...
  • 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 >First combined flux chamber survey of mercury and CO_2 emissions from soil diffuse degassing at Solfatara of Pozzuoli crater, Campi Flegrei (Italy): Mapping and quantification of gas release
【24h】

First combined flux chamber survey of mercury and CO_2 emissions from soil diffuse degassing at Solfatara of Pozzuoli crater, Campi Flegrei (Italy): Mapping and quantification of gas release

机译：在Campi Flegrei（意大利）的Pozzuoli crater的Solfatara，对土壤弥散脱气中的汞和CO_2排放进行了首次组合通量室调查：气体释放的绘图和定量

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

There have been limited studies to date targeting gaseous elemental mercury (GEM) flux from soil emission in enriched volcanic substrates and its relation with CO_2 release and tectonic structures. In order to evaluate and understand the processes of soil-air exchanges involved at Solfatara of Pozzuoli volcano, the most active zone of Campi Flegrei caldera (Italy), an intensive field measurement survey has been achieved in September 2013 by using high-time resolution techniques. Soil-air exchange fluxes of GEM and CO_2 have been measured simultaneously at 116 points, widely distributed within the crater. Quantification of gas flux has been assessed by using field accumulation chamber method in conjunction with a Lumex®-RA 915+ portable mercury vapor analyzer and a UCOR for CO_2 determination, respectively. The spatial distribution of GEM and CO_2 emissions correlated quite closely with the hydrothermal and geological features of the studied area. The highest GEM fluxes (from 4.04 to 5.9 × 10~(-5) g m~(-2) d~(-1)) were encountered close to the southern part of the crater interested by an intense fumarolic activity and alongthe SE-SW tectonic fracture (1.26 × 10~(-6)-6.91 × 10~(-5)g GEM m~(-2)d~(-1)). Conversely, the lowest values have been detected all along the western rim of the crater, characterized by a weak gas flux and a lush vegetation on a very sealed clay soil, which likely inhibited mercury emission (range: 1.5 × 10~(-7)-7.18 × 10~(-6) g GEM m~(-2) d~(-1)). Results indicate that the GEM exchange between soil and air inside the Solfatara crater is about 2-3 orders of magnitude stronger than that in the background areas (10~(-8)-10~(-7) g m~(-2) d~(-1)). CO_2 soil diffuse degassing exhibited an analogous spatial pattern to the GEM fluxes, with emission rates ranging from about 15 to ～20,000 g CO_2 m~(-1) d~(-1) from the outermost western zones to the south-eastern sector of the crater. The observed significant correlation between GEM and CO_2 suggested that in volcanic system GEM volatilizes from substrate in a similar manner to the release of CO_2. The quantitative estimation of the total amount of CO_2 and GEM released from the Solfatara crater gave values of about 304 ± 13 and 3.7 ± 0.2 × 10~(-6)t d~(-1) respectively. Finally, based on our dataset and previous work, we propose that an average GEM/CO_2 molar ratio of ～2 × 10~(-8) (n = 9) is best representative of hydrothermal degassing. Taking into account the uncertainty in global hydrothermal CO_2 emissions from sub-aerial environments (～10~(12) Mol yr~(-1)), we infer a global volcanic GEM flux from hydrothermal environments of ～about 8.5 t yr~(-1). Although this value has to be considered as a lower limit for the global emission of GEM from these sources, we suggest that on a local scale hydrothermal activity can be regarded as a significant source of GEM than previously recognized to the atmospheric pool.
机译：迄今为止，针对富集火山基质中土壤排放的气态元素汞（GEM）通量及其与CO_2释放和构造结构的关系的研究很少。为了评估和了解在Campi Flegrei火山口（意大利）最活跃的地区波佐利火山的Solfatara所涉及的土壤-空气交换过程，2013年9月已通过使用高分辨率技术进行了密集的野外测量调查。已在116个点同时测量了GEM和CO_2的土壤-空气交换通量，这些通量广泛分布在火山口内。气体通量的量化已通过使用场累积室法，分别与Lumex®-RA915+便携式汞蒸气分析仪和用于CO_2测定的UCOR进行了评估。 GEM和CO_2排放的空间分布与研究区域的水热和地质特征密切相关。靠近火山口南部并受到强烈的富马酸盐活动影响的SE-SW处遇到了最高的GEM通量（从4.04到5.9×10〜（-5）gm〜（-2）d〜（-1））。构造断裂（1.26×10〜（-6）-6.91×10〜（-5）g GEM m〜（-2）d〜（-1））。相反，在整个火山口的西边缘都检测到了最低值，其特征是在密封性很强的黏土上气体通量较弱且植被茂盛，很可能抑制了汞的排放（范围：1.5×10〜（-7） -7.18×10〜（-6）g GEM m〜（-2）d〜（-1））。结果表明，Solfatara火山口内土壤与空气之间的GEM交换比背景区域（10〜（-8）-10〜（-7）gm〜（-2）d）强约2-3个数量级。 〜（-1））。从最西部的区域到东南部的CO_2土壤扩散脱气表现出与GEM通量相似的空间格局，其排放速率约为15至〜20,000 g CO_2 m〜（-1）d〜（-1）。火山口。观察到的GEM和CO_2之间的显着相关性表明，在火山系统中，GEM以与CO_2释放相似的方式从底物挥发。从Solfatara火山口释放的CO_2和GEM总量的定量估算值分别约为304±13和3.7±0.2×10〜（-6）t d〜（-1）。最后，根据我们的数据集和先​​前的工作，我们建议平均GEM / CO_2摩尔比为〜2×10〜（-8）（n = 9）是水热脱气的最佳代表。考虑到来自地下环境的全球热液CO_2排放的不确定性（〜10〜（12）Mol yr〜（-1）），我们推断出来自热液环境的全球火山岩GEM通量约为8.5 t yr〜（- 1）。尽管必须将此值视为这些来源的全球GEM排放量的下限，但我们建议，在局部范围内，热液活动可被视为比以前从大气池中认识到的GEM的重要来源。

著录项

  • 来源
  • 作者

    E. Bagnato; M. Barra; C. Cardellini; G. Chiodini; F. Parello; M. Sprovieri;

  • 作者单位

    Dipartimento di Scienze della Terra e del Mare (DiSTeM), Universita di Palermo, Via Archirafi 36, 90123 Palermo, Italy,Dipartimento di Fisica e Geologia, Universita di Perugia, Via Pascoli, 06123 Perugia, Italy;

    Istituto per l'Ambiente Marino Costiero, Consiglio Nazionale delle Ricerche (IAMC-CNR), Calata Porta di Massa, 80133 Napoli, Italy;

    Dipartimento di Fisica e Geologia, Universita di Perugia, Via Pascoli, 06123 Perugia, Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Via Diocleziano 328, Napoli, Italy;

    Dipartimento di Scienze della Terra e del Mare (DiSTeM), Universita di Palermo, Via Archirafi 36, 90123 Palermo, Italy;

    Istituto per l'Ambiente Marino Costiero, Consiglio Nazionale delle Ricerche (IAMC-CNR), Via del Mare 3, 91021, Torretta Granitola, Mazara, Trapani, Italy;

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

    Mercury flux; Carbon dioxide; Solfatara; Soil degassing; Volcanic mercury;

    机译：汞通量二氧化碳;Solfatara;土壤脱气;火山汞;

相似文献

  • 外文文献
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