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Climate Variability and Change in High Elevation Regions: by Henry F. Diaz

By Henry F. Diaz

Glaciers within the Andes are rather very important normal data of current and previous climatic and environmental alterations, in major half end result of the N-S development of this topographic barrier and its impression at the atmospheric flow of the southern hemisphere. robust gradients within the seasonality and volume of precipitation exist among the equator and 30° S. huge modifications in volume east and west of the Andean divide additionally take place, in addition to a metamorphosis from tropical summer season precipitation (additionally changed via the seasonal shift of the move belts) to iciness precipitation within the west wind belt (e. g. , Yuille, 1999; Garraud and Aceituno, 2001). The so-called 'dry axis' lies among the tropical and additional­ tropical precipitation regimes (Figure 1). The excessive mountain wasteland inside of this axis responds such a lot sensitively to the smallest adjustments in powerful moisture. a massive hydro-meteorological function on a seasonal to inter-annual time-scale is the prevalence of EN SO occasions, which strongly keep an eye on the mass stability of glaciers during this region (e. g. , Wagnon et ai. , 2001; Francou et ai. , in press). The precipitation trend is a crucial issue for the translation of climatic and environmental documents extracted from ice cores, simply because a lot of this knowledge is said to stipulations on the genuine time of precipitation, and this can be in particular so for solid isotope documents. numerous ice cores have lately been drilled to bedrock during this sector. From Huascanin (Thompson et ai. , 1995), Sajama (Thompson et ai.

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