Understanding the transport and deposition of cosmogenic isotope 10 Be is vital for application data to infer past changes solar activity, reconstruct Earth’s magnetic field intensity climate change. Here, we use from Greenland ice cores, namely NEEM GRIP identify factors controlling its distribution. After removing effects geomagnetic on radionuclide production rate, results expose imprints 20...

The climatic and vegetation history of a western Amazonian cloud forest is documented in a continuous pollen record spanning the full last glacial period between 43.5 and 22k cal. yr BP. The chronology for this record is based on eight radiocarbon dates yielding a low-resolution pollen analysis for the region. A bioclimatic envelope model was generated on the basis of modern altitudinal distrib...

Sea level change during the Quaternary is primarily a consequence of the cyclic growth and decay of ice sheets, resulting in a complex spatial and temporal pattern. Observations of this variability provide constraints on the timing, rates, and magnitudes of the changes in ice mass during a glacial cycle, as well as more limited information on the distribution of ice between the major ice sheets...

[1] During the last glacial period, eustatic lowering of sea level exposed large areas of continental shelves that are presently submerged. By a series of direct numerical simulations we investigate the sensitivity of the atmosphere-ocean system to exposure of the extensive Sunda shelf in the western tropical Pacific. We demonstrate that this specific forcing factor triggers increased convectio...

[1] A class ofMartian impact craters with particularly unusual ejecta characteristics (double-layered ejecta (DLE) craters) are preferentially located in the midlatitudes in both hemispheres of Mars. Unlike today, decameters thick deposits of snow and ice occupied these same latitudes for significant periods during the Amazonian period. We assess the hypothesis that the unusual double-layer mor...

Precise characterization of hydroclimate variability in Amazonia on various timescales is critical to understanding the link between climate change and biodiversity. Here we present absolute-dated speleothem oxygen isotope records that characterize hydroclimate variation in western and eastern Amazonia over the past 250 and 20 ka, respectively. Although our records demonstrate the coherent mill...