...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Volcanology and Geothermal Research >The effects of environmental parameters on diffuse degassing at Stromboli volcano: Insights from joint monitoring of soil CO2 flux and radon activity
【24h】

The effects of environmental parameters on diffuse degassing at Stromboli volcano: Insights from joint monitoring of soil CO2 flux and radon activity

机译：环境参数对斯特龙博利火山扩散脱气的影响：联合监测土壤二氧化碳通量和ra活度的见解

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Soil CO2 flux and Rn-222 activity measurements may positively contribute to the geochemical monitoring of active volcanoes. The influence of several environmental parameters on the gas signals has been substantially demonstrated. Therefore, the implementation of tools capable of removing (or minimising) the contribution of the atmospheric effects from the acquired time series is a challenge in volcano surveillance. Here, we present 4 years-long continuous monitoring (from April 2007 to September 2011) of radon activity and soil CO2 flux collected on the NE flank of Stromboli volcano. Both gases record higher emissions during fall-winter (up to 2700 Bq* m(-3) for radon and 750 g m(-2) day(-1) for CO2) than during spring-summer seasons. Short-time variations on Rn-222 activity are modulated by changes in soil humidity (rainfall), and changes in soil CO2 flux that may be ascribed to variations in wind speed and direction. The spectral analyses reveal diurnal and semi-diurnal cycles on both gases, outlining that atmospheric variations are capable to modify the gas release rate from the soil. The long-term soil CO2 flux shows a slow decreasing trend, not visible in Rn-222 activity, suggesting a possible difference in the source depth of the of the gases, CO2 being deeper and likely related to degassing at depth of the magma batch involved in the February-April 2007 effusive eruption. To minimise the effect of the environmental parameters on the Rn-222 concentrations and soil CO2 fluxes, two different statistical treatments were applied: the Multiple Linear Regression (MLR) and the Principal Component Regression (PCR). These approaches allow to quantify the weight of each environmental factor on the two gas species and show a strong influence of some parameters on the gas transfer processes through soils. The residual values of radon and CO2 flux, i.e. the values obtained after correction for the environmental influence, were then compared with the eruptive episodes that occurred at Stromboli during the analysed time span (2007-2011) but no clear correlations emerge between soil gas release and volcanic activity. This is probably due to i) the distal location of the monitoring stations with respect to the active craters and to ii) the fact that during the investigated period no major eruptive phenomena (paroxysmal explosion, flank eruption) occurred. Comparison of MLR and PCR methods in time-series analysis indicates that MLR can be more easily applied to real time data processing in monitoring of open conduit active volcanoes (like Stromboli) where the transition to an eruptive phase may occur in relatively short times. (C) 2016 Elsevier B.V. All rights reserved.
机译：土壤CO2通量和Rn-222活性测量值可能对活跃火山的地球化学监测有积极作用。几个环境参数对气体信号的影响已得到充分证明。因此，实现能够从所获取的时间序列中消除（或最小化）大气影响的工具是火山监测的一个挑战。在这里，我们对Stromboli火山NE侧面收集的ra活动和土壤CO2通量进行了为期4年的连续监测（从2007年4月至2011年9月）。与春夏季相比，这两种气体在秋冬期间的排放量都更高（ra气的排放量高达2700 Bq * m（-3），CO2的排放量高达750 g m（-2）day（-1））。 Rn-222活性的短期变化受到土壤湿度（降雨）变化以及土壤CO2通量变化的调节，这可能归因于风速和风向的变化。光谱分析揭示了两种气体的昼夜循环和半昼夜循环，表明大气变化能够改变土壤中的气体释放速率。长期的土壤CO2通量显示出缓慢的下降趋势，在Rn-222活动中不可见，表明气体的源深可能存在差异，CO2较深且可能与所涉及的岩浆批次深度的脱气有关在2007年2月至4月的喷发中。为了最小化环境参数对Rn-222浓度和土壤CO2通量的影响，应用了两种不同的统计处理方法：多元线性回归（MLR）和主成分回归（PCR）。这些方法可以量化两种气体物种上每种环境因子的权重，并显示某些参数对通过土壤的气体传输过程的强烈影响。然后将ra和CO2通量的残留值（即校正环境影响后获得的值）与所分析的时间跨度（2007-2011年）中Stromboli发生的爆发事件进行比较，但土壤气体释放之间没有明确的相关性和火山活动。这可能是由于以下原因：i）监测站相对于活动火山口的远端位置，以及ii）在调查期间未发生重大喷发现象（阵发性爆炸，后侧爆发）的事实。在时间序列分析中对MLR和PCR方法的比较表明，MLR可以更轻松地应用于实时数据处理，以监测开放式管道活火山（如Stromboli），在这些火山中可能会在相对短的时间内发生转变。 （C）2016 Elsevier B.V.保留所有权利。

著录项

  • 来源
  • 作者

    Laiolo M.; Ranaldi M.; Tarchini L.; Carapezza M. L.; Coppola D.; Ricci T.; Cigolini C.;

  • 作者单位

    Univ Florence, Dipartimento Sci Terra, Via G La Pira 4, I-50121 Florence, Italy|Univ Turin, Dipartimento Sci Terra, Via Valperga Caluso 35, I-10125 Turin, Italy;

    Univ Rome Tre, Dipartimento Sci, Largo San L Murialdo 1, I-00146 Rome, Italy|INGV, Sez Roma 1, Via Vigna Murata 605, I-00143 Rome, Italy;

    Univ Rome Tre, Dipartimento Sci, Largo San L Murialdo 1, I-00146 Rome, Italy|INGV, Sez Roma 1, Via Vigna Murata 605, I-00143 Rome, Italy;

    INGV, Sez Roma 1, Via Vigna Murata 605, I-00143 Rome, Italy;

    Univ Turin, Dipartimento Sci Terra, Via Valperga Caluso 35, I-10125 Turin, Italy;

    INGV, Sez Roma 1, Via Vigna Murata 605, I-00143 Rome, Italy;

    Univ Turin, Dipartimento Sci Terra, Via Valperga Caluso 35, I-10125 Turin, Italy|Univ Turin, Ctr Interdipartimentale Rischi Nat Ambiente Monta, NatRisk, I-10124 Turin, Italy;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Stromboli volcano; Continuous geochemical monitoring; Soil CO2 flux; Radon activity; Environmental parameters; Time series analyses;

    机译：Stromboli火山;连续地球化学监测;土壤CO2通量;Ra活度;环境参数;时间序列分析;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号