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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Sulfur Dioxide Emissions And Degassing Behavior Of Erebus Volcano, Antarctica
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Sulfur Dioxide Emissions And Degassing Behavior Of Erebus Volcano, Antarctica

机译：南极洲埃雷布斯火山的二氧化硫排放与脱气行为

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摘要

Emission rates of sulfur dioxide (SO_2) were measured at Erebus volcano, Antarctica in December between 1992 and 2005. Since 1992 SO_2 emissions rates are normally distributed with a mean of 61 ± 27 Mg d~(-1) (0.7±0.3 kg s~(-1) (n - 8064). The emission rates vary over minutes, hours, days and years. Hourly and daily variations often show systematic and cyclic trends. Long-wavelength, large amplitude trends appear related to lava lake area and both are likely controlled by processes occurring at depth. Time series analysis of continuous sequences of measurements obtained over periods of several hours reveals periodicity in SO_2 output ranging from 10 to 360 min, with a 10 min cycle being the most dominant Closed and open-system degassing models are considered to explain observed variable degassing rates. Closed-system degassing is possible as rheological stiffening and stick/slip may occur within the system. However, the timescales represented in these models do not fit observations made on Erebus. Open-system degassing and convection fits the observations collected as the presented models were developed for a system similar to Erebus in terms of degassing, eruptive activity and process repose time. We show that with the observed emission rate (0.71 kg s~(-1)) and a crystal content of 30%, magma will cool 65 °C to match observed heat fluxes; this cooling is sufficient enough to drive convection.
机译：在1992年至2005年12月间，对南极洲埃雷布斯火山的二氧化硫（SO_2）排放率进行了测量。自1992年以来，SO_2排放率呈正态分布，平均为61±27 Mg d〜（-1）（0.7±0.3 kg s 〜（-1）（n-8064）。排放量在数分钟，数小时，数天和数年内变化。每小时和每天的变化通常显示出系统性和周期性的趋势。长波，大振幅趋势与熔岩湖面积有关，并且两者都时间序列对几个小时内获得的连续测量序列的时间序列分析显示，SO_2输出的周期性为10到360分钟，其中10分钟为最主要的封闭式和开放式系统脱气考虑使用模型来解释观察到的脱气速率变化，因为系统中可能发生流变变硬和粘滑，因此可以进行闭系统脱气，但是这些模型中表示的时间尺度与疯狂的观察结果不符。 e在Erebus上。开放系统的脱气和对流适合收集的观察结果，因为所提出的模型是针对类似于Erebus的系统开发的，在脱气，喷发活动和过程休止时间方面均是如此。我们发现，在观察到的发射速率（0.71 kg s〜（-1））和晶体含量为30％的情况下，岩浆将冷却65°C以匹配观察到的热通量。这种冷却足以驱动对流。

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