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

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