Citation:

2012PA002347

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Abstract:

Understanding changes in export production through time provides insight into the response of the biological pump to global climate change, particularly during periods of rapid climate change. In this study we consider what role changes in export production may have had on carbon sequestration and how this may have contributed to the onset of the Eocene-Oligocene transition (EOT). In addition, we consider if these export production variations are dominantly controlled by orbitally driven climate variability. To accomplish these objectives, we report changes in export production in the Eastern Equatorial Pacific (EEP) from Site U1333 across the EOT reconstructed from a high-resolution record of marine barite accumulation rates (BAR). BAR fluctuations suggest synchronous declines in export production associated with the two-step increases in oxygen isotopes that define the transition. The reduction in productivity across the EOT suggests that the biological pump did not contribute to carbon sequestration and the cooling over this transition. We also report a previously undocumented peak in EEP export productivity before the EOT onset. This peak is consistent with export production proxies from the Southern Ocean, potentially implying a global driver for this precursor event. We propose that this enhanced export production and the associated carbon sequestration in the late Eocene may have contributed to the pCO2 drawdown at the onset of Antarctic glaciation.

Project(s):

Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)

Coverage:

Latitude: 10.516596 * Longitude: -138.419090

Minimum DEPTH, sediment/rock: 113.23 m * Maximum DEPTH, sediment/rock: 166.35 m

Event(s):

320-U1333C * Latitude: 10.516596 * Longitude: -138.419090 * Elevation: -4853.8 m * Campaign: (Pacific Equatorial Age Transect I) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 24 cores; 177 m cored; 100 % recovered; 177 m penetrated

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Erhardt, Andrea M	DSDP/ODP/IODP sample designation
2	DEPTH, sediment/rock	Depth sed	m	Erhardt, Andrea M		Geocode – given in composite depth (adj tw CCSF-A)
3	AGE	Age	ka BP	Erhardt, Andrea M		Geocode – AGE [ka] gives the paleomagnetic ages of 320-U1333C
4	Age, reference	Age ref	ka	Erhardt, Andrea M		199-1218, age from Coxall and Wilson, 2011, doi:10.1029/2010PA002021
5	Density, dry bulk	DBD	g/cm³	Erhardt, Andrea M
6	Sedimentation rate	SR	cm/ka	Erhardt, Andrea M		based on 320-U1333 age model, smoothed linear
7	Sedimentation rate	SR	cm/ka	Erhardt, Andrea M		based on 199-1218 age model, smoothed linear
8	Accumulation rate, mass	MAR	g/cm²/ka	Erhardt, Andrea M		based on 320-U1333 age model
9	Accumulation rate, mass	MAR	g/cm²/ka	Erhardt, Andrea M		based on 199-1218 age model
10	Sample mass	Samp m	g	Erhardt, Andrea M		starting
11	Mass	Mass	mg	Erhardt, Andrea M		final barite weight
12	Barite	Brt	%	Erhardt, Andrea M		wt.%
13	Accumulation rate, barite	Acc rate Brt	mg/cm²/ka	Erhardt, Andrea M		based on 320-U1333 age model
14	Accumulation rate, barite	Acc rate Brt	mg/cm²/ka	Erhardt, Andrea M		based on 199-1218 age model

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

3038 data points

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