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Using high-precision ice core measurements of CO2, ?13C-CO2, CH4, and N2O, this study provides carbon isotope constraints on a sizeable, centennial-scale CO2 jump at the onset of Marine Isotope Stage 9 (MIS 9). The very end of the Heinrich stadial (HS) characterizing Termination IV (T-IV, ca.
The last glacial termination was characterised by millennial-scale episodes of warming and cooling that appear offset between the hemispheres. It has been proposed that this bi-polar seesaw is the result of climate system feedbacks. A key debate, which remains unresolved…
Peter I Island is situated in the Bellingshausen Sea, a region that has experienced considerable climate change in recent decades. Warming sea surface temperatures and reduced sea ice cover have been accompanied by warming surface air temperature, increased snowfall…
The variations of atmospheric ?14C over the past two millennia are classically attributed to changes in its production rate in the upper atmosphere, which in turn is related to changes in solar activity and the Earth's magnetic field. However…
Although many Quaternary records have allowed the study of major glacial-interglacial change in the … Southern Ocean, Holocene records from deep-sea cores are few and far between and are currently … limited to the South Atlantic. Low sedimentation rates combined with deep seafloors…
Ice core records from Antarctic and Greenland have revealed that the last deglaciation (ca. 19, 000 to 11, 000 years before present) was accompanied by an 80 ppmv increase in atmospheric CO2 and a sequence of large, hemispheric climate variations.
The natural variability of the Weddell Sea variety of Antarctic Bottom Water (AABW) is examined in … a long-term integration of a coupled climate model. Examination of passive tracer concentrations suggests … that the model AABW is predominantly sourced in the Weddell Sea.
Sea ice observations are difficult to obtain in sufficient temporal and spatial resolution. Several observational techniques have been used to build a sea ice record of ice … concentration, ice extent, and ice thickness among other things. Satellite measurements are … varied in their capabilities…
Sea ice freeboard distributions are detennined from ICESat measurements of mean surface … elevations with a range precision of -2 cm over 70 m footprints spaced by 170 m along … track. Freeboard (snow cover plus sea ice) distributions are constructed from elevation … measurements within :i:
We present sea surface temperature (SST) records with centennial-scale resolution from the Bay of Plenty, north of New Zealand. Foraminiferal assemblage-based paleo-SST estimates provide a deglacial record of SST … since 16.5 14C ka. Average Holocene SSTs are 15.6C for winter and 20.3C for summer…
The Southern Hemisphere westerlies in the southwest Pacific are known to have waxed and waned numerous times during the last … two glacial cycles, though even semi-continuous histories of the westerlies extend back no more than about 20,000 years.