The Upper Troposphere and Lower Stratosphere Mean Layer Temperature (MLT) Climate Data Record (CDR) provides calibrated MLT data spanning both atmospheric regions. Input comes from the long-term variation of Brightness Temperature (BT) measurements from Advanced Microwave Sounder Unit (AMSU) channel 7 and Microwave Sounding Unit (MSU) channel 3 that peak in the upper troposphere and lower stratosphere. These peaks provide the necessary signal to produce the monthly MLT for both atmospheric regions. The AMSU Data (level-1b) is calibrated with high-quality radiosonde observations identified by coincident Global Positioning System (GPS) Radio Occultation (RO) temperature profile measurements. The calibrated MSU/AMSU data in the period of 2001-2014 serve as reference data to calibrate other overlapped MSU/AMSU data from 1980-2001. The final record has global coverage, and extends from 1986–2019.
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