Telesca L. auteur aut IRD Shaban A. auteur aut IRD Gascoin S. auteur aut IRD Darwich T. auteur aut IRD Drapeau Laurent auteur aut IRD El Hage M. auteur aut IRD Faour G. auteur aut IRD text journalArticle eng text/pdf born digital access In this study, the time dynamics of the monthly means of the snow cover have been on Lebanese Mountain Chains from 2000 to 2012, derived from the MODIS Aqua/Terra satellite snow products was analyzed. This represents the longest satellite-based snow cover time series produced for Lebanon so far. Field survey was also carried out over the last three years in order to measure the in-situ snow/water equivalent and depth in different localities. Analyzing the regime of the snow cover in Mount-Lebanon (Western Mountain Chains) region, it was found that: (i) snowmelt accounts for about 31% of the rivers and springs discharge in Lebanon; (ii) consecutive peaks in the snow cover time series, representing the change-point between accumulation phase and ablation phase are present in three different patterns (edged, non-edged and double peaked); (iii) the areal snow coverage has big diversity between different years; (iv) the annual periodicity represents the most statistically significant and predominant frequency of the series contributing for about the 40% of the total variance of the snow cover series; (v) the longterm trend, totally hidden by the more powerful yearly component and detected by using the singular spectrum analysis (SSA), accounts for about the 33% of the total variance of the series; (vi) the long-term trend shows an apparent cyclic behavior with an estimated period (interval between the two minima) of about nine years; (vii) the comparison of the long-term trend with the North Atlantic Oscillation (NAO) monthly index reveals that the minima in 2009-2010 of the SSA long-term component coincides with a persistent negative phase in the NAO Index. specialized Snowpack Satellite image SSA Periodogram Lebanon LIBAN 062 126 519 D 3214-3222 2014 0022-1694 https://www.documentation.ird.fr/hor/fdi:010063690 10.1016/j.jhydrol.2014.10.037 0022-1694 [F B010063690] https://www.documentation.ird.fr/hor/fdi:010063690 https://www.documentation.ird.fr/intranet/publi/2015/02/010063690.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2015-03-03 2017-08-23 fdi:010063690 fre