North Atlantic intermediate water variability over the past 20,000 years

Journal article

Publication Details

Author(s): Yasuhara M, deMenocal PB, Dwyer GS, Cronin TM, Okahashi H, Huang HH
Journal: Geology
Publication year: 2019
Volume: 47
Journal issue: 7
Pages range: 659-663
ISSN: 0091-7613
eISSN: 1943-2682


North Atlantic intermediate-water temperature variations based on ostracod Mg/Ca ratios from Ocean Drilling Program (ODP) Hole 1055B document a series of multi-centennial-scale abrupt warming events throughout the last deglaciation and Holocene (up to ~3 °C). These events are coherent with abrupt climate reversals including Heinrich event 1, the Younger Dryas-Intra-Allerød cold period, and Holocene North Atlantic Deep Water (NADW) reduction periods. Deglacial-Holocene warm events were likely related to reduction in the strength of the upper NADW (Labrador Sea Water). We also found a long-term cooling trend in the ODP 1055 Mg/Ca record indicating continuous Labrador Sea Water strengthening throughout the Holocene. Our results help to better understand deglacial-Holocene upper NADW dynamics that remain poorly understood but can be important for regional and global climates.

FAU Authors / FAU Editors

Huang, Huai-Hsuan
Lehrstuhl für Paläoumwelt

External institutions with authors

Duke University
Lamont-Doherty Earth Observatory
United States Geological Survey (USGS)
University of Hong Kong (HKU) / 香港大學

How to cite

Yasuhara, M., deMenocal, P.B., Dwyer, G.S., Cronin, T.M., Okahashi, H., & Huang, H.-H. (2019). North Atlantic intermediate water variability over the past 20,000 years. Geology, 47(7), 659-663.

Yasuhara, Moriaki, et al. "North Atlantic intermediate water variability over the past 20,000 years." Geology 47.7 (2019): 659-663.


Last updated on 2019-11-07 at 09:08