000012802 001__ 12802
000012802 037__ $$a652
000012802 041__ $$aEnglish
000012802 100__ $$aMasiokas, M. H.
000012802 100__ $$aVillalba, R.
000012802 100__ $$aLuckman, B. H.
000012802 100__ $$aLascano, M. E.
000012802 100__ $$aDelgado, S.
000012802 245__ $$a20th century glacier recession and regional hydroclimatic changes in north western Patagonia
000012802 260__ $$c2007
000012802 260__ $$b
            
000012802 490__ $$aArticle
000012802 507__ $$aMFOLL
000012802 511__ $$aCrysparticle
000012802 511__ $$aCrysparticle
000012802 511__ $$aCryosphere
000012802 520__ $$aThis paper documents the occurrence of significant glacier and hydroclimatic changes in northwestern Patagonia during the past century. Drastic, widespread glacier recession is documented by repeat photography of some of the earliest glacier images from southern South America. Linear trends in regionally-averaged annual and seasonal temperature and precipitation records indicate significant warming and decreasing precipitation over the 1912-2002 interval. A climatic index is developed, based on winter precipitation and summer temperature records, that mimics glacier mass balance relationships and shows a strong negative trend which agrees with the drastic glacier recession shown by the photographic comparisons. Short positive periods of this climatic index broadly correspond with known evidence of glacier advances in the region. Regionally-averaged mean annual streamflow records east of the mountains were used in an independent verification check of the climatic series used in this study. This regional runoff record shows a strong negative trend, remarkable similarities with the climatic index, and highly significant positive (negative) correlations with the regional precipitation (temperature) series. This highlights the existence of a strong, regionally coherent hydroclimatic signal across this region and supports the utility of these records as environmental indicators for northwestern Patagonia between ca. 38° and 45°S. Given the significant socio-economic importance of rivers and glaciers in this area, further research is needed to evaluate the full range of natural hydroclimate variability and improve understanding of potential impacts of the future warmer and drier climates projected for this region.
000012802 653__ $$aAndes
000012802 653__ $$aArgentina
000012802 653__ $$aChile
000012802 653__ $$aclimate fluctuations
000012802 653__ $$aglaciers
000012802 653__ $$ahydrology
000012802 650__ $$aClimate change
000012802 650__ $$aCryosphere
000012802 650__ $$aGlaciers
000012802 691__ $$aClimate change
000012802 691__ $$aCryosphere
000012802 691__ $$aGlaciers
000012802 773__ $$pGlobal and Planetary Change
000012802 8564_ $$uhttp://lib.icimod.org/record/12802/files/652.pdf
000012802 980__ $$aARTICLE