noaa-lake-5454
Lake Bosumtwi, Ghana Late Quaternary Magnetic Mineral Data
Peck, J.A.; Green, R.R.; Shanahan, T.; King, J.W.; Overpeck, J.T.; Scholz, C.A.
Lake Bosumtwi, Ghana Late Quaternary Magnetic Mineral Data
2007-01-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/5454
Investigator
J.A.
Peck
Investigator
R.R.
Green
Investigator
T.
Shanahan
Investigator
J.W.
King
Investigator
J.T.
Overpeck
Investigator
C.A.
Scholz
earth science
paleoclimate
paleolimnology
volume magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleolimnology,null,magnetic susceptibility measurement with ring or loop sensor,N,x10-5 units
earth science
paleoclimate
paleolimnology
S-ratio,sediment,null,dimensionless,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
saturation isothermal remanent magnetization,sediment,null,milliampere square meter per kilogram,null,paleolimnology,null,null,N,Mrs
earth science
paleoclimate
paleolimnology
coercivity of remanence,sediment,null,millitesla,null,paleolimnology,null,null,N,Hcr
earth science
paleoclimate
paleolimnology
depth,null,null,centimeter,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
organic matter,sediment,null,weight percent,null,paleolimnology,null,loss on ignition,N,null
earth science
paleoclimate
paleolimnology
saturation isothermal magnetization,sediment,null,milliampere square meter per kilogram,null,paleolimnology,null,null,N,Ms
earth science
paleoclimate
paleolimnology
age,null,null,year Common Era,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
saturation isothermal remanent magnetization/saturation isothermal magnetization,sediment,null,dimensionless,null,paleolimnology,null,null,N,Mr/Ms
earth science
paleoclimate
paleolimnology
initial magnetization slope,sediment,null,cubic meter per kilogram,null,paleolimnology,null,null,N,IS
earth science
paleoclimate
paleolimnology
age,null,null,radiocarbon year before present,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
coercivity,sediment,null,millitesla,null,paleolimnology,null,null,N,Hc
earth science
paleoclimate
paleolimnology
coercivity of remanence/coercivity,sediment,null,dimensionless,null,paleolimnology,null,null,N,Hcr/Hc
earth science
paleoclimate
paleolimnology
age,null,null,calendar year before present,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
saturation isothermal remanent magnetization/initial magnetization slope,sediment,null,kiloampere per meter,null,paleolimnology,null,null,N,Mrs/IS
earth science
paleoclimate
paleolimnology
geochemistry
geoscientificInformation
26655 cal yr BP
152 cal yr BP
Complete
6.5
6.5
-1.4167
-1.4167
99
99
Continent
Africa
Western Africa
Ghana
Lake Bosumtwi>LATITUDE 6.5>LONGITUDE -1.4167
None
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English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
Peck, J.A., R.R. Green, T. Shanahan, J.W. King, J.T. Overpeck, C.A. Scholz. 2004. A magnetic mineral record of Late Quaternary tropical climate variability from Lake Bosumtwi, Ghana. Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 215, pp. 37- 57
We report magnetic hysteresis results from sediment cores obtained from Lake Bosumtwi, Ghana. As a hydrologically closed basin, the water budget of Lake Bosumtwi is extremely sensitive to changes in the precipitation/ evapotranspiration balance. Lake Bosumtwi lies in the path of the seasonal migration of the intertropical convergence zone (ITCZ); hence, the lake is ideally situated to study monsoon variability in West Africa. Five distinctive magnetic mineral zones (A-E) were identified in the 11-m-long sediment cores that span the last 26,000 calendar years. Prior to 12 calendar (cal) ka, low concentrations of multidomain, high-coercivity magnetic minerals are present. Three prominent shifts towards very high concentrations of high-coercivity iron sulfide (greigite) magnetic minerals are centered at 12,470, 17,290, and 22,600 calendar years during the last glacial period (magnetic zones D1-3). Between 12 and 3.2 cal ka, there is an abrupt shift to moderately high concentrations of mixed multidomain and single-domain, low-coercivity minerals and an organic-rich sapropel lithology. Since 3.2 cal ka, the magnetic mineral parameters reveal a shift to increased amounts of high-coercivity magnetic minerals.
STUDY NOTES: Physical property logging of whole core volumetric magnetic susceptibility and gammaray attenuation (an estimation of wet bulk density) was conducted on the piston cores using an automated Geotek multisensor core logger.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/africa/bosumtwi2004.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/africa/bosumtwi2004.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11