The word occultation comes from what what root?
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.
\[ \it{Limb}\] \[ \it{sounding} \] is the name given to what kind of measurement of the atmosphere?
Nadir viewing measurements of emitted radiation.
Limb viewing measurements of emitted radiation.
Nadir viewing measurements of absorbed radiation.
Limb viewing measurements of absorbed radiation.
There are three viewing configurations typically used for atmospheric remote sensing - what are they (click the three you think are correct):
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)
Absorption lines of a particular gas are centred on discrete wavelengths because...
... 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.
In terms of the monitoring capacity of different atmospheric sounders, nadir sounders have ❌ horizontal resolution but ❌ vertical resolution compared to limb sounders.
The key advantages of limb sounding over nadir sounding for measuring very small gas concentrations are (choose all the ones you think are true):
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.
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