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Title: In Situ delta 13CO2 from Cape Grim, Tasmania, Australia: 1982-1993

Abstract

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 degrees, condensation nucleus concentration below 600 cm3, and steady, continuous CO2 concentrations (variation +/- 0.2 ppmv per hour). The Cape Grim in situ extraction line is based on 3 high-efficiency glass U-tube traps with internal cooling coils. 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 intakes is dried with a trap inmersed in an alcohol bath at a temperature of about -80 degrees C. CO2 is collected in a second trap immersed in liquid nitrogen. A third liquid nitrogen trap guards against oil vapor back-steaming from the vacuum pump. Air flow is maintained for 2 hours, usually during late morning, at 300 mL/min. After this time, the trap holding the CO2 is raised to the alcohol bath temperature, and the CO2 is transferred cryogenically into a 100 mL glass flask for transport to CSIRO's Division of Atmospheric Research in Aspendale.The Cape Grim in situ record is possibly the most accurate representation of global atmospheric deltamore » 13C behavior during the 1980s and 1990s. Changes in delta 13C of atmospheric CO2 are useful in elucidating the relative roles of oceanic and terrestrial uptake of CO2 from fossil fuel emissions. Francey et al. (1995) observed a gradual decrease in delta 13C for Cape Grim for 1982 to 1993, but with a pronounced flattening from 1988 to 1990. Francey et al. (1995) reported the flattening of the trend from 1988 to 1990 appears to involve the terrestrial carbon cycle.« less

Authors:
;
  1. CSIRO, Division of Atmospheric Research
  2. CSIRO , Division of Atmospheric Research
Publication Date:
Other Number(s):
cdiac:TRENDS-OTHER ATMOSPHERIC TRACE GASES
Product Type:
Dataset
Research Org.:
Environmental System Science Data Infrastructure for a Virtual Ecosystem (ESS-DIVE) (United States)
Subject:
54 ENVIRONMENTAL SCIENCES
Keywords:
Atmospheric CO2 concentrations; Atmospheric CO2 Mixing Ratios; in situ; Infrared Gas Analyzer; carbon 13 ratio; oxygen 18 ratio; height; tear; d13C; d18O
OSTI Identifier:
1463812
DOI:
10.15485/1463812

Citation Formats

Francey, R. J., and Allison, C. E. In Situ delta 13CO2 from Cape Grim, Tasmania, Australia: 1982-1993. United States: N. p., 1998. Web. doi:10.15485/1463812.
Francey, R. J., & Allison, C. E. In Situ delta 13CO2 from Cape Grim, Tasmania, Australia: 1982-1993. United States. doi:10.15485/1463812.
Francey, R. J., and Allison, C. E. 1998. "In Situ delta 13CO2 from Cape Grim, Tasmania, Australia: 1982-1993". United States. doi:10.15485/1463812. https://www.osti.gov/servlets/purl/1463812. Pub date:Sun Jul 26 00:00:00 EDT 1998
@article{osti_1463812,
title = {In Situ delta 13CO2 from Cape Grim, Tasmania, Australia: 1982-1993},
author = {Francey, R. J. and Allison, C. E.},
abstractNote = {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 degrees, condensation nucleus concentration below 600 cm3, and steady, continuous CO2 concentrations (variation +/- 0.2 ppmv per hour). The Cape Grim in situ extraction line is based on 3 high-efficiency glass U-tube traps with internal cooling coils. 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 intakes is dried with a trap inmersed in an alcohol bath at a temperature of about -80 degrees C. CO2 is collected in a second trap immersed in liquid nitrogen. A third liquid nitrogen trap guards against oil vapor back-steaming from the vacuum pump. Air flow is maintained for 2 hours, usually during late morning, at 300 mL/min. After this time, the trap holding the CO2 is raised to the alcohol bath temperature, and the CO2 is transferred cryogenically into a 100 mL glass flask for transport to CSIRO's Division of Atmospheric Research in Aspendale.The Cape Grim in situ record is possibly the most accurate representation of global atmospheric delta 13C behavior during the 1980s and 1990s. Changes in delta 13C of atmospheric CO2 are useful in elucidating the relative roles of oceanic and terrestrial uptake of CO2 from fossil fuel emissions. Francey et al. (1995) observed a gradual decrease in delta 13C for Cape Grim for 1982 to 1993, but with a pronounced flattening from 1988 to 1990. Francey et al. (1995) reported the flattening of the trend from 1988 to 1990 appears to involve the terrestrial carbon cycle.},
doi = {10.15485/1463812},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {7}
}

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