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Volcanic SO2 by UV-TIR satellite retrievals: validation by using ground-based network at Mt. Etna

机译:UV-TIR卫星检索的火山sO2:在mt.使用地面网络进行验证。埃特纳

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摘要

Mt. Etna volcano in Italy is one of the most active degassing volcanoes worldwide, emitting a mean of 1.7 Mt/year of Sulphur Dioxide (SO2) in quiescent periods. In this work, SO2 measurements retrieved by Moderate Resolution Imaging Spectroradiometer (MODIS), hyper-spectral Infrared Atmospheric Sounding Interferometer (IASI) and the second Global Ozone Monitoring Experiment (GOME-2) data are compared with the ground-based data from the FLux Automatic MEasurement monitoring network (FLAME). Among the eighteen lava fountain episodes occurring at Mt. Etna in 2011, the 10 Aprilparoxysmal event has been selected as a case-study for the simultaneous observation of the SO2 cloud by satellite and ground-based sensors. For each data-set two retrieval techniques were adopted and themeasurements of SO2 mass and flux with their respective uncertainty were obtained. With respect to the FLAME SO2 mass of 4.5 Gg, MODIS, IASI and GOME-2 differ by about 10%, 15% and 30%, respectively. The SO2 flux correlation coefficient between MODIS and FLAME is 0.84. All the retrievals within the respective errors are in agreement with the ground-based measurements supporting the validity of these space measurements.
机译:公吨。意大利的埃特纳火山是全球最活跃的脱气火山之一,在静止期平均每年排放1.7吨二氧化硫(SO2)。在这项工作中,将中等分辨率成像光谱仪(MODIS),高光谱红外大气探测干涉仪(IASI)和第二个全球臭氧监测实验(GOME-2)数据检索的SO2测量值与FLux的地面数据进行了比较。自动测量监控网络(FLAME)。在十八个熔岩喷泉事件发生在山。埃特纳火山(Etna)在2011年4月10日阵发性事件中被选为案例研究对象,用于通过卫星和地面传感器同时观测SO2云。对于每个数据集,均采用两种检索技术,并获得了SO2质量和通量的测量以及它们各自的不确定性。对于4.5 Gg的FLAME SO2质量,MODIS,IASI和GOME-2分别相差约10%,15%和30%。 MODIS和FLAME之间的SO2通量相关系数为0.84。在相应误差范围内的所有取回均与支持这些空间测量有效性的基于地面的测量一致。

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