NOAA/WDS Paleoclimatology - Keigwin and Schlegel 2002 North Atlantic Postglacial Deep Water Ventilation Sediment Data

Stable isotope, sedimentological, and radiocarbon data from cores at ∼3 km water depth on the Blake Ridge, western subtropical North Atlantic, reveal the history of deep water ventilation since the last glacial maximum (LGM). Bulk sediment accumulation rates varied locally by a factor of 2 under the influence of bottom currents in this sediment drift environment, but the sand flux, mostly foraminifera, was nearly identical at a given time. This suggests that the rain rate of foraminifera (mostly planktonic) was constant, that transport of foraminifera was negligible, and that current-controlled differences in clay and silt transport drive bulk accumulation. In two of the cores, flux peaks in the benthic foraminifera Cibicidoides and Uvigerina peregrina occurred during the Younger Dryas (YD) cold event, and at 18.2, 19.6, 21.1, 25.0, and 28.1 ka. Radiocarbon measurements on those benthic foraminifera show the ventilation age of bottom waters was ∼1000 years during the YD, and for older events it was as great as 2000 years. These results contrast with Holocene ventilation, which was ∼500 years and 700 years at 1500 years and ∼7100 years before present, respectively.

本归档古气候学（Paleoclimatology）研究数据集可从美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）国家环境信息中心（National Centers for Environmental Information, NCEI）获取，隶属于古气候学世界数据服务（World Data Service for Paleoclimatology, WDS）。该数据集对应的NCEI研究类别为古海洋学（Paleoceanography）。数据集涵盖北大西洋（North Atlantic Ocean）地理区域内的古海洋学相关参数，时间覆盖区间为距今19941年至1197年（BP）。如需了解参数与研究地点的详细信息，请查阅元数据。使用本数据集时，请引用该研究。