Absolute ozone absorption cross section in the Huggins Chappuis minimum (350–470 nm) at 296 K

Abstract

Abstract. We report the ozone absolute absorption cross section between 350-470 nm, the minimum between the Huggins and Chappuis bands, where the ozone cross section is less than 10 −22 cm 2 . Ozone spectra were acquired using an incoherent broadband cavity enhanced absorption spectrometer, with three channels centered at 365, 405, and 455 nm. The accuracy of the measured cross section is 4-30 %, with the greatest uncertainty near the minimum absorption at 375-390 nm. Previous measurements vary by more than an order of magnitude in this spectral region. The measurements reported here provide much greater spectral coverage than the most recent measurements. The effect of O 3 concentration and water vapor partial pressure were investigated, however there were no observable changes in the absorption spectrum most likely due to the low optical density of the complex.

High spectral resolution ozone absorption cross-sections – Part 1: Measurements, data analysis and comparison with previous measurements around 293 K

“…For comparison purposes, in this work we used the same limits. In the Wulf band, we calculated integrated absorption cross-sections for our new data and Bogumil et al (2003) data using the range 663-1000 nm (Banichevich et al, 1993). Table 3 presents the integrated absorption cross-sections obtained from this work, the high spectral resolution BMD dataset, the different satellite instrument datasets and the mean values obtained by Orphal from averaging several data sources Brion et al, 1998;Voigt et al, 2001;Bogumil et al, 2003;Burrows et al, 1999a).…”

“…Orphal (2003) proposed integration limits which were found from pragmatic considerations such as the quality of the considered datasets rather than the real band borders, determined by theoretical studies (Grebenshchikov et al, 2007;Banichevich et al, 1993). For comparison purposes, in this work we used the same limits.…”

“…The O 3 absorption spectrum in the region 200-1100 nm consists of four absorption bands (Hartley, Huggins, Chappuis, and Wulf). Quantum mechanical dynamics calculations on potential energy surfaces explain the principal features of the O 3 spectrum in the UV, visible and near infrafed (NIR) wavelength regions (Banichevich et al, 1993;Grebenshchikov et al, 2007;Schinke and McBane, 2010). The assignment of absorption bands from nine electronic states was very comprehensibly illustrated using one-dimensional cuts through the potential energy surfaces (Grebenshchikov et al, 2007).…”

Gas-phase broadband spectroscopy using active sources: progress, status, and applications [Invited]

“…LED-based systems have been used in the UV to measure aerosol extinction [22] and O 3 [213]. They have been used in the blue to measure O 4 , NO 2 , IO, glyoxal, methylglyoxal, H 2 O [171, 214–217] and in the green spectral region to measure NO 3 , NO 2 , and I 2 [218].…”

A novel approach to calibrating a photoacoustic absorption spectrometer using polydisperse absorbing aerosol

“…Black carbon (BC) aerosols, which absorb at all visible wavelengths (Bond et al, 2013), are emitted into the atmosphere as a byproduct of incomplete combustion of biomass and fossil fuels (Bond and Bergstrom, 2006;Jacobson, 2004Jacobson, , 2010. Brown carbon refers to organic aerosol that absorbs much more strongly in the high-energy (blue) portion of the visible spectrum than the low-energy (red) portion (Bahadur et al, 2012;Barnard et al, 2008;Kirchstetter and Thatcher, 2012;McMeeking et al, 2014). Bond et al (2013) estimated the global top of the atmosphere radiative forcing of BC to be 1.1 [0.17-2.1] W m −2 , compared to the radiative forcing from CO 2 of +1.68 [1.5-1.86] W m −2 and CH 4 at +0.97 [0.80-1.14] W m −2 [2013].…”