Snow observations in Mount Lebanon (2011-2016)

2017

Article référencé dans le Web of Science WOS:000407711900001

Fayad A., Gascoin S., Faour G., Fanise Pascal, Drapeau Laurent, Somma J., Fadel A., Al Bitar A., Escadafal Richard

Earth System Science Data, 2017, 9 (2), p. 573-587 ISSN 1866-3508

We present a unique meteorological and snow observational dataset in Mount Lebanon, a mountainous region with a Mediterranean climate, where snowmelt is an essential water resource. The study region covers the recharge area of three karstic river basins (total area of 1092 km(2) and an elevation up to 3088 m). The dataset consists of (1) continuous meteorological and snow height observations, (2) snowpack field measurements, and (3) medium-resolution satellite snow cover data. The continuous meteorological measurements at three automatic weather stations (MZA, 2296 m; LAQ, 1840 m; and CED, 2834 m a.s.l.) include surface air temperature and humidity, precipitation, wind speed and direction, incoming and reflected shortwave irradiance, and snow height, at 30 min intervals for the snow seasons (November-June) between 2011 and 2016 for MZA and between 2014 and 2016 for CED and LAQ. Precipitation data were filtered and corrected for Geonor under-catch. Observations of snow height (HS), snow water equivalent, and snow density were collected at 30 snow courses located at elevations between 1300 and 2900m a.s.l. during the two snow seasons of 2014-2016 with an average revisit time of 11 days. Daily gap-free snow cover extent (SCA) and snow cover duration (SCD) maps derived from MODIS snow products are provided for the same period (2011-2016). We used the dataset to characterize mean snow height, snow water equivalent (SWE), and density for the first time in Mount Lebanon. Snow seasonal variability was characterized with high HS and SWE variance and a relatively high snow density mean equal to 467 kgm(-3). We find that the relationship between snow depth and snow density is specific to the Mediterranean climate. The current model explained 34% of the variability in the entire dataset (all regions between 1300 and 2900m a.s.l.) and 62% for high mountain regions (elevation 2200-2900 m a.s.l.). The dataset is suitable for the investigation of snow dynamics and for the forcing and validation of energy balance models. Therefore, this dataset bears the potential to greatly improve the quantification of snowmelt and mountain hydrometeorological processes in this data-scarce region of the eastern Mediterranean.

Sciences du milieu [021] ; Hydrologie [062]

ZONE MEDITERRANEENNE

Fonds IRD [F B010070874]

fdi:010070874