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

代用记录对于重建古海洋学/古气候条件，从而了解海洋学和气候变化是非常有用的，尽管这些数据必须经过很好的校准。 然而，尚未充分开发替代工具，以评估太平洋海水中溶解无机碳和氧的稳定同位素组成在过去几个世纪中的年度至百年时间尺度变化，或评估这些变量和不同深度的海水温度。 西太平洋在热带和全球气候中发挥着重要作用，因此是进行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sclerosponge，Acanthocheates wellsi，骨骼d13 C，d18 O和锶/钙（Sr/Ca），以评估校准的代理记录的年度至年代际的时间尺度。校准，然后将被应用到两个高分辨率的50年稳定同位素和Sr/Ca记录和年际到年代际的时间尺度的变化，在较长的记录将进行评估，通过比较它们可用的仪器，卫星和模型输出数据。结果将是一个有价值的工具，约束现有的碳吸收模型，初始化和测试ENSO模型，并普遍增加我们的知识的自然时空变化d13 CDIC，d18 Osw，海水温度在表面和整个深度在热带地区。

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.