Usability of water surface reflectance for the determination of riverine dissolved methane during extreme flooding in northeastern Siberia
Usability of water surface reflectance for the determination of riverine dissolved methane during extreme flooding in northeastern Siberia
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DOI：
10.1016/j.polar.2019.01.005
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发表时间：
2019-09
期刊：
影响因子：
1.8
通讯作者：
Tomoki Morozumi;Ryo Shingubara;J. Murase;S. Nagai;Hideki Kobayashi;Shinya Takano;S. Tei;R. Fan;T. Maximov;A. Sugimoto
中科院分区：
文献类型：
--
作者：
Tomoki Morozumi;Ryo Shingubara;J. Murase;S. Nagai;Hideki Kobayashi;Shinya Takano;S. Tei;R. Fan;T. Maximov;A. Sugimoto
2017年6月至7月，西伯利亚东北部因迪吉尔卡河低地发生了一次极端洪水事件。利用Landsat 8卫星的地表反射率数据进行洪水淹没面积的检测和水体颜色的提取，以划分不同的水源。我们还直接采集了河水中溶解甲烷浓度的样本。2017年，在洪水消退期间，在四个支流区域观察到相对较高的溶解甲烷浓度（0.7-1.1 μmol l−1，或μM），而主要通道的数值仍然较低（0.2-0.3 μM）。相比之下，在2016年非洪水期间，主河道和支流的溶解甲烷浓度较低（0.1-0.2 μM）。然后，我们使用2017年卫星反射率数据和经验模型来估计贡献于甲烷贫乏的主河道和甲烷丰富的支流的水源的溶解甲烷浓度的空间差异，并将结果应用于研究区域的河流甲烷计算（约1000立方米）。200 × 300公里）。这种利用卫星反射率估算溶解甲烷浓度的方法可以为偏远地区洪水事件的环境监测提供一种新的工具。
An extreme flooding event occurred from June to July 2017 in the Indigirka River lowland of northeastern Siberia. We used Landsat 8 satellite surface reflectance data to detect the flood inundation area and extract water color for delineating different water sources. We also took direct samples of dissolved methane concentrations in the river water. Relatively high concentrations of dissolved methane (0.7–1.1 μmol l−1, or μM) were observed in four tributary areas in 2017 during the flood's recession, while the values remained low in the main channel (0.2–0.3 μM). In contrast, the concentrations of dissolved methane were low in both the main channel and tributaries during the non-flood period of 2016 (0.1–0.2 μM). We then used 2017 satellite reflectance data with an empirical model to estimate the spatial differences of dissolved methane concentration for water sources contributing to the methane-poor main channel and methane-rich tributaries and applied the results to the calculation of riverine methane in the study region (approx. 200 × 300 km). This approach to estimating dissolved methane concentrations using satellite reflectance can provide a new tool for environmental monitoring of flood events in remote areas.