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TITLE OF THE DATA SET

Atmospheric CO2 concentrations derived from flask samples collected at U.S.S.R.operated
sampling sites.

CONTRIBUTORS

A. M. Brounshtein
E. V. Faber
A. A. Shashkov
Main Geophysical Observatory
Hydrometeorological Service of the U.S.S.R.
Karbyshev Str 7
194018 St. Petersburg, U.S.S.R.

DOI: 10.3334/CDIAC/atg.ndp033

SOURCE AND SCOPE OF THE DATA

Daily atmospheric CO2 concentrations from four U.S.S.R.operated sampling sites
(Teriberka Station, Ocean Station Charlie, Bering Island, and Kotelny Island) are provided. The
period of record varies by station with the earliest measurements dating back to 1983 and recent
estimates from early 1991. These CO2 concentrations are derived from air samples collected in
1.5L stainless steel electropolished flasks and later analyzed at the Main Geophysical Observatory
(St. Petersburg, U.S.S.R.) using a nondispersive infrared gas analyzer. Measurements not meeting
wind direction, wind speed, interflask agreement, and climate condition criteria have been either
discarded or flagged. All measurements have been corrected for drift biases introduced during
flask storage. These atmospheric CO2 concentrations are considered indicative of regional
background air conditions and are directly traceable to World Meteorological Organization
primary CO2 standards.


DATA FORMAT

Seven files are provided in this subdirectory including this documentation file
(NDP033.TXT), four data files containing atmospheric CO2 concentrations from each
of the four Soviet stations (KOTELNY.DAT, TERIBERK.DAT, STATIONC.DAT, & BERING.DAT), and
a FORTRAN IV and SAS retrieval code to read and print the data files (NDP033.FOR &
NDP033.SAS).

The data files are each formatted as

INTEGER SAMPYR, SAMPMO, SAMPDA, DAYYR
REAL TIME, CONC, DIFF
CHARACTER FLAG
READ(5,100,END99) SAMPYR,SAMPMO,SAMPDA,DAYYR,TIME,
1 CONC,DIFF,FLAG
100 FORMAT(5X,3(I2,1X),I3,1X,F8.4,1X,F8.4,1X,F5.1,3X,A1)

where

SAMPYR is the year the flask sample was collected;

SAMPMO is the month the flask sample was collected;

SAMPDA is the day of the month the flask sample was collected;

DAYYR is the day of the year the flask sample was collected;

TIME is the year and fraction of year expressed as a single decimal value;

CONC is the average CO2 concentration (ppmv). If DIFF is > 1 ppmv, the lesser of
the flask pair is chosen provided it is within 2 standard deviations of the
plotted smooth curve. If one of the two samples is lost the same criteria is
applied to the remaining sample concentration value. If DIFF is <1 ppmv,
the mean of the flask pair is used.

DIFF is the absolute value of the difference (ppmv) between the flask pair
concentrations;

FLAG is a flag describing the nature of DIFF. It is assigned a '+' if DIFF is less t
or equal to 1, an 'S' if DIFF is greater than 1, and an 'M' if CONC is derived
from a single flask.

Missing values for the variable DIFF are represented by ~99.9. All the data (CONC) presented
here have been adjusted for potential drifts in CO2 concentrations due to lengthy storage in stainle
steel flasks. These adjustments have been made using the formula:

dC t(0.23*e 0.51)

where dC is the correction added to the measured concentration value, t is the time in days between
air sample collection and analysis, and e is the water vapor partial pressure in the air sample
expressed in millibars.

Stated in tabular form, the contents include the following.



Variable Variable Starting Ending
Variable type width column column


SAMPYR Numeric I2 6 7
SAMPMO Numeric I2 9 10
SAMPDA Numeric I2 12 13
DAYYR Numeric I3 15 17
TIME Numeric F8.4 19 26
CONC Numeric F8.4 28 35
DIFF Numeric F5.1 37 41
FLAG Character A1 45 45



REFERENCES

Brounshtein, A. M., N. N. Paramonova, A. D. Frolov, and A. A. Shashkov. 1976. Optical method
for determination of CO2 total abundance in a vertical column of the atmosphere. Trudy
GGO 369:525.

Brounshtein, A. M., K. V. Kazakova, E. V. Faber, and A. A. Shashkov. 1988a. Measurements of
the CO2 concentration vertical distribution above the continental regions. Annals of the MG
519:3442.

Brounshtein, A. M., E. V. Faber, and A. A. Shashkov. 1988b. Measurements of the CO2
concentration above Leningrad. Annals of the MGO 519:4345.

Brounshtein, A. M., K. V. Kazakova, V. I. Medinez, and E. V. Faber. 1988c. Measurements of the
CO2 concentrations at Ocean Station "C" (North Atlantic). Annals of the MGO 519:2743.

Conway, T. J., P. Tans, L. S. Waterman, K. W. Thoning, K. A. Masarie, and R. H. Gammon. 1988.
Atmospheric carbon dioxide measurements in the remote global troposphere, 19811984.
Tellus 40B:81115.

Keeling, C. D., R. B. Bacastow, A. F. Carter, S. C. Piper, T. P. Whorf, M. Heimann, W. G. Mook,
and H. Roeloffzen. 1989. A threedimensional model of atmospheric CO2 transport based
on observed winds: 1. Analysis of observational data. pp. 165236. In D. H. Peterson (ed.)
Aspects of Climate Variability in the Pacific and Western Americas. Geophysical Monograph
55, American Geophysical Union, Washington, D.C.

Komhyr, W. D., R. H. Gammon, T. B. Harris, L. S. Waterman, T. J. Conway, W. R. Taylor, and K.
W. Thoning. 1985. Global atmospheric CO2 distribution and variations from 19681982
NOAA/GMCC CO2 flask sample data. Journal of Geophysical Research 90:55675596.

Pearman, G. I. and D. J. Beardsmore. 1984. Atmospheric carbon dioxide measurements in the
Australian region: Ten years of aircraft data. Tellus 36B:124.

World Meteorological Organization. 1989. Provisional Daily Atmospheric Carbon Dioxide
Concentrations as measured at BAPMoN sites for the years 1986 and 1987. WMO/TDNo.
306. Geneva, Switzerland.

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