Observation of column-averaged molar mixing ratios of carbon dioxide in Tokyo
Observation of column-averaged molar mixing ratios of carbon dioxide in Tokyo
复制标题
东京二氧化碳柱平均摩尔混合比的观察
DOI：
10.1016/j.aeaoa.2019.100022
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发表时间：
2019
影响因子：
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通讯作者：
Ohashi Masafumi
中科院分区：
文献类型：
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作者：
Qin Xiu-Chun;Nakayama Tomoki;Matsumi Yutaka;Kawasaki Masahiro;Imasu Ryoichi;Morino Isamu;Tanaka Yoshihiro;Ishidoya Shigeyuki;Sato Kenta;Ohashi Masafumi
日本首都东京的大都市圈排放了大量的二氧化碳(CO2)，这是一种人为的温室气体。我们使用台式光谱分析仪测量了2014年9月至2016年8月东京市中心地区大气CO2和XCO2的日间柱状平均干空气摩尔混合比。将观测到的季节周期与位于筑波的总碳柱观测网站点观测到的季节周期进行了比较，筑波位于东京东北方向60 公里处。两个站点之间的XCO2差异在12-2月期间很高(∼5 ppm)，而在6-9月期间较低(∼0.5 ppm)。根据当地排放源和地面气象资料，参考地面CO2浓度的变化，解释了东京XCO2的特征变化。7月份东京和筑波地区XCO2的尖锐峰值被解释为该地区的局部空气滞留，正如飞机剖面和风流正向轨迹计算所表明的那样。最后，我们将地面柱子观测与自上而下卫星柱子观测进行了比较。
The metropolitan area of Tokyo, the capital of Japan, emits a large amount of carbon dioxide (CO2), an anthropogenic greenhouse gas. We measured the day-time column-averaged dry-air molar mixing ratios of atmospheric CO2, XCO2, in the central area of Tokyo during September 2014 – August 2016 using a desktop optical spectrum analyzer. The observed seasonal cycle is compared with the seasonal cycle that is observed at the Total Carbon Column Observing Network (TCCON) site in Tsukuba, which is located 60 km to the northeastern direction of Tokyo. The differences in XCO2between the two sites are high (∼5 ppm) during December – February and low (∼0.5 ppm) during June – September. The characteristic variations of XCO2in Tokyo are interpreted in terms of local emission sources and surface meteorological data, by referring to the variations in the concentrations of surface CO2. The sharp peaks in XCO2at both the Tokyo and Tsukuba sites in July are interpreted in terms of local air retention in the areas, as indicated by the aircraft profiles and wind-flow forward trajectory calculations. Finally, we compare the ground-based column measurements with the top-down satellite column observations.