weak correlations to variations of the surface water CO2 concentration. Accordingly, the CO2 flux, measured with the eddy-covariance technique, was not correlated to the surface water CO2 concentration.

Place, publisher, year, edition, pages
2010. Vol. 115, no G02024, 10PP- p.
Keyword [en]
lake, carbon dioxide, PLS, thermal stratification, boreal
National Category
Earth and Related Environmental Sciences
Research subject
Physical Geography
Identifiers
URN: urn:nbn:se:polar:diva-3767DOI: 10.1029/2009JG001085ISI: 000279310300001OAI: oai:DiVA.org:polar-3767DiVA: diva2:1133343
Available from: 2009-11-04 Created: 2017-08-15

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  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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