• Location (Physiographic Region): Central Spanish Pyrenees, headwater of Gállego River, near the Spain–France border. 
• Area: 0.33 km² 
• Elevation: Min. 2,056 m to Max. 2,340 m  
• Description (Physical–Ecological–Climatic Characteristics): Small subalpine catchment dominated by alpine meadows and small bare ground zones. Gentle slopes and lithology dominated by slates and sandstones with very reduced role of groundwater.
• Drainage/River System: Gállego River, which is one of the main tributaries of the Ebro River.
• Site History/Historical Context: It was created in 1986 with meteorological information of varying quality since 1996. Much better information after 2011 but reliable precipitation and runoff data is still an issue.
• Main Land Cover(s): Subalpine meadows.
• Lithology/Soils: Sandstones and slates.
• Mean Annual Temperature: 3°C
• Mean Total Annual Precipitation: 2000 mm
• Snow Characteristics: Deep snowpack mostly in isothermal conditions. 
• Years of Data: 12 (the most reliable) 

Observational Stations and Sites

Field Observation Campaigns and Other Measurements

Geospatial Data

Observational Data Availability 

• Revuelto, J., Azorin-Molina, C., Alonso-González, E., Sanmiguel-Vallelado, A., Navarro-Serrano, F., Rico, I., and López-Moreno, J. I.: Meteorological and snow distribution data in the Izas Experimental Catchment (Spanish Pyrenees) from 2011 to 2017, Earth Syst. Sci. Data, 9, 993–1005, https://doi.org/10.5194/essd-9-993-2017, 2017.   

The CRHM model has been applied several times to investigate snow processes and their sensitivity to environmental change.

• López-Moreno, J.I., Pomeroy, J.W., Revuelto, J. and Vicente-Serrano, S.M. (2013), Response of snow processes to climate change: spatial variability in a small basin in the Spanish Pyrenees. Hydrol. Process., 27: 2637-2650. https://doi.org/10.1002/hyp.9408 

• Revuelto, J., López-Moreno, J. I., Azorin-Molina, C., and Vicente-Serrano, S. M.: Topographic control of snowpack distribution in a small catchment in the central Spanish Pyrenees: intra- and inter-annual persistence, The Cryosphere, 8, 1989–2006, https://doi.org/10.5194/tc-8-1989-2014, 2014.
• López-Moreno, J. I., Revuelto, J., Fassnacht, S. R., Azorín-Molina, C., Vicente-Serrano, S. M., Morán-Tejeda, E., and Sexstone, G. A. (2015), Snowpack variability across various spatio-temporal resolutions, Hydrol. Process., 29, 1213–1224, https://doi.org/10.1002/hyp.10245  
• Revuelto, J., López-Moreno, J. I., & Alonso-González, E. (2021). Light and shadow in mapping alpine snowpack with unmanned aerial vehicles in the absence of ground control points. Water Resources Research, 57, e2020WR028980. https://doi.org/10.1029/2020WR028980
• Revuelto, J., Gómez, D., Alonso-González, E. et al. Intermediate snowpack melt-out dates guarantee the highest seasonal grasslands greening in the Pyrenees. Sci Rep 12, 18328 (2022). https://doi.org/10.1038/s41598-022-22391-x 

• Dr. Juan Ignacio López Moreno, Pyrenean Institute of Ecology-CSIC, ([email protected])
• Dr. Jesús Revuelto Benedí, Pyrenean Institute of Ecology-CSIC, ([email protected])