Sensitivity studies of the recent new data on O(1D) quantum yields in O3 Hartley band photolysis in the stratosphere

[摘要] The production yields of excited oxygenO(¹D) atoms from the near ultraviolet O₃ photolysisare essential quantities for atmospheric chemistry calculations because of its importance asmajor sources of hydroxyl (OH) radicals and nitric oxide (NO).Recently, newO(¹D) quantum yields from O₃ photolysis between 230 and305 nm in the Hartley band region were reported, which are almost independent of the photolysis wavelength(0.88-0.93) and smaller than NASA/JPL-2000 recommendations (0.95 between 240 and300 nm).In order to assess consequences of the new data of O(¹D) quantum yields on the stratospheric chemistry, thechanges in stratospheric chemical partitioning and O₃ concentration are examined using aone-dimensional atmospheric model.Our steady state model simulations for40° N in March indicate that the smaller O(¹D) quantum yields result in increases of stratosphericO₃ (up to ~2% in the upper stratosphere), which are attributed to the changes inHO_x, NO_x, and ClO_x abundance and their catalyzedO₃ loss rates.

[学科分类] 大气科学