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


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.

Related Identifier
Metadata Access
Creator Ford, Heather L; Ravelo, Ana Christina; Dekens, Petra S; LaRiviere, Jonathan P; Wara, Michael W
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2015
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 1356 data points
Discipline Earth System Research
Spatial Coverage (159.361 LON, 0.319 LAT); North Pacific Ocean
Temporal Coverage Begin 1990-02-17T00:00:00Z
Temporal Coverage End 1990-02-25T00:00:00Z