Oceanic Paleochemistry and Deep Ocean Variability

关于深海化学成分和环流变化的时间和大小的悬而未决的问题，可以通过对深海沉积物岩心中海底有孔虫Cd、13C和180的选择性配对测量来解决。将填补空白，并对最后一次冰盛期的海底古化学覆盖，将对南大西洋、南极和西北太平洋的岩芯进行检查，以澄清为什么现有的13C和Cd证据表明冰川古化学特征如此不同。将完成另外两个较长的下部岩心CD记录，以限制海底古化学变化的幅度、时间和光谱特征。这些数据将从海洋内碳和营养循环的简单模型的角度进行审查，以评估海洋化学和环流在控制大气二氧化碳方面的作用。

Unresolved issues on the timing and magnitude of changes in deep ocean chemical composition and circulation can be tackled with selective paired measurements of benthic foraminiferal Cd, &13C, and &180 in deep ocean sediment cores. Gaps will be filled and benthic paleochemical coverage of the last glacial maximum, and cores from the South Atlantic, Antarctic, and Northwest Pacific will be examined to clarify why existing &13C and Cd evidence suggest such different glacial paleochemical characteristics. Two more long downcore Cd records will be completed to constrain the amplitude, timing, and spectral characteristic of benthic paleochemical changes. This data will be examined from the perspective of simple models for carbon and nutrient cycling within the ocean, in order to assess the role of ocean chemistry and circulation in controlling atmospheric CO2.