Mg/Ca ratios of Neogloboquadrina pachyderma (s) and Globigerina bulloides in Irminger Sea sediment trap time series ...

iven the importance of high-latitude areas in the ocean-climate system, there is need for a paleothermometer that is reliable at low temperatures. Here we assess the applicability of the Mg/Ca-temperature proxy in colder waters (5-10 °C) by comparing for the first time the seasonal Mg/Ca and d18O cy...

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Bibliographic Details
Main Authors: Jonkers, Lukas, Jimenez-Amat, Patricia, Mortyn, P Graham, Brummer, Geert-Jan A
Format: Dataset
Language:English
Published: PANGAEA 2013
Subjects:
Event label
Sample code/label
DATE/TIME
Date/time end
DEPTH, water
Neogloboquadrina pachyderma, Magnesium/Calcium ratio
Globigerina bulloides, Magnesium/Calcium ratio
Trap, sediment
Inductively coupled plasma - mass spectrometry ICP-MS
Irminger Sea
Neogloboquadrina pachyderma
North Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.816232
https://doi.pangaea.de/10.1594/PANGAEA.816232
Description
Summary:iven the importance of high-latitude areas in the ocean-climate system, there is need for a paleothermometer that is reliable at low temperatures. Here we assess the applicability of the Mg/Ca-temperature proxy in colder waters (5-10 °C) by comparing for the first time the seasonal Mg/Ca and d18O cycles of N. pachyderma (s) and G. bulloides using a sediment trap time-series from the northern North Atlantic. While both species show indistinguishable seasonal d18O patterns that clearly track the near surface temperature cycle, their Mg/Ca are very different. G. bulloides Mg/Ca is high (2.0-3.1 mmol/mol), but varies in concert with the seasonal temperature cycle. The Mg/Ca of N. pachyderma (s), on the other hand, is low (1.1-1.5 mmol/mol) and shows only a very weak seasonal cycle. The d18O patterns indicate that both species calcify in the same depth zone. Consequently, depth habitat differences cannot explain the contrasting Mg/Ca patterns. The elevated Mg/Ca in pristine G. bulloides might be due to the ... : Supplement to: Jonkers, Lukas; Jimenez-Amat, Patricia; Mortyn, P Graham; Brummer, Geert-Jan A (2013): Seasonal Mg/Ca variability of N. pachyderma (s) and G. bulloides: Implications for seawater temperature reconstruction. Earth and Planetary Science Letters, 376, 137-144 ...

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