大气中的甲烷记录(Alert, NWT, 加拿大)(Atmospheric Methane Record from Alert, NWT, Canada).pdf

大气中的甲烷记录（Alert, NWT, 加拿大） (Atmospheric Methane Record from Alert, NWT, Canada) 数据介绍： The listed data have been obtained from flask air samples returned to the CSIRO GASLAB for analysis. Typical sample storage times range from days to weeks for some sites (e.g., Cape Grim) to as much as one year for Macquarie Island and the Antarctic sites. Experiments carried out to test for any change in sample CH4 mixing ratio during storage have shown no drift to within detection limits over test periods of several months to years (Cooper et al., 1999). 关键词： 数据格式： TEXT 数据详细介绍： Atmospheric Methane Record from Alert, NWT, Canada Investigators L.P. Steele, P.B. Krummel and R.L. Langenfelds Commonwealth Scientific and Industrial Research Organization (CSIRO), Atmospheric Research, Aspendale, Victoria , Australia, 3195 Period of Record May 1991 - December 2001 Methods The listed data have been obtained from flask air samples returned to the CSIRO GASLAB for analysis. Typical sample storage times range from days to weeks for some sites (e.g., Cape Grim) to as much as one year for Macquarie Island and the Antarctic sites. Experiments carried out to test for any change in sample CH4 mixing ratio during storage have shown no drift to within detection limits over test periods of several months to years (Cooper et al., 1999). Samples were analysed by gas chromatography with flame ionization detection (FID). Three individual but similarly configured Carle gas chromatographs were used over the length of the record. They are labeled Carle-1 (C1), Carle-2 (C2) and Carle-3 (C3). Further details of CSIROs global sampling network, sampling and analytical techniques are provided by Francey et al. (1996); measurement uncertainty is discussed by Langenfelds et al. (2001). Data are reported in the CSIRO94 CH4 scale (Steele et al., 1996), which is derived from the CH4 s