Photolysis of NO2: a) NO2 readily photolyzes in the troposphere, producing 0 + NO. Using the values for spectral actinic flux, absoiption cross section, and quantum yield from the table below (for the surface at noon, July 1, 40 N, 298 K), calculate the photolysis rate constant of NO2 (jN02,1, units sl) in each of the wavelength bins, the total NO2 photolysis rate constant (jNo2, units s-), and the corresponding lifetime against photolysis. Wavelength Spectral actinic flux Absorption cross- Quantum range (nm) (photons cm2 sl nm1) section (cm2) yield 305-320 5.42 x 1013 2.00 x 10-19 0.994 320-335 1.35 x 1014 2.97 x 10-19 0.991 335-350 1.62 x 1014 3.90 x 10-19 350-365 1.84 x 1014 4.75 x 10-19 0.985 365-380 2.30 x 1014 5.40 x 10-19 0.979 380-395 2.08 x 1014 5.80 x 10-19 0.957 395-410 3.22 x 1014 5.89 x 10-19 0.501 b) The photolysis of NO2 is the only chemical source of ozone in the troposphere (because the O it produces quickly combine with O2 to make O3). If NO2 is in steady state at 32 ppb (the highest 1-hour average value reached in Davis in 2020), how much ozone (in ppb) does NO2 photolysis produce in 1 hour? (In reality, that high NO2 measurement was probably not taken at noon; NO2 tends to build up at night and decrease during the day due to rapid photolysis) 0.988