Planetary Science Directorate


Upcoming SwRI Boulder Colloquia

Colloquia are normally on Tuesdays at 11:00 am in the 4th-floor conference room, except as indicated below in bold text.
Show previous colloquia

For questions or suggestions for speakers, please contact the SwRI colloquium organizers:
Hannah Kaplan, 720-208-7208 or kaplan(at)
Derek Lamb, 720-208-7207 or derek(at)
Katie Primm, 720-240-0124 or kprimm(at)
Raluca Rufu, 303-226-0879 or raluca(at)
Julien Salmon, 720-208-7203 or julien(at)
Kelsi Singer, 303-226-5910 or ksinger(at)

To be added to the SwRI Boulder Colloquia email list, please contact Kelsi Singer, ksinger(at)

Tue Jul 30, 201911:00 am Eran Vos Weizmann Institute of Science Milankovitch-Driven Evolution of Ice Reservoirs on Mars
Abstract: The layered polar caps of Mars have long been thought to be related to variations in orbit and axial tilt. We use a Mars Global Circulation Model (GCM) and a Subsurface Ice Model to dynamically link Mars’s past climate variations with the stratigraphy and isotopic composition of its ice deposits, by modeling the exchange of H2O and HDO among three primary reservoirs. The models show that the interplay among equatorial and North-Polar Layered Deposits (NPLD) induces significant isotopic variations in the cap. The diffusive properties of the sublimation lags and dust content in our model result in a cap size consistent with current Mars. In addition, from high resolution GCM simulations, we find that the D/H ratio varies geographically and we quantify the dependence of the relevant water fluxes and temperatures on past orbital condition. D/H Isotopic sampling of the top 100 meters may reveal climate oscillations unseen in the layer thicknesses and would thus probe recent precession-driven climate cycles.
Tue Aug 20, 201911:00 am On Hold - ask Kelsi
Tue Aug 27, 201911:00 am On Hold - ask Kelsi
Tue Sep 3, 201911:00 am David Polishook Weizmann Institute of Science TBD