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 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.846497, 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, https://doi.org/10.1002/2015GL064215
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Abstract:
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.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
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
Event(s):
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 * Method/Device: Composite Core (COMPCORE) * Comment: 149 cores; 1414.4 m cored; 0 m drilled; 90.2% recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Ford, Heather L | Geocode – mcd | |
| 2 | AGE | Age | ka BP | Ford, Heather L | Geocode | |
| 3 | Globorotalia tumida, Magnesium/Calcium ratio | G. tumida Mg/Ca | mmol/mol | Ford, Heather L | ICP-OES, Inductively coupled plasma - optical emission spectrometry | |
| 4 | Sub-surface temperature | SubT | °C | Ford, Heather L | Calculated from Mg/Ca ratios (Mohtadi et al. 2011) | |
| 5 | Sample code/label | Sample label | Ford, Heather L | DSDP/ODP/IODP sample designation |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1356 data points