Methane, ethane, and propane are among the most abundant hydrocarbons in the atmosphere. These compounds have many emission sources in common and are all primarily removed through OH oxidation. Their mixing ratios and long-term trends in the upper troposphere and stratosphere are rarely reported due to the paucity of measurements. In this study, we present long-term (2006–2016) northern hemispheric ethane, propane, and methane data from airborne observation in the upper troposphere-lower stratosphere (UTLS) region from the IAGOS-CARIBIC project. The methane and propane observations provide additional information for understanding northern hemispheric ethane trends, which is the major focus of this study. The linear trends, moving averages, nonlinear trends and monthly variations of ethane, methane and propane in 2006–2016 are presented for the upper troposphere and lower stratosphere over 5 regions (whole Northern Hemisphere, Europe, North America, Asia and the rest of the world). The growth rates of ethane, methane, and propane in the upper troposphere are −2.24 % yr⁻¹, 0.33 % yr⁻¹, and −0.78 % yr⁻¹, respectively, and in the lower stratosphere they are −3.27 % yr⁻¹, 0.26 % yr⁻¹, and −4.91 % yr⁻¹, respectively, in 2006–2016. This dataset is of value to future global ethane budget estimates and the optimization of current ethane inventories. The data are publicly accessible at https://doi.org/10.5281/zenodo.6536109 (Li et al., 2022a).

中文翻译：

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参考甲烷和丙烷的北半球对流层上层和平流层下层大气乙烷趋势（2006-2016 年）

甲烷、乙烷和丙烷是大气中最丰富的碳氢化合物之一。这些化合物有许多共同的排放源，并且都主要通过 OH 氧化去除。由于缺乏测量，它们在对流层上层和平流层的混合比和长期趋势很少报道。在这项研究中，我们提供了来自 IAGOS-CARIBIC 项目的对流层上层 - 平流层下层 (UTLS) 区域空中观测的长期（2006-2016 年）北半球乙烷、丙烷和甲烷数据。甲烷和丙烷观测为了解北半球乙烷趋势提供了更多信息，这是本研究的主要重点。乙烷的线性趋势、移动平均线、非线性趋势和月度变化，2006-2016 年的甲烷和丙烷用于 5 个区域（整个北半球、欧洲、北美、亚洲和世界其他地区）的对流层上层和平流层下层。对流层上层乙烷、甲烷和丙烷的增长率分别为分别为-2.24  % yr ^-1、0.33 % yr ^-1和-0.78  % yr ^-1，在平流层较低层分别为-3.27  % yr ^-1、0.26 % yr ^-1和-4.91  % yr ^-1，分别在 2006-2016 年。该数据集对未来的全球乙烷预算估算和当前乙烷库存的优化具有价值。这些数据可在https://doi.org/10.5281/zenodo.6536109上公开访问（Li et al., 2022a）。