1,721,005 research outputs found
Rock and debris temperature in the alpine cryosphere
No full textMore than 218,000 rock and debris temperature data, acquired from July 2016 to August 2018 in an alpine experimental glacial basin, in different 12 measurement sites (MS) with different lithological and slope/aspect conditions, at an elevation range from 2600 to 2800 m a.s.l, are present. The temperature data have been acquired by using 10 MadgeTech MicroTemp Data Logger (MT), metrologically referenced and with known measurement uncertainty (0.098 °C)
Rock temperature variability in the alpine cryosphere
No full textIn a context of cryosphere degradation caused by climate warming, rock temperature is one of the main driving factors of rockfalls that occur on high-elevation mountain slopes. In order to improve the knowledge of this critical relationship, it is necessary to increase measurement capability of rock temperature and its variability in different lithological and slope/aspect conditions, and also to increase local scale studies, increasing the quality and the comparability of the data. Rock temperature data, acquired from July 2018 to July 2022 in an alpine experimental glacial basin (https://deims.org/f8718e56-fb4d-49a3-92a9-3670e7f10ee9), in different two temperature monitoring sites (TMS) with the same lithological conditions (calc-schists) but in two different aspect conditions (South and North), at an elevation range from 2653 to 2667 m a.s.l, are present. The temperature data have been acquired by using six MadgeTech MicroTemp Data Logger (MT), metrologically referenced and with known measurement uncertainty (0.098 °C)
The air temperature conundrum
No full textMeasuring air temperature is far from a trivial task, as Andrea Merlone, Graziano Coppa and Chiara Musacchio explain
"Albedo effect" experiment
No full textThis dataset is relative to the "albedo effect" experiment that has been carried out in the winter 2016/2017 in Balme, Turin, Italy, during project MeteoMet 2.
The experiment consists in two measurement points, 20 m apart, in an open flat field, each hosting 6 different meteorological temperature sensors and shields in a pair, so that each of the systems in one measurement point has an identical twin in the other measurement point. Each measurement point also hosts an albedometer to measure incident and reflected radiation and hygrometers. In a third measurement point, wind speed is measured.
The difference between the two main measurement points is that on point "a", snow was left for the whole winter, while on point "b" it was removed in 4 occasions (30 November, 22 December 2016, 20 January and 23 February 2017). The height of the snow never exceeded 40 cm
An experimental method for evaluation of the snow albedo effect on near-surface air temperature measurements
No full textMetrological approach for permafrost temperature measurements
Full text linkPermafrost degradation is a growing direct impact of climate change. Detecting permafrost shrinkage, in terms of extension, depth reduction and active layer shift is fundamental to capture the magnitude of trends and address actions and warnings. Temperature profiles in permafrost allow direct understanding of the status of the frozen ground layer and its evolution in time. The Sommeiller Pass permafrost monitoring station, at about 3000 m of elevation, is the key site of the regional network installed in 2009 during the European Project “PermaNET” in the Piedmont Alps (NW Italy). The station consists of three vertical boreholes with different characteristics, equipped with a total of 36 thermistors distributed in three different chains. The collected raw data shows a degradation of the permafrost base at approximately 60 m of depth since 2014, corresponding to about 0.03 °C/yr. In order to verify and better quantify this potential degradation, three on-site sensor calibration campaigns were carried out to understand the reliability of these measurements. By repeating calibrations in different years, two key results have been achieved: the profiles have been corrected for errors and the re-calibration allowed to distinguish the effective change of permafrost temperatures during the years, from possible drifts of the sensors, which can be of the same order of magnitude of the investigated thermal change. The warming of permafrost base at a depth of ∼ 60 m has been confirmed, with a rate of (4.2 ± 0.5)∙10−2 °C/yr. This paper reports the implementation and installation of the on-site metrology laboratory, the dedicated calibration procedure adopted, the calibration results and the resulting adjusted data, profiles and their evolution with time. It is intended as a further contribution to the ongoing studies and definition of best practices, to improve data traceability and comparability, as prescribed by the World Meteorological Organization Global Cryosphere Watch programme
Towards a calibration laboratory in Ny-Ålesund
No full textMultitudes of measurements are needed to understand the environment and its evolution. The Arctic region is a fundamental observation area for climate change evaluation: climate change comes first and comes faster in the Arctic. The higher accuracy required to quickly capture trends; the extreme range and conditions of sensors exposure; a robust comparability asked by the different measurement networks; the need of dedicated calibration procedures, together with the logistical problems associated with such remote location, motivate the proposal for a joint effort to address metrology experience and activities for Arctic research applications. The Ny-Ålesund international research base and community offers a unique infrastructure to directly link metrological traceability to on site polar measurements. The contribution reports a study on the implementation of specific calibration procedures, metrological validation of measurements and instrument tests, uncertainties evaluations including quantities of influence, and the feasibility of a metrology laboratory in Ny-Ålesund
Rock temperature variability in high-altitude rockfall-prone areas
Full text linkIn a context of cryosphere degradation caused by climate warming, rock temperature is one of the main driving factors of rockfalls that occur on high-elevation mountain slopes. In order to improve the knowledge of this critical relationship, it is necessary to increase measurement capability of rock temperature and its variability in different lithological and slope/aspect conditions, and also to increase local scale studies, increasing the quality and the comparability of the data. This paper shows an example of metrological characterization of sensors used for rock temperature measurement in mountain regions, by means of the measurement uncertainty. Under such approach, data and results from temperature measurements carried out in the Bessanese high-elevation experimental site (Western European Alps) are illustrated. The procedures for the calibration and field characterization of sensors allow to measure temperature in different locations, depths and lithotypes, within 0.10 °C of overall uncertainty. This work has highlighted that metrological traceability is fundamental to asses data quality and establish comparability among different measurements; that there are strong differences between air temperature and near-surface rock temperature; and that there are significant differences of rock temperature acquired in different aspect conditions. Finally, solar radiation, slope/aspect conditions and lithotype, seem to be the main driving factors of rock temperature
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