noaa-ocean-6412
Eastern Mediterranean (ODP967) Aeolian Hematite Data
Larrasoaña, J.C.; Roberts, A.P.; Rohling, E.J.; Winklhofer, M.; Wehausen, R.
Eastern Mediterranean (ODP967) Aeolian Hematite Data
2003-07-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/6412
Investigator
J.C.
Larrasoaña
Investigator
A.P.
Roberts
Investigator
E.J.
Rohling
Investigator
M.
Winklhofer
Investigator
R.
Wehausen
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,corrected,null,N,null
earth science
paleoclimate
paleoceanography
age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
isothermal remanent magnetization,sediment,null,dimensionless,null,paleoceanography,null,null,N,imparted w/induction of 0.9T
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
physical properties
earth science
paleoclimate
paleocean
age control
geoscientificInformation
3029653 14C yr BP
0 14C yr BP
3029653 cal yr BP
0 cal yr BP
Complete
34.07
34.07
32.72
32.72
-2553
-2553
Ocean
Indian Ocean
ODP 967>LATITUDE 34.07>LONGITUDE 32.72
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
Larrasoaņa, J.C., A.P. Roberts, E.J. Rohling, M. Winklhofer, and R. Wehausen. 2003. Three million years of monsoon variability over the northern Sahara. Climate Dynamics, 21, 689-698.
We present a 3 million year record of aeolian dust supply into the eastern Mediterranean Sea, based on hematite contents derived from magnetic properties of sediments from Ocean Drilling Program Site 967. Our record has an average temporal resolution of ~400 years. Geochemical data validate this record of hematite content as a proxy for the supply of aeolian dust from the Sahara. We deduce that the aeolian hematite in eastern Mediterranean sediments derives from the eastern Algerian, Libyan, and western Egyptian lowlands located north of the central Saharan watershed (~21°N). In corroboration of earlier work, we relate dust flux minima to penetration of the African summer monsoon front to the north of the central Saharan watershed. This would have enhanced soil humidity and vegetation cover in the source regions, in agreement with results from ""green Sahara"" climate models. Our results indicate that this northward monsoon penetration recurred during insolation maxima throughout the last 3 million years. As would be expected, this orbital precession-scale mechanism is modulated on both short (~100-kyr) and long (~400-kyr) eccentricity time scales. We also observe a strong expression of the ~41-kyr (obliquity) cycle, which we discuss in terms of high- and low-latitude mechanisms that involve Southern Hemisphere meridional temperature contrasts and shifts in the latitudes of the tropics, respectively. We also observe a marked increase in sub-Milankovitch variability around the mid-Pleistocene transition (~0.95 Ma), which suggests a link between millennial-scale climate variability, including monsoon dynamics, and the size of northern hemisphere ice sheets.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp967-tab.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/larrasoana2003
USA/NOAA
DIF
Version 9.8.4
2019-06-07
2019-06-07