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Sesonality of foraminiferal flux in sediment traps at Chatham Rise, SW Pacific: implications for paleotemperature estimates

journal contribution
posted on 2023-05-16, 23:30 authored by King, AL, Howard, W
Analysis of sediment traps located either side of the Subtropical Front east of New Zealand reveals a strong association between water masses and foraminiferal assemblages. The composition and timing of foraminiferal productivity is distinct between waters north and south of the front, and these di!erences are also re#ected in the assemblages of nearby core-tops. The sediment trap data indicate highly seasonal #ux patterns in this region, so sedimentary records may represent #ux during a particular season, rather than throughout the annual cycle. This pronounced seasonality has implications for our estimates of the annual temperature range based on faunal assemblages. This study shows that despite strong #ux seasonality the annual sea-surface temperature (SST) range is reliably estimated from the sediment trap foraminiferal assemblages by the modern analog technique. The successful estimation of the annual SST range also indicates that the annual #ux obtained from these sediment traps is representative of the longer term #ux preserved in surface sediments. Core-top assemblages from this region can therefore be directly related to modern sea-surface conditions, providing an analogue for interpreting past environmental change from fossil assemblages.

History

Publication title

Deep Sea Research Part I: Oceanographic Research Papers

Volume

48

Issue

7

Pagination

1687-1708

ISSN

0967-0637

Department/School

Institute for Marine and Antarctic Studies

Publisher

Pergamon-Elsevier Science Ltd

Place of publication

Oxford, England

Rights statement

The definitive version is available at http://www.sciencedirect.com

Repository Status

  • Restricted

Socio-economic Objectives

Understanding climate change not elsewhere classified

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