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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, WAnalysis 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 PapersVolume
48Issue
7Pagination
1687-1708ISSN
0967-0637Department/School
Institute for Marine and Antarctic StudiesPublisher
Pergamon-Elsevier Science LtdPlace of publication
Oxford, EnglandRights statement
The definitive version is available at http://www.sciencedirect.comRepository Status
- Restricted