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首页> 外文期刊>Paleoceanography >Mg/Ca ratios of single planktonic foraminifer shells and the potential to reconstruct the thermal seasonality of the water column
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Mg/Ca ratios of single planktonic foraminifer shells and the potential to reconstruct the thermal seasonality of the water column

机译：单浮游有孔虫壳的Mg / Ca比和重建水柱热季节的潜力

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摘要

Mg/Ca ratios of surface and subsurface dwelling foraminifera provide valuable information about the past temperature of the water column. Planktonic foraminifera calcify over a period of weeks to months. Therefore, the range of Mg/Ca temperatures obtained from single specimens potentially records seasonal temperature changes. We present solution-derived Mg/Ca ratios for single specimens of the planktonic foraminifera species Globigerinoides ruber (pink), Globigerinoides ruber (white), and Globorotalia inflata from a sediment trap off northwest Africa (2045.6N, 1841.9W). Cleaning of single specimens was achieved using a flow-through system in order to prevent sample loss. Mg/Ca ratios of surface dwelling G. ruber (pink) show strong seasonality linked to sea surface temperature. Mg/Ca ratios of G. ruber (white) do not show such seasonality. Subsurface dwelling G. inflata flux is largest during the main upwelling season, but Mg/Ca ratios reflect annual temperatures at intermediate water depths. The sediment trap time series suggests that changes in the range of Mg/Ca ratios exhibited by single specimens of G. ruber (pink) and G. inflata from the sedimentary record should provide information on the past temperature range under which these species calcified. Statistical analysis suggests detectable changes in the Mg/Ca range are 0.80 mmol/mol (G. ruber (pink)) and 0.34 mmol/mol (G. inflata). For G. ruber (pink), such changes would indicate changes in the seasonal sea surface temperature range >4C or a shift in the main calcification and reproductive period. For G. inflata, such changes would indicate >1.7C changes in the thermocline temperature or a change in the depth habitat.
机译：地下和地下栖孔虫的Mg / Ca比值提供了有关水柱过去温度的有价值的信息。浮游有孔虫钙化持续数周至数月。因此，从单个样品获得的Mg / Ca温度范围可能会记录季节性温度变化。我们为西北非洲（2045.6N，1841.9W）的沉积物陷阱中的浮游有孔虫物种Globigerinoides ruber（粉红色），Globerinoides ruber（白色）和Globorotalia inflata的单个标本提供了溶液衍生的Mg / Ca比值。为了防止样品流失，使用流通系统对单个样品进行了清洁。表层生丁香橡胶（粉红色）的Mg / Ca比值显示出与海表温度有关的强烈季节性。丁香橡胶（白色）的Mg / Ca比值没有显示出这种季节性。在主要的上升期，地下居民的G. inflata通量最大，但Mg / Ca比值反映了中等水深处的年温度。沉积物捕集时间序列表明，由沉积记录中的单个G. ruber（粉红色）和in。gflat样品显示的Mg / Ca比值范围的变化应提供有关这些物种钙化的过去温度范围的信息。统计分析表明，Mg / Ca范围内可检测到的变化为0.80 mmol / mol（丁香（粉红色））和0.34 mmol / mol（黄麻）。对于丁香（粉红色），这种变化将表明季节性海表温度范围> 4C或主要钙化和生殖期发生变化。对于膨胀的G.inflata，这种变化将表明温跃层温度的变化> 1.7C或深度栖息地的变化。

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