[1] Univ Leicester, Ctr Landscape & Climate Res, Sch Geog Geol & Environm, Leicester LE1 7RH, Leics, England
[2] Univ Alcala, Dept Geol Geog & Environm, Madrid 28801, Spain
[3] CALTECH, Jet Prop Lab, Radar Sci & Engn Grp, Pasadena, CA 91125 USA
[4] Univ Leicester, Ctr Landscape & Climate Res, Sch Geog Geol & Environm, Leicester LE1 7RH, Leics, England
[5] Univ Leicester, Natl Ctr Earth Observat, Leicester LE1 7RH, Leics, England