Warmings in the far northwestern Pacific promoted pre-Clovis immigration to America during Heinrich event 1

Geology ◽  
2006 ◽  
Vol 34 (3) ◽  
pp. 141 ◽  
Author(s):  
Michael Sarnthein ◽  
Thorsten Kiefer ◽  
Pieter M. Grootes ◽  
Henry Elderfield ◽  
Helmut Erlenkeuser
Keyword(s):  
Northwestern Pacific ◽  
Heinrich Event ◽  
Heinrich Event 1

scholarly journals The Last Glacial Maximum and Heinrich Event 1 in terms of climate and vegetation around the Alboran Sea: a preliminary model-data comparison

2005 ◽  
Vol 337 (10-11) ◽  
pp. 983-992 ◽  
Author(s):  
Masa Kageyama ◽  
Nathalie Combourieu Nebout ◽  
Pierre Sepulchre ◽  
Odile Peyron ◽  
Gerhard Krinner ◽  
...  
Keyword(s):  
Last Glacial Maximum ◽  
Glacial Maximum ◽  
Model Data ◽  
Last Glacial ◽  
Data Comparison ◽  
Heinrich Event ◽  
Preliminary Model ◽  
The Last Glacial Maximum ◽  
Heinrich Event 1 ◽  
The Last Glacial

scholarly journals Tropical climate and vegetation changes during Heinrich Event 1: a model-data comparison

2012 ◽  
Vol 8 (1) ◽  
pp. 37-57 ◽  
Author(s):  
D. Handiani ◽  
A. Paul ◽  
L. Dupont
Keyword(s):  
South America ◽  
Vegetation Changes ◽  
Model Data ◽  
Tropical Regions ◽  
Data Comparison ◽  
Heinrich Event ◽  
Climate Background ◽  
Northern South America ◽  
Glacial Climate ◽  
Heinrich Event 1

Abstract. Abrupt climate changes from 18 to 15 thousand years before present (kyr BP) associated with Heinrich Event 1 (HE1) had a strong impact on vegetation patterns not only at high latitudes of the Northern Hemisphere, but also in the tropical regions around the Atlantic Ocean. To gain a better understanding of the linkage between high and low latitudes, we used the University of Victoria (UVic) Earth System-Climate Model (ESCM) with dynamical vegetation and land surface components to simulate four scenarios of climate-vegetation interaction: the pre-industrial era, the Last Glacial Maximum (LGM), and a Heinrich-like event with two different climate backgrounds (interglacial and glacial). We calculated mega-biomes from the plant-functional types (PFTs) generated by the model to allow for a direct comparison between model results and palynological vegetation reconstructions. Our calculated mega-biomes for the pre-industrial period and the LGM corresponded well with biome reconstructions of the modern and LGM time slices, respectively, except that our pre-industrial simulation predicted the dominance of grassland in southern Europe and our LGM simulation resulted in more forest cover in tropical and sub-tropical South America. The HE1-like simulation with a glacial climate background produced sea-surface temperature patterns and enhanced inter-hemispheric thermal gradients in accordance with the "bipolar seesaw" hypothesis. We found that the cooling of the Northern Hemisphere caused a southward shift of those PFTs that are indicative of an increased desertification and a retreat of broadleaf forests in West Africa and northern South America. The mega-biomes from our HE1 simulation agreed well with paleovegetation data from tropical Africa and northern South America. Thus, according to our model-data comparison, the reconstructed vegetation changes for the tropical regions around the Atlantic Ocean were physically consistent with the remote effects of a Heinrich event under a glacial climate background.

scholarly journals Catastrophic Drought in the Afro-Asian Monsoon Region During Heinrich Event 1

Science ◽  
2011 ◽  
Vol 331 (6022) ◽  
pp. 1299-1302 ◽  
Author(s):  
J. C. Stager ◽  
D. B. Ryves ◽  
B. M. Chase ◽  
F. S. R. Pausata
Keyword(s):  
Asian Monsoon ◽  
Monsoon Region ◽  
Asian Monsoon Region ◽  
Heinrich Event ◽  
Heinrich Event 1

