"I pick, therefore I grin"
Denise Palmer, M.S.
student (D. Hollander, advisor)
College of Marine Science
University of South Florida
B.S., 2003, Geology, The University of South Florida,
Climate variability during the Late Holocene using foraminiferal assemblages
from Orca Basin
Advisors: Richard Z. Poore (USGS), Terrence Quinn Ph.D, David Hollander
The Holocene has evidence of oscillating warm and cold periods, with the
most recent extremes known respectively as the Medieval Warm Period (MWP)
and the Little Ice Age (LIA). Little is known about the causes of these
transitions. Some researchers believe the high frequency variability is
cased by external solar forcing while others believe the variation is
caused by internal dynamics of the global climate system.
We are producing a high resolution late Holocene (0-2kbp) foraminiferal
assemblage record taken for a 55 cm sediment core deposited under oxic
conditions on the western flank of the Orca Basin, Gulf of Mexico. Preliminary
data of the warm water indicators Globigerinoides ruber are showing a
warming trend from the middle of the LIA to the present and appears to
show periodic variability. The results will be compared with the faunal
and geochemical data from a similar depositional setting to the west,
the Pigmy Basin, in order to demonstrate regionally coherent trends in
climate variability on multi-decadal to centennial timescales.