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

使用大西洋沉积物中的放射性核素量化过去 30 ka 期间温盐环流率的变化

• 批准号: 0099176
• 负责人: Roger Francois
• 金额: $ 40.65万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-04-15 至 2004-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0099176&HistoricalAwards=false
• 关键词: Quantifying; Changes; Thermohaline; Circulation; Rates

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.

本研究的目的是评估231 Pa/230 Th是否可以作为一个营养独立的措施，在海洋中的温盐环流的活力。231 Pa的停留时间与NADW（N.阿特尔深水），而230 Th具有短得多的停留时间。因此，231 Pa从大西洋输出到CPDW;大西洋沉积物的231 Pa/230 Th反映了输出的程度，从而反映了THC的活力。该比率将在大西洋12个地区的沉积物中进行测量，以观察全新世和冰期THC的变化。这些数据将用于约束循环模型。