A study on temporal variations of the atmospheric methane concentration at Canadian sub-Arctic region using its carbon and hydrogen isotope ratios

大气甲烷是最重要的温室气体之一，加拿大亚北极地区被认为是甲烷的重要来源地区。我们在丘吉尔(58°N，94°W)保持了系统的空气采样，并随后对甲烷中碳和氢的稳定同位素(δ^&lt；13&gt；C、δD)进行了4年的分析。通过对其季节变化周期的分析，表明湿地甲烷排放对甲烷浓度的变化起着重要作用。

Atmospheric methane is one of the most important greenhouse gases and Canadian sub-Arctic is considered to be an important source region of it. We have maintained systematic air sampling at Churchill (58°N, 94°W) and subsequent analyses for stable isotopes of carbon and hydrogen (δ^<13>C、δD) in methane for 4 years. By analyzing their seasonal cycles, it is implied that methane emission from wetland plays an important role in the CH_4 concentration variation.