Abstract
Up to 1980 Quaternary pollen analysis in the southern part ofSouth Americahas mainly concentrated on bogs and lake sediments in humid regions, i.e. the Patagonian Andes. But the vast dry lands of easternPatagoniacovered with steppe type vegetation, dwarf-shrubs in the semi-deserts and xerophytic Monte in the north-eastern parts also offer paleoecological archives such as dry lakes and salt-lakes in closed basins. During the last 15 years the author studied many profiles in this region not only for pollen but also other sediment proxies as i.e. salt, organic material and grain-size. One aim of the studies is to reconstruct climate parameters quantitatively by using multivariate statistics on the basis of correlations between modern pollen spectra and recent climate data. Concentrating on North-Patagonia it is now possible to reconstruct the yearly amount of precipitation for the last c. 14 ka BP. These results were interpreted in terms of paleo-circulation patterns. Ongoing investigation in southern Patagonia (Volcanic Region of Pali Aike) and the dry lands in north-west Argentina (Provinces of Salta and Jujuy) will provide further information about climate changes in the past, which can be used for the "scaling" of future climate models.
Highlights
North-Patagoniait isnow possihlo to reconstruct the yearly amount ofprecipitation for thelast e. 14ka BP.These of results were interpreted in terms of paleo-circulation ~atternsO. n-~ o i.nin~vestimtion in southern Patagonia (Volcanic Region Pali hike) and ti); dry iands in north-west Argentina (ProvLes of Saita and ~ujuyw) ill provide further information ahout climate changes in the past, which can be used for the '"scaling"of future climate models
Ocurre s61o e n invierno, bajos valores de Cuando 10s vientos del oeste se ubican en una precipitaci6n anual resultan en 10ssectores oeste posici6n mas septentrional durante todo el aiio, y central de Patagonia node (regi6n 1).Durante ocurre u n aumento de precipitaci6n
Summary
North-Patagoniait isnow possihlo to reconstruct the yearly amount ofprecipitation for thelast e. 14ka BP.These of results were interpreted in terms of paleo-circulation ~atternsO. n-~ o i.nin~vestimtion in southern Patagonia (Volcanic Region Pali hike) and ti); dry iands in north-west Argentina (ProvLes of Saita and ~ujuyw) ill provide further information ahout climate changes in the past, which can be used for the '"scaling"of future climate models. En diirecci6n 0-E, la precipitaci6n anual menores de 3.000 mm en Ias cimas de la regi6n del norte de la Cordillera Patagbnica decrece ahrnplamente a valores menores de 400 mm en el piedomonte y altas mesetas del oeste y a 80-150 mm hacia el este de Patagonia.
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