4715261
Description
Quiz by Iain Woodhouse, updated more than 1 year ago
|
Created by Iain Woodhouse
over 8 years ago
|
|
Question 1
Question
The word occultation comes from what what root?
Answer
-
From the Latin "Occultatio", meaning hiding, or concealing.
-
From the Greek "Occultos", meaning to look through.
-
From the Latin "Occultatio", meaning atmosphere, or gas.
-
From Old French "Occultation", meaning to gaze upon something.
Question 2
Question
\[ \it{Limb}\] \[ \it{sounding} \] is the name given to what kind of measurement of the atmosphere?
Answer
-
Nadir viewing measurements of emitted radiation.
-
Limb viewing measurements of emitted radiation.
-
Nadir viewing measurements of absorbed radiation.
-
Limb viewing measurements of absorbed radiation.
Question 3
Question
There are three viewing configurations typically used for atmospheric remote sensing - what are they (click the three you think are correct):
Answer
-
Nadir sounding (detecting emitted radiation from directly below the satellite)
-
Limb sounding (detecting emitted radiation from the atmospheric limb)
-
Occultation (detecting transmitted radiation through the atmospheric limb)
-
Nadir sounding (detecting transmitted radiation from directly below the satellite)
-
Limb sounding (detecting transmitted radiation through the atmospheric limb)
Question 4
Question
Absorption lines of a particular gas are centred on discrete wavelengths because...
Answer
-
... quantum physics determines that all the molecular energy transitions will occur in discrete jumps (quanta).
-
... the energy levels are in regular, equal intervals.
-
... Heisenberg's Uncertainty Principle dictates that the absorption must be at specific wavelengths.
-
... the Doppler effect determines the specific frequencies (wavelengths) of the lines.
Question 5
Question
In terms of the monitoring capacity of different atmospheric sounders, nadir sounders have [blank_start]better[blank_end] horizontal resolution but [blank_start]poorer[blank_end] vertical resolution compared to limb sounders.
Answer
-
better
-
poorer
Question 6
Question
The key advantages of limb sounding over nadir sounding for measuring very small gas concentrations are (choose all the ones you think are true):
Answer
-
The background signal is darks space (i.e. a very low and consistent signal).
-
The background is the Earth's surface and so very bright.
-
The path length over which the measurement is made is very long.
-
The signal is not sensitive to the atmosphere below the tangent layer.
-
We can use the Sun as a source of radiation.
Question 7
Answer
-
6,000 K
-
2,000 K
-
300 K
-
High energy is good for occultation
-
Low energy is good for sounding
Want to create your own Quizzes for free with GoConqr? Learn more.