scholarly journals The Atlantic Ocean at the Last Glacial Maximum: 2. Reconstructing the Current Systems with a Global Ocean Model

2003 ◽  
pp. 549-583 ◽  
Author(s):  
A. Paul ◽  
C. Schäfer-Neth
Keyword(s):  
Atlantic Ocean ◽  
Last Glacial Maximum ◽  
Ocean Model ◽  
Glacial Maximum ◽  
Global Ocean ◽  
Last Glacial ◽  
Current Systems ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Flux and provenance of ice-rafted debris in the earliest Pleistocene sub-polar North Atlantic Ocean comparable to the last glacial maximum

2012 ◽  
Vol 341-344 ◽  
pp. 222-233 ◽  
Author(s):  
Ian Bailey ◽  
Gavin L. Foster ◽  
Paul A. Wilson ◽  
Luigi Jovane ◽  
Craig D. Storey ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Last Glacial Maximum ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Glacial Maximum ◽  
Last Glacial ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Atlantic Ocean modulated hydroclimate of the subtropical northeastern Mexico since the last glacial maximum and comparison with the southern US

2016 ◽  
Vol 434 ◽  
pp. 141-150 ◽  
Author(s):  
Priyadarsi D. Roy ◽  
Axel Rivero-Navarrete ◽  
José L. Sánchez-Zavala ◽  
Laura E. Beramendi-Orosco ◽  
Gowrappan Muthu-Sankar ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Last Glacial Maximum ◽  
Glacial Maximum ◽  
Last Glacial ◽  
Southern Us ◽  
Northeastern Mexico ◽  
The Last Glacial Maximum ◽  
The Last Glacial

scholarly journals 230Th normalization: New insights on an essential tool for quantifying sedimentary fluxes in the modern and Quaternary ocean

2020 ◽  
Author(s):  
Kassandra Costa ◽  
Keyword(s):  
Last Glacial Maximum ◽  
Global Scale ◽  
Glacial Maximum ◽  
Global Ocean ◽  
Last Glacial ◽  
High Particle ◽  
Mass Fluxes ◽  
The Last Glacial Maximum ◽  
Boundary Scavenging ◽  
The Last Glacial

<p><sup>230</sup>Th-normalization is a valuable paleoceanographic tool for reconstructing high-resolution sediment fluxes during the late Pleistocene (last ~500,000 years). As its application has expanded to ever more complex marine environments, the nuances of <sup>230</sup>Th systematics, with regards to particle type, particle size, lateral advective/diffusive redistribution, and other processes, have emerged. We synthesized over 1000 sedimentary records of <sup>230</sup>Th from across the global ocean at two time slices, the Late Holocene (0-5000 years ago, or 0-5 ka) and the Last Glacial Maximum (18.5-23.5 ka), and investigated the spatial structure of <sup>230</sup>Th-normalized mass fluxes. On a global scale, sedimentary mass fluxes were significantly higher during the Last Glacial Maximum (1.79-2.17 g/cm<sup>2</sup>kyr, 95% confidence) relative to the Holocene (1.48-1.68 g/cm<sup>2</sup>kyr, 95% confidence). We then examined the potential confounding influences of boundary scavenging, nepheloid layers, hydrothermal scavenging, size dependent sediment fractionation, and carbonate dissolution on the efficacy of <sup>230</sup>Th as a constant flux proxy. Anomalous <sup>230</sup>Th behavior is sometimes observed proximal to hydrothermal ridges and in continental margins where high particle fluxes and steep continental slopes can lead to the combined effects of boundary scavenging and nepheloid interference. Notwithstanding these limitations, we found that <sup>230</sup>Th-normalization is a robust tool for determining sediment mass accumulation rates in the majority of pelagic (> 1000 m) marine settings.</p>

scholarly journals The impacts of Meltwater Pulse-1A in the South Atlantic Ocean deep circulation since the Last Glacial Maximum

2013 ◽  
Vol 9 (6) ◽  
pp. 6375-6395 ◽  
Author(s):  
J. M. Marson ◽  
I. Wainer ◽  
Z. Liu ◽  
M. M. Mata
Keyword(s):  
Atlantic Ocean ◽  
Sea Level ◽  
Last Glacial Maximum ◽  
South Atlantic ◽  
Glacial Maximum ◽  
South Atlantic Ocean ◽  
The South ◽  
Last Glacial ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Abstract. Since 21 000 yr ago, the oceans have received large amounts of freshwater in pulses coming from the melting ice sheets. A specific event, known as meltwater pulse 1A (MWP-1A), has been identified in sea-level and temperature proxy records as responsible for the increase of ~20 m in sea level in less than 500 yr. Although its origin and timing are still under discussion, MWP-1A seems to have had a significant impact on several components of the climatic system. The present work aims to elucidate these impacts on the water mass distribution of the South Atlantic Ocean through the analysis of a transient simulation of the climate evolution from the Last Glacial Maximum to Present Day using a state-of-art CGCM, the National Center for Atmospheric Research Community Climate System Model version 3 (NCAR CCSM3). Results show that the freshwater discharge associated with the timing of MWP-1A was crucial to establish the present thermohaline structure associated with the North Atlantic Deep Water, marking the transition between a shallower and a deeper Atlantic Meridional Overturning Circulation.

scholarly journals Dynamical Reconstruction of Upper-Ocean Conditions in the Last Glacial Maximum Atlantic

2014 ◽  
Vol 27 (2) ◽  
pp. 807-823 ◽  
Author(s):  
Holly Dail ◽  
Carl Wunsch
Keyword(s):  
Atlantic Ocean ◽  
Last Glacial Maximum ◽  
General Circulation ◽  
Glacial Maximum ◽  
Upper Ocean ◽  
Last Glacial ◽  
Least Squares Fit ◽  
Westerly Winds ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Abstract Proxies indicate that the Last Glacial Maximum (LGM) Atlantic Ocean was marked by increased meridional and zonal near sea surface temperature gradients relative to today. Using a least squares fit of a full general circulation and sea ice model to upper-ocean proxy data with specified error estimates, a seasonally varying reconstruction is sought of the Atlantic Ocean state that is consistent with both the known dynamics and the data. With reasonable uncertainty assumptions for the observations and the adjustable (control) variables, a consistent LGM ocean state is found, one not radically different from the modern one. Inferred changes include a strengthening of the easterly and westerly winds, leading to strengthened subtropical and subpolar gyres, and increased upwelling favorable winds off the coast of Africa, leading to particularly cold SSTs in those regions.

Sign in / Sign up

Export Citation Format

Share Document