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Title: Atmospheric Carbon Dioxide Record from In Situ Measurements at Mt. Cimone (1979-1997)

Abstract

Continuous atmospheric CO2 measurements have been carried out at Mt. Cimone since 1979. Since December 1988, air samples have also been collected approximately once per week in a pair of 2-L, electropolished, stainless steel cylindrical flasks. From 1979 until December 1988, a Hartmann and Braun URAS-2T NDIR gas analyzer was used for CO2 determinations. Currently, CO2 determinations are made through the use of a Siemens Ultramat-5E NDIR gas analyzer. Water vapor is eliminated by passing the air through a U-tube placed in an alcohol bath at -600°C. Calibration of the Ultramat-5E is accomplished by using two CO2-in-air working standard gases. These working standard gas concentrations are checked 10 days apart against three CO2-in-air mixtures that serve as secondary standards. The secondary standards are checked every 6 months against five other CO2-in-air primary standards. Hourly CO2 values are routinely plotted together with wind data. Anomalous concentrations and those affected by instrument failures or local sources are rejected. Atmospheric CO2 concentrations from Mt. Cimone are reported in the 1993 WMO/Scripps mole fraction scale. For further details on the measurement apparatus and sampling techniques used at Mt. Cimone, see Cundari et al. (1990).

Authors:
;
  1. Italian Meteorological Service, Sestola (MO), Italy
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)
OSTI Identifier:
1394196
DOI:
10.3334/CDIAC/ATG.016

Citation Formats

Colombo, Tiziano, and Santaguida, Riccardo. Atmospheric Carbon Dioxide Record from In Situ Measurements at Mt. Cimone (1979-1997). United States: N. p., 1998. Web. doi:10.3334/CDIAC/ATG.016.
Colombo, Tiziano, & Santaguida, Riccardo. Atmospheric Carbon Dioxide Record from In Situ Measurements at Mt. Cimone (1979-1997). United States. doi:10.3334/CDIAC/ATG.016.
Colombo, Tiziano, and Santaguida, Riccardo. 1998. "Atmospheric Carbon Dioxide Record from In Situ Measurements at Mt. Cimone (1979-1997)". United States. doi:10.3334/CDIAC/ATG.016. https://www.osti.gov/servlets/purl/1394196. Pub date:Thu Jan 01 00:00:00 EST 1998
@article{osti_1394196,
title = {Atmospheric Carbon Dioxide Record from In Situ Measurements at Mt. Cimone (1979-1997)},
author = {Colombo, Tiziano and Santaguida, Riccardo},
abstractNote = {Continuous atmospheric CO2 measurements have been carried out at Mt. Cimone since 1979. Since December 1988, air samples have also been collected approximately once per week in a pair of 2-L, electropolished, stainless steel cylindrical flasks. From 1979 until December 1988, a Hartmann and Braun URAS-2T NDIR gas analyzer was used for CO2 determinations. Currently, CO2 determinations are made through the use of a Siemens Ultramat-5E NDIR gas analyzer. Water vapor is eliminated by passing the air through a U-tube placed in an alcohol bath at -600°C. Calibration of the Ultramat-5E is accomplished by using two CO2-in-air working standard gases. These working standard gas concentrations are checked 10 days apart against three CO2-in-air mixtures that serve as secondary standards. The secondary standards are checked every 6 months against five other CO2-in-air primary standards. Hourly CO2 values are routinely plotted together with wind data. Anomalous concentrations and those affected by instrument failures or local sources are rejected. Atmospheric CO2 concentrations from Mt. Cimone are reported in the 1993 WMO/Scripps mole fraction scale. For further details on the measurement apparatus and sampling techniques used at Mt. Cimone, see Cundari et al. (1990).},
doi = {10.3334/CDIAC/ATG.016},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}