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Title: Atmospheric Carbon Dioxide Record from In Situ Measurements at Baring Head (1970 - 1993)

Abstract

Determinations of atmospheric CO2 mixing ratios are made using a Siemens Ultramat-3 nondispersive infrared (NDIR) gas analyzer. The NDIR CO2 analyzer is connected via a gas manifold consisting of stainless steel tubing and computer-controlled solenoid switches to 12 gas cylinders and 2 sample air lines. The NDIR analyzer compares ambient air CO2 mixing ratios relative to known CO2 mixing ratios in tanks of compressed reference gases. The analyzer operates in a differential mode, with a "zero" reference gas of CO2 mixing ratio 20 to 30 parts per million (ppm) below ambient air CO2 levels flowing continuously through one cell of the analyzer at ~10 mL/min. When atmospheric CO2 is measured, a diaphragm pump pulls air through a sampling line at ~5 L/min. A small fraction of this (180 mL/min) is dried cryogenically to a temperature of approximately ¬70° Celsius and passed through the sample cell of the CO2 analyzer. Both the "zero" and sample gas are exhausted into the observatory building.

Authors:
; ;
  1. National Institute of Water and Atmospheric Research, Ltd., Lower Hutt, New Zealand
  2. National Institute of Water and Atmospheric Research, Ltd. Lower Hutt, New Zealand
Publication Date:
Product Type:
Dataset
Research Org.:
Environmental System Science Data Infrastructure for a Virtual Ecosystem; Carbon Dioxide Information Analysis Center (CDIAC), Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Subject:
54 ENVIRONMENTAL SCIENCES
OSTI Identifier:
1394197
DOI:
10.3334/CDIAC/ATG.017

Citation Formats

Manning, M. R., Gomez, A. J., and Pohl, K. P. Atmospheric Carbon Dioxide Record from In Situ Measurements at Baring Head (1970 - 1993). United States: N. p., 1994. Web. doi:10.3334/CDIAC/ATG.017.
Manning, M. R., Gomez, A. J., & Pohl, K. P. Atmospheric Carbon Dioxide Record from In Situ Measurements at Baring Head (1970 - 1993). United States. doi:10.3334/CDIAC/ATG.017.
Manning, M. R., Gomez, A. J., and Pohl, K. P. 1994. "Atmospheric Carbon Dioxide Record from In Situ Measurements at Baring Head (1970 - 1993)". United States. doi:10.3334/CDIAC/ATG.017. https://www.osti.gov/servlets/purl/1394197. Pub date:Sat Jan 01 00:00:00 EST 1994
@article{osti_1394197,
title = {Atmospheric Carbon Dioxide Record from In Situ Measurements at Baring Head (1970 - 1993)},
author = {Manning, M. R. and Gomez, A. J. and Pohl, K. P.},
abstractNote = {Determinations of atmospheric CO2 mixing ratios are made using a Siemens Ultramat-3 nondispersive infrared (NDIR) gas analyzer. The NDIR CO2 analyzer is connected via a gas manifold consisting of stainless steel tubing and computer-controlled solenoid switches to 12 gas cylinders and 2 sample air lines. The NDIR analyzer compares ambient air CO2 mixing ratios relative to known CO2 mixing ratios in tanks of compressed reference gases. The analyzer operates in a differential mode, with a "zero" reference gas of CO2 mixing ratio 20 to 30 parts per million (ppm) below ambient air CO2 levels flowing continuously through one cell of the analyzer at ~10 mL/min. When atmospheric CO2 is measured, a diaphragm pump pulls air through a sampling line at ~5 L/min. A small fraction of this (180 mL/min) is dried cryogenically to a temperature of approximately ¬70° Celsius and passed through the sample cell of the CO2 analyzer. Both the "zero" and sample gas are exhausted into the observatory building.},
doi = {10.3334/CDIAC/ATG.017},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}

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