NOAA/WDS Paleoclimatology - Niger Delta Stable Isotope and Geochemistry Data during the Last Deglaciation
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 Paleoceanography. The data include parameters of paleoceanography with a geographic location of North Atlantic Ocean. The time period coverage is from 20910 to 550 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: Parker, A.O.; Schmidt, M.W.; Jobe, Z.R.; Slowey, N.C. (2016-12-14): NOAA/WDS Paleoclimatology - Niger Delta Stable Isotope and Geochemistry Data during the Last Deglaciation. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/dj1z-xv70. Accessed [date].
- Please refer to Credit tab for full citation information.
- doi:10.25921/dj1z-xv70
- noaa-ocean-21012
- NCEI DSI 1200_02
- NCEI DSI 1200_01
noaa-ocean-21012
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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: 20910 cal yr BP to 550 cal yr BP; |
Time Period | -18960 to 1400 |
Spatial Bounding Box Coordinates |
N: 4.81
S: 4.81
E: 4.45
W: 4.45
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Spatial Coverage Map |
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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: Provided Keywords: Deglaciation, G. ruber, abrupt climate change, West African Monsoon, Mg/Ca temperature, sea surface temperature, Ba/Ca ratios, Niger delta, Younger Dryas, Heinrich Event 1, LGM
ABSTRACT SUPPLIED BY ORIGINATOR: Widespread drought characterized the Heinrich 1 and Younger Dryas cold periods of the last deglaciation throughout much of Africa, causing large increases in dust emissions from the Sahara and Sahel. At the same time, increases in wind strength may have also contributed to dust flux, making it difficult to interpret dust records alone as reflecting changes in rainfall over the region. The Niger River has the third largest drainage basin in Africa and drains most of the Sahara and Sahel and thus preserves and propagates climatic signals. Here, we present new reconstructions of Niger Delta sea surface salinity and Niger River discharge for the last 20,000 years in order to more accurately reconstruct the onset of the Western African Monsoon system. Based on calculated d18OSEAWATER(d18OSW) and measured Ba/Ca ratios in planktonic foraminifera, these new records reflect changes in sub-Saharan precipitation across the Niger River Basin in West Africa and reveal that the West African Monsoon system began to intensify several thousand years after the equatorial Monsoon system in Central Africa. We also present new records of primary productivity in the Niger Delta that are related to wind-driven upwelling and show that productivity is decoupled from changes in Niger River discharge. Our results suggest that wind strength, rather than changes in monsoon moisture, was the primary driver of dust emissions from the Sahara and Sahel across the last deglaciation. |
Purpose | Records of past climate and ocean circulation derived from marine sediments. Parameter keywords describe what was measured in this dataset. Additional summary information can be found in the abstracts of papers listed in the dataset 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: 2023-09-01
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