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Deglacial climate variability in central Florida, USA

Palaeogeography, Palaeoclimatology, Palaeoecology

By:
, , , , , and
DOI: 10.1016/j.palaeo.2007.04.016

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Abstract

Pollen and ostracode evidence from lacustrine sediments underlying modern Tampa Bay, Florida, document frequent and abrupt climatic and hydrological events superimposed on deglacial warming in the subtropics. Radiocarbon chronology on well-preserved mollusk shells and pollen residue from core MD02-2579 documents continuous sedimentation in a variety of non-marine habitats in a karst-controlled basin from 20 ka to 11.5 ka.


During the last glacial maximum (LGM), much drier and cooler-than-modern conditions are indicated by pollen assemblages enriched in Chenopodiaceae and Carya, with rare Pinus (< 10%). Pinus pollen increased to 20–40% during the warming of the initial deglaciation (∼ 17.2 ka), reaching near modern abundance (60–80%) during warmer, moister climates of the Bølling/Allerød interval (14.7–12.9 ka). Within the Bølling/Allerød, centennial-scale dry events corresponding to the Older Dryas and Intra-Allerød Cold Period indicate rapid vegetation response (< 50 years) to climate variability. The Younger Dryas (12.9–11.6 ka) was characterized by two distinct phases: slightly drier than the peak Bølling/Allerød between 12.9 and 12.3 ka and much drier from 12.3 to 11.5 ka. The Tampa Bay record of deglacial atmospheric temperature and moisture can be correlated with other paleoclimate records in the North Atlantic region and has implications for climate-forcing by ice-sheet fluctuation, thermohaline circulation, and atmospheric circulation.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Deglacial climate variability in central Florida, USA
Series title:
Palaeogeography, Palaeoclimatology, Palaeoecology
DOI:
10.1016/j.palaeo.2007.04.016
Volume
251
Issue:
3-4
Year Published:
2007
Language:
English
Publisher:
Elsevier
Contributing office(s):
Coastal and Marine Geology Program
Description:
17 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Palaeogeography, Palaeoclimatology, Palaeoecology
First page:
366
Last page:
382
Country:
United States
State:
Florida
Other Geospatial:
Tampa Bay