High-latitude forcing of interhemispheric anti-phased precipitation during the last glacial-interglacial cycle

2006 ◽  
Vol 70 (18) ◽  
pp. A687
Author(s):  
X. Wang ◽  
A.S. Auler ◽  
R.L. Edwards ◽  
H. Cheng
Keyword(s):  
High Latitude ◽  
Last Glacial ◽  
The Last Glacial

High-Latitude Forcing of the South American Summer Monsoon During the Last Glacial

Science ◽  
2012 ◽  
Vol 335 (6068) ◽  
pp. 570-573 ◽  
Author(s):  
L. C. Kanner ◽  
S. J. Burns ◽  
H. Cheng ◽  
R. L. Edwards
Keyword(s):  
Summer Monsoon ◽  
High Latitude ◽  
South American ◽  
The South ◽  
Last Glacial ◽  
The Last Glacial

scholarly journals South African speleothems reveal influence of high- and lowlatitude forcing over the past 113.5 k.y.

Geology ◽  
2021 ◽  
Author(s):  
Brian Chase ◽  
Chris Harris ◽  
Maarten J. de Wit ◽  
Jan Kramers ◽  
Sean Doel ◽  
...  
Keyword(s):  
South African ◽  
High Latitude ◽  
Austral Summer ◽  
Summer Rainfall ◽  
Last Glacial ◽  
Change Dynamics ◽  
The Past ◽  
Stage 4 ◽  
Insolation Forcing ◽  
The Last Glacial

Variation in δ18O and δ13C values in a speleothem from the Cango Caves in southernmost South Africa enable the construction of coherent regional composite records spanning the past 113,500 yr. Novel for the region in terms of both their length and detail, these records indicate environmental and climatic changes that both are consistent with records from the wider region and show a clear evolution from low- to high-latitude forcing dominance across the last glacial period. Prior to ca. 70 ka, the influence of direct low-latitude insolation forcing is expressed through increases in summer rainfall during austral summer insolation maxima. With the onset of Marine Isotope Stage 4, cooler global conditions and the development of high-latitude ice sheets appear to have supplanted direct insolation forcing as the dominant driver pacing patterns of environmental change, with records from the Southern and Northern Hemisphere tropics exhibiting a positive relationship until after the Last Glacial Maximum. These results highlight the complexity of South African climate change dynamics as a response to changing global boundary conditions and provide a critical reference for regional and global comparisons.

scholarly journals Major diversification of caribou shaped by glacial cycles before the Last Glacial Maximum

2020 ◽  
Author(s):  
Rebecca S. Taylor ◽  
Micheline Manseau ◽  
Cornelya F. C. Klütsch ◽  
Jean L. Polfus ◽  
Audrey Steedman ◽  
...  
Keyword(s):  
Last Glacial Maximum ◽  
High Latitude ◽  
Glacial Maximum ◽  
Effective Population ◽  
Glacial Cycles ◽  
Last Glacial ◽  
Genetic Patterns ◽  
Population Sizes ◽  
The Last Glacial Maximum ◽  
The Last Glacial

AbstractPleistocene glacial cycles influenced the diversification of high-latitude wildlife species through recurrent periods of range contraction, isolation, divergence, and expansion from refugia and subsequent admixture of refugial populations. For many taxa, research has focused on genetic patterns since the Last Glacial Maximum (LGM), however glacial cycles before the LGM likely impacted genomic variation which may influence contemporary genetic patterns. We investigate diversification and the introgressive history of caribou (Rangifer tarandus) in western Canada using 33 high-coverage whole genomes coupled with larger-scale mitochondrial data. Contrary to the well-established paradigm that caribou ecotypes and contemporary genetic diversity arose from two major lineages in separate refugia during the LGM, a Beringian-Eurasian (BEL) and a North American (NAL) lineage, we found that the major diversifications of caribou occurred much earlier at around 110 kya, the start of the last glacial period. Additionally, we found effective population sizes of some caribou reaching ~700,000 to 1,000,000 individuals, one of the highest recorded historical effective population sizes for any mammal species thus far. Mitochondrial analyses dated introgression events prior to the LGM dating to 20-30 kya and even more ancient at 60 kya, coinciding with colder periods with extensive ice coverage, further demonstrating the importance of glacial cycles and events prior to the LGM in shaping demographic history. Reconstructing the origins and differential introgressive history has implications for predictions on species responses under climate change. Our results highlight the need to investigate pre-LGM demographic patterns to fully reconstruct the origin of species diversity, especially for high-latitude species.

Joint influence of surface erosion and high-latitude ice-sheet extent on Asian dust cycle during the last glacial maximum

2019 ◽  
Vol 157 (5) ◽  
pp. 777-789 ◽  
Author(s):  
Xinzhou Li ◽  
Xiaodong Liu ◽  
Haibo Zhou
Keyword(s):  
Last Glacial Maximum ◽  
High Latitude ◽  
Ice Sheet ◽  
Glacial Maximum ◽  
Gas Content ◽  
Surface Erosion ◽  
Dust Emissions ◽  
Last Glacial ◽  
The Last Glacial Maximum ◽  
The Last Glacial

AbstractThe dust cycle plays an important role in the long-term evolution of the climate and environment. In this paper, an improved climate model including aerosol processes was used to carry out a set of sensitivity experiments and comparative analyses of the effects of high-latitude ice-sheet extent and abnormal dust erosion, as well as Earth’s orbital parameters and atmospheric greenhouse gas content, on dust activities during the last glacial maximum. The comparative analysis found that incorporating the abnormal surface erosion factor alone could increase dust emissions by 2.77-fold and 3.77-fold of the present-day global and Asian dust emissions, respectively. The high-latitude ice-sheet factor caused global dust emissions to increase by 1.25-fold that of the present day. Sensitivity experiments showed that increased surface erosion in Asia during the last glacial maximum made the greatest contribution to the increased dust emissions in Asia, followed by the high-latitude ice-sheet factor, while the contributions of the greenhouse gas content and orbital parameters were relatively weak. Strong dust emissions during the glacial period were therefore not only dependent on the development of the high-latitude ice sheets but were strongly associated with the underlying surface characteristics of local dust source regions.

Abrupt changes in high-latitude nutrient supply to the Atlantic during the last glacial cycle

Geology ◽  
2012 ◽  
Vol 40 (2) ◽  
pp. 123-126 ◽  
Author(s):  
K.R. Hendry ◽  
L.F. Robinson ◽  
M.P. Meredith ◽  
S. Mulitza ◽  
C.M. Chiessi ◽  
...  
Keyword(s):  
High Latitude ◽  
Nutrient Supply ◽  
Glacial Cycle ◽  
Last Glacial ◽  
Abrupt Changes ◽  
The Last Glacial

Millennial and orbital variations of El Niño/Southern Oscillation and high-latitude climate in the last glacial period

Nature ◽  
2004 ◽  
Vol 428 (6980) ◽  
pp. 306-310 ◽  
Author(s):  
Chris S. M. Turney ◽  
A. Peter Kershaw ◽  
Steven C. Clemens ◽  
Nick Branch ◽  
Patrick T. Moss ◽  
...  
Keyword(s):  
High Latitude ◽  
El Niño ◽  
El Nino ◽  
Southern Oscillation ◽  
El Niño Southern Oscillation ◽  
El Nino Southern Oscillation ◽  
Glacial Period ◽  
Last Glacial Period ◽  
Last Glacial ◽  
The Last Glacial
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