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

By Henry F. Diaz

Glaciers within the Andes are fairly vital normal information of current and previous climatic and environmental alterations, in major half due to the N-S pattern of this topographic barrier and its effect at the atmospheric movement of the southern hemisphere. powerful gradients within the seasonality and quantity of precipitation exist among the equator and 30° S. huge adjustments in volume east and west of the Andean divide additionally happen, in addition to a metamorphosis from tropical summer time precipitation (additionally transformed via the seasonal shift of the movement belts) to wintry weather 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 desolate tract inside of this axis responds so much sensitively to the smallest adjustments in powerful moisture. a massive hydro-meteorological function on a seasonal to inter-annual time-scale is the incidence of EN SO occasions, which strongly keep watch over the mass stability of glaciers during this sector (e. g. , Wagnon et ai. , 2001; Francou et ai. , in press). The precipitation development is a crucial issue for the translation of climatic and environmental files extracted from ice cores, simply because a lot of this data is said to stipulations on the genuine time of precipitation, and this is often specifically so for reliable isotope files. numerous ice cores have lately been drilled to bedrock during this region. From Huascanin (Thompson et ai. , 1995), Sajama (Thompson et ai.

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Figure 11 depicts a time series of annual surface temperatures departure from a 1951-1980 reference mean for the region where the climatological annual mean temperature is within ± I °C of freezing (largely in 46 HENRY F. DIAZ ET AL. - 7000 5000 -3000 150-125-100-75 SO - 1000 25 10 10 2000 25 4000 SO 6000 75 100 125 150 Figure 7. Map showing net changes in (top panel) surface area (km 2) above the FLS, and (bottom panel) expressed in percent of the long-term mean for each grid area. Data are for the month of April.

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