noaa-ocean-2644
South-east Atlantic mid-Pleistocene Alkenone Data and SST Reconstruction
McClymont, E.L.; Rosell-Melé, A.; Giraudeau, J.; Pierre, C.; Lloyd, J.M.
South-east Atlantic mid-Pleistocene Alkenone Data and SST Reconstruction
2005-07-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/2644
Investigator
E.L.
McClymont
Investigator
A.
Rosell-Melé
Investigator
J.
Giraudeau
Investigator
C.
Pierre
Investigator
J.M.
Lloyd
earth science
paleoclimate
paleoceanography
age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
alkenone unsaturation index Uk37 prime,null,null,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
biomarkers
earth science
paleoclimate
paleocean
reconstruction
earth science
paleoclimate
paleocean
age control
geoscientificInformation
Sea Surface Temperature Reconstruction
1517112 14C yr BP
497630 14C yr BP
1517112 cal yr BP
497630 cal yr BP
Complete
-31.47
-31.47
15.32
15.32
-1372
-1372
Ocean
Atlantic Ocean
South Atlantic Ocean
2006-015>LATITUDE -31.47>LONGITUDE 15.32
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
McClymont, E.L., A. Rosell-Melé, J. Giraudeau, C. Pierre, and J.M. Lloyd. 2005. Alkenone and coccolith records of the mid-Pleistocene in the south-east Atlantic: Implications for the index and South African climate. Quaternary Science Reviews 24, 1559-1572.
Successful application of the alkenone palaeothermometer, the Uk'37 index, relies upon the assumption that fossil alkenone synthesisers responded to growth-temperature changes in a similar manner to the modern producers, chiefly the coccolithophores Emiliania huxleyi and Gephyrocapsa oceanica. We compare coccolith and Uk'37 data from ODP Site 1087 in the south-east Atlantic between 1500 and 500 ka, and show that evolutionary events and changes in species dominance within the coccolithophore populations had little impact on the Uk'37 record. The relative abundances of the C37 and C38 alkenones also closely resembled those found in modern populations, and suggest a similar temperature sensitivity of Uk'37 during the early and mid-Pleistocene to that found at present. These results support the application of the Uk'37 index to reconstruct sea-surface temperatures (SSTs) throughout the Quaternary. The Uk'37 record at ODP Site 1087 contains an SST signal that documents the emergence of the 100-kyr cycles that characterise the late Quaternary ice volume records. This is preceded by significant cooling at ODP Site 1087, marked by a negative shift in SSTs and a positive shift in the planktonic d18O some 250-kyr earlier, at ca 1150-1000 ka. This results in a permanent fall in average SSTs of around 1.5 °C. The predicted increase in aridity onshore as a result of this cooling can be identified in a number of published records from southern Africa, and may have played a role in some important evolutionary events of the mid-Pleistocene.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1087a-tab.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcclymont2005b
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11