LGM hosing approach to Heinrich Event 1: results and perspectives from data–model integration using water isotopes

2014 ◽  
Vol 106 ◽  
pp. 247-261 ◽  
Author(s):  
Didier M. Roche ◽  
Didier Paillard ◽  
Thibaut Caley ◽  
Claire Waelbroeck
Keyword(s):  
Data Model ◽  
Water Isotopes ◽  
Model Integration ◽  
Heinrich Event ◽  
Heinrich Event 1

High resolution Secondary Ionisation Mass Spectrometry (SIMS) δ18O analyses of Hulu Cave speleothem at the time of Heinrich Event 1

2007 ◽  
Vol 238 (3-4) ◽  
pp. 197-212 ◽  
Author(s):  
P.C. Treble ◽  
A.K. Schmitt ◽  
R.L. Edwards ◽  
K.D. McKeegan ◽  
T.M. Harrison ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Heinrich Event ◽  
Ionisation Mass Spectrometry ◽  
Ionisation Mass ◽  
Heinrich Event 1

Sequence of Heinrich Event 1 to the Bølling-Allerød in transient climate model simulations

2020 ◽  
Author(s):  
Yuchen Sun ◽  
Xu Zhang ◽  
Martin Werner ◽  
Gregor Knorr ◽  
Gerrit Lohmann
Keyword(s):  
General Circulation ◽  
Meridional Overturning Circulation ◽  
Freshwater Flux ◽  
Last Deglaciation ◽  
Surface Cooling ◽  
Heinrich Event ◽  
Freshwater Forcing ◽  
The Last Deglaciation ◽  
The Impact ◽  
Heinrich Event 1

<p>During the last deglaciation, the North Atlantic was punctuated by evident millennial-scale climate variability – surface cooling during Heinrich Event 1 (H1), followed by abrupt warming during the Bølling-Allerød (BA). Given its abundance of available proxy records, the last deglaciation is thus a perfect testbed for us to assess the triggering dynamics of these abrupt events. Here, a water-isotope enabled, coupled atmosphere-ocean general circulation model COSMOS-wiso (Werner et al., 2016) is applied to test different mechanisms potentially responsible for a BA abrupt warming. First, two sets of experiments are conducted to test the sensitivity to background boundary conditions: one is based on the Last Glacial Maximum (LGM), and the other was 16ka BP background climate. We also consider the spatial distribution of freshwater flux (FWF) forcing. We find that during the LGM a weak freshwater forcing cannot trigger an Atlantic Meridional Overturning Circulation (AMOC) mode transition. However, the same freshwater forcing can rapidly weaken the AMOC at 16ka BP, including an abrupt AMOC resumption in the subsequent one thousand years. Our experiments support the idea that ice volume plays a dominant role in the stability of AMOC during the termination. Furthermore, we explore the impact of different initial fields on the timing of AMOC recovery. Based on the above 16ka hosing experiment mimicking H1, several phases before the AMOC recovery are selected as initial fields, also with different FWF forcing. Our experiments indicate that the larger the FWF forcing, the longer it would take for the AMOC to recover. In all simulations, we detect an overshoot behavior typically for the BA transition. Finally, we implement a transient experiment from H1 to BA with changing GHGs and orbital forcing to explore the mechanisms of the sequence of rapid climate changes during the last termination.</p><p>Werner, M., Haese, B., Xu, X., Zhang, X., Butzin, M., and Lohmann, G.: Glacial–interglacial changes in H218O, HDO and deuterium excess – results from the fully coupled ECHAM5/MPI-OM Earth system model, Geosci. Model Dev., 9, 647-670, doi:10.5194/gmd-9-647-2016, 2016.</p>

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