Late Holocene climate change recorded in proxy records from a Bransfield Basin sediment core, Antarctic Peninsula
The glacimarine environment of the Antarctic Peninsula region is one of the fastest warming places on Earth today, but details of changes in the recent past remain unknown. Large distances and widespread variability separate late Holocene palaeoclimate reconstructions in this region. This study focuses on a marine sediment core collected from ca. 2000 m below sea level in the Central Bransfield Strait that serves as a key for understanding changes in this region. The core yielded a high sedimentation rate and therefore provides an exceptional high-resolution sedimentary record composed of hemipelagic sediment, with some turbidites. An age model has been created using radiocarbon dates that span the Late Holocene: 3560 cal yr BP to present. This chronostratigraphic framework was used to establish five units, which are grouped into two super-units: a lower super-unit (3560–1600 cal yr BP) and an upper super-unit (1600 cal yr BP–present), based on facies descriptions, laser particle size analysis, x-ray analysis, multi-sensor core logger data, weight percentages and isotopic values of total organic carbon and nitrogen. We interpret the signal contained within the upper super-unit as an increase in surface water irradiance and/or shortening of the sea-ice season and the five units are broadly synchronous with climatic intervals across the Antarctic Peninsula region. While the general trends of regional climatic periods are represented in the Bransfield Basin core we have examined, each additional record that is obtained adds variability to the known history of the Antarctic Peninsula, rather than clarifying specific trends.
Keywords: Antarctic Peninsula; palaeoclimate; Holocene; marine; isotopes.
(Published: 11 June 2014)
Citation: Polar Research 2014, 33, 17236, http://dx.doi.org/10.3402/polar.v33.17236

Professor Tim Naish has been awarded the 2014 Muse Prize, for his outstanding research in understanding Antarctica’s response to past and present climate change and the role of Antarctica’s ice sheets in global sea-level change through time. He led the first season of the ambitious and highly successful Antarctic Drilling Program (ANDRILL) where his international team pioneered innovative drilling technology to obtain sedimentary records of the past 13 million years, paving the way for further successful drilling in previously inaccessible ice-covered areas. As Chair of the ANDRILL Steering Committee, he continued to be actively involved in overseeing the programme, including securing funding for the next phase. More recently, he has played an influential role in the process of translating science into policy as a lead author on the Paleoclimate chapter of the 5th Assessment Report of the Intergovernmental Panel on Climate Change. He is currently Director of the Antarctic Research Centre, Victoria University of Wellington, which continues to develop and has more than trebled its capacity under his direction.
The National Snow and Ice Data Center (NSIDC) is pleased to announce the release of the MODIS Mosaic of Antarctica 2008-2009 Image Map (MOA2009). This data set consists of two cloud-free digital image maps that show
The Sustaining Arctic Observing Networks (