Details of Award

NERC Reference : NE/J006548/1

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Depositional patterns and records in sediment drifts off the Antarctic Peninsula and West Antarctica

Grant Award

Principal Investigator:: Dr RD Larter, NERC British Antarctic Survey, Science Programmes
Co-Investigator:: Dr C Hillenbrand, NERC British Antarctic Survey, Science Programmes
Co-Investigator:: Dr AGC Graham, Cardiff University, Sch of Earth and Environmental Sciences
Grant held at:: NERC British Antarctic Survey, Science Programmes

Science Area:: Earth; Marine
Overall Classification:: Earth

Science Classification details

ENRIs:: Environmental Risks and Hazards; Global Change
Science Topics:: Palaeoenvironments; Palaeoenvironments; Quaternary Science; Sediment/Sedimentary Processes; Ocean Circulation

Abstract:: The biggest uncertainty in predictions of sea-level rise is what the contribution will be from the great ice sheets on Antarctica and Greenland as climate warms. The West Antarctic Ice Sheet and the Antarctic Peninsula Ice Sheet are the cause of greatest concern, as they are showing signs of significant ice loss and there are theoretical reasons for expecting them to be most vulnerable. Important sources of information for helping to predict how these ice sheets will change as climate warms are records of their response to past climate changes contained in sea bed sediments around Antarctica. Such records extend further back in time than ice cores from the ice sheets themselves. They can also show how the margins of the ice sheets interacted with changes in ocean temperature and circulation, which recent studies have identified as having an important influence on ice sheets. Although sedimentary records in the shallow seas close to Antarctica have been periodically disturbed or removed by past expansions of the ice sheets, there are places in the nearby deep ocean where sediments have accumulated continuously over millions of years. The international Integrated Ocean Drilling Program is considering a proposal to send a drilling ship to collect long sediment cores from some of these places. However, before this is done additional survey data are needed to find the sites that will provide the most continuous, detailed records and to make sure that it will be safe to drill those sites. In this research proposal we are seeking funding to collect this essential survey data. On the same expedition we also propose to collect short sediment cores for pilot studies to confirm that the analytical methods we intend to apply to the longer drill cores will provide reliable information about sediment ages, past climate and past ice sheet behaviour. One of the major difficulties in studying sediment records from the sea bed around Antarctica has been obtaining reliable ages from the sediments. This is because the types of microfossils that are analysed to determine sediment ages in drill cores from most of the world's oceans are rare or absent in many sediment cores collected near Antarctica. By carrying out detailed survey and studying short cores we hope to identify sites where there are sufficient numbers of these microfossils to apply the standard dating techniques. We also plan to test whether a new method of dating sediments that is based on analysis of their magnetic properties will work in the area of the proposed drill sites. It has recently been shown that in many places analysis of the magnetic properties of sea bed sediments can provide records of past changes in the intensity of the Earth's magnetic field, and comparison of these records to well-dated reference records allows ages to be assigned to sediments throughout a core. By comparing ages obtained using this method with ones obtained from microfossils, where they are present, we will be able to find out how well the magnetic dating method works in the study area. If the magnetic method works well, we will be able to establish detailed age models for drill cores without dependence on microfossils, which will greatly extend the area that can be studied by drilling and allow more detailed records of past changes to be derived from the drill cores.

Period of Award:: 1 Oct 2014 - 31 Mar 2017
Value:: £282,014 Lead Split Award

(FY details)

Authorised funds only

NERC Reference:: NE/J006548/1
Grant Stage:: Completed
Scheme:: Directed (RP) - NR1
Grant Status:: Closed
Programme:: UK IODP Phase2

This grant award has a total value of £282,014

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FDAB - Financial Details (Award breakdown by headings)

DI - Other Costs	Indirect - Indirect Costs	DA - Investigators	DI - Staff	DA - Estate Costs	DI - T&S
£19,737	£100,242	£80,516	£20,738	£25,314	£35,466

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