noaa-ocean-13538
Eastern Equatorial Pacific Early Pliocene Mg/Ca Subsurface Temperature
Ford, H.L.; Ravelo, A.C.; Hovan, S.
Eastern Equatorial Pacific Early Pliocene Mg/Ca Subsurface Temperature
2012-11-13
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/13538
Investigator
H.L.
Ford
Investigator
A.C.
Ravelo
Investigator
S.
Hovan
earth science
paleoclimate
paleoceanography
delta 13C,Globorotalia tumida,null,per mil PDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth,null,null,meter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
sea water temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,based on Globorotalia tumida (depth habitat ~50-100m)
earth science
paleoclimate
paleoceanography
age,null,null,million years ago,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
magnesium/calcium,Globorotalia tumida,null,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,Site Hole Core Type Section Interval-cm
earth science
paleoclimate
paleoceanography
delta 18O,Globorotalia tumida,null,per mil PDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
geochemistry
earth science
paleoclimate
paleocean
oxygen isotopes
earth science
paleoclimate
paleocean
carbon isotopes
earth science
paleoclimate
paleocean
reconstruction
geoscientificInformation
Sea Surface Temperature Reconstruction
thermal maximum
5880000 cal yr BP
0 cal yr BP
Complete
-2.98
7.2
-110.52
-109.75
-3853
-3714
Ocean
Pacific Ocean
North Pacific Ocean
ODP 849>LATITUDE .18>LONGITUDE -110.52
Ocean
Pacific Ocean
South Pacific Ocean
ODP 848B>LATITUDE -2.98>LONGITUDE -110.47
Ocean
Pacific Ocean
North Pacific Ocean
ODP 853B>LATITUDE 7.2>LONGITUDE -109.75
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
Ford, H.L., Ravelo, A.C., and Hovan, S. 2012.
A deep Eastern Equatorial Pacific thermocline during the early Pliocene warm period.
Earth and Planetary Science Letters, Vol. 355-356, pp. 152-161. DOI: 10.1016/j.epsl.2012.08.027
During the early Pliocene warm period (~4.6-4.2 Ma) in the Eastern Equatorial Pacific upwelling region, sea surface temperatures were warm in comparison to modern conditions. Warm upwelling regions have global effects on the heat budget and atmospheric circulation, and are argued to have contributed to Pliocene warmth. Though warm upwelling regions could be explained by weak winds and/or a deep thermocline, the temporal and spatial evolution of the equatorial thermocline is poorly understood. Here we reconstruct temporal and spatial changes in subsurface temperature to monitor thermocline depth and show the thermocline was deeper during the early Pliocene warm period than it is today. We measured subsurface temperature records from Eastern Equatorial Pacific ODP transect Sites 848, 849, and 853 using Mg/Ca records from Globorotalia tumida, which has a depth habitat of ~50-100 m. In the early Pliocene, subsurface temperatures were ~4-5°C warmer than modern temperatures, indicating the thermocline was relatively deep. Subsurface temperatures steeply cooled ~2-3°C from 4.8 to 4.0 Ma and continued to cool an additional 2-3°C from 4.0 Ma to present. Compared to records from other regions, the data suggests the pronounced subsurface cooling between 4.8 and 4.0 Ma was a regional signal related to restriction of the Isthmus of Panama, while continued cooling from 4.0 Ma to present was likely related to global processes that changed global thermocline structure. Additionally, the spatial evolution of the equatorial thermocline along a N-S transect across ODP Sites 853, 849 and 848 suggests an intensification of the southeast trades from the Pliocene to present. Large-scale atmospheric and oceanographic circulation processes link high and low latitude climate through their influence on equatorial thermocline source water regions and consequently the equatorial thermocline. Through these low latitude/high latitude linkages, changes in the equatorial thermocline and thermocline source water played an important role in the transition from the warm Pliocene to the cold Pleistocene.
STUDY NOTES: Mg/Ca paleothermometry from the planktonic foraminifera Globorotalia tumida from the past ~5 Ma at Ocean Drilling Program (ODP) Site 848 in the eastern equatorial Pacific
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https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/ford2012/ford2012odp848.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/ford2012/ford2012odp853.txt
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https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/ford2012/ford2012odp849.txt
USA/NOAA
DIF
Version 9.8.4
2019-04-29
2019-04-29