Quiz
Remote Sensing of Global Change (atmosphere)
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Questions in this quiz (7)
1The word occultation comes from what what root?
- AFrom the Latin "Occultatio", meaning hiding, or concealing.
- BFrom the Greek "Occultos", meaning to look through.
- CFrom the Latin "Occultatio", meaning atmosphere, or gas.
- DFrom Old French "Occultation", meaning to gaze upon something.
2\[ \it{Limb}\] \[ \it{sounding} \] is the name given to what kind of measurement of the atmosphere?
- ANadir viewing measurements of emitted radiation.
- BLimb viewing measurements of emitted radiation.
- CNadir viewing measurements of absorbed radiation.
- DLimb viewing measurements of absorbed radiation.
3There are three viewing configurations typically used for atmospheric remote sensing - what are they (click the three you think are correct):
- ANadir sounding (detecting emitted radiation from directly below the satellite)
- BLimb sounding (detecting emitted radiation from the atmospheric limb)
- COccultation (detecting transmitted radiation through the atmospheric limb)
- DNadir sounding (detecting transmitted radiation from directly below the satellite)
- ELimb sounding (detecting transmitted radiation through the atmospheric limb)
4Absorption lines of a particular gas are centred on discrete wavelengths because...
- A... quantum physics determines that all the molecular energy transitions will occur in discrete jumps (quanta).
- B... the energy levels are in regular, equal intervals.
- C... Heisenberg's Uncertainty Principle dictates that the absorption must be at specific wavelengths.
- D... the Doppler effect determines the specific frequencies (wavelengths) of the lines.
5In 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.
- Abetter
- Bpoorer
6The key advantages of limb sounding over nadir sounding for measuring very small gas concentrations are (choose all the ones you think are true):
- AThe background signal is darks space (i.e. a very low and consistent signal).
- BThe background is the Earth's surface and so very bright.
- CThe path length over which the measurement is made is very long.
- DThe signal is not sensitive to the atmosphere below the tangent layer.
- EWe can use the Sun as a source of radiation.
7Add the appropriate labels.
- A6,000 K
- B2,000 K
- C300 K
- DHigh energy is good for occultation
- ELow energy is good for sounding
Information
- Description
- Section in the University of Edinburgh course: Remote Sensing of Global Change
- Author
- Iain Woodhouse
- Language
- English
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- 217
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