Original abstract: We use a combination of aerial photogrammetry, satellite imagery, andd ifferential GPS mapping to quantify the volume of ice lost between AD 1962 and 1999 from three glaciers on Nevado Queshque in the Cordillera Blanca, Peru´ ( 101S). The largest averagedsurface lowering (thinning) occurredin the southwest aspect (22 m) andthe least in the eastern aspect (5 m). A heuristic sensitivity analysis indicates that 9.3Wm 2 was requiredto melt the total observedice loss and this can be explainedby sensible heat transfer relatedto a temperature rise of 1 1C, combinedwith a latent heat decrease relatedto a 0.14 g kg 1 increase in specific humidity. A first-difference analysis of temperature records from 29 stations in the Cordillera Blanca shows an average rising trend of 0.26 1C per decade over the 37 year interval, more than adequate to supply the hypothesized sensible heat t...

Original abstract: Discharge measurements, climate observations and hydrochemical samples gathered monthly (1998/99) in the Yanamarey and Uruashraju glacier-fed catchments of the Cordillera Blanca, Peru, permit an analysis of the glacier meltwater contribution to stream-flow. These glacier catchments feed the Río Santa, which discharges into the Pacific Ocean. Based on a water-balance computation, glacier melt contributes an estimated 35% of the average discharge from the catchments. For comparison, a volumetric end-member mixing model of oxygen isotopes shows glacier melt contributes 30–45% to the total annual discharge. Based on stream geochemistry, discharge from the Yanamarey glacier catchment provides 30% of the annual volume discharged from the Querococha watershed, which is <10% glacierized. By analogy, the larger Río Santa watershed, also <10% glacierized, receives at least 1...