Identification

Title

A nutrient effect on the TEX86 paleotemperature proxy

Abstract

The TEX86 paleotemperature proxy is widely used to reconstruct ocean surface temperatures over the past 100 million years. However, archaeal culture experiments show that nutrient stress elevates TEX86 values by increasing glycerol dialkyl glycerol tetraether (GDGT) cyclization. Here, we demonstrate that this â€œnutrient effectâ€ is also recorded in sedimentary GDGTs. Using an expanded coreâ€top database, we find a significant negative correlation between TEX86 and nitrate concentrations (Ï = 0.31; P < 0.001) once the thermal effect is removed. There are stronger correlations (Ï 0.73 to 0.91; P < 0.001) in regions with steep nitrate gradients. Comparisons between TEX86 and UKÊ¹37 â€based reconstructions from the Arabian Sea and Tasman Sea suggest that nutrient stress influenced GDGT distributions during glacialâ€interglacial cycles. Our findings underscore the need to account for nutrient effects when applying TEX86 paleothermometry.

Resource type

document

Resource locator

Unique resource identifier

code

https://n2t.net/ark:/85065/d7qc07zw

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

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keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

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East bounding longitude

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Temporal reference

Temporal extent

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End position

Dataset reference date

date type

publication

effective date

2025-06-28T00:00:00Z

Frequency of update

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Conformity

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Use constraints

Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact