de.pangaea.dataset825259 und dataset PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact 2026-05-01T00:01:28Z https://doi.pangaea.de/10.1594/PANGAEA.825259 2012-01-01 publication https://doi.org/10.1594/PANGAEA.825259 Seki, Osamu

seki@pop.lowtem.hokudai.ac.jp

author Schmidt, Daniela N

D.Schmidt@bristol.ac.uk

https://orcid.org/0000-0001-8419-2721 information author Schouten, Stefan

Stefan.Schouten@nioz.nl

author Hopmans, Ellen C

ellen.hopmans@nioz.nl

https://orcid.org/0000-0002-8209-1334 information author Sinninghe Damsté, Jaap S

jaap.damste@nioz.nl

https://orcid.org/0000-0002-8683-1854 information author Pancost, Richard D

R.D.Pancost@bristol.ac.uk

https://orcid.org/0000-0003-0298-4026 information author PANGAEA

info@pangaea.de

https://www.pangaea.de/ information publisher tableDigital 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, https://doi.org/10.1029/2011PA002158 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. completed Seki, Osamu

seki@pop.lowtem.hokudai.ac.jp

principalInvestigator ODP Ocean Drilling Program theme 1995-01-01 creation PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-3.0: Creative Commons Attribution 3.0 Unported textTable und geoscientificInformation -86.4446833333333 -86.4446833333333 5.84283333333333 5.84283333333333 2002-05-20T00:00:00 2002-05-20T00:00:00 AGE physicalMeasurement ka BP ka BP Sea surface temperature, annual mean physicalMeasurement Calculated from UK'37 (Müller et al, 1998); UK'37 °C °C Sea surface temperature, annual mean physicalMeasurement Calculated from TEX86 (Kim et al., 2010); TEX86 °C °C Sea surface temperature, annual mean physicalMeasurement SST from Mg/Ca ratios; Globorotalia tumida, seawater adjusted °C °C Sea surface temperature, annual mean physicalMeasurement SST from Mg/Ca ratios; Neogloboquadrina dutertrei, seawater adjusted °C °C Sea surface temperature, annual mean physicalMeasurement SST from Mg/Ca ratios; Globigerinoides sacculifer, seawater adjusted °C °C text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.825259?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: 202-1241 * LATITUDE: 5.842833 * LONGITUDE: -86.444683 * DATE/TIME: 2002-05-20T00:00:00 * ELEVATION: -2026.8 m * PENETRATION: 932.9 m * RECOVERY: 810.1 m * LOCATION: North Pacific Ocean * CAMPAIGN: Leg202 * BASIS: Joides Resolution * METHOD/DEVICE: Composite Core 86 cores; 799 m cored; 133.9 m drilled; 101.4 % recovery 2002-05-20T00:00:00