In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim\, Tasmania\, Australia,1982-1993 (DB1014)
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 preponde...
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Environmental System Science Data Infrastructure for a Virtual Ecosystem; Carbon Dioxide Information Analysis Center (CDIAC), Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (USA); CSIRO Division of Atmospheric Research, Australia
1998
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Online Access: | https://dx.doi.org/10.3334/cdiac/atg.db1014 https://www.osti.gov/servlets/purl/1389378/ |
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ftdatacite:10.3334/cdiac/atg.db1014 2023-05-15T18:25:49+02:00 In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim\, Tasmania\, Australia,1982-1993 (DB1014) Francey, R. Allison, C. 1998 https://dx.doi.org/10.3334/cdiac/atg.db1014 https://www.osti.gov/servlets/purl/1389378/ en eng Environmental System Science Data Infrastructure for a Virtual Ecosystem; Carbon Dioxide Information Analysis Center (CDIAC), Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (USA); CSIRO Division of Atmospheric Research, Australia 54 ENVIRONMENTAL SCIENCES dataset Numeric Data Dataset 1998 ftdatacite https://doi.org/10.3334/cdiac/atg.db1014 2021-11-05T12:55:41Z 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. Dataset Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Grim ENVELOPE(-64.486,-64.486,-65.379,-65.379) Southern Ocean |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Francey, R. Allison, C. In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim\, Tasmania\, Australia,1982-1993 (DB1014) |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
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. |
format |
Dataset |
author |
Francey, R. Allison, C. |
author_facet |
Francey, R. Allison, C. |
author_sort |
Francey, R. |
title |
In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim\, Tasmania\, Australia,1982-1993 (DB1014) |
title_short |
In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim\, Tasmania\, Australia,1982-1993 (DB1014) |
title_full |
In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim\, Tasmania\, Australia,1982-1993 (DB1014) |
title_fullStr |
In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim\, Tasmania\, Australia,1982-1993 (DB1014) |
title_full_unstemmed |
In situ Carbon 13 and Oxygen 18 Ratios of Atmospheric CO2 from Cape Grim\, Tasmania\, Australia,1982-1993 (DB1014) |
title_sort |
in situ carbon 13 and oxygen 18 ratios of atmospheric co2 from cape grim\, tasmania\, australia,1982-1993 (db1014) |
publisher |
Environmental System Science Data Infrastructure for a Virtual Ecosystem; Carbon Dioxide Information Analysis Center (CDIAC), Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (USA); CSIRO Division of Atmospheric Research, Australia |
publishDate |
1998 |
url |
https://dx.doi.org/10.3334/cdiac/atg.db1014 https://www.osti.gov/servlets/purl/1389378/ |
long_lat |
ENVELOPE(-64.486,-64.486,-65.379,-65.379) |
geographic |
Grim Southern Ocean |
geographic_facet |
Grim Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_doi |
https://doi.org/10.3334/cdiac/atg.db1014 |
_version_ |
1766207492621074432 |