REMOTE SENSING CHAPTER 7
1 TRANSMITTED SUNLIGHT
1.1 What is the difference between active and passive remote sensing?
1.2 Explain the instrument shown in figure 7.2. Is it a passive or an active instrument?
1.3 What is important to think about when measuring aerosols and ozone regarding clouds and
choice of wavelength? Explain in terms of eq. 7.2.1
1.4 Measuring aerosols: Which wavelengths is used to derive aerosol optical depth from ground
based observations and why? Why is it difficult?
1.5 Measuring ozone:
a. Explain how one can measure total ozone concentration by transmitted sunlight.
b. What is important when you select wavelengths? Why 2 pairs?
c. What is the different terms in eq 7.2.31?
d. The name of the instrument that measures total ozone concentration..?
1.6 Limb Extinction Technique:
a. What kind of information can you get by measuring intensity with the Limb
Extinction Technique?
b. In which heigths do you normally measure?
c.
REMOTE SENSING CHAPTER 7
2 REFLECTED SUNLIGHT
2.1 What is the bidirectional reflection distribution function?
2.2 Satellite remote sensing of ozone:
a.
Describe the basic procedures for the determination of ozone concentration from
satellite observations.
b.
How do you calculate the surface albedo?
2.3 Satellite remote sensing of aerosols:
a.
Why is it difficult?
b.
Over which surface has there been some success..?
2.4 How is the surface albedo determined?
2.5 Bidirectional Reflectance in clouds: explain fig 7.8.
2.6 Explain eq 7.3.13 d) in terms of the
indirect aerosol effect.
2.7 What can you say of the relationship
between the reflectance, the cloud
optical depth and the effective
droplet radius in figure 7.9?
REMOTE SENSING CHAPTER 7
3. REMOTE SENSING USING INFRARED RADIATION
3.1 Explain the different terms in eq. 7.4.9.
a. Why can you use the Planck function for the emitted radiance at the surface?
b. Where is the temperature information included?
c. Where is the density profiles of gases included?
3.2 Determination of surface temperature
a. Why is the atmospheric window region used in determination of the surface
temperature?
b. What is the objective of the split-window technique?
3.3 Determination of temperature profiles
a. What is the main principle behind determine the vertical profile of the temperature
in the atmosphere?
b. Why are the emissions from
CO2 and O2 used? Why not
O3?
c. Explain fig 7.14
d. In approx. which altitudes
are the different numbers 16?
e. Comment on the weighting
functions and transmittance
in fig 7.15