A 27-year record of satellite-derived polar winds for retrospective analyses David Santek 1 , Jeffrey Key 2 , Richard Dworak 1 , Michele Rienecker 3 , Ron Gelaro 3 1 Cooperative Institute for Meteorological Satellite Studies University of Wisconsin-Madison 2 NOAA/NESDIS/STAR 3 NASA GMAO 10th International Winds Workshop Tokyo, Japan 23 February 2010