Estudiantes de Paleoecología y Paleoclima

Millennial-scale variability in Southern Hemisphere westerly wind activity over the last 5000 years in SW Patagonia

P.I. Moreno, J.P. François, R.P. Villa-Martínez, C.M. Moy

ABSTRACT.- Here we report results from a high-resolution palynological record and stratigraphic/geochronologic data related to a Neoglacial event in Torres del Paine National Park, southern Chile (51S, 71W), to investigate climatic variations in Southwest Patagonia during the last 5000 years. The record reveals a stepwise expansion of Nothofagus-dominated woodlands and forests with discrete pulses at 4400, 2900, 1300, and 570 cal yr BP. Superimposed upon this trend we identify a relative opening of the woodlands

Chironomid and pollen evidence for climate fluctuations during the Last Glacial Termination in NW Patagonia

J.I. Massaferro, P.I. Moreno, G.H. Denton, M. Vandergoes, A. Dieffenbacher-Krall

ABSTRACT.- We present chironomid and pollen records from the Huelmo site (w41300S), NW Patagonia, to examine in detail the timing and structure of climate changes during the Last Glacial Termination in the southern mid-latitudes. The chironomid record has the highest temporal and taxonomic resolution for this critical interval, and constitutes the first account of midge faunas at the culmination of the Last Glacial Maximum (LGM) for the region. The chironomid record suggests cold and

The Southern Westerlies during the last glacial maximum in PMIP2 simulations

Maisa Rojas Æ Patricio Moreno Æ Masa Kageyama Æ Michel Crucifix Æ Chris Hewitt Æ Ayako Abe-Ouchi Æ Rumi Ohgaito Æ Esther C. Brady Æ Pandora Hope

Abstract The Southern Hemisphere westerly winds are an important component of the climate system at hemispheric and global scales. Variations in their intensity and latitudinal position through an ice-age cycle have been proposed as important drivers of global climate change due to their influence on deep-ocean circulation and changes in atmospheric CO2. The position, intensity, and associated climatology of the southern westerlies

Glacial dynamics in southernmost South America during Marine Isotope Stage 5e to the Younger Dryas chron: a brief review with a focus on cosmogenic nuclide measurements

MICHAEL R. KAPLAN, PATRICIO I. MORENO and MAISA ROJAS

ABSTRACT: The timing of major glacial changes between Marine Isotope Stage (MIS) 5e and the Younger Dryas chron (YD) in southern South America is reviewed. Focus is placed on studies that use cosmogenic nuclide measurements. However, other dated records and modelling results are also discussed to provide the broader glacial geological context. Limits on the state of glacial geologic knowledge are examined and suggestions

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Abstract

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Barrows, T. T., S. J. Lehman, et al. (2007). "Absence of Cooling in New Zealand and the Adjacent Ocean During the Younger Dryas Chronozone." Science 318: 86-89.

Stott, L., A. Timmermann, et al. (2007). "Southern Hemisphere and Deep-Sea Warming Led Deglacial Atmospheric CO2 Rise and Tropical Warming." Science 318: 435-438.