Pore Fluid as Paleoceanographic Proxy: Reconstructing the Temperature and 0 18 O of the Glacial Ocean

9617860 PISchrag以前的工作表明，沉积物孔隙水中氧同位素比率的垂直剖面反映了海底水过去的变化，可以用来区分水组成和温度对海洋碳酸盐同位素特征的影响。初步结果表明，上一次冰川时期的底层水域和热带海面温度明显低于现在。该项目将分析来自全球阵列地点的沉积物孔隙水中的氧和氢同位素以及氯，以确认初步发现并测试区域差异。孔隙水扩散模型将得到进一步发展，并将初步尝试将结果应用于海洋环流模型。

9617860 Schrag Previous work by the PI has shown that vertical profiles of the oxygen isotope ratio in sediment porewaters reflect past changes in ocean bottom water and can be used to separated the effects of water composition and temperature upon isotopic signatures in marine carbonates. Preliminary results suggest that bottom waters and tropical sea surface temperatures during the last glacial period were significantly colder than at present. The project will analyze oxygen and hydrogen isotopes and C1 in sediment porewaters from a global array sites to confirm the preliminary findings and test for regional differences. Porewater diffusion models will be developed further, and some initial attempts will be made at applying the results to ocean circulation models.