Atmospheric CO2 Record from In Situ Measurements at Amsterdam Island (1980-1995)
Until 1993 air samples were collected continuously through an air intake located at the top of a tower, 9 m above ground and 65 m above mean sea level. Since 1994, the intake has been situated 20 m above ground and 76 m above mean sea level. The tower is located at the north-northwest end of the isl...
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ftosti:oai:osti.gov:1394176 2023-07-30T03:55:59+02:00 Atmospheric CO2 Record from In Situ Measurements at Amsterdam Island (1980-1995) Gaudry, A. Kazan, V. Monfray, P. 2022-10-27 application/pdf http://www.osti.gov/servlets/purl/1394176 https://www.osti.gov/biblio/1394176 https://doi.org/10.3334/CDIAC/ATG.013 unknown http://www.osti.gov/servlets/purl/1394176 https://www.osti.gov/biblio/1394176 https://doi.org/10.3334/CDIAC/ATG.013 doi:10.3334/CDIAC/ATG.013 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.3334/CDIAC/ATG.013 2023-07-11T09:21:19Z Until 1993 air samples were collected continuously through an air intake located at the top of a tower, 9 m above ground and 65 m above mean sea level. Since 1994, the intake has been situated 20 m above ground and 76 m above mean sea level. The tower is located at the north-northwest end of the island on the edge of a 55 m cliff. The air is dried by means of a cryogenic water trap at -60°C. Until 1990, determinations of CO2 were made by using successively two Hartmann-Braun URAS 2T nondispersive infrared (NDIR) analyzers. Since 1991, CO2 determinations have been made using a Siemens ULTRAMAT 5F NDIR. Standard gases in use from October 1980 to December of 1984 were CO2-in-N2 mixtures certified by Scripps Institution of Oceanography (SIO). The N2 scale was corrected for the carrier gas effect to obtain the air scale (WMO mole fraction scale). In 1985, CO2-in-air mixtures expressed in the 1985 WMO mole fraction in air scale were introduced. In 1990, a new series of 12 primary standard gases were gravimetrically prepared, then linearly adjusted at the laboratory and checked several times (i.e., 1990, 1992, and 1993) through intercalibrations with DSIR in New Zealand and NOAA/CMDL, which both used the 1985 mole fraction scale. The agreement was always better than 0.1 ppm (Monfray et al. 1992). Since 1993, the 1993 mole fraction scale has been used thanks to a new series of 10 cylinders provided by SIO.For access to the data files, click this link to the CDIAC data transition website: http://cdiac.ess-dive.lbl.gov/trends/co2/amster.html Other/Unknown Material Amsterdam Island SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) New Zealand Scripps ENVELOPE(-63.783,-63.783,-69.150,-69.150) Uras ENVELOPE(42.939,42.939,63.262,63.262) |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Gaudry, A. Kazan, V. Monfray, P. Atmospheric CO2 Record from In Situ Measurements at Amsterdam Island (1980-1995) |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Until 1993 air samples were collected continuously through an air intake located at the top of a tower, 9 m above ground and 65 m above mean sea level. Since 1994, the intake has been situated 20 m above ground and 76 m above mean sea level. The tower is located at the north-northwest end of the island on the edge of a 55 m cliff. The air is dried by means of a cryogenic water trap at -60°C. Until 1990, determinations of CO2 were made by using successively two Hartmann-Braun URAS 2T nondispersive infrared (NDIR) analyzers. Since 1991, CO2 determinations have been made using a Siemens ULTRAMAT 5F NDIR. Standard gases in use from October 1980 to December of 1984 were CO2-in-N2 mixtures certified by Scripps Institution of Oceanography (SIO). The N2 scale was corrected for the carrier gas effect to obtain the air scale (WMO mole fraction scale). In 1985, CO2-in-air mixtures expressed in the 1985 WMO mole fraction in air scale were introduced. In 1990, a new series of 12 primary standard gases were gravimetrically prepared, then linearly adjusted at the laboratory and checked several times (i.e., 1990, 1992, and 1993) through intercalibrations with DSIR in New Zealand and NOAA/CMDL, which both used the 1985 mole fraction scale. The agreement was always better than 0.1 ppm (Monfray et al. 1992). Since 1993, the 1993 mole fraction scale has been used thanks to a new series of 10 cylinders provided by SIO.For access to the data files, click this link to the CDIAC data transition website: http://cdiac.ess-dive.lbl.gov/trends/co2/amster.html |
author |
Gaudry, A. Kazan, V. Monfray, P. |
author_facet |
Gaudry, A. Kazan, V. Monfray, P. |
author_sort |
Gaudry, A. |
title |
Atmospheric CO2 Record from In Situ Measurements at Amsterdam Island (1980-1995) |
title_short |
Atmospheric CO2 Record from In Situ Measurements at Amsterdam Island (1980-1995) |
title_full |
Atmospheric CO2 Record from In Situ Measurements at Amsterdam Island (1980-1995) |
title_fullStr |
Atmospheric CO2 Record from In Situ Measurements at Amsterdam Island (1980-1995) |
title_full_unstemmed |
Atmospheric CO2 Record from In Situ Measurements at Amsterdam Island (1980-1995) |
title_sort |
atmospheric co2 record from in situ measurements at amsterdam island (1980-1995) |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1394176 https://www.osti.gov/biblio/1394176 https://doi.org/10.3334/CDIAC/ATG.013 |
long_lat |
ENVELOPE(-63.783,-63.783,-69.150,-69.150) ENVELOPE(42.939,42.939,63.262,63.262) |
geographic |
New Zealand Scripps Uras |
geographic_facet |
New Zealand Scripps Uras |
genre |
Amsterdam Island |
genre_facet |
Amsterdam Island |
op_relation |
http://www.osti.gov/servlets/purl/1394176 https://www.osti.gov/biblio/1394176 https://doi.org/10.3334/CDIAC/ATG.013 doi:10.3334/CDIAC/ATG.013 |
op_doi |
https://doi.org/10.3334/CDIAC/ATG.013 |
_version_ |
1772810554676609024 |