Evaluating the degradation of permafrost is a major challenge in understanding global warming and its impact on the cryosphere. The Global Cryosphere Watch is promoting actions towards data quality and traceability, to achieve comparability of observations from different permafrost stations. In response to this, a transportable system for on‐site calibrations of permafrost temperature sensors was studied, developed and tested in the field, within the project MeteoMet. The system, here described, allows users to establish metrological traceability to permafrost temperature profiles, by performing the calibration on‐site, even in remote or high‐elevation areas, in realistic conditions. A field campaign at 3,000 m elevation to test the system's performance and practical use is also reported. Overall calibration uncertainty in the field accounted for <0.05 °C, with contribution from reference sensors within 2 mK over the whole range; besides reducing uncertainties in each measuring point of a chain, the procedure also allows users to establish comparability among all the sensors within 0.03 °C. The self‐heating effect of each sensor was also evaluated as 0.007 °C, and was thus considered a negligible component. The evolution of permafrost thawing can be more robustly evaluated, through documented data traceability together with improved comparability in space and time.

中文翻译：

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用于永久冻土温度传感器现场校准的便携式系统

评估多年冻土的退化是理解全球变暖及其对冰冻圈影响的主要挑战。全球冰冻圈监视网正在促进采取行动以提高数据质量和可追溯性，以实现不同多年冻土站观测资料的可比性。为此，在MeteoMet项目中，研究，开发和测试了用于永久冻土温度传感器现场校准的便携式系统。这里描述的系统允许用户通过在实际情况下甚至在偏远或高海拔地区进行现场校准来建立对多年冻土温度曲线的计量可追溯性。还报告了在3,000 m高处进行的野外试验，以测试系统的性能和实际使用情况。现场的总体校准不确定度为<0.05°C，整个范围内参考传感器的贡献在2 mK之内；除了减少链上每个测量点的不确定性外，该程序还允许用户在0.03°C以内的所有传感器之间建立可比性。每个传感器的自热效应也评估为0.007°C，因此可以忽略不计。通过记录的数据可追溯性以及改进的时空可比性，可以更可靠地评估多年冻土融化的演变。每个传感器的自热效应也评估为0.007°C，因此可以忽略不计。通过记录的数据可追溯性以及改进的时空可比性，可以更可靠地评估多年冻土融化的演变。每个传感器的自热效应也评估为0.007°C，因此可以忽略不计。通过记录的数据可追溯性以及改进的时空可比性，可以更可靠地评估多年冻土融化的演变。