Sea surface temperature(SST) proxies including B/Ca, Mg/Ca, Sr/Ca, U/Ca and δ18O were analyzed in the skeleton of a Porites coral collected from the Zhujiang River(Pearl River) Estuary(ZRE). These geochemical proxies...Sea surface temperature(SST) proxies including B/Ca, Mg/Ca, Sr/Ca, U/Ca and δ18O were analyzed in the skeleton of a Porites coral collected from the Zhujiang River(Pearl River) Estuary(ZRE). These geochemical proxies are influenced by river runoff and this area of the northern South China Sea is strongly affected by seasonal freshwater floods. We assessed the robustness of each SST proxy through comparison with the local instrumental SST. Coral Sr/Ca shows the highest correlation with SST variations(r2=0.59), suggesting Sr/Ca is the most robust SST proxy. In contrast, coral δ18O(r2=0.46), B/Ca(r2=0.43) and U/Ca(r2=0.41) ratios were only moderately correlated with SST variations, suggesting that they are disturbed by some other factors in addition to SST. The poor correlation(r2=0.27) between SST and Mg/Ca indicates that Mg/Ca in coral skeletons is not a simple function of SST variations. This may ultimately limit the use of Mg/Ca as a coral paleothermometer.展开更多
由软锰矿的酸的猩鸿的 GR 的去色在这篇论文被学习。软锰矿,反应温度,和颤动速度去色效率的氢指数答案,剂量和颗粒度的 Theeffects 被讨论。根据实验结果,去色效率可以由软锰矿为 40 mg/L GR 答案超过 95% 。氢指数在影响酸的猩鸿的...由软锰矿的酸的猩鸿的 GR 的去色在这篇论文被学习。软锰矿,反应温度,和颤动速度去色效率的氢指数答案,剂量和颗粒度的 Theeffects 被讨论。根据实验结果,去色效率可以由软锰矿为 40 mg/L GR 答案超过 95% 。氢指数在影响酸的猩鸿的 GR 的去色的所有因素之中是很重要的。软锰矿,反应温度,和颤动速度的剂量和颗粒度在去色上有小 benitfit。Thehigh 去色效率和在软锰矿和酸的猩鸿的 GR 之间的产品的货到付款以及英尺红外系列的低移动效率显示酸的猩鸿的 GR 在矿物质的接口上经历氧化还原反应,它的色基是 oxidated 和 decolored,但是它没被氧化彻底地移开。展开更多
基金The National Basic Research Program(973 program) of China under contract No.2013CB956104the National Natural Science Foundation of China under contract Nos 41106054,41306109 and 41476038
文摘Sea surface temperature(SST) proxies including B/Ca, Mg/Ca, Sr/Ca, U/Ca and δ18O were analyzed in the skeleton of a Porites coral collected from the Zhujiang River(Pearl River) Estuary(ZRE). These geochemical proxies are influenced by river runoff and this area of the northern South China Sea is strongly affected by seasonal freshwater floods. We assessed the robustness of each SST proxy through comparison with the local instrumental SST. Coral Sr/Ca shows the highest correlation with SST variations(r2=0.59), suggesting Sr/Ca is the most robust SST proxy. In contrast, coral δ18O(r2=0.46), B/Ca(r2=0.43) and U/Ca(r2=0.41) ratios were only moderately correlated with SST variations, suggesting that they are disturbed by some other factors in addition to SST. The poor correlation(r2=0.27) between SST and Mg/Ca indicates that Mg/Ca in coral skeletons is not a simple function of SST variations. This may ultimately limit the use of Mg/Ca as a coral paleothermometer.
基金the National Natural Science Foundation of China (40472026).
文摘由软锰矿的酸的猩鸿的 GR 的去色在这篇论文被学习。软锰矿,反应温度,和颤动速度去色效率的氢指数答案,剂量和颗粒度的 Theeffects 被讨论。根据实验结果,去色效率可以由软锰矿为 40 mg/L GR 答案超过 95% 。氢指数在影响酸的猩鸿的 GR 的去色的所有因素之中是很重要的。软锰矿,反应温度,和颤动速度的剂量和颗粒度在去色上有小 benitfit。Thehigh 去色效率和在软锰矿和酸的猩鸿的 GR 之间的产品的货到付款以及英尺红外系列的低移动效率显示酸的猩鸿的 GR 在矿物质的接口上经历氧化还原反应,它的色基是 oxidated 和 decolored,但是它没被氧化彻底地移开。