Diffuse volcanic gas emission and thermal energy release from the summit crater of Pico do Fogo, Cape Verde
Diffuse volcanic gas emission and thermal energy release from the summit crater of Pico do Fogo, Cape Verde
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佛得角福戈峰山顶火山口的弥漫火山气体排放和热能释放
DOI：
10.1007/s00445-014-0897-4
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发表时间：
2015
影响因子：
3.5
通讯作者：
Pereira J.M. and Semedo H.
中科院分区：
文献类型：
--
作者：
Dionis S.D.;Melián G.;Rodríguez F.;Hernández P.A.;Padrón E.;Pérez N.M.;Barrancos J.;Padilla G.;Sumino H.;Fernandes P.;Bandomo Z.;Silva S.V.;Pereira J.M. and Semedo H.
我们报告的第一个详细的研究扩散排放的二氧化碳（CO2），硫化氢（H2S），氦（He），和氢（H2）从山顶火山口的皮科多福戈，佛得角。在57个采样点测量了扩散的CO2、H2S、He和H2气体通量，范围分别为12，800、13、1和6 g m−2day−1。土壤温度测量在每个采样点被用来评估热通量。大部分山顶陨石坑显示出相对较高的CO2流出量，最高值接近火山口区域，表明脱气过程受到结构控制。相比之下，山顶火山口的H2S排放量可以忽略不计或非常低，除了靠近火山口的地区，那里也测量到了非常高的CO2排放量和土壤温度。我们估计CO2、H2S、He和H2扩散气体的总通量分别为219 t/d、25 kg/d、4 kg/d和33 kg/d。根据在火山口测得的H2O/CO2质量比为1.52，我们估计山顶火山口的扩散蒸汽通量约为330 t day−1。该蒸汽的焓相当于约10.3MW的热通量。从皮科多福戈火山山顶火山口释放的扩散气体排放和热能与在其他火山观察到的情况相当。使用这些方法对福戈皮科火山进行持续监测，将有助于监测大西洋最活跃的火山之一的活动。
We report the first detailed study of diffuse emission of carbon dioxide (CO2), hydrogen sulfide (H2S), helium (He), and hydrogen (H2) from the summit crater of Pico do Fogo volcano, Cape Verde. Diffuse CO2, H2S, He, and H2gas fluxes were measured at 57 sampling sites and ranged up to 12,800, 13, 1, and 6 g m−2day−1, respectively. Soil temperature measurements at each sampling site were used to evaluate the heat flux. Most of the summit crater shows relatively high CO2efflux, with highest values close to the fumarolic area, suggesting a structural control of the degassing process. In contrast, H2S effluxes were negligible or very low at the summit crater, except close to the fumarolic area where anomalously high CO2efflux and soil temperatures were also measured. We estimate total CO2, H2S, He, and H2diffuse gas fluxes of 219 t day−1, 25, 4, and 33 kg day−1, respectively. Based on a H2O/CO2mass ratio of 1.52 measured at the fumaroles, we estimate a diffuse steam flux from the summit crater of approximately 330 t day−1. The enthalpy of this steam is equivalent to a heat flux of about 10.3 MW. The diffuse gas emission and thermal energy released from the summit crater of Pico do Fogo volcano are comparable to those observed at other volcanoes. Sustained surveillance of Pico do Fogo using these methods will be valuable for monitoring the activity of one of the most active volcanoes in the Atlantic Ocean.