Estimates of regional surface carbon dioxide exchange and carbon and oxygen isotope discrimination during photosynthesis from concentration profiles in the atmospheric boundary layer
Corresponding Author
JULIE M. STYLES
CRC for Greenhouse Accounting and Environmental Biology Group, Research School of Biological Sciences, Institute of Advanced Studies, Australian National University, Canberra ACT 0200, Australia
Max-Planck-Institut für Biogeochemie, Postfach 100164, Jena 07701, Germany
*Corresponding author. e-mail: [email protected]
Current address: Department of Forest Science, Oregon State University, 321 Richardson Hall, Corvallis, Oregon 97331-5752, USA.
Search for more papers by this authorJON LLOYD
Max-Planck-Institut für Biogeochemie, Postfach 100164, Jena 07701, Germany
Search for more papers by this authorDANIIL ZOLOTUKHIN
V.N. Sukachev Forest Institute, Siberian Division, Russian Academy of Science, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Search for more papers by this authorKIERAN A. LAWTON
Max-Planck-Institut für Biogeochemie, Postfach 100164, Jena 07701, Germany
Search for more papers by this authorNADJA TCHEBAKOVA
V.N. Sukachev Forest Institute, Siberian Division, Russian Academy of Science, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Search for more papers by this authorROGER J. FRANCEY
CSIRO Division of Atmospheric Research, Private Bag No.1, Aspendale, VIC 3195 Australia
Search for more papers by this authorALMUT ARNETH
Max-Planck-Institut für Biogeochemie, Postfach 100164, Jena 07701, Germany
Landcare Research, Manaaki Whenua, PO Box 69, Lincoln, New Zealand
Search for more papers by this authorDIMA SALAMAKHO
V.N. Sukachev Forest Institute, Siberian Division, Russian Academy of Science, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Search for more papers by this authorOLAF KOLLE
Max-Planck-Institut für Biogeochemie, Postfach 100164, Jena 07701, Germany
Search for more papers by this authorE.-DETLEF SCHULZE
Max-Planck-Institut für Biogeochemie, Postfach 100164, Jena 07701, Germany
Search for more papers by this authorCorresponding Author
JULIE M. STYLES
CRC for Greenhouse Accounting and Environmental Biology Group, Research School of Biological Sciences, Institute of Advanced Studies, Australian National University, Canberra ACT 0200, Australia
Max-Planck-Institut für Biogeochemie, Postfach 100164, Jena 07701, Germany
*Corresponding author. e-mail: [email protected]
Current address: Department of Forest Science, Oregon State University, 321 Richardson Hall, Corvallis, Oregon 97331-5752, USA.
Search for more papers by this authorJON LLOYD
Max-Planck-Institut für Biogeochemie, Postfach 100164, Jena 07701, Germany
Search for more papers by this authorDANIIL ZOLOTUKHIN
V.N. Sukachev Forest Institute, Siberian Division, Russian Academy of Science, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Search for more papers by this authorKIERAN A. LAWTON
Max-Planck-Institut für Biogeochemie, Postfach 100164, Jena 07701, Germany
Search for more papers by this authorNADJA TCHEBAKOVA
V.N. Sukachev Forest Institute, Siberian Division, Russian Academy of Science, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Search for more papers by this authorROGER J. FRANCEY
CSIRO Division of Atmospheric Research, Private Bag No.1, Aspendale, VIC 3195 Australia
Search for more papers by this authorALMUT ARNETH
Max-Planck-Institut für Biogeochemie, Postfach 100164, Jena 07701, Germany
Landcare Research, Manaaki Whenua, PO Box 69, Lincoln, New Zealand
Search for more papers by this authorDIMA SALAMAKHO
V.N. Sukachev Forest Institute, Siberian Division, Russian Academy of Science, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Search for more papers by this authorOLAF KOLLE
Max-Planck-Institut für Biogeochemie, Postfach 100164, Jena 07701, Germany
Search for more papers by this authorE.-DETLEF SCHULZE
Max-Planck-Institut für Biogeochemie, Postfach 100164, Jena 07701, Germany
Search for more papers by this authorabstract
The integrating properties of the atmospheric boundary layer allow the influence of surface exchange processes on the atmosphere to be quantified and estimates of large-scale fluxes of trace gases and plant isotopic discrimination to be made. Five flights were undertaken over two days in and above the convective boundary layer (CBL) in a vegetated region in central Siberia. Vertical profiles of CO2 and H2O concentrations, temperature and pressure were obtained during each flight. Air flask samples were taken at various heights for carbon and oxygen isotopic analysis of CO2. Two CBL budget methods were compared to estimate regional surface fluxes of CO2 and plant isotopic discrimination against 13CO2 and C18O16O. Flux estimates were compared to ground-based eddy covariance measurements. The fluxes obtained for CO2 using the first method agreed to within 10% of fluxes measured in the forest at the study site by eddy covariance. Those obtained from the second method agreed to within 35% when a correction was applied for air loss out of the integrating column and for subsidence. The values for 13C discrimination were within the range expected from knowledge of C3 plant discriminations during photosynthesis, while the inferred 18O discrimination varied considerably over the two-day period. This variation may in part be explained by the enrichment of chloroplast water during the day due to evaporation from an initial signature in the morning close to source water. Additional potential complications arising from the heterogeneous nature of the landscape are discussed.
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