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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Reconstructing Last Glacial Maximum bottom water salinities from deep-sea sediment pore fluid profiles
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Reconstructing Last Glacial Maximum bottom water salinities from deep-sea sediment pore fluid profiles

机译：从深海沉积物孔隙流体剖面重建末次冰川最大底水盐度

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摘要

Deep-sea sediment pore fluids contain a record of past glaciations in their [Cl] and δ~(18)O. The signal of the Last Glacial Maximum (LGM) ice volume increase remains in the pore fluids as a local peak in each of these species. Using a one-dimensional model to account for the diffusive and advective transport within the sediment column since the LGM, the past bottom water salinity and δ~(18)O_(seawater) values can be estimated. The model is most sensitive to the shape of the forcing function used to represent bottom water variations through time, the effective diffusion coefficient, and the scatter in the data. Assuming steady-state compaction, the model is relatively insensitive to the initial condition, the bulk sedimentation rate and the assumed porosity profile, though these last two are measured independently. Overall uncertainties in the relative [Cl] increase at the LGM are between 0.1 and 0.5%, where the mean ocean change is about 3.5%.
机译：深海沉积物孔隙流体的[Cl]和δ〜（18）O记录了过去的冰期。最后冰川最大期（LGM）冰体积增加的信号保留在孔隙流体中，作为每个这些物种中的局部峰值。自LGM以来，使用一维模型来解释沉积物柱内的扩散和对流输运，可以估算过去的底部水盐度和δ〜（18）O_（海水）值。该模型对用于表示随时间变化的底部水变化的强迫函数的形状，有效扩散系数以及数据中的散射最为敏感。假设稳态压实，该模型对初始条件，整体沉降速率和假定的孔隙率轮廓相对不敏感，尽管这最后两个是独立测量的。 LGM相对[Cl]增加的总体不确定性在0.1至0.5％之间，其中平均海洋变化约为3.5％。

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