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. The quantification of volumetric ice and water content in active rockglaciers is necessary to estimate their role as water stores andcontributors to runoff in dry mountain catchments. In the semi-arid to aridAndes of Argentina, active rock glaciers potentially constitute importantwater reservoirs due to their widespread distribution. Here however, waterstorage capacities and their interannual changes have so far escapedquantification in detailed field studies. Volumetric ice and water contentwas quantified using a petrophysical four-phase model (4PM) based oncomplementary electrical resistivity tomography (ERT) and seismic refractiontomography (SRT) in different positions of the Dos Lenguas rock glacier in theupper Agua Negra basin, Argentina. We derived vertical and horizontalsurface changes of the Dos Lenguas rock glacier, for the periods 2016–2017and 2017–2018 using drone-derived digital elevation models (DEMs). Interannualwater storage changes of −36 mm yr−1 and +27 mm yr−1derived from volumetric surface changes for the periods 2016–2017 and2017–2018, respectively, indicate that significant amounts of annualprecipitation can be stored in and released from the active rock glacier. Geophysical results show heterogeneous ice and water content with ice-richpermafrost and supra-, intra- and sub-permafrost water pathways at the endof the thaw period. Active layer and ice-rich permafrost control traps andpathways of shallow groundwater and thus regulate interannual storagechanges and water releases from the active rock glaciers in the dry mountaincatchment. The ice content of 1.7–2.0 × 109 kg in the activeDos Lenguas rock glacier represents an important long-term ice reservoir, asdo other ground ice deposits in the vicinity, if compared to surface icethat covers less than 3 % of the high mountain catchment.

Ice content and interannual water storage changes of an active rock glacier in the dry Andes of Argentina