Estimate of mid-Pliocene Paleo-pCO2 for ODP Hole 130-806 (Table 1)

Three million years ago, prior to the onset of northern hemisphere glaciation, global mean temperatures may have been as much as 3.5 °C warmer than at present. We present evidence, based on the carbon isotopic composition of marine organic matter, that atmospheric CO2 levels at this time were on ave...

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Bibliographic Details
Main Authors: Raymo, Maureen E, Grant, B, Horowitz, Michael, Rau, Greg H
Format: Dataset
Language:English
Published: PANGAEA 1996
Subjects:
-
130-806
AGE
Carbon/Nitrogen ratio
COMPCORE
Composite Core
DEPTH
sediment/rock
DSDP/ODP/IODP sample designation
Joides Resolution
Leg130
North Pacific Ocean
Ocean Drilling Program
ODP
Partial pressure of carbon dioxide (ambient atmosphere)
Sample code/label
Sea surface temperature
annual mean
δ13C
dissolved inorganic carbon
organic carbon
North Atlantic
Sea ice
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.681721
https://doi.org/10.1594/PANGAEA.681721
Description
Summary:Three million years ago, prior to the onset of northern hemisphere glaciation, global mean temperatures may have been as much as 3.5 °C warmer than at present. We present evidence, based on the carbon isotopic composition of marine organic matter, that atmospheric CO2 levels at this time were on average only about 35% higher than the preindustrial value of 280 ppm. We also present carbon isotopic evidence for stronger thermohaline circulation in the Atlantic Ocean during the warmest intervals and propose that the North Atlantic “conveyor belt” may act as a positive feedback to global warming by enhancing sea ice retreat and decreasing high latitude albedo. Based on our results, it seems unlikely that the mid Pliocene warm period was a doubled CO, world.

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