A 50,000-year record of climate oscillations from Florida and its temporal correlation with the Heinrich events

Journal Article · Fri Jul 09 00:00:00 EDT 1993 · Science (Washington, D.C.); (United States)

DOI:https://doi.org/10.1126/science.261.5118.198· OSTI ID:5985624

Grimm, E C ^[1]; Jacobson, Jr, G L; Maasch, K A ^[2]; Watts, W A ^[3]; Hansen, B C.S. ^[4]

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1. Illinois State Museum, Springfield (United States)
2. Univ. of Maine, Orono (United States)
3. Trinity College, Dublin (Ireland)
4. Univ. of Minnesota, Minneapolis (United States)

Oscillations of Pinus (pine) pollen in a 50,000-year sequence from Lake Tulane, Florida, indicate that there were major vegetation shifts during the last glacial cycle. Episodes of abundant Pinus populations indicate a climate that was more wet than intervening phases dominated by Quercus (oak) and Ambrosia-type (ragweed and marsh-elder). The Pinus episodes seem to be temporally correlated with the North Atlantic Heinrich events, which were massive, periodic advances of ice streams from the eastern margin of the Laurentide Ice Sheet. Possible links between the Tulane Pinus and Heinrich events include hemispheric cooling, the influences of Mississippi meltwater on sea-surface temperatures in the Gulf of Mexico, and the effects of North Atlantic thermohaline circulation on currents in the Gulf. 33 refs., 4 figs., 1 tab.

• OSTI ID: 5985624
• Journal Information: Science (Washington, D.C.); (United States), Vol. 261:5118; ISSN 0036-8075
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
FLORIDA
CLIMATIC CHANGE
PALEOCLIMATOLOGY
PINES
POPULATION DYNAMICS
AMBIENT TEMPERATURE
ATLANTIC OCEAN
ATMOSPHERIC PRECIPITATIONS
EARTH ATMOSPHERE
GLACIERS
GULF OF MEXICO
MISSISSIPPI RIVER
OAKS
OCEANIC CIRCULATION
POLLEN
CARIBBEAN SEA
CONIFERS
DEVELOPED COUNTRIES
GAMETES
GERM CELLS
MAGNOLIOPHYTA
MAGNOLIOPSIDA
NORTH AMERICA
PALEONTOLOGY
PINOPHYTA
PLANTS
RIVERS
SEAS
STREAMS
SURFACE WATERS
TREES
USA
540110*