气候变化领域集成服务门户(CCPortal): Radiocarbon ages and stable isotope measurements on sediment cores of the subarctic Pacific and its marginal seas

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.830222
	Radiocarbon ages and stable isotope measurements on sediment cores of the subarctic Pacific and its marginal seas
	Max; Lars; Lembke-Jene; Lester; Riethdorf; Jan-Rainer; Tiedemann; Ralf; Nürnberg; Dirk; Kühn; Hartmut; Mackensen; Andreas
发布日期	2014-02-28
数据集类型	dataset
英文简介	Under modern conditions only North Pacific Intermediate Water is formed in the northwest Pacific Ocean. This situation might have changed in the past. Recent studies with general circulation models indicate a switch to deep-water formation in the northwest Pacific during Heinrich Stadial 1 (17.5-15.0 ka) of the last glacial termination. Reconstructions of past ventilation changes based on paleoceanographic proxy records are still insufficient to test whether a deglacial mode of deep-water formation in the North Pacific Ocean existed. Here we present deglacial ventilation records based on radiocarbon-derived ventilation ages in combination with epibenthic stable carbon isotopes from the northwest Pacific including the Okhotsk Sea and Bering Sea, the two potential source regions for past North Pacific ventilation changes. Evidence for most rigorous ventilation of the intermediate-depth North Pacific occurred during Heinrich Stadial 1 and the Younger Dryas, simultaneous to significant reductions in Atlantic Meridional Overturning Circulation. Concurrent changes in d13C and ventilation ages point to the Okhotsk Sea as driver of millennial-scale changes in North Pacific Intermediate Water ventilation during the last deglaciation. Our records additionally indicate that changes in the d13C intermediate-water (700-1750 m water depth) signature and radiocarbon-derived ventilation ages are in antiphase to those of the deep North Pacific Ocean (>2100 m water depth) during the last glacial termination. Thus, intermediate- and deep-water masses of the northwest Pacific have a differing ventilation history during the last deglaciation.
空间范围	Median Latitude: 55.009805 * Median Longitude: 159.249148 * South-bound Latitude: 49.375667 * West-bound Longitude: 144.132533 * North-bound Latitude: 60.126700 * East-bound Longitude: -179.443500
时间范围	2002-07-08T00:05:00 - 2009-09-22T00:06:00
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/233551
推荐引用方式 GB/T 7714	Max,Lars,Lembke-Jene,et al. Radiocarbon ages and stable isotope measurements on sediment cores of the subarctic Pacific and its marginal seas.2014-02-28.https://doi.org/10.1594/PANGAEA.830222.