Lower-Tropospheric Temperature (TLT) Climate Data Record Using NOAA/NESDIS/STAR Recalibrated MSU Observations Wenhui Wang 1 & Cheng-Zhi Zou 2 1 IMSG at NOAA/NESDIS/STAR 2 NOAA/NESDIS/Center for Satellite Applications and Research IGARSS Vancouver, Canada July 25-29, 2011
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Lower-Tropospheric Temperature (TLT) Climate Data Record Using NOAA/NESDIS/STAR
Recalibrated MSU Observations
Wenhui Wang1 & Cheng-Zhi Zou2
1IMSG at NOAA/NESDIS/STAR2NOAA/NESDIS/Center for Satellite Applications and Research
IGARSSVancouver, Canada July 25-29, 2011
• Background
• Methods for Developing TLT Product Using NOAA/NESDIS/STAR Recalibrated MSU Radiances
• Results and Discussion
• Summary and Future Works
Outline
Background• Microwave Sounding Unit (MSU, 1978/11-2006/9)
• 11 scan angles: 0 – 47.35°• Widely used in long-term atmospheric Tb trends studies
• MSU Lower Tropospheric Temperature (TLT) – TMT Affected by stratosphere cooling effect– TLT: weighted average of TMT Tb at different view angles (Spencer and Christy, 1992,2003; Mears and Wentz, 2009)
Background• Two MSU TLT products available Using NOAA pre-launch calibrated observations
– University of Alabama group (UAH)– Remote Sensing Systems group (RSS)
• Major Issues need to addressed– Calibration Errors (Warm Target Contamination)– Orbital Decay Effect– Diurnal Drift Effect
• TLT trends have important policy making implications• Purpose of this study
– Generate STAR TLT product using NOAA/NESDIS/STAR recalibrated MSU radiances
– Comparing STAR TLT with other two research groups
1. Using NOAA/NESDIS/STAR Recalibrated MSU Radiances (v1.2) (Zou et al. 2006, 2009, 2010)
– Simultaneous Nadir Overpass (SNO) Method to generate consistent climate data records (CDR)
http://www.star.nesdis.noaa.gov/smcd/emb/mscat/mscatmain.htm– Remove Warm Target (WT) Contamination at root level– Can reduce inter-satellite bias by an order of magnitude