BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Phanerozoic seawater chemistry: Using Monte Carlo to to quantify c
 alcium\, magnesium and sulfate concentrations - Dr Ross Whiteford - Royal 
 Holloway
DTSTART:20241021T170000Z
DTEND:20241021T180000Z
UID:TALK223081@talks.cam.ac.uk
CONTACT:124546
DESCRIPTION:The concentrations of calcium\, magnesium\, and sulphate in se
 awater have changed over the Phanerozoic. We know this from data describin
 g how the concentration of each element has changed\, but additionally we 
 have independent constraints on the Mg/Ca ratio of seawater through time. 
 We also know the residence time of each of the elements and therefore have
  some sense of how rapidly each might have changed. Leveraging all this in
 formation together is a statistical challenge. We illustrate some of these
  challenges and demonstrate how we have combined Markov Chain Monte Carlo 
 with Gaussian Processes to improve our understanding of how the concentrat
 ions of these elements have evolved through time. In particular\, we impro
 ve uncertainty propagation\, finding that the uncertainty in calcium conce
 ntrations is higher than previously thought (which has implications for pa
 laeo saturation state). Overall\, our method produces robust time series w
 ith uncertainty which describe how ocean composition has evolved over the 
 Phanerozoic.
LOCATION:Harker 1 lecture room\, Department of Earth Sciences\, Downing Si
 te
END:VEVENT
END:VCALENDAR