气候变化领域集成服务门户(CCPortal): Stable carbon and oxygen isotope record of foraminifera of IODP Site 303-1307

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.841136
	Stable carbon and oxygen isotope record of foraminifera of IODP Site 303-1307
	Sarnthein; Michael; Bartoli; Gretta; Prange; Matthias; Schmittner; Andreas; Schneider; Birgit; Weinelt; Mara; Andersen; Nils; Garbe-Schönberg; Carl-Dieter
发布日期	2009-01-05
数据集类型	dataset
英文简介	A major tipping point of Earth's history occurred during the mid-Pliocene: the onset of major Northern-Hemisphere Glaciation (NHG) and of pronounced, Quaternary-style cycles of glacial-to-interglacial climates, that contrast with more uniform climates over most of the preceding Cenozoic and continue until today (Zachos et al., 2001, doi:10.1126/science.1059412). The severe deterioration of climate occurred in three steps between 3.2 Ma (warm MIS K3) and 2.7 Ma (glacial MIS G6/4) (Lisiecki and Raymo, 2005, doi:10.1029/2004PA001071). Various models (sensu Driscoll and Haug, 1998, doi:10.1126/science.282.5388.436) and paleoceanographic records (intercalibrated using orbital age control) suggest clear linkages between the onset of NHG and the three steps in the final closure of the Central American Seaways (CAS), deduced from rising salinity differences between Caribbean and the East Pacific. Each closing event led to an enhanced North Atlantic meridional overturning circulation and this strengthened the poleward transport of salt and heat (warmings of +2-3°C) (Bartoli et al., 2005, doi:10.1016/j.epsl.2005.06.020). Also, the closing resulted in a slight rise in the poleward atmospheric moisture transport to northwestern Eurasia (Lunt et al., 2007, doi:10.1007/s00382-007-0265-6), which probably led to an enhanced precipitation and fluvial run-off, lower sea surface salinity (SSS), and an increased sea-ice cover in the Arctic Ocean, hence promoting albedo and the build-up of continental ice sheets. Most important, new evidence shows that the closing of the CAS led to greater steric height of the North Pacific and thus doubled the low-saline Arctic Throughflow from the Bering Strait to the East Greenland Current (EGC). Accordingly, Labrador Sea IODP Site 1307 displays an abrupt but irreversible EGC cooling of 6°C and freshening by ~2 psu from 3.25/3.16-3.00 Ma, right after the first but still reversible attempt of closing the CAS.
空间范围	Median Latitude: 58.505875 * Median Longitude: -46.400725 * South-bound Latitude: 58.505783 * West-bound Longitude: -46.400900 * North-bound Latitude: 58.505967 * East-bound Longitude: -46.400550
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/219982
推荐引用方式 GB/T 7714	Sarnthein,Michael,Bartoli,et al. Stable carbon and oxygen isotope record of foraminifera of IODP Site 303-1307.2009-01-05.https://doi.org/10.1594/PANGAEA.841136.