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

TitleCalibration of Mg ∕ Ca and Sr ∕ Ca in coastal marine ostracods as a proxy for temperature
Authors
Issue Date2021
PublisherCopernicus GmbH. The Journal's web site is located at http://www.copernicus.org/site/EGU/bg/
Citation
Biogeosciences, 2021, v. 18, p. 1987-2001 How to Cite?
AbstractThe 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).
Persistent Identifierhttp://hdl.handle.net/10722/304958
ISSN
2023 Impact Factor: 3.9
2023 SCImago Journal Rankings: 1.767
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorRODRIGUEZ MORENO, M-
dc.contributor.authorNot, C-
dc.date.accessioned2021-10-05T02:37:41Z-
dc.date.available2021-10-05T02:37:41Z-
dc.date.issued2021-
dc.identifier.citationBiogeosciences, 2021, v. 18, p. 1987-2001-
dc.identifier.issn1726-4170-
dc.identifier.urihttp://hdl.handle.net/10722/304958-
dc.description.abstractThe 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).-
dc.languageeng-
dc.publisherCopernicus GmbH. The Journal's web site is located at http://www.copernicus.org/site/EGU/bg/-
dc.relation.ispartofBiogeosciences-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.titleCalibration of Mg ∕ Ca and Sr ∕ Ca in coastal marine ostracods as a proxy for temperature-
dc.typeArticle-
dc.identifier.emailNot, C: cnot@hku.hk-
dc.identifier.authorityNot, C=rp02029-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.5194/bg-18-1987-2021-
dc.identifier.scopuseid_2-s2.0-85103162504-
dc.identifier.hkuros326214-
dc.identifier.volume18-
dc.identifier.spage1987-
dc.identifier.epage2001-
dc.identifier.isiWOS:000631340900004-
dc.publisher.placeGermany-

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