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Atmospheric Carbon Dioxide Record from Kotelny IslandInvestigatorsA.M. Brounshtein,* A.A. Shashkov, N.N. Paramonova, V.I. Privalov, Y.A. Starodubtsev
A major part of the Russian atmospheric CO2 monitoring program in 1993-94 was financed through Project 96-1 of the Environmental Research Support Scheme of the Central European University in Budapest, established by George Soros. We are grateful to George Soros and to the Advisory Board of the Central European University Environmental Department for their kind attention and support. Period of Record1986-93 MethodsAir is collected generally four times per month in pairs of 1.5-L stainless steel electropolished flasks with one greaseless stainless steel stopcock. Sampling is performed by opening the stopcock of the flasks, which have been evacuated at the central laboratory at the Main Geophysical Observatory (MGO). The air is not dried during sample collection. Attempts are made to obtain samples when the wind speed is >5 m/s and the wind direction corresponds to the predetermined "clean air" sector. After the air samples are collected, the flasks are mailed to the central laboratory at the MGO once per month for CO2 determinations, which are made through the use of a URAS-2T nondispersive infrared gas analyzer. Storage times between sample collection and analysis range from 2 to 6 months. Air samples are dried cryogenically before analysis. The URAS-2T nondispersive infrared gas analyzer is calibrated by using CO2-in-synthetic air reference gases. All gases were initially calibrated at the Scripps Institution of Oceanography (SIO) against the primary standards maintained by the World Meteorological Organization (WMO) and against NOAA/GMCC standards in 1981. In 1988 and 1989, MGO reference gases were compared with a NOAA/GMCC set of three travelling CO2-in-air gas standards. During 1990-93, 13 series of calibrations were performed against a set of 5 CO2-in-air-standards provided by the Atmospheric Environment Service (AES) of Canada. On the basis of these calibration experiments, all MGO data were recalculated to a new scale that is closely related to the WMO X87 scale through the AES standards. A 2-year field comparison program with AES, involving a regular exchange of air samples from Alert and Teriberka, showed that data from both programs are comparable within 0.2 parts per million (ppm). Concentration values for both flasks in a pair are accepted if the difference between the values is <1 ppmv. More details about the sampling methods and selection criteria are provided in Brounshtein et al. (1985, 1988a, 1988b, 1988c) and in Shashkov and Paramonova (in press). Kotelny Island, Russia
TrendsThe period of record at Kotelny Island is too short to identify any long-term trends in atmospheric CO2 concentrations; however, the yearly mean atmospheric CO2 concentration at Kotelny Island rose from 356.08 parts per million by volume (ppmv) in 1988 to 358.8 ppmv in 1993. The record from Kotelny Island exhibits a pronounced seasonal oscillation due to photosynthetic depletion during the growing season. Because Kotelny Island is the northernmost Russian sampling site, measurements from this site serve as a useful comparison to other northern sites (e.g., Alert, Northwest Territories). References
CITE AS: Brounshtein, A.M., A.A. Shashkov, N.N. Paramonova, V.I. Privalov, and Y.A. Starodubtsev. 1994. Atmospheric CO2 records from sites in the Main Geophysical Observatory air sampling network. In Trends: A Compendium of Data on Global Change. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tenn., U.S.A. 7/10/97 |
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