Spatio-temporal variations of the atmospheric greenhouse gases and their sources and sinks in the Arctic region
Spatio-temporal variations of the atmospheric greenhouse gases and their sources and sinks in the Arctic region
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DOI：
10.1016/j.polar.2020.100553
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发表时间：
2020-07
期刊：
影响因子：
1.8
通讯作者：
S. Morimoto;D. Goto;S. Murayama;R. Fujita;R. Fujita;Y. Tohjima;S. Ishidoya;T. Machida;Y. Inai;P. Patra;Shamil Maksyutov;A. Ito;S. Aoki
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文献类型：
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作者：
S. Morimoto;D. Goto;S. Murayama;R. Fujita;R. Fujita;Y. Tohjima;S. Ishidoya;T. Machida;Y. Inai;P. Patra;Shamil Maksyutov;A. Ito;S. Aoki
为了了解北极地区大气温室气体的时空变化，我们进行了系统的观测和数值模式模拟。在尼奥勒苏德对二氧化碳、甲烷和相关成分的长期观测有助于区分海洋和陆地对二氧化碳的吸收速率，并揭示了生物来源的甲烷排放对大气甲烷变化的重要性。对北冰洋大气甲烷的船上观测表明，有几个峰值与大陆来源信号的远距离传输有关。北太平洋和北冰洋上的船载O2/N2观测证明了对气候O2通量的低估。在欧亚大陆上空8.5-12.5千米的对流层上层和平流层下层观测到明显的温室气体季节变化周期和长期趋势。通过对西西伯利亚湿地CH4排放的正、逆向模拟研究和直接观测，对以前自下而上研究估算的CH4通量进行了评估。为了与大气CH4观测一致，哈德逊湾低地和西西伯利亚分别需要向下和向上修正规定的CH4排放量。陆地生态系统模型研究表明，北美内陆、阿拉斯加和西西伯利亚低地北部的甲烷排放量呈增加趋势。
To understand the spatio-temporal variations of the atmospheric greenhouse gases in the Arctic region, we have conducted systematic observations and numerical model simulations. Long-term observations for CO2, CH4and related constituents at Ny-Ålesund helped in separating the oceanic and terrestrial uptake rates of CO2and revealed the importance of biogenic CH4emissions to atmospheric CH4variations. Shipboard observations of atmospheric CH4in the Arctic Ocean indicated several peaks associated with long-range transports of the continental source signals. An underestimation of climatological O2flux is demonstrated by the shipboard O2/N2observations over the North Pacific and Arctic Sea. Clear seasonal cycles and long-term trends of the greenhouse gases were observed in the upper troposphere and lower stratosphere over the Eurasian continent at 8.5–12.5 km in altitude. Forward and inverse modeling studies and direct observations of CH4emission from West Siberian wetlands were conducted to evaluate the CH4fluxes estimated by previous bottom-up studies. To be consistent with the atmospheric CH4observations, the prescribed CH4emission needs downward and upward revisions at Hudson Bay Lowland and West Siberia, respectively. The terrestrial ecosystem model study showed increasing trends in the CH4emission in inland North America, Alaska and northern part of West Siberian Lowland.