Tim Palmer CBE FRS (1952-), British mathematical physicist, climate modeler at Oxford University Garth Paltridge (1940-), Australian atmospheric physicist David E. Parker, British, surface temperature trend Fyodor Panayev (1856-1933), Russian climatologist Graeme Pearman OA FAAS (1941-), Australian climatologist William Richard Peltier (1943-), Canadian, global geodynamic modeling and ice sheet reconstructions; atmospheric and oceanic waves and turbulence. Jean Robert Petit, French paleoclimatologist, emeritus director of research at Centre national de la recherche scientifique David Phillips OC (1944-), Canadian climatologist and meteorologist Roger A. Pielke, Sr. (1946-), American, climate change, environmental vulnerability, numerical modeling, and atmospheric dynamics Raymond Pierrehumbert, idealized climate modeling, Faint young sun paradox Andrew Pitman (1964-), British, terrestrial processes in global and regional climate modelling, model evaluation and earth systems approaches to understanding climate change.