It can appear in documentation for the Community Land Model , where variables like TG represent ground temperature.
In environmental reports, such as those from NOAA or the DTIC , TG1 often serves as a label for a specific "Tide Gauge" or water-level measurement station used to track sea levels and currents. tg1.txt
Knowing the will help me provide the exact technical details or summary you need! Boston Harbor Navigation Channel Improvement Project - DTIC It can appear in documentation for the Community