NOAA/WDS Paleoclimatology - Indonesian Gateway DSDP214 Pliocene Paired d18O and Mg/Ca Data
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 Indian Ocean. The time period coverage is from 5461000 to 2013000 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: Karas, C.; Nürnberg, D.; Gupta, A.K.; Tiedemann, R.; Mohan, K.; Bickert, T. (2009-07-01): NOAA/WDS Paleoclimatology - Indonesian Gateway DSDP214 Pliocene Paired d18O and Mg/Ca Data. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/b2z7-3f44. Accessed [date].
- Please refer to Credit tab for full citation information.
- doi:10.25921/b2z7-3f44
- noaa-ocean-8454
- NCEI DSI 1200_02
- NCEI DSI 1200_01
noaa-ocean-8454
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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: 5461000 14C yr BP to 2013000 14C yr BP; Date Range: 5461000 cal yr BP to 2013000 cal yr BP; |
Time Period | -5459050 to -2011050 |
Spatial Bounding Box Coordinates |
N: -11.337
S: -11.337
E: 88.718
W: 88.718
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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 |
ABSTRACT SUPPLIED BY ORIGINATOR: The tectonically driven closure of tropical seaways during the Pliocene epoch (~5-2 million years (Myr) ago) altered ocean circulation and affected the evolution of climate. Plate tectonic reconstructions show that the main reorganization of one such seaway, the Indonesian Gateway, occurred between 4 and 3 Myr ago. Model simulations have suggested that this would have triggered a switch in the source of waters feeding the Indonesian throughflow into the Indian Ocean, from the warm salty waters of the South Pacific Ocean to the cool and relatively fresh waters of the North Pacific Ocean. Here we use paired measurements of the delta18O and Mg/Ca ratios of planktonic foraminifera to reconstruct the thermal structure of the eastern tropical Indian Ocean from 5.5 to 2 Myr ago. We find that sea surface conditions remained relatively stable throughout the interval, whereas subsurface waters freshened and cooled by about 4 °C between 3.5 and 2.95 Myr ago. We suggest that the restriction of the Indonesian Gateway led to the cooling and shoaling of the thermocline in the tropical Indian Ocean. We conclude that this tectonic reorganization contributed to the global shoaling of the thermocline recorded during the Pliocene epoch, possibly contributing to the development of the equatorial eastern Pacific cold tongue.
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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: 2024-04-27
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