The constant maximum velocity reached by a body, such as a water drop, falling through the atmosphere. At the terminal velocity the acceleration due to gravity is balanced by frictional air resistance (drag).
Terrain following coordinate-
A system of curvilinear coordinates such that quasi-horizontal coordinate surfaces follow the terrain near the ground, then generally become parallel to mean sea level aloft.
Threshold friction velocity-
A logarithmic measure of the relative power, or of the relative values of two flux densities, especially of sound intensities and radio and radar power densities.
Transmission-
Transmission: The process by which radiant flux is propagated through a medium or body.
Thermal diffusivity-
The length of one minute of arc along any great circle on the earths surface; since this actual distance varies slightly with latitude, a nautical mile by international agreement is defined as 1852 meters (6076.103 feet or 1.1508 statute miles).
Three dimensional variational analysis -
(3DVAR)A analysis method that solves for the atmospheric state in three dimensions by minimizing a functional that is expressed as a sum of terms representing the difference of the analysis from the observations, and the difference of the analysis from certain dynamic constraints which express the balances among the state variables. The dynamic constraints allow for observations of one variable to influence others in a way that is consistant with balanced condition for the scale being analyzed.
Tke-
Turbulent Kinetic Energy - A measure turbulence in the air. In numerical weather prediction TKE is the amount of kinetic energy contained in scales smaller than the grid resolution. In certain turbulence closure schemes TKE is the predicted model variable for turbulence.
Tsoil-
ARPS model variable: Soil temperature. In the force-restore surface physics option tsoil(i,j,1) is the surface temperature and tsoil(i,j,2) is the deep soil temperature. In the 3D soil physics option, tsoil is function of location and depth below the surface, as described by zpsoil.
