Chesapeake Bay Foraminifera Counts and Paleosalinity EstimatesEntry ID: NOAA_NCDC_PALEO_2002-066
Abstract: Chesapeake Bay Foraminifera Counts and Paleosalinity Estimates. Age model
developed from lead-210, cesium-137, pollen stratigraphy, and C-14 dates.
Salinity estimates in ppt based on the relative proportions of salinity
sensitive benthic foraminifera described in Cronin et al. 2000 Geology.
Salinity oscillations caused by multidecadal climatic variability had major
impacts on the ... Chesapeake Bay estuarine ecosystem during the past 1000 yr.
Microfossils from sediments dated by radiometry (14C, 137Cs, 210Pb) and pollen
stratigraphy indicate that salinity in mesohaline regions oscillated 10-15 ppt
during periods of extreme drought (low fresh-water discharge) and wet climate
(high discharge). During the past 500 yr, 14 wet-dry cycles occurred,
including sixteenth and early seventeenth century megadroughts that exceeded
twentieth century droughts in their severity. These droughts correspond to
extremely dry climate also recorded in North American tree-ring records and by
early colonists. Wet periods occurred every ~60-70 yr, began abruptly, lasted
<20 yr, and had mean annual rainfall ~25%-30% and fresh-water discharge
~40%-50% greater than during droughts. A shift toward wetter regional climate
occurred in the early nineteenth century, lowering salinity and compounding
the effects of agricultural land clearance on bay ecosystems.
Data Set Citation
Dataset Originator/Creator: Cronin, T., et al.
Dataset Title: Chesapeake Bay Foraminifera Counts and Paleosalinity Estimates
Dataset Series Name: IGBP PAGES/WDC CONTRIBUTION SERIES NUMBER: 2002-066
Dataset Release Date: October 2002
Dataset Release Place: Boulder, CO
Dataset Publisher: IGBP PAGES/World Data Center for Paleoclimatology
Issue Identification: 2002-066
Other Citation Details: NOAA/NCDC Paleoclimatology ProgramOnline Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/cron...
Start Date: 1450-01-01Stop Date: 1996-12-31
Paleo Temporal Coverage
Paleo Start Date: 600 ybp
Paleo Stop Date: 0 ybp
Data Set Progress
Distribution Media: online ftp
Distribution Format: ascii
Email: tcronin at usgs.gov
U.S. Geological Survey 12201 Sunrise Valley Drive
Province or State: VA
Postal Code: 20192
Cronin, T., D. Willard, A. Karlsen, S. Ishman, S. Verardo, J. McGeehin, R.
Kerhin, C. Holmes, S. Colman, and A. Zimmerman, 2000, Climatic variability in the eastern United States over the past millennium from Chesapeake Bay
sediments. Geology: Vol. 28, No. 1, pp. 3-6.
Stuiver, M. and Reimer, P. 1993. Extended 14C data base and revised CALIB 3.0 14C age calibration program. Radiocarbon v. 35, p. 215-230.
Creation and Review Dates
DIF Creation Date: 2004-08-05
Last DIF Revision Date: 2004-08-05