Quantifying Changes in Thermohaline Circulation Rates During the Last 30 ka Using Radionuclides in Atlantic Sediments

本研究的目的是评估231Pa/230Th是否可以作为海洋温盐环流活力的营养无关指标。231Pa的停留时间与NADW （N. Atl）的时间尺度相似。深水区)，而230号的停留时间要短得多。因此，231 Pa从大西洋输出到CPDW；大西洋沉积物的231Pa/230Th反映了THC的输出程度，从而反映了THC的活力。该比率将用ICPMS在大西洋12个地区的沉积物中测量，以观察全新世和冰期以来THC的变化。这些数据将用于约束循环模型。

The goal of this study is to evaluate whether 231Pa/230Th can be used as a nutrient-independent measure of the vigor of thermohaline circulation in the ocean. 231Pa has a residence time similar to the time scale of NADW (N. Atl. Deep Water), whereas 230Th has a much shorter residence time. Because of this, 231 Pa is exported from the Atlantic into CPDW; the 231Pa/230Th of sediments in the Atlantic reflect the extent of export and thus the vigor of THC. The ratio will be measured in sediments from 12 areas of the Atlantic with ICPMS to look at changes in the THC from Holocene and glacial times. The data will be used to constrain circulation models.