# The Greek Alphabet and Some Meterology/Climatology Use of Symbols

 Name Capital Letter Small Letter A Few Common Climatological Uses Alpha Α α α – surface albedo, a measure of surface reflectivity Beta Β β β – rate of change of Coriolis parameter with change in latitude Gamma Γ γ Γd – dry adiabatic lapse rate (9.8K·km-1 but we’ll use 10°C/km) Delta Δ δ Δ – the change in some parameter (ex. ΔT = change in temperature) Epsilon Ε ε ε – the emissivity of a body, the effectiveness of emitting energy from it’s surface Zeta Ζ ζ ζ – zenith angle – at noon, the angle between the sun and the vertical Eta Η η Theta Θ θ θ – angle of a light ray Iota Ι ι Kappa Κ κ Lambda Λ λ λ – wavelength of electromagnetic radiation Mu Μ μ μm – micrometer (one millionth of a meter), used to measure small wavelengths Nu Ν ν ν – frequency (number of waves passing a fixed location per second) Xi Ξ ξ Omicron Ο ο Pi Π π π – represents a value of 3.1415926535897932384626… (we’ll use 3.1416) Rho Ρ ρ ρ – density Sigma Σ σ Σ – summation, represents “the sum of” Tau Τ τ τ – perihelion date, when Earth is closest to the Sun in its annual orbit Upsilon Υ υ Phi Φ φ Φ – latitude Chi Χ χ Psi Ψ ψ Omega Ω ω ω – angular velocity, how fast an object is rotating

# Some Common Constants Used in Equations

 Constant Value of the Constant Used in These Equations Absolute Zero (0K) officially 0K = -273.15°C; we’ll round to -273°C Stefan-Boltzmann Constant (σ) officially 5.670374419…×10-8 Wm-2K-4; we’ll use 5.67 x 10-8 Wm-2K-4 Stefan-Boltzman Radiation Law Wein’s Displacement Law Speed of Light in a Vacuum (co) officially 299,792,458 m/s; we’ll round to 3 x 108 m/s Speed of Sound Standard Sea-level Pressure (PSTP) officially 101.325 kPa; we’ll round to 101.3 kPa Latent Heat of Fusion (Lf) 3.34 x 105 J/kg Latent Heat of Vapourization (Lv) 2.5 x 106 J/kg