TBOT in cam intial condition

[huihuojia@163_com]

There is a variable TBOT in cam intial condition file.
The description of TBOT is: TBOT:long_name = "Lowest model level temperature" ;
Because CAM uses the hybrid vertical coordinate, I don't know the lowest model level refers to the lowest midpoint layer or the lowest interface layer?

Thanks

 

[hannay]

Temperature is computed on the mid level point. TBOT is the temperature on the lowest midpoint layer. 

 

[huihuojia@163_com]

Then TBOT(time, lat, lon)=T(time, lev=26 or 30, lat, lon) ?Why seperates TBOT from T ?

 

[zarzycki]

Yes, TBOT is T(:,lev=BOT,:,:)Because, for example, if you want TBOT at high frequency, it is 30x cheaper from a data storage as well as file I/O standpoint than outputting full 3-D T.