Radfrc-
ARPS model variable: Radiation forcing
Radiative boundary conditions-
With this procedure the variables at the lateral boundaries are changed in the model integration so as to minimize reflection of outward propagating perturbations to the flow, back into the model domain.
Raing-
ARPS model variable: Grid supersaturation rain.
Rainc-
ARPS model variable: Cumulus convective rain.
Radsw-
ARPS model variable: Solar radiation reaching the surface.
Radswnet-
ARPS model variable: Net shortwave radiation, Swin-Swout.
Radlwin-
ARPS model variable: Incoming longwave radiation.
Reflection-
Reflection: The process whereby a surface of discontinuity turns back a portion of the incident radiation into the medium through which the radiation approached. For true reflection to occur there must be a real discontinuity of the index of refraction or at least it must change over an interfacial layer of thickness small compared to the wavelength of the radiation.
Reflection coefficient-
1.The radio of the amplitude of the reflected wave and the amplitude of the incident wave. 2. At a discontinuity in a transmission line, the complex ratio of the electric field strength of the reflected wave to that of the incident wave. Note1: The reflection coefficient may also be established using other field or circuit quantities.
Reynolds number-
The dimensionless ratio of the inertial force ('∼'U2/L) to the viscous force ('∼'U/L2) in the Navier–Stokes equations, where U is a characteristic velocity, L is a characteristic length, and '∼' is the kinematic viscosity of the fluid; thus, The Reynolds number is of great importance in the theory of hydrodynamic stability and the origin of turbulence. The inertia force generates vortex stretching and nonlinear interactions and hence creates randomness. Turbulence occurs when the inertia term dominates the viscous term, that is, when the Reynolds number is large. For many engineering flows, turbulence occurs when Re greater than Rec, where the critical
Reynolds number is roughly Rec = 2100. See large Reynolds number flow. Named for Osborne Reynolds, British fluid dynamics engineer. Named for Osborne Reynolds, British fluid dynamics engineer.
Rhobar-
ARPS model variable: Base state density.
Rofus-
ARPS model variable: Surface roughness.
