10.1594/PANGAEA.54788
Müller, Peter J
Peter J
Müller
Kirst, Georg
Georg
Kirst
Ruhland, Götz
Götz
Ruhland
Von Storch, Isabel
Isabel
Von Storch
Rosell-Melé, Antoni
Antoni
Rosell-Melé
0000-0002-5513-2647
Alkenones and SST of surface sediments (Appendix)
PANGAEA
1998
LATITUDE
LONGITUDE
Event label
Elevation of event
DEPTH, sediment/rock
Alkenone, unsaturation index UK'37
Sea surface temperature, annual mean
Sea surface temperature, production weighted
Giant box corer
MultiCorer
MiniCorer
Calculated from C37 alkenones (Brassell et al., 1986)
M6/6
M9/4
M12/1
M16/1
M20/1
M20/2
SO84
M23/1
SO86
M34/1
ANT-VIII/3
ANT-XI/2
Meteor (1986)
Sonne
Polarstern
Geosciences, University of Bremen (GeoB)
South Atlantic in Late Quaternary: Reconstruction of Budget and Currents (SFB261)
1988-02-20T00:00:00/1996-01-16T00:00:00
en
Supplementary Dataset
10.1016/S0016-7037(98)00097-0
447 data points
text/tab-separated-values
Creative Commons Attribution 3.0 Unported
We have analysed alkenones in 149 surface sediments from the eastern South Atlantic in order to establish a sediment-based calibration of the U37K' paleotemperature index. Our study covers the major tropical to subpolar production systems and sea-surface temperatures (SST's) between 0° and 27°C. In order to define the most suitable calibration for this region, the U37K' values were correlated to seasonal, annual, and production-weighted annual mean atlas temperatures and compared to previously published culture and core-top calibrations. The best linear correlation between U37K' and SST was obtained using annual mean SST from 0 to 10 m water depth (U37K' = 0.033 T + 0.069, r**2 = 0.981). Data scattering increased significantly using temperatures of waters deeper than 20 m, suggesting that U37K' reflects mixed-layer SST and that alkenone production at thermocline depths was not high enough to significantly bias the mixed-layer signal. Regressions based on both production-weighted and on actual annual mean atlas SST were virtually identical, indicating that regional variations in the seasonality of primary production have no discernible effect on the U37K' vs. SST relationship. Comparison with published core-top calibrations from other oceanic regions revealed a high degree of accordance. We, therefore, established a global core-top calibration using U37K' data from 370 sites between 60°S and 60°N in the Atlantic, Indian, and Pacific Oceans and annual mean atlas SST (0-29°C) from 0 m water depth. The resulting relationship (U37K' = 0.033 T + 0.044, r**2 = 958) is identical within error limits to the widely used E. huxleyi calibrations of and attesting their general applicability. The observation that core-top calibrations extending over various biogeographical coccolithophorid zones are strongly linear and in better accordance than culture calibrations suggests that U37K' is less species-dependent than is indicated by culture experiments. The results also suggest that variations in growth rate of algae and nutrient availability do not significantly affect the sedimentary record of U37K' in open ocean environments.
Supplement to: Müller, Peter J; Kirst, Georg; Ruhland, Götz; Von Storch, Isabel; Rosell-Melé, Antoni (1998): Calibration of the alkenone paleotemperature index UK'37 based on core-tops from the eastern South Atlantic and the global ocean (60°N-60°S). Geochimica et Cosmochimica Acta, 62(10), 1757-1772
-18.69
17.76
-55.47
1.8
Walvis Ridge
Guinea Basin
Equatorial Atlantic
Brazil Basin
Romanche fracture zone
Cape Basin
Kongo delta
Northern Guinea Basin
Southwest Guinea Basin
West Angola Basin
Mid Atlantic Ridge
East Brazil Basin
Congo Fan
off Kunene
Namibia Continental Margin
South African margin
Angola Diapir Field
Angola Benguela Front
Southern Cape Basin
Northern Cape Basin
Van Heesen Ridge
Agulhas Basin
Meteor Rise
Shona Ridge
Indian-Antarctic Ridge
Atlantic Ridge
South Sandwich Basin
Agulhas Ridge
South Atlantic