MCSST Split Equation:
Temperature (Celsius) =
A * (Temp. Channel 4 - Temp. Channel 5) +
B * (Temp. Channel 4) +
C * ((Temp. Channel 4 - Temp. Channel 5) *
(Secant of Satellite Zenith Angle - 1)) +
D
For NOAA-14 the following McClain coefficients are used in the MCSST
Split Equation, as specified in the NOAA Polar Orbiter Data User's
Guide page E-33:
A B C D
Day coefficients: 2.139588 1.017342 0.779706 -278.43
Night coefficients: 2.275385 1.029088 0.752567 -282.24
For NOAA-12 the following McClain coefficients are used in the MCSST
Split Equation, as specified in the NOAA Polar Orbiter Data User's
Guide page E-31.
A B C D
Day coefficients: 2.579211 0.963563 0.242598 -263.006
Night coefficients: 2.384376 0.967077 0.480788 -263.94
For NOAA-9 data the first 3 McClain coefficients are multipliers for
the temperature values of AVHRR channels 3, 4, and 5. Note that the
3 input temperatures are expressed in degrees Kelvin, whereas the
output temperature is in degrees Celsius (NOAA Polar Orbiter Data
User's Guide, page E-11).
A B C D
Day coefficients: 0, 3.6569, -2.6705,-268.92
Night coefficients: 0, 3.6836, -2.69, -270.42
NOAA-9 Window Split equation:
Temperature = A * Temperature (Kelvin) of Channel 3 +
(Celsius) B * Temperature (Kelvin) of Channel 4 +
C * Temperature (Kelvin) of Channel 5 +
D
For NOAA-9, it is possible to exclude a channel from the
calculations (for example, if the channel is noisy) by setting the
corresponding McClain coefficient to zero.By default, McClain coefficients are extracted from the satellite sensor file (specified by the SENSFILE parameter) but can be overwritten by the user.
EASI>MCCLAIN=a,b,c,d EASI>MCCLAIN= | Use default values extracted from SENSFILEThe McClain coefficients vary slightly according to ocean location and for large inland water bodies; however the default values are valid for almost all ocean bodies. Other McClain coefficient values can be obtained from various research papers.