5.3 Practice 4
5.3.1 Objectives
To study
– specific features of the formation of the heat radiation in cases of clear and
cloudy atmosphere and with partly cloud cover of the instrument viewing field;
– the redistribution of the surface yield forming the outgoing radiation within
spectral channels with different values of radiation absorption;
– the outgoing radiation dependence on the cloud and surface emissivity, cloud top
altitude, degrees of the surface radiative heating (cooling) within different
spectral channels.
5.3.2 Software and Set of Input Parameters
1. Computer programs “V_AERDAT.exe”, “V_TRANSM.exe” and “RAD_IR.
exe” (or “RADNIMB.exe”).
2. Tables of results of the complex temperature-wind aerological sounding whose
data are used with the program “V_AERDAT.exe” at the first step for creating
the input file for further calculation. It is possible to use the ready input files at
the address “\dz-2006\student\”. The ready file containing values of the transmission function for the radiometer at the platform « Nimbus » might be used
also with the computer program “RADNIMB.exe” and file “aer.dat”.
5.3.3 Test Questions
1. What factors influence the difference in the outgoing intensity values at different
wave numbers n?
2. What does the extent to which the outgoing intensity is affected by the surface
emissivity depends on?
5. At which wave number n used in the calculations is the cloud impact on the
outgoing intensity maximum?
4. At which wave numbers n used in the calculations is the cloud impact on
the outgoing intensity maximum?
5. Why is the brightness temperature of the outgoing radiation formed by the
system atmosphere-surface not equal to the sum of surface and atmosphere
brightness temperatures?
6. In a case, where the isothermal atmosphere temperature is equal to the surface
temperature T(x) ¼ const ¼ T(p S ) and the surface emissivity e(n) is equal to a
unit. What is the brightness temperature of the outgoing radiation equal to?
50
5 Calculation of the Intensity of Self Heat Radiation of the System
5.3.1 Objectives
To study
– specific features of the formation of the heat radiation in cases of clear and
cloudy atmosphere and with partly cloud cover of the instrument viewing field;
– the redistribution of the surface yield forming the outgoing radiation within
spectral channels with different values of radiation absorption;
– the outgoing radiation dependence on the cloud and surface emissivity, cloud top
altitude, degrees of the surface radiative heating (cooling) within different
spectral channels.
5.3.2 Software and Set of Input Parameters
1. Computer programs “V_AERDAT.exe”, “V_TRANSM.exe” and “RAD_IR.
exe” (or “RADNIMB.exe”).
2. Tables of results of the complex temperature-wind aerological sounding whose
data are used with the program “V_AERDAT.exe” at the first step for creating
the input file for further calculation. It is possible to use the ready input files at
the address “\dz-2006\student\”. The ready file containing values of the transmission function for the radiometer at the platform « Nimbus » might be used
also with the computer program “RADNIMB.exe” and file “aer.dat”.
5.3.3 Test Questions
1. What factors influence the difference in the outgoing intensity values at different
wave numbers n?
2. What does the extent to which the outgoing intensity is affected by the surface
emissivity depends on?
5. At which wave number n used in the calculations is the cloud impact on the
outgoing intensity maximum?
4. At which wave numbers n used in the calculations is the cloud impact on
the outgoing intensity maximum?
5. Why is the brightness temperature of the outgoing radiation formed by the
system atmosphere-surface not equal to the sum of surface and atmosphere
brightness temperatures?
6. In a case, where the isothermal atmosphere temperature is equal to the surface
temperature T(x) ¼ const ¼ T(p S ) and the surface emissivity e(n) is equal to a
unit. What is the brightness temperature of the outgoing radiation equal to?
50
5 Calculation of the Intensity of Self Heat Radiation of the System