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Iain Woodhouse
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Section in the University of Edinburgh course: Remote Sensing of Global Change

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Iain Woodhouse
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Remote Sensing of Global Change (atmosphere)

Questão 1 de 7 Questão 1 de 7

1

The word occultation comes from what what root?

Selecione uma das seguintes:

  • 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.

Explicação

Questão 2 de 7 Questão 2 de 7

1

Limb sounding is the name given to what kind of measurement of the atmosphere?

Selecione uma das seguintes:

  • Nadir viewing measurements of emitted radiation.

  • Limb viewing measurements of absorbed radiation.

  • Nadir viewing measurements of absorbed radiation.

  • Limb viewing measurements of emitted radiation.

Explicação

Questão 3 de 7 Questão 3 de 7

1

There are three viewing configurations typically used for atmospheric remote sensing - what are they (click the three you think are correct):

Selecione uma ou mais das seguintes:

  • Limb sounding (detecting transmitted radiation through the atmospheric limb)

  • Limb sounding (detecting emitted radiation from the atmospheric limb)

  • Nadir sounding (detecting transmitted radiation from directly below the satellite)

  • Occultation (detecting transmitted radiation through the atmospheric limb)

  • Nadir sounding (detecting emitted radiation from directly below the satellite)

Explicação

Questão 4 de 7 Questão 4 de 7

1

Absorption lines of a particular gas are centred on discrete wavelengths because...

Selecione uma das seguintes:

  • ... 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.

  • ... quantum physics determines that all the molecular energy transitions will occur in discrete jumps (quanta).

Explicação

Questão 5 de 7 Questão 5 de 7

1

In terms of the monitoring capacity of different atmospheric sounders, nadir sounders have horizontal resolution but vertical resolution compared to limb sounders.

Arraste e solte para completar o texto.

    better
    poorer

Explicação

Questão 6 de 7 Questão 6 de 7

1

The key advantages of limb sounding over nadir sounding for measuring very small gas concentrations are (choose all the ones you think are true):

Selecione uma ou mais das seguintes:

  • The signal is not sensitive to the atmosphere below the tangent layer.

  • The path length over which the measurement is made is very long.

  • The background is the Earth's surface and so very bright.

  • The background signal is darks space (i.e. a very low and consistent signal).

  • We can use the Sun as a source of radiation.

Explicação

Questão 7 de 7 Questão 7 de 7

1

Add the appropriate labels.

1
2
3
4
5

Arraste a resposta correta para cada ponto laranja.

    High energy is good for occultation
    Low energy is good for sounding
    6,000 K
    2,000 K
    300 K

Explicação