Abstract
Abstract. In this paper, we introduce and provide access to daily (1960–2017) and hourly (1993–2017) datasets of snow and meteorological data measured at the Col de Porte site, 1325 m a.s.l., Chartreuse, France. Site metadata and ancillary measurements such as soil properties and masks of the incident solar radiation are also provided. Weekly snow profiles are made available from September 1993 to March 2018. A detailed study of the uncertainties originating from both measurement errors and spatial variability within the measurement site is provided for several variables. We show that the estimates of the ratio of diffuse-to-total shortwave broadband irradiance is affected by an uncertainty of ±0.21 (no unit). The estimated root mean square deviation, which mainly represents spatial variability, is ±10 cm for snow depth, ±25 kg m−2 for the water equivalent of snow cover (SWE), and ±1 K for soil temperature (±0.4 K during the snow season). The daily dataset can be used to quantify the effect of climate change at this site, with a decrease of the mean snow depth (1 December to 30 April) of 39 cm from the 1960–1990 period to the 1990–2017 period (40 % of the mean snow depth for 1960–1990) and an increase in temperature of +0.90 K for the same periods. Finally, we show that the daily and hourly datasets are useful and appropriate for driving and evaluating a snowpack model over such a long period. The data are placed on the repository of the Observatoire des Sciences de l'Univers de Grenoble (OSUG) data centre: https://doi.org/10.17178/CRYOBSCLIM.CDP.2018.
Highlights
The Col de Porte (CDP) site is a mid-elevation meadow site located at 1325 m altitude (45.30◦ N, 5.77◦ E) in the Chartreuse mountain range
We extend the period and the number of points used for the uncertainty evaluations for snow depth, the water equivalent of snow cover, and soil temperature, for which several measurements are available over a sufficiently long period
The laser measurements indicated a spatial variability of the snow depth within the footprint that can reach 7–10 cm (RMSD)
Summary
The Col de Porte (CDP) site is a mid-elevation meadow site located at 1325 m altitude (45.30◦ N, 5.77◦ E) in the Chartreuse mountain range. Measured data are manually and automatically checked and corrected using the measurements of several sensors and meteorological analyses (SAFRAN, Durand et al, 1999) if required, ensuring the quality and continuity of the dataset Such a dataset provides a unique framework to drive and evaluate snowpack models over a long period. Lejeune et al.: Col de Porte snow and meteorological data drological observational archives from long-term research catchments in well-instrumented mountain regions around the world, such as the Col du Lac Blanc dataset (Guyomarc’h et al, 2019) This initiative arises from a GEWEX Hydroclimatology Panel cross-cut project, INARCH (available at: http://www.usask.ca/inarch, last access: 3 December 2018), the International Network for Alpine Research Catchment Hydrology. The second section is dedicated to providing estimates of measurement uncertainties and spatial variability within the site, and the last section describes some examples of the use of this dataset
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