Amy Leventer

TL;DR: It is suggested that the recent prolonged period of warming in the Antarctic Peninsula region, in combination with the long-term thinning of the Larsen B ice shelf has led to collapse of the ice shelf.

TL;DR: In this article, the authors present evidence for early and rapid carbon export from P. antarctica blooms to deep water and sediments in the Ross Sea, especially if projected climatic changes lead to an alteration in the structure of the phytoplankton community.

TL;DR: In this paper, the authors summarize the available data on climate variability and trends in the western Antarctic Peninsula (WAP) region and discuss these data in the context of long-term climate variability during the last 8000 years of the Holocene.

TL;DR: In this paper, the authors present a series of timeslice maps for 20 ka, 15 ka, 10 ka and 5 ka, including grounding line position and ice sheet thickness changes, along with a clear assessment of levels of confidence.

Abstract: Palmer Deep sediment cores are used to produce the first high-resolution, continuous late Pleistocene to Holocene time-series from the Antarctic marine system. The sedimentary record is dated using accelerator mass spectrometer radiocarbon methods on acid insoluble organic matter and foraminiferal calcite. Fifty-four radiocarbon analyses are utilized in the dating which provides a calibrated timescale back to 13 ka BP. Reliability of resultant ages on organic matter is assured because duplicates produce a standard deviation from the surface age of less than laboratory error (i.e., ±50 years). In addition, surface organic matter ages at the site are in excellent agreement with living calcite ages at the accepted reservoir age of 1260 years for the Antarctic Peninsula. Spectral analyses of the magnetic susceptibility record against the age model reveal unusually strong periodicity in the 400,–200 and 50-70 year frequency bands, similar to other high-resolution records from the Holocene but, so far, unique f...