A heat reservoir is like a storage tank for heat where energy can be stored or transferred to and from. It is used to maintain a desired temperature or to store excess heat for later use. Full definition
This study investigates the processes that control the stratification and hence the build - up of the subsurface heat reservoir in theWeddell Sea. (gfdl.noaa.gov)
The ocean is the largest heat reservoir in the climate system (Levitus et al., 2000, 2001). (nap.edu)
CM2.5 features a weaker subsurface heat reservoir than CM2.6 due to weak stratification associated with episodes of gravitational instability and enhanced vertical mixing of heat, resulting in an erosion of the reservoir. (gfdl.noaa.gov)