4715261
Description
Quiz by Iain Woodhouse, updated more than 1 year ago
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Created by Iain Woodhouse
about 8 years ago
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Question 1
Question
The word occultation comes from what what root?
Answer
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From the Latin "Occultatio", meaning hiding, or concealing.
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From the Greek "Occultos", meaning to look through.
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From the Latin "Occultatio", meaning atmosphere, or gas.
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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
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Nadir viewing measurements of emitted radiation.
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Limb viewing measurements of emitted radiation.
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Nadir viewing measurements of absorbed radiation.
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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
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Nadir sounding (detecting emitted radiation from directly below the satellite)
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Limb sounding (detecting emitted radiation from the atmospheric limb)
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Occultation (detecting transmitted radiation through the atmospheric limb)
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Nadir sounding (detecting transmitted radiation from directly below the satellite)
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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
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... quantum physics determines that all the molecular energy transitions will occur in discrete jumps (quanta).
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... the energy levels are in regular, equal intervals.
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... Heisenberg's Uncertainty Principle dictates that the absorption must be at specific wavelengths.
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... 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
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better
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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
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The background signal is darks space (i.e. a very low and consistent signal).
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The background is the Earth's surface and so very bright.
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The path length over which the measurement is made is very long.
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The signal is not sensitive to the atmosphere below the tangent layer.
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We can use the Sun as a source of radiation.
Question 7
Answer
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6,000 K
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2,000 K
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300 K
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High energy is good for occultation
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Low energy is good for sounding
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