Item talk:Q313249

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   "@type": "Article",
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   "name": "Mg/Ca ratios in ostracode genera Sarsicytheridea and Paracyprideis: A potential paleotemperature proxy for Arctic and subarctic continental shelf and slope waters",
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     "name": "Marine Micropaleontology",
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   "abstract": "We evaluate the potential utility of Mg/Ca ratios in the sublittoral ostracode genera Sarsicytheridea and Paracyprideis as a paleotemperature proxy for continental shelf and upper slope waters of the Arctic Ocean and adjacent seas. Using sediment core-top and surface sediment samples, the shells of three species, S. bradii, S. punctillata, and P. pseudopunctillata, were analyzed from Arctic Ocean sites ranging in water depth from 7 to 200 meters and bottom-water temperatures (BWT) of -1.5 \u00b0C to 12 \u00b0C. Generally, Mg/Ca ratios range from 4 to 9 mmol/mol. The results show excellent agreement with the range of Mg/Ca ratios obtained in a previous study by Ingram (1998) of core-top shells of Sarsicytheridea from the sub-polar North Atlantic Ocean and adjacent seas, with BWT ranging from 1 to 11.4 \u00b0C. However, unlike this previous study of Sarsicytheridea, and previous work on the Arctic ostracode marine genus Krithe showing strong correlations between Mg/Ca and BWT, Mg/Ca ratios in Arctic specimens analyzed here are not correlated with BWT below 0\u00b0C. We hypothesize that this has to do with uncertainty regarding the actual ambient BWT at the time of shell secretion.  As with many continental shelf sites, the individual sites used in the study have large interannual and seasonal variations in BWT, in some cases >5-8 \u00b0C. Thus, there is considerable difficulty in assigning a proper shell secretion temperature and, in turn, fully assessing the utility of Sarsicytheridea Mg/Ca ratios as a paleotemperature proxy below 0 \u00b0C. There are a number of possible solutions, such as laboratory culturing of these genera under controlled conditions, adding additional sites with a range of maximal and minimal bottom water temperatures, and pairing other geochemical or isotopic measures of temperature, among others. Regardless, the good overall calibration of Mg/Ca results from samples with temperatures above 0 \u00b0C is encouraging and justifies continued evaluation of this potential paleothermometer for Arctic continental shelf and upper slope environments.",
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