Sensitivity studies of the recent new data on O(1D) quantum yields in O3 Hartley band photolysis in the stratosphere N. Taniguchi1, S. Hayashida1, K. Takahashi2, and Y. Matsumi2 1Faculty of Science, Nara Women’s University, Kitauoya - Nishimachi, Nara, 630 - 8506, Japan 2Solar - Terrestrial Environment Laboratory, Nagoya University, Honohara 3 - 13, Toyokawa, 442 - 8507, Japan
Abstract. The production yields of excited oxygen
O(1D) atoms from the near ultraviolet O3 photolysis
are essential quantities for atmospheric chemistry calculations because of its importance as
major sources of hydroxyl (OH) radicals and nitric oxide (NO). Recently, new
O(1D) quantum yields from O3 photolysis between 230 and
305 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 and
300 nm). In order to assess consequences of the new data of O(1D) quantum yields on the stratospheric chemistry, the
changes in stratospheric chemical partitioning and O3 concentration are examined using a
one-dimensional atmospheric model. Our steady state model simulations for
40° N in March indicate that the smaller O(1D) quantum yields result in increases of stratospheric
O3 (up to ~2% in the upper stratosphere), which are attributed to the changes in
HOx, NOx, and ClOx abundance and their catalyzed
O3 loss rates.
Citation: Taniguchi, N., Hayashida, S., Takahashi, K., and Matsumi, Y.: Sensitivity studies of the recent new data on O(1D) quantum yields in O3 Hartley band photolysis in the stratosphere, Atmos. Chem. Phys., 3, 1293-1300, doi:10.5194/acp-3-1293-2003, 2003.