Soil thermal gradient at Solfatara during 2020-2021 (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 (2020 and 2021) 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对与弥散脱气相关的能量通量进行监测，或可成为火山活动监测的重要手段。在纯传导状态下，热通量为土壤热梯度的线性函数，其斜率与介质的热导率成正比。为此，研究人员于2020年与2021年两年间，在索尔法塔拉（Solfatara）火山口内通过自动监测站持续采集土壤温度数据。该自动监测站搭载Gigalog mod.F型数据记录仪，以1小时间隔采集0.1m、0.2m、0.3m及0.4m深度处的垂直剖面土壤温度。本次测量采用4支铂类B级电阻温度探测器（Resistance Temperature Detector，RTD）PT100，其在0℃时的测量允差为±0.3℃，测量结果以摄氏度为单位。该监测仪器的坐标为33T 427461.48m E 4520150.14m N