Advanced

Estimates of regional surface carbon dioxide exchange and carbon and oxygen isotope discrimination during photosynthesis from concentration profiles in the atmospheric boundary layer

Styles, JM; Lloyd, J; Zolothukin, D; Lawton, KA; Francey, RJ; Arneth, Almut LU ; Salamakho, D; Kolle, O and Schulze, ED (2002) In Tellus, Series B: Chemical and Physical Meteorology. 54B(5). p.768-783
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
in
Tellus, Series B: Chemical and Physical Meteorology.
volume
54B
issue
5
pages
768 - 783
publisher
Taylor & Francis
external identifiers
  • scopus:0036871433
ISSN
0280-6509
DOI
10.1034/j.1600-0889.2002.01336.x
language
English
LU publication?
no
id
0d9257a0-877c-4fbb-8244-586e77357bab (old id 590145)
date added to LUP
2007-11-14 15:17:43
date last changed
2017-07-30 04:31:02
@article{0d9257a0-877c-4fbb-8244-586e77357bab,
  abstract     = {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.},
  author       = {Styles, JM and Lloyd, J and Zolothukin, D and Lawton, KA and Francey, RJ and Arneth, Almut and Salamakho, D and Kolle, O and Schulze, ED},
  issn         = {0280-6509},
  language     = {eng},
  number       = {5},
  pages        = {768--783},
  publisher    = {Taylor & Francis},
  series       = {Tellus, Series B: Chemical and Physical Meteorology.},
  title        = {Estimates of regional surface carbon dioxide exchange and carbon and oxygen isotope discrimination during photosynthesis from concentration profiles in the atmospheric boundary layer},
  url          = {http://dx.doi.org/10.1034/j.1600-0889.2002.01336.x},
  volume       = {54B},
  year         = {2002},
}