Calibration of past water temperature in the Sea of Japan based on Mg/Ca of ostracode shells of two shallow marine species in the genus Cytheropteron

Yamada, Keigo; Irizuki, Toshiaki; Ikehara, Ken; Okamura, Kei

doi:10.1016/j.palaeo.2014.05.042

Cited by 5 publications

(3 citation statements)

References 45 publications

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“…Compared to Krithe adults, Polycope specimens generally show higher Mg/Ca ratios (27.3–69.4 mmol mol −1 ), higher Sr/Ca ratios (2.0–4.9 mmol mol −1 ), and lower concentrations of Ca (with an average of ∼263 ug L −1 ). These higher Mg/Ca values are similar to those of other ostracode genera from lower latitudes, such as Loxoconcha and Cytheropteron (Yamada et al., 2014). The average Polycope Mg/Ca standard deviation across all sediment layers is 4.5 mmol mol −1 , compared to 1.1 mmol mol −1 calculated from Mg/Ca ratios in Krithe adults (Table 2).…”

Section: Resultssupporting

confidence: 81%

Intra‐Valve Elemental Distributions in Arctic Marine Ostracodes: Implications for Mg/Ca and Sr/Ca Paleothermometry

Rodríguez

Doherty

Man

et al. 2021

Geochem Geophys Geosyst

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Reconstructing intermediate and bottom‐water temperature in the Arctic Ocean is key for understanding paleoclimatic phenomena, such as the region's interactions with warm Atlantic waters, stratification, and sea‐ice dynamics. However, benthic proxy archives are sparse throughout the Arctic circle compared to lower latitudes. Trace‐element ratios (E/Ca) derived from ostracodes, a group of bivalved microscopic crustaceans, have shown promise in this regard. Samples for E/Ca measurements typically require rigorous cleaning prior to analysis, and signs of contamination are routinely monitored through the presence of other trace elements such as Al, Fe, and Mn, which are associated with suspected sources of overprinting. However, there has not yet been an intra‐valve investigation of all of these trace elements, which may hinder our ability to effectively identify geochemical overprinting. Here, we present several elemental concentration and E/Ca ratio measurements in two ostracode genera, Krithe and Polycope, extracted from Chukchi Sea sediment samples. We further investigate the intra‐valve distribution of elements within single shells of adult and juvenile specimens using electron probe microanalysis (EPMA). Our findings suggest that brushing and bleach treatments may not be effective for completely eliminating clays from the edges of valves, which can bias paleoclimatologically relevant trace‐element proxies such as Mg/Ca ratios, particularly in the case of incomplete or small samples with low amounts of calcite material. In addition, we report the first trace‐element data from the genus Polycope, which shows potential as a new Arctic paleotemperature archive.

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Section: Resultssupporting

confidence: 81%

Intra‐Valve Elemental Distributions in Arctic Marine Ostracodes: Implications for Mg/Ca and Sr/Ca Paleothermometry

Rodríguez

Doherty

Man

et al. 2021

Geochem Geophys Geosyst

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“…These species are known across the northern Indian Ocean from the Red Sea to the South China Sea living at water depths ranging from ~50 up to 1000 m (Bonaduce et al, 1976;Whatley and Zhao, 1987;Zhao et al, 2000). Cytheropteron is a marine epifaunal and opportunistic genus with worldwide distribution and includes shallow and deep-water species (Zhao et al, 2000;Stepanova et al, 2004;Yasuhara et al, 2009Yamada et al, 2014;Jöst et al, 2018). They are fast-moving ostracods able to crawl and swim just above the seafloor where they are known to prey or scavenge for food, e.g., polychaetes (Hartmann, 1975).…”

Section: The Ostracod Faunamentioning

confidence: 99%

Ostracod response to monsoon and OMZ variability over the past 1.2 Myr

Zarikian

Nadiri

Alonso-García

et al. 2022

Marine Micropaleontology

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“…Element / calcium ratios (E/Ca) of secreted biogenic calcium carbonate by marine organisms, such as foraminifera and corals, have been used as proxies for past environmental marine parameters (Hendy et al, 2002;Lea, 2003;Lea and Boyle, 1989;Linsley et al, 2000;Martin et al, 2002). Mg/Ca in foraminifera and Sr/Ca in corals have been frequently used to reconstruct water temperatures (Beck et al, 1992;Cohen et al, 2001Cohen et al, , 2002Lea, 2003;Rosenthal et al, 2006;Sinclair et al, 1998;Yu and Elderfield, 2008). In addition, Mg/Ca of ostracod shells has also provided valuable information about water temperatures (Chivas et al, 1983(Chivas et al, , 1986aDe Deckker and Forester, 1988;Dwyer et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Calibration of Mg ∕ Ca and Sr ∕ Ca in coastal marine ostracods as a proxy for temperature

Rodríguez¹,

Not

2021

Biogeosciences

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Abstract. The Mg/Ca and Sr/Ca ratios of marine shells have been widely used in environmental paleoreconstructions to understand past marine conditions. Temperature calibrations to ostracod Mg/Ca ratios are known to be species-specific but only available for a few species, despite the large number of known ostracod species. Here, we develop temperature calibrations for two shallow marine ostracods, Sinocytheridea impressa and Neomonoceratina delicata, using modern sediment samples. Our results show that adult specimens of these two species might be useful as a paleothermometer. We observed significant correlations using the Mg/Ca ratios of both species to the annual (Mg/CaS. impressa=3.7 ⋅ T−62.7; Mg/CaN. delicata=1.6 ⋅ T−16.8) and April (Mg/CaS. impressa=2.8 ⋅ T−39.2; Mg/CaN. delicata=1.6 ⋅ T−15.7) temperatures. The correlation of temperature to the Mg/Ca ratio of S. impressa is more significant and therefore should be preferred for paleoreconstructions. Re-analysis from satellite data allows us to validate our temperature calibration to an extended area around the Pearl River estuary. Our results show that Mg/Ca of S. impressa and N. delicata ostracods can be used to reconstruct water temperature at a regional scale, which provides information on the oceanic circulation in coastal areas of the South China Sea. Sr/Ca ratios of both species do not correlate with any of the 24 water parameters recorded by the Environmental Protection Department of Hong Kong, including temperature (21.7–24.1 ∘C), salinity (23.8–33.7 PSU), dissolved oxygen (4.3–7.1 mg L−1), suspended solids (1.9–35.4 mg L−1) and pH (7.7–8.2).

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Calibration of past water temperature in the Sea of Japan based on Mg/Ca of ostracode shells of two shallow marine species in the genus Cytheropteron

Cited by 5 publications

References 45 publications

Intra‐Valve Elemental Distributions in Arctic Marine Ostracodes: Implications for Mg/Ca and Sr/Ca Paleothermometry

Intra‐Valve Elemental Distributions in Arctic Marine Ostracodes: Implications for Mg/Ca and Sr/Ca Paleothermometry

Ostracod response to monsoon and OMZ variability over the past 1.2 Myr

Calibration of Mg ∕ Ca and Sr ∕ Ca in coastal marine ostracods as a proxy for temperature

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