Fred Richards^1,2, Mark J Hoggard^1,3, Siavash Ghelichkhan^4,5 and Harriet C. P. Lau^1,6, (1)Harvard University, Department of Earth and Planetary Sciences, Cambridge, MA, United States, (2)Imperial College London, Earth Science and Engineering, London, United Kingdom, (3)Columbia University, Lamont-Doherty Earth Observatory, Palisades, NY, United States, (4)Ludwig Maximilians University of Munich, Munich, Germany, (5)Australian National University, Research School of Earth Sciences, Canberra, Australia, (6)University of California Berkeley, Berkeley, CA, United States