Millennial- to Century-Scale Variability in Gulf of Mexico Holocene Climate Records

Authors

R. Z. Poore, U.S. Geological Survey
H. J. Dowsett, U.S. Geological Survey
S. Verardo, U.S. Geological Survey
Terrence M. Quinn, University of South FloridaFollow

Document Type

Article

Publication Date

6-11-2003

Keywords

Holocene, Gulf of Mexico, millennial- to century-scale climate variability, solar forcing

Digital Object Identifier (DOI)

https://doi.org/10.1029/2002PA000868

Abstract

Proxy records from two piston cores in the Gulf of Mexico (GOM) provide a detailed (50–100 year resolution) record of climate variability over the last 14,000 years. Long‐term (millennial‐scale) trends and changes are related to the transition from glacial to interglacial conditions and movement of the average position of the Intertropical Convergence Zone (ITCZ) related to orbital forcing. The δ¹⁸O of the surface‐dwelling planktic foraminifer Globigerinoides ruber show negative excursions between 14 and 10.2 ka (radiocarbon years) that reflect influx of meltwater into the western GOM during melting of the Laurentide Ice Sheet. The relative abundance of the planktic foraminifer Globigerinoides sacculifer is related to transport of Caribbean water into the GOM. Maximum transport of Caribbean surface waters and moisture into the GOM associated with a northward migration of the average position of the ITCZ occurs between about 6.5 and 4.5 ka. In addition, abundance variations of G. sacculifer show century‐scale variability throughout most of the Holocene. The GOM record is consistent with records from other areas, suggesting that century‐scale variability is a pervasive feature of Holocene climate. The frequency of several cycles in the climate records is similar to cycles identified in proxy records of solar variability, indicating that at least some of the century‐scale climate variability during the Holocene is due to external (solar) forcing.

Rights Information

Terms of use for work posted in Scholar Commons.

Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

Paleoceanography and Paleoclimatology, v. 18, issue 2, art. 1048

Copyright 2003 by the American Geophysical Union.

Scholar Commons Citation

Poore, R. Z.; Dowsett, H. J.; Verardo, S.; and Quinn, Terrence M., "Millennial- to Century-Scale Variability in Gulf of Mexico Holocene Climate Records" (2003). Marine Science Faculty Publications. 112.
https://digitalcommons.usf.edu/msc_facpub/112