NOAA/WDS Paleoclimatology - Plio-Pleistocene Alkenone concentration data from the Atlantic Ocean
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 South Atlantic Ocean. The time period coverage is from 4002000 to 1000 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: Lawrence, K.T.; Sigman, D.M.; Herbert, T.D.; Riihimaki, C.A.; Bolton, C.T.; Martínez-García, A.; Rosell-Melé, A.; Haug, G.H. (2017-06-16): NOAA/WDS Paleoclimatology - Plio-Pleistocene Alkenone concentration data from the Atlantic Ocean. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/ekmy-6k83. Accessed [date].
- Please refer to Credit tab for full citation information.
- doi:10.25921/ekmy-6k83
- noaa-ocean-22250
- NCEI DSI 1200_02
- NCEI DSI 1200_01
noaa-ocean-22250
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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: 4002 cal yr ka BP to 1 cal yr ka BP; Date Range: 4002000 cal yr BP to 1000 cal yr BP; |
Time Period | -4000050 to 950 |
Spatial Bounding Box Coordinates |
N: 69.25
S: -42.908333
E: 8.9
W: -32.950122
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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: Plio-Pleistocene paleoproductivity reconstruction. Provided Keywords: paleoproductivity, alkenones, opal, North Atlantic, Pliocene, Pleistocene
ABSTRACT SUPPLIED BY ORIGINATOR: Marine biological export productivity declined in high-latitude regions in the North Pacific and Southern Ocean 2.7 million years ago, in parallel with the intensification of Northern Hemisphere glaciation. Here, we present data from the North Atlantic, which show a similar but time-transgressive pattern of high-latitude productivity decline from 3.3 to 2.5 Ma, with productivity decreasing first at 69°N, hundreds of thousands of years before it declined at 58°N. We propose that the cumulative data are best explained by an equatorward migration of the westerly winds, which caused a southward shift in the zone of Ekman divergence and upwelling-associated major nutrient supply over this time interval. We suggest that a similar equatorward migration of the westerly winds may also help explain the productivity changes observed in other high latitude regions, particularly the Southern Ocean. At 2.7 Ma, equatorial and temperate Atlantic sites began to show orbitally paced productivity pulses, consistent with a shoaling and meridional contraction of the nutrient-poor “warm sphere” that characterizes the low latitude upper ocean. This timing coincides with observed productivity changes in Southern Ocean, consistent with previous findings that the Southern Ocean exerts a strong influence on the fertility of the low latitude Atlantic. Finally, we propose that the unique basin geometry of the North Atlantic caused deep water formation in this region to remain relatively stable despite equatorward migration of winds and ocean fronts. |
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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