Type the correct answer into each gap. You may need to use a calculator for some answers.
About this exercise type...
If the satellite measures a tropospheric NO2 column of 5·1016 molec/cm2, to which mixing ratio (in ppb) does this correspond if you assume a well mixed boundary layer of 1 km thickness, a pressure of 1000 mbar and a temperature of 300 K?
Concentration: _ molec/cm2 / _ cm = _ molec/cm3
Density of air: _ = _ molec/m3 = _ molec/cm3
Volume mixing ratio: (_ molec/cm3 NO2) / (_ molec/cm3 air) = _ = _ ppb
TipHINT: Derivation of the density of air: n/V → p/(kT).
Entering mathematical expressionsHow to enter mathematical expressions in exercise gaps
| General | Spaces inside and outside expressions and the case of characters will usually be ignored. |
| Symbols | Use * for multiplication and / for division. Use ° or deg for degrees. Use conventional function abbreviations, e.g. cos, rad etc. |
| Decimals | E.g. 3.15, 0.02. Use only . for a decimal point. The number of decimal places to be entered will normally be stated in the exercise, if not enter the minimum reasonable number of decimal places. |
| Powers | Enter e.g. 3-2 in the form 3^-2. Enter 3·10-2 as 3E-2 or 3*10^-2. |
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