Contribution of Southern Ocean surface-water stratification to low atmospheric CO2 concentrations during the last glacial period

Nature ◽  
10.1038/40073 ◽  
1997 ◽  
Vol 389 (6654) ◽  
pp. 929-935 ◽  
Author(s):  
Roger François ◽  
Mark A. Altabet ◽  
Ein-Fen Yu ◽  
Daniel M. Sigman ◽  
Michael P. Bacon ◽  
...  
Keyword(s):  
Surface Water ◽  
Southern Ocean ◽  
Ocean Surface ◽  
Atmospheric Co2 ◽  
Glacial Period ◽  
Last Glacial Period ◽  
Last Glacial ◽  
Water Stratification ◽  
Atmospheric Co2 Concentrations ◽  
The Last Glacial

scholarly journals Controls on Millennial-Scale Atmospheric CO2 Variability During the Last Glacial Period

2018 ◽  
Vol 45 (15) ◽  
pp. 7731-7740 ◽  
Author(s):  
T. K. Bauska ◽  
E. J. Brook ◽  
S. A. Marcott ◽  
D. Baggenstos ◽  
S. Shackleton ◽  
...  
Keyword(s):  
Atmospheric Co2 ◽  
Glacial Period ◽  
Last Glacial Period ◽  
Last Glacial ◽  
The Last Glacial ◽  
Millennial Scale

scholarly journals Greater supply of Patagonian-sourced detritus and transport by the ACC to the Atlantic sector of the Southern Ocean during the last glacial period

2012 ◽  
Vol 317-318 ◽  
pp. 374-385 ◽  
Author(s):  
Taryn L. Noble ◽  
Alexander M. Piotrowski ◽  
Laura F. Robinson ◽  
Jerry F. McManus ◽  
Claus-Dieter Hillenbrand ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Glacial Period ◽  
Last Glacial Period ◽  
Atlantic Sector ◽  
Last Glacial ◽  
The Last Glacial

Southern Patagonian glacial chronology for the Last Glacial period and implications for Southern Ocean climate

2008 ◽  
Vol 27 (3-4) ◽  
pp. 284-294 ◽  
Author(s):  
M.R. Kaplan ◽  
C.J. Fogwill ◽  
D.E. Sugden ◽  
N.R.J. Hulton ◽  
P.W. Kubik ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Glacial Period ◽  
Last Glacial Period ◽  
Ocean Climate ◽  
Last Glacial ◽  
Glacial Chronology ◽  
The Last Glacial

scholarly journals Stalagmite evidence for East Asian winter monsoon variability and 18O-depleted surface water in the Japan Sea during the last glacial period

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Shota Amekawa ◽  
Kenji Kashiwagi ◽  
Masako Hori ◽  
Tomomi Sone ◽  
Hirokazu Kato ◽  
...  
Keyword(s):  
Surface Water ◽  
Meteoric Water ◽  
East Asian ◽  
Japan Sea ◽  
Glacial Period ◽  
Last Glacial Period ◽  
Last Glacial ◽  
Asian Winter Monsoon ◽  
The Japan Sea ◽  
The Last Glacial

AbstractIn the East Asian monsoon area, stalagmites generally record lower and higher oxygen isotope (δ18O) levels during warm humid interglacial and cold dry glacial periods, respectively. Here, we report unusually low stalagmite δ18O from the last glacial period (ca. 32.2–22.3 ka) in Fukugaguchi Cave, Niigata Prefecture, Japan, where a major moisture source is the East Asian winter monsoon (EAWM) that carries vapor from the warm surface of the Japan Sea. The δ18O profile of this stalagmite may imply millennial-scale changes, and high δ18O intervals that are related to Dansgaard–Oeschger (D–O) interstadials. More importantly, the stalagmite exhibits low overall δ18O values; the mean δ18O (− 8.87‰) is distinctly lower than the mid-Holocene mean of another stalagmite from the same cave (4.2–8.2 ka, − 7.64‰). An interpretation assuming a more intense EAWM and greater vapor transportation during the last glacial period, compared with the mid-Holocene, contradicts the limited inflow of the Tsushima Warm Current into the Japan Sea because of lowered sea level. Additionally, our model calculation using δ18O data from meteoric water indicated that the amount effect of winter meteoric water was insignificant (1.2‰/1000 mm). Low stalagmite δ18O for the last glacial period in Fukugaguchi Cave most likely resulted from 18O-depleted surface water, which developed in the isolated Japan Sea. The estimated amplitude of the δ18O decrease in surface water was ~ 3‰ at most, consistent with the abnormally low values for foraminifera (by ~ 2.5‰) in sediment during the last glacial period, shown by samples collected from the Japan Sea. This is the first terrestrial evidence of 18O depletion in Japan Sea surface water during the last glacial period.

scholarly journals Volcanic forcing and climate variations during the last glacial period

2012 ◽  
Vol 8 (5) ◽  
pp. 4941-4956
Author(s):  
A. F. Flinders
Keyword(s):  
Late Quaternary ◽  
Ice Core ◽  
Greenland Ice Sheet ◽  
Volcanic Eruptions ◽  
Temporal Variations ◽  
Atmospheric Co2 ◽  
Glacial Period ◽  
Last Glacial Period ◽  
Last Glacial ◽  
The Last Glacial

Abstract. Measurements of δ18O in the Greenland Ice Sheet Project 2 (GISP2) ice-core from Summit, Greenland, show repeated temporal variations associated with rapid warming events throughout the last glacial period of the Pleistocene-10–110 kya. The majority of these warming events are preceded in the ice-core record by an increased concentration of insoluble micro-particulate sulfate, indicative of increases in global volcanism. Wavelet analysis of ice-core and marine-sediment records show a repeated 5000–6000 yr periodicity in both volcanic SO4 and δ18O ice records, as well as a 5000–8000 yr cycle in the lithic concentration of ice-rafted debris, atmospheric CO2 concentration, and a database of late Quaternary volcanic eruptions. Increasing concentrations in atmospheric CO2 and CH4 initiated during periods of increased volcanism, peaking during a warm transition, reflect a volcanic-atmospheric-deglaciation feedback, regulated by meridional overturning current-shutdown related cooling.

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