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Title: In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim\, Tasmania\, Australia,1982-1993 (DB1014)

Abstract

Since 1982, a continuous program of sampling atmospheric CO2 to determine stable isotope ratios has been maintained at the Australian Baseline Air Pollution Station, Cape Grim, Tasmania (40°, 40'56"S, 144°, 41'18"E). The process of in situ extraction of CO2 from air, the preponderance of samples collected in conditions of strong wind from the marine boundary layer of the Southern Ocean, and the determination of all isotope ratios relative to a common high purity CO2 reference gas with isotopic δ13C close to atmospheric values, are a unique combination of factors with respect to obtaining a globally representative signal from a surface site. Air samples are collected during baseline condition episodes at a frequency of around one sample per week. Baseline conditions are characterized by wind direction in the sector 190°-280°, condensation nucleus concentration below 600 per cm-3, and steady continuous CO2 concentrations (variation ± 0.2 ppmv per hour). A vacuum pump draws air from either the 10 m or 70 m intakes and sampling alternates between the two intakes. The air from the intake is dried with a trap immersed in an alcohol bath at about -80°C. Mass spectrometer analyses for δ13C and δ18O are carried out by CSIRO's Division ofmore » Atmospheric Research in Aspendale, usually one to three weeks following collection. This record is possibly the most accurate representation of global atmospheric 13C behavior over the last decade and may be used to partition the uptake of fossil-fuel carbon emissions between ocean and terrestrial plant reservoirs. Using these data, Francey et al. (1995) observed a gradual decrease in δ13C from 1982 to 1993, but with a pronounced flattening from 1988 to 1990; a trend that appears to involve the terrestrial carbon cycle.« less

Authors:
;
  1. CSIRO Division of Atmospheric Research, Mordialloc, Victoria, Australia
Publication Date:
Other Number(s):
DB1014
Product Type:
Dataset
Research Org.:
Environmental System Science Data Infrastructure for a Virtual Ecosystem (ESS-DIVE) (United States); Carbon Dioxide Information Analysis Center (CDIAC), Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (USA); CSIRO Division of Atmospheric Research, Australia
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Subject:
54 ENVIRONMENTAL SCIENCES
OSTI Identifier:
1389378
DOI:
https://doi.org/10.3334/CDIAC/ATG.DB1014

Citation Formats

Francey, R. J., and Allison, C. E. In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim\, Tasmania\, Australia,1982-1993 (DB1014). United States: N. p., 1998. Web. doi:10.3334/CDIAC/ATG.DB1014.
Francey, R. J., & Allison, C. E. In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim\, Tasmania\, Australia,1982-1993 (DB1014). United States. doi:https://doi.org/10.3334/CDIAC/ATG.DB1014
Francey, R. J., and Allison, C. E. 1998. "In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim\, Tasmania\, Australia,1982-1993 (DB1014)". United States. doi:https://doi.org/10.3334/CDIAC/ATG.DB1014. https://www.osti.gov/servlets/purl/1389378. Pub date:Thu Jan 01 00:00:00 EST 1998
@article{osti_1389378,
title = {In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim\, Tasmania\, Australia,1982-1993 (DB1014)},
author = {Francey, R. J. and Allison, C. E.},
abstractNote = {Since 1982, a continuous program of sampling atmospheric CO2 to determine stable isotope ratios has been maintained at the Australian Baseline Air Pollution Station, Cape Grim, Tasmania (40°, 40'56"S, 144°, 41'18"E). The process of in situ extraction of CO2 from air, the preponderance of samples collected in conditions of strong wind from the marine boundary layer of the Southern Ocean, and the determination of all isotope ratios relative to a common high purity CO2 reference gas with isotopic δ13C close to atmospheric values, are a unique combination of factors with respect to obtaining a globally representative signal from a surface site. Air samples are collected during baseline condition episodes at a frequency of around one sample per week. Baseline conditions are characterized by wind direction in the sector 190°-280°, condensation nucleus concentration below 600 per cm-3, and steady continuous CO2 concentrations (variation ± 0.2 ppmv per hour). A vacuum pump draws air from either the 10 m or 70 m intakes and sampling alternates between the two intakes. The air from the intake is dried with a trap immersed in an alcohol bath at about -80°C. Mass spectrometer analyses for δ13C and δ18O are carried out by CSIRO's Division of Atmospheric Research in Aspendale, usually one to three weeks following collection. This record is possibly the most accurate representation of global atmospheric 13C behavior over the last decade and may be used to partition the uptake of fossil-fuel carbon emissions between ocean and terrestrial plant reservoirs. Using these data, Francey et al. (1995) observed a gradual decrease in δ13C from 1982 to 1993, but with a pronounced flattening from 1988 to 1990; a trend that appears to involve the terrestrial carbon cycle.},
doi = {10.3334/CDIAC/ATG.DB1014},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}