noaa-ocean-11924
Middle Eocene Climatic Optimum Stable Isotope Data
Bohaty, S.M.; Zachos, J.C.; Florindo, F.; Delaney, M.L.
Middle Eocene Climatic Optimum Stable Isotope Data
2011-08-19
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/11924
Investigator
S.M.
Bohaty
Investigator
J.C.
Zachos
Investigator
F.
Florindo
Investigator
M.L.
Delaney
earth science
paleoclimate
paleoceanography
depth,null,null,meter,null,paleoceanography,composited,null,N,null
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,sample material (fine; bulk; etc)
earth science
paleoclimate
paleoceanography
delta 13C,Cibicidoides sp.,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth at sample start,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 13C,carbonate,null,per mil VPDB,null,paleoceanography,null,null,N,bulk carbonate or fine fraction (mostly calcareous nannofossils)
earth science
paleoclimate
paleoceanography
depth,null,null,meter,null,paleoceanography,averaged,null,N,null
earth science
paleoclimate
paleoceanography
age,null,null,million years ago,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth,null,null,meter,null,paleoceanography,null,null,N,mbsf
earth science
paleoclimate
paleoceanography
delta 18O,carbonate,null,per mil VPDB,null,paleoceanography,null,null,N,bulk carbonate or fine fraction (mostly calcareous nannofossils)
earth science
paleoclimate
paleoceanography
delta 18O,Cibicidoides sp.,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
oxygen isotopes
earth science
paleoclimate
paleocean
carbon isotopes
geoscientificInformation
43000000 cal yr BP
38000000 cal yr BP
Complete
-64.517
30.0529
-76.357633
82.7878
-4562
-1290
Ocean
Southern Ocean
ODP 738B>LATITUDE -62.709>LONGITUDE 82.7878
Ocean
Southern Ocean
ODP 689B>LATITUDE -64.517>LONGITUDE 3.0999
Ocean
Southern Ocean
ODP1263B>LATITUDE -28.5327>LONGITUDE 2.7794
Ocean
Southern Ocean
ODP523>LATITUDE -28.5522>LONGITUDE -2.2513
Ocean
Southern Ocean
ODP748>LATITUDE -58.441>LONGITUDE 78.9981
Ocean
Southern Ocean
ODP702B>LATITUDE -50.946>LONGITUDE -26.36865
Ocean
Atlantic Ocean
North Atlantic Ocean
ODP 1051>LATITUDE 30.0529>LONGITUDE -76.357633
None
Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.
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
Bohaty, S.M., J.C. Zachos, F. Florindo, and M.L. Delaney. 2009.
Coupled greenhouse warming and deep-sea acidification in the middle Eocene.
Paleoceanography, 24, PA2207, doi:10.1029/2008PA001676.
The Middle Eocene Climatic Optimum (MECO) is an enigmatic warming
event that represents an abrupt reversal in long-term cooling
through the Eocene. In order to further assess the timing and nature
of this event, we have assembled stable isotope and calcium carbonate
concentration records from multiple Deep Sea Drilling Project
and Ocean Drilling Program sites for the time interval between
~43 and 38 Ma. Revised stratigraphy at several sites and compilation
of d18O records place peak warming during the MECO event at 40.0 Ma
(Chron C18n.2n). The identification of the d18O excursion at sites
in different geographic regions indicates that the climatic effects
of this event were globally extensive. The total duration of the MECO
event is estimated at ~500 ka, with peak warming lasting <100 ka.
Assuming minimal glaciation in the late middle Eocene, ~4°-6°C total
warming of both surface and deep waters is estimated during the MECO
at the study sites. The interval of peak warming at ~40.0 Ma also
coincided with a worldwide decline in carbonate accumulation at sites
below 3000 m depth, reflecting a temporary shoaling of the calcite
compensation depth. The synchroneity of deepwater acidification
and globally extensive warming makes a persuasive argument that
the MECO event was linked to a transient increase in atmospheric pCO2.
The results of this study confirm previous reports of significant
climatic instability during the middle Eocene. Furthermore, the direct
link between warming and changes in the carbonate chemistry of the deep
ocean provides strong evidence that changes in greenhouse gas
concentrations exerted a primary control on short-term climate
variability during this critical period of Eocene climate evolution.
STUDY NOTES: Stable isotope data from 7 marine sediment cores distributed
around the global ocean for the Middle Eocene (~43 and 38 Ma).
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bohaty2009/bohaty2009.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bohaty2009/bohaty2009.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11