WCRP VAMOS/CORDEX LACII - Workshop

Universidad Nacional Agraria La Molina. Facultad de Ciencias. Departamento Académico de Ingeniería Ambiental, Física y Meteorología

From January through March 2017, a series of extreme precipitation events occurred in coastal Peru, causing severe floods with hundreds of human casualties and billions of dollars in economic losses. The extreme precipitation was a result of unusually strong recurrent patterns of atmospheric and oceanic conditions, including extremely warm coastal sea surface temperatures (SST) and weakened trade winds. These climatic features and their causal relationship with the Peruvian precipitation were examined. Diagnostic analysis and model experiments suggest that an atmospheric forcing in early 2017, which was moderately linked to the Trans-Niño Index (TNI), initiated the local SST warming along coastal Peru that later expanded to the equator. In January 2017, soil moisture was increased by an unusual expansion of Amazonian rainfall. By March, localized and robust SST warming provided positive...

Iniciativa del Gobierno peruano, liderado por el Ministerio del Ambiente y el Servicio Nacional de Meteorología e Hidrología del Perú (Senamhi).

Precipitation deficits remain a concern to the rural population in the southern Peruvian highlands and knowledge about their occurrence is lacking because of scarce data availability. For mountainous regions with sparse station networks, reanalyses can provide valuable information; however, known limitations in reproducing precipitation are aggravated due to unresolved topographical effects. In this study, we assess in a first step the representation of precipitation during the rainy season (January–February–March) in seven reanalysis data sets in comparison to a newly generated gridded precipitation data set for Peru. In a second step, we assess summer precipitation deficits in Peru during the second half of the 20th century. In the reanalyses data sets, we find biases strongly influenced by the topography of the models and low correlations for the rainy season. Thus, reanalyses do ...

Se estima que para el año 2080 la temperatura en la región amazónica aumentará en 4°C, lo que tendrá implicancias directas en el equilibrio de sus ecosistemas. Teniendo en cuenta que el 50 por ciento de las precipitaciones en la Amazonía son producidas por convección, es decir, son provocadas por las transferencias de aire caliente y frío en la región, siendo en gran medida efecto de la autorregulación de una región dominada por extensas zonas de bosque húmedo, el problema del cambio climático, unido a los procesos progresivos de deforestación, se convierte en uno de los problemas más preocupantes para la región y el mundo. Sin duda alguna, esta capacidad de autorregulación ya se está viendo afectada. Hay que tener en cuenta que un 40 o 45 por ciento de deforestación en la Amazonía provocaría un desastre irreparable de implicancias mundiales. La presente publicació...