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Ford, Heather L; Ravelo, Ana Christina; Dekens, Petra S; LaRiviere, Jonathan P; Wara, Michael W (2015): Mg/Ca ratio of Globorotalia tumida and subsurface temperature reconstruction for ODP Site 130-806. PANGAEA,, Supplement to: Ford, HL et al. (2015): The evolution of the equatorial thermocline and the early Pliocene El Padre mean state. Geophysical Research Letters, 42(12), 4878-4887,

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The tropical Pacific thermocline strength, depth, and tilt are critical to tropical mean state and variability. During the early Pliocene (~3.5 to 4.5 Ma), the Eastern Equatorial Pacific (EEP) thermocline was deeper and the cold tongue was warmer than today, which resulted in an mean state with a reduced zonal sea surface temperature gradient, or El Padre. However, it is unclear whether the deep thermocline was a local feature of the EEP or a basin-wide condition with global implications. Our measurements of Mg/Ca of Globorotalia tumida in a western equatorial Pacific site indicate Pliocene subsurface temperatures warmer than today; thus, El Padre included a basin-wide thermocline that was relatively warm, deep, and weakly tilted. At ~4 Ma, thermocline steepening was coupled to cooling of the cold tongue. Since ~4 Ma, the basin-wide thermocline cooled/shoaled gradually, with implications for thermocline feedbacks in tropical dynamics and the interpretation of TEX86-derived temperatures.
Latitude: 0.318667 * Longitude: 159.361000
Date/Time Start: 1990-02-17T00:00:00 * Date/Time End: 1990-02-25T00:00:00
Minimum DEPTH, sediment/rock: 0.35 m * Maximum DEPTH, sediment/rock: 147.44 m
130-806 * Latitude: 0.318667 * Longitude: 159.361000 * Date/Time Start: 1990-02-17T00:00:00 * Date/Time End: 1990-02-25T00:00:00 * Elevation: -2520.5 m * Penetration: 1603.2 m * Recovery: 1275.9 m * Location: North Pacific Ocean * Campaign: Leg130 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 149 cores; 1414.4 m cored; 0 m drilled; 90.2% recovery
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmFord, Heather LGeocode – mcd
2AGEAgeka BPFord, Heather LGeocode
3Globorotalia tumida, Magnesium/Calcium ratioG. tumida Mg/Cammol/molFord, Heather LICP-OES, Inductively coupled plasma - optical emission spectrometry
4Subsurface temperatureSubT°CFord, Heather LCalculated from Mg/Ca ratios (Mohtadi et al., 2011)
5Sample code/labelSample labelFord, Heather LODP sample designation
1356 data points

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