Soil thermal gradient at Solfatara during 2016-2017 (Campi Flegrei, south Italy)

The monitoring of energy fluxes associated with diffuse degassing may bean important tool in the surveillance of volcanic activity. In a purely conductive regime, the heat flux is a linear function of the soil thermal gradient with a slope proportional to the thermal conductivity of the medium. For that reason, soil temperatures were continuously measured during two years (january 2016 to january 2018) within the crater of Solfatara using an automatic station. The station was equipped with a Gigalog mod.F data logger that acquires, at 1-hour time intervals, the soil temperature along a vertical profile at 0.1, 0.2, 0.3 and 0.4 m depth, The measurements, expressed in degrees centrigade, made with n.4 Resistance Temperature Detector "RTD" PT100 in platinum class B with a tolerance of ±0.3 °C at 0°C. The coordinates of the instrument are 33T 427461.48m E 4520150.14m N<br>与弥散脱气相关的能量通量监测，可作为火山活动监测的重要手段。在纯传导模式下，热通量与土壤热梯度呈线性函数关系，其斜率与介质的热导率成正比。为此，研究团队于2016年1月至2018年1月期间，利用自动监测站在索尔法塔拉（Solfatara）火山口内连续两年开展土壤温度监测。该监测站搭载Gigalog mod.F型数据记录仪，以1小时间隔采集0.1、0.2、0.3及0.4米深度处垂直剖面的土壤温度。本次测量以摄氏度为单位，采用4支铂类B级PT100型电阻温度探测器（Resistance Temperature Detector，RTD），其在0℃时的测量公差为±0.3℃。该仪器的坐标为：33T 427461.48m E，4520150.14m N。