ECMWF ERA-40 data used in this study have been obtained from a variety of locations, including the ECMWF data server, and from the data systems section at NCAR. NNRA data were provided by the NOAA–CIRES Climate Diagnostics Center, Boulder, Colorado (from their Web site online at http://www.cdc.noaa.gov). The ISCCP DX data were obtained from the ISCCP data archives maintained by the NASA DAAC. Dave Stepaniak is thanked for his help with the ERA-40 reanalyses, discussions with Bill Rossow helped facilitate the ISCCP analysis, and Hua-Lu Pan helped provide the GFS data. The QuikSCAT Level 3 Ocean Wind Vector data are obtained from the Physical Oceanography Distributed Active Archive Center (P0.DAAC) at NASA JPL in Pasadena, California (see online at http://podaac.jpl.nasa.gov). TMI data are produced by Remote Sensing Systems and sponsored by the NASA Earth Science REASoN DISCOVER Project. (Data are available online at http://www.remss.com.) GOES-10 data were obtained from the Space Science and Engineering Data Center at the University of Wisconsin. This work was supported by NASA through Fellowship NGT530499 and Grant NAG512559. Comments by B. Albrecht, C. Bretherton, and S. Klein on an early draft of this manuscript greatly improved its presentation.
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