Northwestern Gulf of Mexico Holocene G. ruber geochemistry from 2010-GB2-GC1

• Main Authors: Thirumalai, Kaustubh, Richey, Julie N, Quinn, Terrence Michael
• Format: Other/Unknown Material
• Language: English
• Published: PANGAEA 2021
• Subjects: Foraminifera; G. ruber; Geochemistry; Holocene; Paleoceanography; Salinity; Temperature; δ¹⁸Osw; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.935987; https://doi.org/10.1594/PANGAEA.935987

This dataset contains stable oxygen isotope, radiocarbon, and magnesium-to-calcium ratios measured in G. ruber (white) from a core in the northwestern Gulf of Mexico (Garrison Basin). The dataset also contains the inverted temperature, δ¹⁸O-sw (ice-volume corrected), and salinity values using the PSU Solver Algorithm. A Holocene composite of these parameters is provided for the Garrison Basin with higher-resolution (and previously published) late Holocene records from multi-cores. Here is the abstract from the paper: The Gulf of Mexico (GoM) is an integral component of oceanic circulation in the North Atlantic and helps facilitate poleward heat transport in the Western Hemisphere. Regionally, it serves as a key source of moisture for much of North America. Modern patterns of sea-surface temperature (SST) and salinity in the GoM are influenced by the Loop Current, its eddy-shedding dynamics, and the ensuing interplay with coastal processes. Here we present sub-centennial-scale records of SST and the stable oxygen isotope composition of seawater (δ¹⁸Osw; a proxy for changes in salinity) over the past 11,700 years using planktic foraminiferal geochemistry in sediments from the Garrison Basin, northwestern GoM. We measured δ¹⁸O and magnesium-to-calcium ratios in tests of Globigerinoides ruber (white variety) to generate quantitative estimates of past sea-surface conditions. Our results replicate and extend late Holocene reconstructions from the Garrison Basin, which we then use to create Holocene composites of SST and δ¹⁸Osw. We find considerable centennial and millennial-scale variability in both SST and δ¹⁸Osw, although their evolution over the Holocene is distinct. Whereas mean-annual SSTs display pronounced millennial-scale variability, δ¹⁸Osw exhibits a secular trend spanning multiple millennia and indicates increasing sea-surface salinity in the northwestern GoM since the early Holocene. We then synthesize available Holocene records from across the GoM, and alongside the Garrison Basin composite, uncover ...