edu.ucar.opensky::articles:22593 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T15:34:52.861349 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7qn69wv https://doi.org/10.5065/D6RX99HX https Related Service #1 Cheyenne: SGI ICE XA Cluster Assessing the ability of zonal δ18O contrast in benthic foraminifera to reconstruct deglacial evolution of Atlantic Meriodonal Overturning Circulation 2019-05-01T00:00:00Z publication https://n2t.org/ark:/85065/d7qn69wv https://doi.org/10.1029/2019PA003564 Gu, S. author Liu, Z. author Lynch-Stieglitz, J. author Jahn, A. author Zhang, J. author Lindsay, Keith author Wu, L. author UCAR/NCAR - Library publisher delta O-18 in foraminifera (delta O-18(c)) is a useful proxy for density, and the strength of the Atlantic Meridional Overturning Circulation (AMOC) can be reconstructed by the zonal density contrast in the Atlantic. However, whether the deglacial zonal delta O-18(c) contrast can represent the AMOC change is still unclear. delta O-18(c) contrast across the Florida Straits has been hypothesized as a proxy for the AMOC evolution during the last deglaciation, but the strength of Florida Current could also be influenced by wind forcing. Here we examine the ability of the zonal delta O-18(c) contrast to reconstruct AMOC in a deglacial model simulation. The model simulation suggests that the deglacial variation of the Florida Current strength is dominated by AMOC, with the wind effect on the variation of the Florida Current being negligible. Furthermore, the delta O-18(c) contrast across the western boundary along the entire Atlantic and the basin-wide delta O-18(c) contrast in the North Atlantic in the upper ocean can also be used to reconstruct AMOC. However, using basin-wide delta O-18(c) contrast to reconstruct AMOC in the South Atlantic is not possible at all water depths. In the subtropical South Atlantic, the basin-wide delta O-18(c) contrast is decoupled from the density contrast between 400 to 600 m through the deglaciation because of the deglacial change of the Antarctic Intermediate Water. Therefore, delta O-18(c) is a useful proxy to reconstruct past density and in turn past AMOC, but caution has to be used when using the basin-wide delta O-18(c) contrast to reconstruct the basin-wide density contrast in the South Atlantic. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2019 American Geophysical Union. None eng geoscientificInformation