Characterization of atmospheric methane release in the outer Mackenzie River delta from biogenic and thermogenic sources. Data used in Table 1.

A .pdf file containing geolocated atmospheric CH₄ and CO₂ mixing ratios for the Mackenzie-Beaufort Delta region of the Northwest Territories, Canada. CH₄ and CO₂ values are in parts per million by volume (ppmv). All sample air was drawn from approximately 1 m above ground level. Gas mixing ratios were standardized to Ameriflux FB04306 breathing grade air (benchmarked to 0.5 ppb). Measurements at sites Pingo 3 and Wetland 1 were obtained by using a portable Li-Cor LI-7810 gas analyser in the field. The Li-Cor LI-7810 gas analyser has an accuracy of 0.25 ppb. Measurements at sites Pingo 1, Pingo 2, Wetland 2, Wetland 3, and Site 9 were collected by filling a 30 m coil of 4 mm inside diameter aluminum Synflex tubing while walking at a steady pace across the ground. Coils of tubing were purged with nitrogen and sealed prior to sampling. A constant flow rate of 20 standard cubic centimetres per minute (SCCM) was maintained by attaching a small pump and a flow controller to the coil of tubing. Air samples were analysed immediately on return from the field site by feeding the sample into a Picarro G2210i analyser at the same rate at which it was filled. The Picarro G2210i analyser is accurate to within 0.001 ppm CH₄, and 1 ppm CO₂.

本数据集为一份PDF文件，收录加拿大西北地区麦肯齐-博福特三角洲区域的带有地理定位信息的大气甲烷（CH₄）与二氧化碳（CO₂）混合比数据。甲烷与二氧化碳的数值单位为体积混合比百万分率（parts per million by volume，缩写ppmv）。所有空气样本均采集自地面上方约1米处。气体混合比已参照Ameriflux FB04306呼吸级空气完成标准化校准，校准基准值为0.5 ppb。

Pingo 3与Wetland 1站点的测量数据，通过野外现场使用便携式Li-Cor LI-7810型气体分析仪获取，该分析仪的测量精度为0.25 ppb。

Pingo 1、Pingo 2、Wetland 2、Wetland 3及Site 9站点的测量数据，则通过以下方式采集：以稳定步速在地面行进时，将空气充入内径4 mm、长30 m的铝制Synflex盘管中。采样前，需用氮气吹扫盘管并进行密封处理。通过在盘管上连接小型泵与流量控制器，维持20标准立方厘米每分钟（standard cubic centimetres per minute，缩写SCCM）的恒定采样流量。从野外站点返回后，立即以与采样时相同的流速将空气样本注入Picarro G2210i型分析仪进行检测分析。该Picarro G2210i型分析仪的测量精度为：甲烷偏差不超过0.001 ppm，二氧化碳偏差不超过1 ppm。