Figure 1 shows a spectrum of top-of-atmosphere emitted infrared radiation measur

Question

Figure 1 shows a spectrum of top-of-atmosphere emitted infrared radiation measured by AIRS (in red) with the central wavenumbers of some of the MODIS bands marked as green boxes. Gaps in the AIRS spectrum are instrumental and should be ignored. The wavenumber unit is cm 1. a) Identify the MODIS bands labeled as I. II, and III as band number and central wavelength. b) Describe the characteristics of the spectrum labeled A, B, C, D (e.g, a feature caused by water vapor), and discuss how these can or could be used in the remote sensing of geophysical variables c) Discuss the geophysical conditions under which the spectrum was taken. d) If the spectrum was taken in cloud-free conditions, sketch a comparable spectrum for cloudy conditions, or if the spectrum was taken in cloudy conditions, sketch a comparable spectrum for cloud-free conditions. (410 points 40 points) 300 250 200 600 800 1000 120014001600 1800 2000 2200 2400 2600 wavenumber

Explanation / Answer

a) I. ~850 cm-1=11764nm= band 32 with central wavelength 12020

II. ~900cm-1=11111nm= band 31 with central wavelength 11030

III.~2500 cm-1=4000nm=11764nm= band 22 with central wavelength 3959

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