Catalytic destruction of stratospheric ozone

Lary, D. J.

doi:10.1029/97jd00912

Cited by 159 publications

(122 citation statements)

References 14 publications

(4 reference statements)

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“…2, top left) is mainly related to the odd hydrogen rise until about 1 hPa (see also Fig. 3), in agreement with past studies (see Lary, 1997) and observable results (Rohen et al, 2005).…”

Section: The Ozonesupporting

confidence: 80%

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Solar particle effects on minor components of the Polar atmosphere

et al. 2008

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Abstract. Solar activity can influence the Earth's environment, and in particular the ozone layer, by direct modulation of the e.m. radiation or through variability of the incoming cosmic ray flux (solar and galactic particles). In particular, solar energetic particles (SEPs) provide additional external energy to the terrestrial environment; they are able to interact with the minor constituents of the atmospheric layer and produce ionizations, dissociations, dissociative ionizations and excitations. This paper highlights the SEP effects on the chemistry of the upper atmosphere by analysing some SEP events recorded during 2005 in the descending phase of the current solar cycle. It is shown that these events can lead to short-(hours) and medium-(days) term ozone variations through catalytic cycles (e.g. HO x and NO x increases). We focus attention on the relationship between ozone and OH data (retrieved from MLS EOS AURA) for four SEP events: 17 and 20 January, 15 May and 8 September. We confirm that SEP effects are different on the night and day hemispheres at high latitudes.

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“…2, top left) is mainly related to the odd hydrogen rise until about 1 hPa (see also Fig. 3), in agreement with past studies (see Lary, 1997) and observable results (Rohen et al, 2005).…”

Section: The Ozonesupporting

confidence: 80%

“…At lower altitudes (stratosphere) theory suggests long lasting ozone depletion connected to the odd nitrogen species rise (see Lary, 1997;Jackman et al, 2005). A decrease in the stratospheric ozone is present in the MLS January 2005 data but it seems to start before the 17 January SEP event (see also Fig.…”

Section: The Ozonementioning

confidence: 99%

Solar particle effects on minor components of the Polar atmosphere

et al. 2008

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“…The results obtained for BrO 2 The RCCSD͑T͒/cc-pVQZ//QCISD/6-311(2d) AIE is identical to the CCSD͑T͒/6-311ϩG(3d f )//CCSD͑T͒/6-311(2d f ) AIE of Francisco 20 of 10.16 eV, suggesting that this value is close to the computational limit ͑level of correlation and basis set size͒. The RCCSD͑T͒/cc-pVQZ VIE obtained using the experimental geometry of the neutral ground state is 10.24 eV, which agrees very well with the experimental VIE ͑which is equal to the AIE͒ of 10.26 eV.…”

Section: Bro 2 Optimized Geometries Computed Harmonic Vibrational Frmentioning

confidence: 99%

A study of the BrO and BrO2 radicals with vacuum ultraviolet photoelectron spectroscopy

Dyke

Gamblin

Hooper

et al. 2000

The Journal of Chemical Physics

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The BrO radical, prepared by the BrϩO 3 reaction, has been investigated by ultraviolet photoelectron spectroscopy. Two vibrationally resolved bands were observed corresponding to the ionizations BrO ϩ (X 3 ⌺ Ϫ )←BrO(X 2 ⌸) and BrO ϩ (a 1 ⌬)←BrO(X 2 ⌸). These assignments are supported by the results of complete active space self-consistent field/multireference configuration interaction ͑CASSCF/MRCI͒ calculations performed as part of this work. The adiabatic ionization energies of these bands were measured as (10.46Ϯ0.02) and (11.21Ϯ0.02)eV, respectively. Measurement of the vibrational separations in these bands led to estimates of the vibrational constants in the ionic states of (840Ϯ30) cm Ϫ1 and (880Ϯ30) cm Ϫ1 , and Franck-Condon simulations of the vibrational envelopes gave values of the ionic state bond lengths of (1.635Ϯ0.005) and (1.641Ϯ0.005) Å for the X 3 ⌺ Ϫ and a 1 ⌬ states of BrO ϩ , respectively. The OϩBr 2 reaction was found to give a band at (10.26Ϯ0.02) eV associated with a reaction product. Comparison of the results obtained for the BrϩO 3 reaction showed that it could not be assigned to ionization of BrO. Calculations of the first adiabatic ionization energies and Franck-Condon simulations of the vibrational envelopes of the first photoelectron bands of BrO 2 and Br 2 O and their isomers demonstrated that this band corresponds to the first ionization of OBrO, the BrO 2 ϩ (X 1 A 1 )←BrO 2 (X 2 B 1 ) ionization. FranckCondon simulations were performed with the experimental geometry of BrO 2 (X 2 B 1 ) but with different cationic state geometries. The simulated envelope which most closely matched the experimental envelope gave geometrical parameters of r e ϭ1.6135 Å and ЄOBrOϭ117.5°for the ionic state.

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“…Beside the most important catalytic cycles of the bromine and hydrogen radicals for the polar ozone loss [Lary, 1997] [1990] at the upper limit and by the data of Huder and DeMote [1995] at the lower limit. The latter are significantly lower (up to a factor of 2) than the recommended cross section values of DeMote et al [1997].…”

Section: Introductionmentioning

confidence: 99%