A 0.6-Million Year Record of Millennial-Scale Climate Variability in the Tropics

Posted: January 28, 2014 by tallbloke in Analysis, Cycles, data, general circulation, Natural Variation, Ocean dynamics, paleo, solar system dynamics

A 0.6-Million Year Record of Millennial-Scale Climate Variability in the Tropics†

Kelly Ann Gibson2,*, Larry C. Peterson1DOI: 10.1002/2013GL058846©2014. American Geophysical Union

Abstract

[1] A ~600-kyr long scanning X-ray fluorescence (XRF) record of redox variability from the Cariaco Basin, Venezuela, provides insight into rapid climate change in the tropics over the past five glacial-interglacial cycles. Variations in the sediment accumulation of the redox-sensitive element molybdenum (Mo) can be linked to changes in Intertropical Convergence Zone migration and reveal that millennial-scale variability is a persistent feature of tropical climate over the past 600 kyr, including during periods of interglacial warmth.

This new record supports the idea that high-frequency tropical climate variability is not controlled solely by ice volume changes, with implications for the role of high-latitude forcing of ITCZ position and tropical hydrology on millennial timescales

Link

Comments
  1. ren says:

    Tallbloke on the animation you can see exactly how a shift polar vortex causes the inflow of warm air over the Arctic Circle. It has nothing in common with “global warming.” A height of 30 km. The temperature depends only on the amount of ozone.
    http://earth.nullschool.net/#current/wind/isobaric/10hPa/orthographic=-339.64,116.24,302

  2. incaunipocrit says:

    Reblogged this on The International Blogspaper.

  3. michael hart says:

    Paywalled, unfortunately. Presumably it is an organic (biological activity) based proxy. I wonder if the Carioco basin varies its redox status a lot with global rising/falling sea levels, as the wiki article says the channels connecting it to the open Caribbean are quite shallow.

  4. incaunipocrit says:

    Reblogged this on The International Blogspaper.