Estudio de la relación en la precipitación registrada por tres tipos de sensores y su variabilidad espacio-temporal en la cuenca del glaciar 15 del Antisana

Abstract

The project studied the relationship in the evaluation recorded by three types of sensors at 4900 m.a.s.l. between 2005-2017 and analyzes the spatio-temporal variability between 4200 and 4900 m.a.s.l. during 2002-2013. For each sensor, independent methods were applied using techniques, protocols and recommendations developed by the GREATICE project, WMO and INAMH for the Andean region. This allowed the creation of a good quality pluviometric database for the Antisana 15 glacier basin. The three sensors, despite being installed in the same place, have different accumulations of precipitation. In the case of Geonor, it must increase by 38% to take into account the effects of the wind. While the pluviograph must be increased by 52% and 19% to reach the magnitudes of the Geonor and totalizer rain gauge respectively, evidencing the underestimation of precipitation. Unfortunately, the Geonor and the ultrasound probe have no correspondence at any time step. The good Geonor-pluviograph ratio allowed us to estimate the correction factors to homogenize the precipitation. The space-temporal analysis with respect to the daily cycle shows that the precipitation is concentrated between 7:00 and 12:00 hours, a monthly level it presents two maximum peaks between February-July and October-December and at the annual level the P4 pluviograph is the one that records the highest rainfall. There is an increase in precipitation depending on the height, however, an inversion is observed in a pair of pluviographs (P4-P2) in the moor-moraine transition with a height difference of 330 m in 1.5 km distance.