Interhemispheric linkage of paleoclimate during the last glaciation

Author(s): Denton, G. H.; Heusser, C. J.; Lowell, T. V.; Moreno, P. I.; Andersen, B. G.; Heusser, L. E.; Schlüchter, C.; Marchant, D. R.
Author Affiliation(s): Primary:
University of Maine, Orono, ME, United States
100 Clinton Roar, Tuxedo, NY, United States
University of Cincinnati, Cincinnati, OH, United States
University of Oslo, Oslo, Norway
Volume Title: Geografiska Annaler. Series A: Physical Geography
Source: Geografiska Annaler. Series A: Physical Geography, 81(2), p.107-153. Publisher: Svenska Saellskapet foer Antropologi och Geografi, Stockholm, Sweden. ISSN: 0435-3676 CODEN: GAPGAP
Note: In English
Summary: Combined glacial geologic and palynologic data from the southern Lake District, Seno Reloncavi, and Isla Grande de Chiloe in middle latitudes (40°35'-42°25'S) of the Southern Hemisphere Andes suggest (1) that full-glacial or near-full-glacial climate conditions persisted from about 29,400 to 14,550 14C yr BP in late Llanquihue time, (2) that within this late Llanquihue interval mean summer temperature was depressed 6°-8°C compared to modern values during major glacier advances into the outer moraine belt at 29,400,26,760, 22,295-22,570, and 14,550-14,805 14C yr BP, (3) that summer temperature depression was as great during early Llanquihue as during late Llanquihue time, (4) that climate deteriorated from warmer conditions during the early part to colder conditions during the later part of middle Llanquihue time, (5) that superimposed on long-term climate deterioration are Gramineae peaks on Isla Grande de Chiloe that represent cooling at 44,520-47,110 14C yr BP (T-11), 32,105-35,764 14C yr BP (T-9), 24,895-26,019 14C yr BP (T-7), 21,430-22,774 14C yr BP (T-5), and 13,040-15,200 14C yr BP (T-3),(6) that the initial phase of the glacial/interglacial transition of the last termination involved at least two major steps, one beginning at 14,600 14C yr BP and another at 12,700-13,000 14C yr BP, and (7) that a late-glacial climate reversal of ≤2-3°C set in close to 12,200 14C yr BP, after an interval of near-interglacial warmth, and continued into Younger Dryas time.
Year of Publication: 1999
Research Program: DSDP Deep Sea Drilling Project
Key Words: 24 Surficial Geology, Quaternary Geology; Andes; Angiospermae; Antarctica; Argentina; Atlantic Ocean; Australasia; Biostratigraphy; Cenozoic; Chile; Cooling; Deep Sea Drilling Project; Glaciation; Gramineae; Heinrich events; Hydrology; Ice; Isotope ratios; Isotopes; Lake District; Marine sediments; Monocotyledoneae; New Zealand; North Atlantic; O-18/O-16; Oxygen; Paleoclimatology; Plantae; Pleistocene; Quaternary; Sediments; South America; Southern Andes; Southern Hemisphere; Spermatophyta; Stable isotopes; Temperature; Upper Pleistocene; Upper Quaternary
Record ID: 2000006875
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique, Vandoeuvre-les-Nancy, France

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