1. “Snowfall” in Earth’s core and the nature of the inner-core boundary Jeffrey Pigott – Mineral Physics (Ohio State) Jackie Li – Mineral Physics (U of Michigan) Bin Chen – Mineral Physics ( U of Michigan) Matt Armentrout – Mineral Physics (UCLA) Antonio Buono – Mineral Physics (MIT) John Hernlund – Geodynamics (UC-Berkeley) Jodi Gaeman – Geodynamics (U of Maryland) Lauren Waszek – Seismology (Cambridge)

2. CIDER 2010 - KITP Outer Core Inner Core F-layer PREM AK135 PREM2 Zou et al., 2008 (JGR) Chen et al., 2008 (GRL) Hauck et al., 2006 (JGR)

3.  Nov 2010  Equations of state, melting curves, compositional gradients  Project still broadly defined in terms of interdisciplinary aspect MP meeting (Ann Arbor)/2010 Fall AGU

4. MP meeting (Ann Arbor, Nov 2011)  Parameter space for “snowing” using seismic, experimental, and theoretical constraints  Snowing – Fe-S, Fe-C?, Fe-Si?  No snow – Pure Fe, Fe- H, likely Fe-C and Fe-Si  Relationship between melting curve and adiabat  Can solid/liquid fraction account for Vp gradient? Top of F-layer

5. Geodynamics  Evolution of thermal, compositonal, and structural profiles with time  Stability of F-layer  Origin of stratified layer

6. Comments and Suggestions  Defined leadership role  Positives  Easy exchange among different disciplines at CIDER  Helpful interaction within MP sub-group  Collaboration that otherwise would not have occurred  Negatives  Difficulty following up with interdisciplinary communication  Short (~3-5 day) semi-annual workshops for established groups  Difficulty generating a concrete product  Viewed as a “side-project”