noaa-ocean-8454
Indonesian Gateway DSDP214 Pliocene Paired d18O and Mg/Ca Data
Karas, C.; Nuernberg, D.; Gupta, A.K.; Tiedemann, R.; Mohan, K.; Bickert, T.
Indonesian Gateway DSDP214 Pliocene Paired d18O and Mg/Ca Data
2009-07-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/8454
Investigator
C.
Karas
Investigator
D.
Nuernberg
Investigator
A.K.
Gupta
Investigator
R.
Tiedemann
Investigator
K.
Mohan
Investigator
T.
Bickert
earth science
paleoclimate
paleocean
trace metals in carbonates
earth science
paleoclimate
paleocean
oxygen isotopes
earth science
paleoclimate
paleocean
age control
geoscientificInformation
5461000 14C yr BP
2013000 14C yr BP
5461000 cal yr BP
2013000 cal yr BP
Complete
-11.337
-11.337
88.718
88.718
-1665
-1665
Ocean
Indian Ocean
DSDP 214>LATITUDE -11.337>LONGITUDE 88.718
None
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English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
Karas, C., D. Nürnberg, A.K. Gupta, R. Tiedemann, K. Mohan, and T. Bickert. 2009. Mid-Pliocene climate change amplified by a switch in Indonesian subsurface throughflow. Nature Geoscience, 2, 434 - 438.
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.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/karas2009
USA/NOAA
DIF
Version 9.8.4
2019-01-30
2019-01-30