Global Temperature Report は，対流圏下層の気温変動のレポートである：
ここで「対流圏下層 Global Lower Troposphere (LT)」と謂うのは，地表から上空8000メートルまでの層。
レポートは，1978年12月まで溯る。
観測データ──「地球温暖化」モデルの検証に足るグレードの観測データ──は，ここまで溯るのが限度というわけである。
つぎは，GTR_202110Oct_1.docx からの引用：
As part of an ongoing joint project between UAH, NOAA and NASA, Christy and Dr. Roy Spencer, an ESSC principal scientist, use data gathered by advanced microwave sounding units on NOAA, NASA and European satellites to produce temperature readings for almost all regions of the Earth.
This includes remote desert, ocean and rain forest areas where reliable climate data are not otherwise available. ‥‥
The satellite-based instruments measure the temperature of the atmosphere from the surface up to an altitude of about eight kilometers above sea level.
Once the monthly temperature data are collected and processed, they are placed in a "public" computer file for immediate access by atmospheric scientists in the U.S. and abroad.
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