We present a new method for deriving surface soil gas flux at the field scale, which is less fieldwork intensive than traditional chamber techniques and less expensive than those derived from airborne or space surveys. The “open-field” technique uses aspects of chamber and micrometeorological methods combined with a mobile platform and GPS to rapidly derive soil gas fluxes at the field scale. There are several assumptions in using this method, which will be most accurate under stable atmospheric conditions with little horizontal wind flow. Results show that soil gas fluxes, when averaged across a field site, are highly comparable between the open-field method and traditional chamber acquisition techniques. Atmospheric dilution is found to reduce the range of flux values under the open-field method, when compared to chamber-derived results at the field scale. Under ideal atmospheric conditions it may be possible to use the open-field method to derive soil gas flux at an individual point; however this requires further investigation. The open-field method for deriving soil–atmosphere gas exchange at the field scale could be useful for a number of applications including quantification of leakage from CO₂ geological storage sites, diffuse degassing in volcanic and geothermal areas, and greenhouse gas emissions, particularly when combined with traditional techniques.

中文翻译：

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使用近地表大气测量值来量化田间规模的土壤气体通量

我们提出了一种在田间尺度上推导出地表土壤气体通量的新方法，该方法比传统的室技术强度低，而且比从机载或空间勘测中获得的方法便宜。“开放领域”技术利用舱室和微气象方法与移动平台和GPS相结合，在田间尺度上快速获得土壤气体通量。使用此方法有几个假设，这些假设在稳定的大气条件下几乎没有水平风流时将是最准确的。结果表明，在整个田间场地平均土壤通量时，在开放田法和传统的室内采集技术之间具有很高的可比性。在开场法中，发现大气稀释会减小通量值的范围，与现场规模的试验箱得出的结果相比。在理想的大气条件下，可能可以使用开场方法得出单个点的土壤气体通量。但是，这需要进一步调查。在田间尺度上推导土壤-大气气体交换的露天方法可能对许多应用有用，包括定量分析CO ₂地质存储地点，火山和地热地区的扩散脱气以及温室气体排放，特别是与传统技术结合使用时。