Continuous measurement of atmospheric CO2 concentration at Syowa Station

• Main Authors: Shuhji Aoki, Takakiyo Nakazawa
• Format: Article in Journal/Newspaper
• Language: English; Japanese
• Published: National Institute of Polar Research 1997
• Subjects: Geography (General); G1-922; Syowa Station; Antarc*; Antarctica; E. Antarctica
• Online Access: https://doi.org/10.15094/00008967; https://doaj.org/article/a97318b6b9e6401bb81407a16506c392

Precise and continuous measurements of atmospheric CO_2 concentration have been continued at Syowa Station (69°00′S, 39°35′E), Antarctica since February 1984. Diurnal CO_2 variation was hardly observable throughout the year. The secular CO_2 trend was variable with time, showing slow increase in 1984,1986 and 1988 and rapid increase in 1985 and 1987. The annual CO_2 increase was remarkable, especially in 1987,which may have been related to the 1987 ENSO event. The average rate of annual CO_2 increase over the last 5 years was about 1.6ppmv yr^<-1>. The average seasonal CO_2 cycle showed minimum and maximum concentrations in mid-April and in early October, respectively. Its peak-to-peak amplitude was about 1.1ppmv for the period 1984-1988. The seasonal cycle was variable from year to year, but there was no indication of long-term amplitude increase. It was found that irregular CO_2 variations with amplitudes of about 0.2ppmv and with periods of a few tens of days have high correlation with air mass exchange by synoptic scale weather disturbances.