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SUMMARY:Reconstructing a deep time Earth system: The penultimate ice house
  - Prof Isabel Motañez (UC Davis) and Sophia Macarewich (U Michigan)
DTSTART:20210422T140000Z
DTEND:20210422T150000Z
UID:TALK154516@talks.cam.ac.uk
CONTACT:Oliver Shorttle
DESCRIPTION:Earth system science\, the study of our planet as an integrate
 d set of subsystems that drive planetary function is applicable to the geo
 logic past\, i.e.\, the deep time\, made possible by the advent of high pr
 ecision radioisotope dating\, the potential for astronomically calibrating
  stratigraphic intervals\, and the application of Earth System (climate) M
 odels and process-based ecosystem models to deep time studies. In this tal
 k we discuss three components of our collective effort to develop a ‘who
 le-Earth’ reconstruction of the penultimate icehouse—the Late Paleozoi
 c Ice Age (LPIA)\, ~300 Ma. For the first component\, we present a multi-p
 roxy record of atmospheric CO2 over 40 million years of this icehouse and 
 its turnover to a permanent greenhouse revealing CO2 variability (~160 and
  750 ppm) in-step with the glaciation history and with repeated restructur
 ing of Pangaean tropical biomes on the eccentricty to million-year scales.
  In the second component\, we couple the atmospheric composition records w
 ith plant fossil measurements and process-based ecosystem modelling to rec
 onstruct the paleo-physiology/functioning of the extinct plants and to sug
 gest possible ecosystem-scale vegetation-climate-CO2 feedbacks that would 
 have influenced water cycling\, surface runoff and weatherability\, and or
 ganic carbon burial. In the third component\, we use an isotope-enabled Ea
 rth system model to simulate the influence of glacial-interglacial fluctua
 tions in atmospheric CO2 on epicontinental to global-scale ocean circulati
 on and oxygen isotopic composition. This ‘systems’ perspective of the 
 Earth’s penultimate icehouse reveals unique insights into the response o
 f land-atmosphere-ocean interactions to a range of atmospheric CO2 within 
 that projected for our future.\n\n
LOCATION:https://zoom.us/j/98188045146
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