Continuous measurements of methane from a tower network over Siberia
Continuous measurements of methane from a tower network over Siberia
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西伯利亚塔网连续测量甲烷
DOI：
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发表时间：
2010
期刊：
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通讯作者：
Shamil Maksyutov
中科院分区：
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作者：
M. Sasakawa;K. Shimoyama;T. Machida;N. Tsuda;H. Suto;M. Arshinov;D. Davydov;A. Fofonov;O. Krasnov;T. Saeki;Y. Koyama;Shamil Maksyutov
自2004年以来，我们一直在西伯利亚的针叶林，草原和湿地生物群落中进行不断扩大的塔网络（JR站：日本-俄罗斯西伯利亚高塔内陆观测网络）的甲烷（sCH 4）浓度的连续测量。冬季在几个塔同时观测到的高白天平均值（>2000 ppb），以及现场天气数据和NCEP/NCAR再分析数据表明，由于逆温层的广泛形成，高压系统导致了次大陆尺度的CH 4积累。白天的手段，有时超过2000 ppb，特别是在2007年夏天，当温度和降水率是非常高的西西伯利亚，这意味着甲烷排放量从湿地是非常高的，在2007年。2007年夏季MODIS探测到的许多热点表明，生物质燃烧的贡献也不容忽视。白天平均CH 4浓度从西伯利亚塔网站普遍高于CH 4值报告在NOAA沿海网站在同一纬度带，和两套网站之间的浓度差异再现耦合欧拉-拉格朗日运输模型。模拟不同CH 4源的排放表明，变化的主要贡献者在夏季从湿地到冬季的化石燃料。
We have been conducting continuous measurements of Methane (sCH4) concentration from an expanding network of towers (JR-STATION: Japan–Russia Siberian Tall Tower Inland Observation Network) located in taiga, steppe and wetland biomes of Siberia since 2004. High daytime means (>2000 ppb) observed simultaneously at several towers during winter, together with in situ weather data and NCEP/NCAR reanalysis data, indicate that high pressure systems caused CH4 accumulation at subcontinental scale due to the widespread formation of an inversion layer. Daytime means sometimes exceeded 2000 ppb, particularly in the summer of 2007 when temperature and precipitation rates were anomalously high over West Siberia, which implies that CH4 emission from wetlands were exceptionally high in 2007. Many hot spots detected by MODIS in the summer of 2007 illustrate that the contribution of biomass burning also cannot be neglected. Daytime mean CH4 concentrations from the Siberian tower sites were generally higher than CH4 values reported at NOAA coastal sites in the same latitudinal zone, and the difference in concentrations between two sets of sites was reproduced with a coupled Eulerian–Lagrangian transport model. Simulations of emissions from different CH4 sources suggested that the major contributor to variation switched from wetlands during summer to fossil fuel during winter.