Global gridded data set of the oxygen isotopic composition in seawater
Global gridded data set of the oxygen isotopic composition in seawater
复制标题
DOI：
10.1029/2006gl026011
复制
发表时间：
2006-06-21
影响因子：
5.2
通讯作者：
Schmidt, Gavin A.
中科院分区：
文献类型：
--
作者：
LeGrande, Allegra N.;Schmidt, Gavin A.
我们提出了一个新的 3 维 1 度 x 1 度网格数据集，用于年平均海水氧同位素比 (delta O-18)，用于海洋学和古海洋学应用。它是根据过去 50 年进行的大量观测，结合区域三角洲 O-18 到稀疏数据区域的盐度关系的估计而构建的。我们使用海滨和水团示踪剂浓度来帮助定义不同的水团，在这些水团上一致的局部关系是有效的。生成的数据集与 GEOSECS 数据（如果可用）进行了很好的比较；然而，在某些地区，特别是存在海冰的地区，明显的季节性可能会使结果产生偏差。作为该数据集的一个应用示例，我们使用所得的地表 Delta O-18 作为启用同位素的 GISS ModelE 的边界条件，以与降水数据的同位素组成进行更真实的比较，从而量化 Delta O-18 对降水同位素组成的“源效应”。
We present a new 3-dimensional 1 degrees x 1 degrees gridded data set for the annual mean seawater oxygen isotope ratio (delta O-18) to use in oceanographic and paleoceanographic applications. It is constructed from a large set of observations made over the last 50 years combined with estimates from regional delta O-18 to salinity relationships in areas of sparse data. We use ocean fronts and water mass tracer concentrations to help define distinct water masses over which consistent local relationships are valid. The resulting data set compares well to the GEOSECS data (where available); however, in certain regions, particularly where sea ice is present, significant seasonality may bias the results. As an example application of this data set, we use the resulting surface delta O-18 as a boundary condition for isotope-enabled GISS ModelE to yield a more realistic comparison to the isotopic composition of precipitation data, thus quantifying the 'source effect' of delta O-18 on the isotopic composition of precipitation.