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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Thermal and gas dynamic investigations at Lastarria volcano, Northern Chile. The influence of precipitation and atmospheric pressure on the fumarole temperature and the gas velocity
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Thermal and gas dynamic investigations at Lastarria volcano, Northern Chile. The influence of precipitation and atmospheric pressure on the fumarole temperature and the gas velocity

机译：智利北部拉斯特里亚火山的热力和天然气动力学研究。降水和大气压力对喷气孔温度和气体速度的影响

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AbstractFumaroles are hydrothermal manifestations commonly associated with active volcanoes. The dynamics of fumaroles are affected by interactions with internal and external factors, however, hazardous access and corrosive gases have so far limited successful case studies. In this study we report and discuss the results of continuous thermal monitoring carried out on three high temperature (>250°C) fumaroles at the Lastarria volcano Chile, together with simultaneously measured meteorological parameters from December 2013 to March 2016. In addition, the dynamic pressure and the CO2concentration were recorded in a fourth vent. The investigated sites are located in the largest and most dominant fumarole field which developed in a fracture system on the north-west flank of the volcanic edifice.We detect external factors controlling the fumarole temperature and the dynamic gas pressure, for a better understanding of changes in these parameters and, consequently, to improve the evaluation of volcanic and hydrothermal activity.Selected fumaroles showed a continuous decrease in temperature, or remained unbiased from this trend showing that the influence of external effects on outlet temperature is strongly site dependent. But generally, significant decreases in all vent temperatures can be observed in response to intensive precipitation. Diurnal variations occur only in the coolest fourth fumarole, where gas temperature, gas pressure and CO2concentration are inversely correlated with atmospheric pressure. Small barometric pressure reductions account for an increase in mass flow subsequently resulting in a higher temperature and CO2concentration.The temperatures and thermodynamic properties of the fumarolic gas and infiltrated precipitation water were used to calculate the amount of discharging gas from the investigated field with about 67×106m3per day which is equivalent to 3545tons.Highlights•The fumarole temperature decreases significantly in response to intensive precipitation.•Diurnal variations occur predominantly in low temperature fumaroles.•Exogenous factor including atmospheric pressure account for changes in mass flow, temperature and CO2concentration.•The amount of discharging gas estimated over an area of 0.23 km2is about 67 x 106m3per day, equivalent to 3545 tons per day.Graphical abstractDisplay Omitted
机译： 摘要 Fumaroles是通常与活火山相关的热液表现。内在因素和外在因素的相互作用会影响喷气孔的动力学，但是，到目前为止，危险通道和腐蚀性气体的成功案例研究受到限制。在本研究中，我们报告并讨论了在智利拉斯塔里亚火山上对三个高温（> 250°C）喷气孔进行的连续热监测的结果，以及从2013年12月至2016年3月同时测量的气象参数。在第四个排气孔中记录压力和CO 2 浓度。被调查的地点位于火山构造西北侧断裂系统中发育的最大，最主要的富马油田。 我们检测到控制喷气孔温度和动态气压的外部因素，以便更好地了解这些参数的变化，从而改善对火山和热液活动的评估。 所选的喷气孔显示出温度的持续下降，或与这种趋势保持一致，表明外部影响对出口温度的影响与位置密切相关。但是一般来说，响应强降水，可以观察到所有通风口温度的显着下降。日变化仅发生在最凉爽的第四喷气孔，那里的气体温度，气压和CO 2 浓度与大气压力成反比。小气压降低会导致质量流量增加，从而导致更高的温度和CO 2 浓度。 使用富马酸气和渗透的沉淀水的温度和热力学性质来计算约67×10 6 m 3 每天相当于3545吨。 突出显示 < ce：abstract-sec id =“ as0010” view =“ all”> • 喷气孔蛋彩 > > > > ：> ：> ：> 。 para id =“ p0010” view =“ all”>昼夜变化主要发生在低温喷气孔中。 • 包括大气压力在内的外在因素说明了质量流量，温度和CO的变化 2 浓度。 • 在0.23 km的区域估计的排气量 2 约为67 x 10 6 m 3 每天，相当于每天3545吨。 图形摘要 省略显示

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