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January 17, 2012 |
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A Dynamical Systems Approach to a Conceptual Climate Model, Anna Barry, Boston University |
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A coupled system consisting of an Energy Balance Model,
moving iceline, and forcing due to greenhouse gases is
explored using techniques from dynamical systems. |
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January 25, 2012 |
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Widiasih's Theorem and a Few of its Consequences, Jim
Walsh, Oberlin College |
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Esther Widiasih has considered energy balance models from a
dynamical systems perspective with considerable success. We present Widiasih's
Theorem, along with applications thereof to variants of the standard Budyko-Sellers
model. |
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February 1, 2012 |
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An Estimate of the Widiasih Parameter,
Richard McGehee, School of Mathematics |
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Esther Widiasih introduced a dynamic ice line equation into the Budyko energy balance model. The equation contains a parameter controlling the rate at which the ice line advances and retreats. Paleoclimate data can be used to estimate the value of the parameter. |
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February 8, 2012 |
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The Temperature Proxy Controversy,
Larry Gray, School of Mathematics |
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In 2010, the two statisticians McShane and Wyner published a paper in
which they raised serious doubts about the way in which various
"temperature proxies", such as tree ring and ice core data, have
been used to estimate global mean temperatures from the past 1000
years. This paper caused such an uproar that an entire issue of the
Annals of Applied Statistics was devoted to it, with about a dozen
papers attacking and defending the work. This talk will be a mostly
non-technical overview of the debate. Bring your hockey sticks. |
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February 22, 2012 |
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Isotopes as Climate Proxies,
Richard McGehee, School of Mathematics |
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Isotopes of hydrogen, carbon, and oxygen are used extensively as proxies for temperature, ice volume, and biological activities. This presentation will be an introductory discussion of how they are measured and interpreted. |
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February 29, 2012 |
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Milankovitch cycles as viewed through Budyko-Sellers' model during the Eocene,
Samantha Oestreicher, School of Mathematics |
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March 7, 2012 |
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Periodic fluctuations in deep water formation due to sea ice,
Raj Saha, Mathematics and Climate Research Network |
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March 21, 2012 |
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A report on Kerry Emanuel's paper, "A simple model of multiple climate regimes," Robert Foldes, School of Mathematics |
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Reference: Emanuel, K. (2002), A simple model of multiple climate regimes, J. Geophys. Res., 107(D9), 4077, doi:10.1029/2001JD001002 |
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March 28, 2012 |
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The effect of carbon dioxide on Earth's radiation budget, Jim Walsh, Oberlin College |
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An introductory talk on the radiation balance of planets and the effect atmospheric carbon dioxide has on this balance. A few remarks will be made concerning the outgoing long wave radiation term in Budyko's energy balance model. |
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April 4, 2012 |
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Stommel's Ocean Circulation Box Model, Julie Leifeld, School of Mathematics |
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Reference: Henry Stommel. (1961), Thermohaline Convection with Two Stable Regimes of Flow, Tellus 13, 224-230, DOI: 10.1111/j.2153-3490.1961.tb00079.x
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April 18, 2012 |
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Ecosystem effects of CO2 concentration:
a paper review on how C3 & C4 plants interact with
CO2 concentration in paleodata,
Samantha Oestreicher, School of Mathematics |
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Photosynthesis in C3 plants is different than that of
C4 plants. C4 plants have adapted for low levels of
CO2 while C3 plants prefer levels of atmospheric CO2
which are much higher than current values. The differences in plant functionality
ought to be present in paleodata and global climate modeling attempts. We discuss
these questions as addressed by the paper "Ecosystem effects of
CO2 concentration: evidence from past climates"
by I.C. Prentice and S. P. Harrison,
DOI: 10.5194/cp-5-297-2009 |
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