NOAA/WDS Paleoclimatology - Northeast African Precipitation and Vegetation Biomarker Data over the last 4.5 million years
This archived Paleoclimatology Study is available from the NOAA National Centers for Environmental Information (NCEI), under the World Data Service (WDS) for Paleoclimatology. The associated NCEI study type is Climate Reconstruction. The data include parameters of climate reconstructions|paleoceanography with a geographic location of Mediterranean Sea, North Atlantic Ocean. The time period coverage is from 4427000 to 11500 in calendar years before present (BP). See metadata information for parameter and study location details. Please cite this study when using the data.
- Cite as: Lupien, R.L.; Uno, K.; Rose, C.; deRoberts, N.; Hazan, C.; deMenocal, P.B.; Polissar, P.J. (2023-09-20): NOAA/WDS Paleoclimatology - Northeast African Precipitation and Vegetation Biomarker Data over the last 4.5 million years. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/rv33-6e75. Accessed [date].
- Please refer to Credit tab for full citation information.
- doi:10.25921/rv33-6e75
- noaa-recon-38561
- NCEI DSI 1200_02
- NCEI DSI 1200_01
noaa-recon-38561
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Distributor | NOAA National Centers for Environmental Information
ncei.info@noaa.gov |
Dataset Point of Contact | NOAA National Centers for Environmental Information
ncei.info@noaa.gov |
Dataset Point of Contact | Data Center Contact
NOAA World Data Service for Paleoclimatology 828-271-4800 paleo@noaa.gov |
Coverage Description | Date Range: 4427000 cal yr BP to 11500 cal yr BP; |
Time Period | -4425050 to -9550 |
Spatial Bounding Box Coordinates |
N: 34.0712
S: 33.7961
E: 32.7008
W: 32.7255
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Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed, especially in columns
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Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Data update frequency not available |
Supplemental Information |
STUDY NOTES: Leaf wax hydrogen and carbon isotope records from an Eastern Mediterranean sediment core to demonstrate precipitation and vegetation of northeast African over the last 4.5 million years. Coordinates for S1: 966A: 33.7966, 32.7016 966B: 33.7961, 32.7015 966C: 33.7963, 32.7015 966D: 33.7965, 32.7008 967A: 34.0683, 32.7254 967B: 34.0682, 32.7254 967C: 34.0712, 32.7255 967D: 34.0709, 32.7255 Provided Keywords: Paleoclimate, Northeast Africa, Organic geochemistry, Biomarkers, Precipitation, Human Evolution
ABSTRACT SUPPLIED BY ORIGINATOR: The eastern Mediterranean sapropels, paced by insolation, provide a unique archive of African monsoon strength over the Late Neogene. However, the longer-term climate of this region lacks characterization within the context of changes in ice volume, sea surface temperature gradients, and terrestrial ecosystems. Here, we examine C28 n-alkanoic acid leaf wax hydrogen and carbon isotopes in sapropels, sourced from northeast Africa, along with vegetation-corrected precipitation isotopes, derived from astronomically dated sediment cores from ODP 160 Sites 966 and 967 since 4.5 million years ago. Despite sampling only wet-phase sapropels for African monsoon variability, we find a larger range in hydrogen isotopes than previously published data across wet-dry precession cycles, indicating the importance of long-term modulation of Green Sahara phases throughout the Neogene. An influence of orbital properties on regional monsoonal hydroclimate is observed, controlling up to 50% of total hydrogen isotope variance, but large changes outside of these typical frequencies account for at least 50% of the total variance. This secular trend may track changes in ice volume, tropical sea surface temperature, sea surface temperature gradients, or even lower-frequency orbital cycles. Long-term hydroclimate and environmental shifts provide new contexts for milestone events in northeast African hominin dispersal and evolution. |
Purpose | Records of past temperature, precipitation, and other climate variables derived from paleoclimate proxies. Parameter keywords describe what was measured in this data set. Additional summary information can be found in the abstracts of papers listed in the data set citations. |
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Theme keywords | Global Change Master Directory (GCMD) Science Keywords
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Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
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Last Modified: 2024-02-01
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