We thank Dr. John Christy (UAH), Dr. Carl Mears (RSS), and Dr. Cheng-Zhi Zou (NOAA) for their useful comments on our work, for providing us additional data related to the MSU, and their continued willingness to make clarifications about MSU data. We also thank Pu Lin for her helpful suggestions on this manuscript. This work was supported by the National Science Foundation Graduate Research Fellowship (Grant DGE-0718124) and Grant NESDIS-NESDISPO-2009-2001589 (SDS-09-15).
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