Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3521606n&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 21, CiteID L21606
Astronomy and Astrophysics
Astronomy
1
Global Change: Climate Dynamics (0429, 3309), Paleoceanography: Astronomical Forcing, Paleoceanography: Glacial, Paleoceanography: Insolation Forcing, Paleoceanography: Micropaleontology (0459, 3030)
Scientific paper
Little is known about the 100-ka ice volume cycles immediately before 1 Ma except that they are coherent with the 100-ka eccentricity cycles. Here we show that ice volume and ocean circulation change/global carbon mass balance are phase-locked and highly coupled regarding amplitude envelopes at the 100-ka band, but neither is phase-locked to and amplitude-coupled to the 100-ka eccentricity orbital forcing signal between 3-1 Ma. We describe this phasing and amplitude mismatch at the 100-ka band between 3-1 Ma between eccentricity forcing and paleo-ice volume records as the ``late Pliocene-early Pleistocene 100-ka problem.'' A free 100-ka oscillation internal to our climate system, especially those related to oscillations of atmospheric CO2 concentration, operating on an Earth characterized by a high-inertia deep thermohaline ocean that can store carbon and heat, might hold the key for the ``late Pliocene-early Pleistocene 100-ka problem.''
Fang Xiaomin
King John
Nie Junsheng
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