1. Lamont-Doherty Earth Observatory; Columbia University; Palisades New York
2. City University of New York; City College New York New York
3. Center for International Earth Science Information Network; Columbia University; Palisades New York
4. Center for Climate Systems Research; Columbia University; New York New York
5. Wegener Center for Climate and Global Change and IGAM/Institute of Physics; University of Graz; Graz Austria