NOAA/WDS Paleoclimatology - Demerara Rise d13C, d18O, Trace Metal and Reconstructed Bottom Water Temperature Data Over the Past 20 ka
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 22423 to 563 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: Oppo, D.W.; Lu, W.; Huang, K.-F.; Umling, N.E.; Guo, W.; Yu, J.; Curry, W.B.; Marchitto, T.M.; Wang, S. (2023-05-04): NOAA/WDS Paleoclimatology - Demerara Rise d13C, d18O, Trace Metal and Reconstructed Bottom Water Temperature Data Over the Past 20 ka. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/71sa-8v70. Accessed [date].
- Please refer to Credit tab for full citation information.
- doi:10.25921/71sa-8v70
- noaa-ocean-38028
- NCEI DSI 1200_02
- NCEI DSI 1200_01
noaa-ocean-38028
Search Data |
|
Download Data |
|
Distribution Formats |
|
Ordering Instructions | Contact NCEI for other distribution options and instructions. |
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: 22423 cal yr BP to 563 cal yr BP; |
Time Period | -20473 to 1387 |
Spatial Bounding Box Coordinates |
N: 44
S: -32
E: -44
W: -88
|
Spatial Coverage Map |
General Documentation |
|
Associated Resources |
|
Publication Dates |
|
Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed, especially in columns
|
Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Data update frequency not available |
Supplemental Information |
ABSTRACT SUPPLIED BY ORIGINATOR: Variations in the Atlantic Meridional Overturning Circulation (AMOC) redistribute heat and nutrients, causing pronounced anomalies of temperature and nutrient concentrations in the subsurface ocean. However, exactly how millennial-scale deglacial AMOC variability influenced the subsurface is debated, and the role of other deglacial forcings of subsurface temperature change is unclear. Here, we present a new deglacial temperature reconstruction, which, with published records, helps assess competing hypotheses for deglacial warming in the upper tropical North Atlantic. Our record provides new evidence of regional subsurface warming in the western tropical North Atlantic within the core of modern Antarctic Intermediate Water (AAIW) during Heinrich Stadial 1 (HS1), an early deglacial interval of iceberg discharge into the North Atlantic. Our results are consistent with model simulations that suggest subsurface heat accumulates in the northern high-latitude convection regions and along the upper AMOC return path when the AMOC weakens, and with warming due to rising greenhouse gases. Warming of AAIW may have also contributed to warming in the tropics at modern AAIW depths during late HS1. Nutrient and D[CO32-] reconstructions from the same site suggest a link between AMOC intensity and the northward extent of AAIW in the northern tropics across the deglaciation and on millennial time scales. However, the timing of the initial deglacial increase in AAIW to the northern tropics is ambiguous. Deglacial trends and variability of D[CO32-] in the upper North Atlantic have likely biased temperature reconstructions based on the elemental composition of calcitic benthic foraminifera.
|
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. |
Dataset Citation |
|
Cited Authors |
|
Originators |
|
Publishers |
|
Theme keywords | Global Change Master Directory (GCMD) Science Keywords
|
Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
|
Place keywords |
|
Use Constraints |
|
Access Constraints |
|
Fees |
|
Last Modified: 2023-09-12
For questions about the information on this page, please email: ncei.info@noaa.gov