Abstract
The delta13C value of terrestrial CO{sub 2} fluxes (delta{sub bio}) provides important information for inverse models of CO{sub 2} sources and sinks as well as for studies of vegetation physiology, C3 and C4 vegetation fluxes, and ecosystem carbon residence times. From 2002-2009, we measured atmospheric CO{sub 2} concentration and delta13C-CO{sub 2} at four heights (2 to 60 m) in the U.S. Southern Great Plains (SGP) and computed delta{sub bio} weekly. This region has a fine-scale mix of crops (primarily C3 winter wheat) and C4 pasture grasses. delta{sub bio} had a large and consistent seasonal cycle of 6.8 per mille. Ensemble monthly mean delta{sub bio} ranged from -25.8 +- 0.4 per mille (+-SE) in March to -20.1 +- 0.4 per mille in July. Thus, C{sub 3} vegetation contributed about 80% of ecosystem fluxes in winter-spring and 50% in summer-fall. In contrast, prairie-soil delta13{sub C} values were about -15 indicating that historically the region was dominated by C{sub 4} vegetation and had more positive deltabio values. Based on a land-surface model, isofluxes (deltabio x NEE) in this region have large seasonal amplitude because deltabio and net ecosystem exchange (NEE) covary. Interannual variability in isoflux was driven by variability in NEE. The large
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Torn, Margaret S. (Lawrence Berkeley National Laboratory and UC Berkeley, Berkeley (United States)), e-mail: mstorn@lbl.gov;
Biraud, Sebastien C;
Riley, William J;
[1]
Still, Christopher J;
[2]
Berry, Joe A
[3]
- Lawrence Berkeley National Laboratory, Earth Sciences Division (United States)
- Univ. of California, Santa Barbara, Geography Dept. (United States)
- Carnegie Institution of Washington, Dept. of Global Ecology (United States)
Citation Formats
Torn, Margaret S. (Lawrence Berkeley National Laboratory and UC Berkeley, Berkeley (United States)), e-mail: mstorn@lbl.gov, Biraud, Sebastien C, Riley, William J, Still, Christopher J, and Berry, Joe A.
Seasonal and interannual variability in 13C composition of ecosystem carbon fluxes in the U.S. Southern Great Plains.
Sweden: N. p.,
2011.
Web.
doi:10.1111/J.1600-0889.2010.00519.X.
Torn, Margaret S. (Lawrence Berkeley National Laboratory and UC Berkeley, Berkeley (United States)), e-mail: mstorn@lbl.gov, Biraud, Sebastien C, Riley, William J, Still, Christopher J, & Berry, Joe A.
Seasonal and interannual variability in 13C composition of ecosystem carbon fluxes in the U.S. Southern Great Plains.
Sweden.
https://doi.org/10.1111/J.1600-0889.2010.00519.X
Torn, Margaret S. (Lawrence Berkeley National Laboratory and UC Berkeley, Berkeley (United States)), e-mail: mstorn@lbl.gov, Biraud, Sebastien C, Riley, William J, Still, Christopher J, and Berry, Joe A.
2011.
"Seasonal and interannual variability in 13C composition of ecosystem carbon fluxes in the U.S. Southern Great Plains."
Sweden.
https://doi.org/10.1111/J.1600-0889.2010.00519.X.
@misc{etde_1013195,
title = {Seasonal and interannual variability in 13C composition of ecosystem carbon fluxes in the U.S. Southern Great Plains}
author = {Torn, Margaret S. (Lawrence Berkeley National Laboratory and UC Berkeley, Berkeley (United States)), e-mail: mstorn@lbl.gov, Biraud, Sebastien C, Riley, William J, Still, Christopher J, and Berry, Joe A}
abstractNote = {The delta13C value of terrestrial CO{sub 2} fluxes (delta{sub bio}) provides important information for inverse models of CO{sub 2} sources and sinks as well as for studies of vegetation physiology, C3 and C4 vegetation fluxes, and ecosystem carbon residence times. From 2002-2009, we measured atmospheric CO{sub 2} concentration and delta13C-CO{sub 2} at four heights (2 to 60 m) in the U.S. Southern Great Plains (SGP) and computed delta{sub bio} weekly. This region has a fine-scale mix of crops (primarily C3 winter wheat) and C4 pasture grasses. delta{sub bio} had a large and consistent seasonal cycle of 6.8 per mille. Ensemble monthly mean delta{sub bio} ranged from -25.8 +- 0.4 per mille (+-SE) in March to -20.1 +- 0.4 per mille in July. Thus, C{sub 3} vegetation contributed about 80% of ecosystem fluxes in winter-spring and 50% in summer-fall. In contrast, prairie-soil delta13{sub C} values were about -15 indicating that historically the region was dominated by C{sub 4} vegetation and had more positive deltabio values. Based on a land-surface model, isofluxes (deltabio x NEE) in this region have large seasonal amplitude because deltabio and net ecosystem exchange (NEE) covary. Interannual variability in isoflux was driven by variability in NEE. The large seasonal amplitude in deltabio and isoflux imply that carbon inverse analyses require accurate estimates of land cover and temporally resolved 13CO{sub 2} and CO{sub 2} fluxes}
doi = {10.1111/J.1600-0889.2010.00519.X}
journal = []
issue = {2}
volume = {63B}
place = {Sweden}
year = {2011}
month = {Apr}
}
title = {Seasonal and interannual variability in 13C composition of ecosystem carbon fluxes in the U.S. Southern Great Plains}
author = {Torn, Margaret S. (Lawrence Berkeley National Laboratory and UC Berkeley, Berkeley (United States)), e-mail: mstorn@lbl.gov, Biraud, Sebastien C, Riley, William J, Still, Christopher J, and Berry, Joe A}
abstractNote = {The delta13C value of terrestrial CO{sub 2} fluxes (delta{sub bio}) provides important information for inverse models of CO{sub 2} sources and sinks as well as for studies of vegetation physiology, C3 and C4 vegetation fluxes, and ecosystem carbon residence times. From 2002-2009, we measured atmospheric CO{sub 2} concentration and delta13C-CO{sub 2} at four heights (2 to 60 m) in the U.S. Southern Great Plains (SGP) and computed delta{sub bio} weekly. This region has a fine-scale mix of crops (primarily C3 winter wheat) and C4 pasture grasses. delta{sub bio} had a large and consistent seasonal cycle of 6.8 per mille. Ensemble monthly mean delta{sub bio} ranged from -25.8 +- 0.4 per mille (+-SE) in March to -20.1 +- 0.4 per mille in July. Thus, C{sub 3} vegetation contributed about 80% of ecosystem fluxes in winter-spring and 50% in summer-fall. In contrast, prairie-soil delta13{sub C} values were about -15 indicating that historically the region was dominated by C{sub 4} vegetation and had more positive deltabio values. Based on a land-surface model, isofluxes (deltabio x NEE) in this region have large seasonal amplitude because deltabio and net ecosystem exchange (NEE) covary. Interannual variability in isoflux was driven by variability in NEE. The large seasonal amplitude in deltabio and isoflux imply that carbon inverse analyses require accurate estimates of land cover and temporally resolved 13CO{sub 2} and CO{sub 2} fluxes}
doi = {10.1111/J.1600-0889.2010.00519.X}
journal = []
issue = {2}
volume = {63B}
place = {Sweden}
year = {2011}
month = {Apr}
}