Photolysis Rate Coefficients in the Upper Atmosphere: Effect of Line by Line Calculations of the O2 Absorption Cross Section in the Schumann - Runge Bands

RAFAEL PEDRO FERNÁNDEZ; GUSTAVO GERARDO PALANCAR; SASHA MADRONICH; BEATRIZ MARGARITA TOSELLI

Elsevier

Año: 2007 vol. 104 p. 1 - 1

font size="1" face="AdvTimes"> A line by line (LBL) method to calculate a highly resolved O2 absorption cross section in the Schumann-Runge (SR) bands region was developed and incorporated in the widely used Tropospheric Ultraviolet Visible (TUV) model to calculate accurate photolysis rate coefficients (J values) in the upper atmosphere. In order to obtain the O2 cross section between 49000 cm-1 and 57000 cm‑1, an algorithm which considers the position, strength, and half width of each spectral line was used. Every transition was calculated by using the HIgh-resolution TRANsmission molecular absorption database (HITRAN) and a Voigt profile. The temperature dependence of both the strength and the half widths was considered within the range