Stable Isotopes and Strontium in Western Pacific Sclerosponges: Calibration and Applications to Paleoceanography

Proxy记录对于重建古海洋/古气候条件，从而了解海洋和气候变化是非常有用的，尽管这些数据必须得到很好的校准。但是，用于评估过去几个世纪太平洋海水中溶解的无机碳和氧的稳定同位素组成的年度至百年时间尺度变异性或评估这些变量和整个深度的海水温度的替代工具尚未得到充分开发。西太平洋在热带和全球气候中发挥着重要作用，因此是开展这项研究的理想地点。宾夕法尼亚大学的一位科学家将定量校准硬壳菌、棘皮藻、骨骼d13C、d18O和锶/钙(锶/钙)，以评估校准的年度到年代际时间尺度上的替代记录。然后，将对两条高分辨率的50年稳定同位素和锶/钙记录进行校准，并通过将其与现有的仪器、卫星和模型输出数据进行比较，评估较长记录的年际至年代际时间尺度变化。这些结果将成为约束现有碳吸收模式、初始化和检验ENSO模式的有价值的工具，并在总体上增加我们对热带表层和跨深度海水温度d13CDIC、d18Osw和海水温度的自然时空变化的了解。

ABSTRACTOCE-0426022Proxy records are extremely useful for reconstructing paleoceanographic/ paleoclimate conditions and hence understanding oceanographic and climate change, although these data must be well-calibrated. However, proxy tools to evaluate annual-to-centennial timescale variability of the stable isotopic composition of dissolved inorganic carbon and oxygen in seawater over the past several centuries in the Pacific or to evaluate these variables and seawater temperature across depth have not been fully developed. The western Pacific plays a large role in tropical and global climate and is therefore an ideal location to pursue this research. A scientist at the University of Pennsylvania will quantitatively calibrate the sclerosponge, Acanthocheatetes wellsi, skeletal d13C, d18O, and strontium/calcium (Sr/Ca) to evaluate calibrated proxy records on annual-to-interdecadal timescales. The calibrations will then be applied to two high-resolution 50-year stable isotope and Sr/Ca records and the interannual-to-interdecadal timescale variability in the longer records will be evaluated by comparing them to available instrumental, satellite, and model output data. The results will be a valuable tool for constraining existing carbon uptake models, initializing and testing ENSO models, and generally increasing our knowledge of the natural spatial and temporal variability in d13CDIC, d18Osw, and seawater temperature at the surface and across depth in the tropics.