noaa-ocean-9037
Plio-Pleistocene Seawater Mg/Ca Variability Data and SST Reconstruction
Medina-Elizalde, M.; Lea, D.W.; Fantle, M.S.
Plio-Pleistocene Seawater Mg/Ca Variability Data and SST Reconstruction
2008-01-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/9037
Investigator
M.
Medina-Elizalde
Investigator
D.W.
Lea
Investigator
M.S.
Fantle
earth science
paleoclimate
climate reconstructions|paleoceanography
sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
magnesium/calcium,Trilobatus sacculifer,null,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,adjusted for Mg/Ca variation
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
geochemistry
earth science
paleoclimate
paleocean
reconstruction
earth science
paleoclimate
paleocean
age control
geoscientificInformation
Sea Surface Temperature Reconstruction
5220000 14C yr BP
0 14C yr BP
5220000 cal yr BP
0 cal yr BP
Complete
.2
.32
-95.32
159.35
-3373
-2520
Ocean
Pacific Ocean
North Pacific Ocean
ODP 806B>LATITUDE .32>LONGITUDE 159.35
Ocean
Pacific Ocean
North Pacific Ocean
ODP 847>LATITUDE .2>LONGITUDE -95.32
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
Medina-Elizalde, M., D.W. Lea, and M.S. Fantle. 2008. Implications of seawater Mg/Ca variability for Plio-Pleistocene tropical climate reconstruction. Earth and Planetary Science Letters, 269(3-4), 585-595.
Recent reconstructions of Mg and Ca concentrations of seawater indicate that seawater Mg/Ca changed significantly over the last 5 million years (Ma). Tropical sea surface temperature (SST) records for the last 5 Ma based on foraminiferal Mg/Ca paleothermometry assume constant seawater Mg/Ca. These SST records suggest that average equatorial Pacific SSTs remained thermally stable from 5 to 2 Ma, after which significant cooling occurred only in the eastern equatorial Pacific. This study examines the implications of adjusting available equatorial Pacific SST records based on Mg/Ca paleothermometry to account for the inferred past variations of seawater Mg/Ca. The results suggest that both the cold and the warm regions of the equatorial Pacific were much warmer during the early Pliocene (30-31 °C), and that both regions experienced a marked cooling from ~4 Ma to ~1 Ma. This new interpretation of foraminiferal Mg/Ca creates a discrepancy with alkenone unsaturation-based SST records from the eastern equatorial Pacific, which might be due to either overestimation of changes in past seawater Mg/Ca or to factors affecting the interpretation of the UK'37 index. The adjusted SST records are consistent with the hypothesis that higher levels of greenhouse gases maintained the warmth of the early Pliocene.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/medina-elizalde2008
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp847-tab.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/o806b-mm-tab.txt
USA/NOAA
DIF
Version 9.8.4
2019-04-29
2019-04-29