10.1594/PANGAEA.825259
Seki, Osamu
Osamu
Seki
Schmidt, Daniela N
Daniela N
Schmidt
0000-0001-8419-2721
Schouten, Stefan
Stefan
Schouten
Hopmans, Ellen C
Ellen C
Hopmans
0000-0002-8209-1334
Sinninghe Damsté, Jaap S
Jaap S
Sinninghe Damsté
0000-0002-8683-1854
Pancost, Richard D
Richard D
Pancost
0000-0003-0298-4026
(Table S1) Neogene temperature reconstruction of ODP Site 202-1241
PANGAEA
2012
AGE
Sea surface temperature, annual mean
Composite Core
Calculated from UK'37 (Müller et al, 1998)
Calculated from TEX86 (Kim et al., 2010)
SST from Mg/Ca ratios
Leg202
Joides Resolution
Ocean Drilling Program (ODP)
2002-05-20T00:00:00
en
Supplementary Dataset
10.1029/2011PA002158
1029 data points
text/tab-separated-values
Creative Commons Attribution 3.0 Unported
To examine the Late Neogene evolution of tropical Pacific oceanography, we determined multiple geochemical proxy records for temperature (UK37' and TEX86H indices) and primary productivity (algal biomarkers and diol indices) in sediments recovered at ODP Site 1241 in the East Equatorial Pacific (EEP) spanning a record of the last 10 Myr. The TEX86H temperatures are lower than those recorded by UK37' indices, exhibiting large fluctuations and suggesting strong warming during the Mid Pliocene Warm Period (MPWP; 4.5-3.2 Ma) and significantly colder temperature during the Late Miocene cooling period (7-5 Ma) and after the Middle Pliocene Warm Period (MPWP). Such variations could reflect changes in the EEP thermocline temperatures, but we suggest that they instead reflect changes in the depth of export production of glycerol dialkyl glycerol tetraether lipids in response to changes in the upper ocean structure. A combination of temperature records, inferred to represent different and likely varying depths in the water column, as well as algal biomarker records for export production and ecosystem structure, suggest that both productivity and inference upwelling were reduced in the EEP during warmer periods, such as the MPWP and prior to 7 Ma. In contrast, stronger upwelling conditions and associated increased productivity likely prevailed from 7 to 5 Ma and for the past 3 Myr, both corresponding to globally cool intervals. A further increase in EEP productivity occurred at ca 1.8 Ma, coincident with the development of the E-W Pacific SST gradient. These results confirm previous work that protracted El Niño-like conditions prevailed during warmer intervals of the Pliocene before ultimately descending into the current climate state.
Supplement to: Seki, Osamu; Schmidt, Daniela N; Schouten, Stefan; Hopmans, Ellen C; Sinninghe Damsté, Jaap S; Pancost, Richard D (2012): Paleoceanographic changes in the Eastern Equatorial Pacific over the last 10 Myr. Paleoceanography, 27(3), PA3224
-86.4446833333333
5.84283333333333
North Pacific Ocean