SGER: Verification of the Use of Sclerosponges for Paleoclimatic Research

该项目将评估在单个骨骼内和从同一地点采集的标本中，硬骨壤中锶/钙比值和氧同位素的地球化学记录的重现性。这项研究被认为是探索性的，因为尽管目前还没有关于在硬壳脊椎动物骨架中测量的地球化学信号可能产生误差的信息，但这些替代指标可能非常重要，因为它们可以提供过去500-700年来水团特征的高分辨率信息。从该SGER获得的信息将使PI能够限制从组合的地球化学数据计算盐度时产生的传播误差。这些数据对于确定从硬脊液中重建北大西洋盐度是真实的还是低于分析不确定性是至关重要的。一旦确定了这些错误，就有可能确定大西洋的盐度变化是否可以从过去500年或更长时间的生物档案中重建出来。该项目的更广泛影响包括支持一名博士生的研究，并首次对小冰期和中世纪暖期等时期的大西洋环流盐度和温度进行超高分辨率测量。

SGER: Verification of the Use of Sclerosponges for Paleoclimatic ResearchPeter SwartUniversity of Miami/RSMASAbstractThis project will assess the reproducibility of geochemical records of Sr/Ca ratios and oxygen isotopes in sclerosponges, both within single skeletons and from specimens collected from the same location. This research is considered exploratory because although there is no information at present as to the error that can be placed on the geochemical signals measured in the skeleton of sclerosponges, these proxies are potentially very important as they can provide high-resolution information of water mass characteristics over the past 500-700 years. The information obtained from this SGER will enable the PI to constrain the propagated error produced when computing salinities from combined geochemical data. These data are critical for determining whether reconstructions of North Atlantic salinities from sclerosponges are real or below analytical uncertainty. Once these errors have been established, it will then be possible to determine whether or not salinity variations in the Atlantic can be reconstructed from this biological archive over the past 500 years and longer. The broader impacts of this project include support of a PhD student's research and the first ultra high-resolution measurement of Atlantic gyre salinity and temperature during periods such as the Little Ice Age and the Medieval Warm Period.