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  • Jonsson, Anders, 1966-, et al. (author)
  • Gas transfer rate and CO2 flux between an unproductive lake and the atmosphere in northern Sweden
  • 2008
  • In: Journal of Geophysical Research. - 2156-2202. ; 113, s. Art.no. G04006-
  • Journal article (peer-reviewed)abstract
    • Measurements of the gas transfer rate of CO2 between lake water and the atmosphere present a critical problem for the understanding of lake ecosystem carbon balances and landscape carbon budgets. We present calculations of the gas transfer rate of CO2 from direct measurements of the CO2 flux using an eddy covariance system and concurrent measurements of the concentration of CO2 in the surface water in a lake in boreal zone of northern Sweden. The measured gas transfer rate was different, and in general larger than, rates obtained with the most commonly used models for prediction of the gas transfer rate in lakes. The normalized gas transfer rate (k(600)EC) was well predicted from the wind speed at 10 m height if data were bin classed into wind classes of 1 m/s for winds above 1 m/s. Unbinned data were also correlated to wind speed but also to water temperature, water temperature/air temperature ratio and to incoming photosynthetic active radiation (PAR). These relationships could reflect effects of both physico-chemical reactions and biological activity.
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  • Tagesson, Torbern, et al. (author)
  • Estimating Net Primary Production of Swedish Forest Landscapes by Combining Mechanistic Modeling and Remote Sensing
  • 2009
  • In: Ambio: a Journal of Human Environment. - 0044-7447. ; 38:6, s. 316-324
  • Journal article (peer-reviewed)abstract
    • The aim of this study was to investigate a combination of satellite images of leaf area index (LAI) with process-based vegetation modeling for the accurate assessment of the carbon balances of Swedish forest ecosystems at the scale of a landscape. Monthly climatologic data were used as inputs in a dynamic vegetation model, the Lund Potsdam Jena-General Ecosystem Simulator. Model estimates of net primary production (NPP) and the fraction of absorbed photosynthetic active radiation were constrained by combining them with satellite-based LAI images using a general light use efficiency (LUE) model and the Beer-Lambert law. LAI estimates were compared with satellite-extrapolated field estimates of LAI, and the results were generally acceptable. NPP estimates directly from the dynamic vegetation model and estimates obtained by combining the model estimates with remote sensing information were, on average, well simulated but too homogeneous among vegetation types when compared with field estimates using forest inventory data.
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  • Result 1-10 of 179
Type of publication
journal article (153)
conference paper (8)
book chapter (7)
doctoral thesis (5)
research review (4)
reports (2)
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Type of content
peer-reviewed (147)
other academic/artistic (16)
pop. science, debate, etc. (16)
Author/Editor
Lindroth, Anders (166)
Mölder, Meelis (35)
Vestin, Patrik (25)
Lagergren, Fredrik (24)
Klemedtsson, Leif, 1 ... (21)
Vesala, T. (14)
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Nilsson, Mats (13)
Weslien, Per, 1963 (13)
Montagnani, Leonardo (12)
Christensen, Torben (12)
Kljun, Natascha (11)
Lund, Magnus (10)
Laurila, T. (10)
Eklundh, Lars (10)
Peichl, Matthias (9)
Aurela, M. (8)
Crill, Patrick (8)
Kutsch, W. (7)
Montagnani, L. (7)
Klemedtsson, Leif (7)
Aurela, Mika (7)
Ottosson Löfvenius, ... (6)
Hellström, Margareta (6)
Holst, Jutta (6)
Arneth, Almut (6)
Reichstein, Markus (6)
Mammarella, I. (6)
Mastepanov, Mikhail (6)
Wohlfahrt, Georg (6)
Desai, Ankur R. (6)
Laurila, Tuomas (6)
Mammarella, Ivan (6)
Langvall, O (6)
Laudon, Hjalmar (5)
Lohila, A. (5)
Tagesson, Torbern (5)
Cai, Zhanzhang (5)
Hari, P (5)
Ciais, Philippe (5)
Papale, Dario (5)
Grönroos, Roland (5)
Ström, Lena (5)
Persson, Tryggve (5)
Lindroth, Anders M. (5)
Aubinet, M. (5)
Heinesch, B. (5)
Rebmann, C. (5)
Cescatti, Alessandro (5)
Heliasz, Michal (5)
Buchmann, Nina (5)
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University
Lund University (154)
Swedish University of Agricultural Sciences (28)
University of Gothenburg (25)
Uppsala University (19)
Stockholm University (8)
Royal Institute of Technology (5)
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Umeå University (4)
Linköping University (2)
Chalmers University of Technology (2)
Luleå University of Technology (1)
University of Gävle (1)
Örebro University (1)
Malmö University (1)
Mid Sweden University (1)
University of Skövde (1)
Karolinska Institutet (1)
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Language
English (157)
Swedish (17)
Latin (4)
Undefined language (1)
Research subject (UKÄ/SCB)
Natural sciences (156)
Agricultural Sciences (22)
Engineering and Technology (4)
Medical and Health Sciences (4)
Humanities (3)
Social Sciences (2)

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