The UV-visible absorption cross-sections of IONO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;

Mössinger, J.; Rowley, D. M.; Cox, R. A.

doi:10.5194/acp-2-227-2002

Cited by 19 publications

(20 citation statements)

References 23 publications

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“…In scenario 2, most of the iodine in the gas phase forms IONO 2 through . As discussed by Kaltsoyannis and Plane [2008], the other known mechanisms for recycling IONO 2 , photolysis to I + NO 3 using either of the literature cross sections [ Joseph et al , 2007; Mössinger et al , 2002], thermal decomposition (to IO + NO 2 ), or uptake into aerosol and emission as IBr and ICl, are not fast enough to compensate for the removal by . IO would then be significantly below the observed concentrations (Figure 3), and I 2 would be below the DOAS detection limit.…”

Section: Discussion and Modellingmentioning

confidence: 99%

Reactive iodine species in a semi‐polluted environment

Mahajan

Oetjen

Saiz‐Lopez

et al. 2009

Geophysical Research Letters

187

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[1] Iodine chemistry in the marine boundary layer has attracted increasing attention over the last few years because iodine oxides cause ozone destruction, change the atmospheric oxidising capacity, and can form ultrafine particles. However, the chemistry of iodine in polluted environments is not well understood: its effects are assumed to be inhibited by reactions involving NO x (NO 2 & NO). This paper describes Differential Optical Absorption Spectroscopy (DOAS) observations of iodine species (I 2 , OIO and IO) and the nitrate radical (NO 3 ) at a semi-polluted coastal site in Roscoff, France. Significant concentrations of IO and I 2 were measured during daytime, indicating efficient recycling of iodine from iodine nitrate (IONO 2 ). I 2 , IO, OIO and NO 3 were observed at night. These observations are interpreted using a one dimensional model to demonstrate that iodine plays an important role even in polluted environments due to recycling mechanisms not considered previously.

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Section: Discussion and Modellingmentioning

confidence: 99%

Reactive iodine species in a semi‐polluted environment

Mahajan

Oetjen

Saiz‐Lopez

et al. 2009

Geophysical Research Letters

187

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“…7, For the yield, see Davis et al [1996]. 8, The recently measured IONO 2 cross section from Mössinger et al [2002] is used. 9, Absorption cross section according to Rowley et al [1999].…”

Section: Inferring Total Gaseous Stratospheric Iodinementioning

confidence: 99%

“…At stratospheric temperatures, the rate coefficient for reaction (R10) is uncertain by a factor of 2, i.e., for p = 100 mbar, and T = 220 K, the error limits given by DeMore et al [1997] suggest a rate coefficient in the range of 2.3 to 8.5 Â 10 À12 cm 3 /s with a recommended value of 4.6 Â 10 À12 cm 3 /s. Here the recently measured IONO 2 spectrum from Mössinger et al [2002] is taken, and the combined uncertainties of the cross section and actinic flux is taken into account by tuning its photolysis rate by ±50% in the model. Evidently, the combined uncertainties of the formation reaction (R10) and photolysis determine the IONO 2 /IO ratio with the lower photolysis rate and the upper limit of reaction (R10) determining the inferred I y upper limits.…”

Section: Inferring Total Gaseous Stratospheric Iodinementioning

confidence: 99%

Upper limits of stratospheric IO and OIO inferred from center‐to‐limb‐darkening‐corrected balloon‐borne solar occultation visible spectra: Implications for total gaseous iodine and stratospheric ozone

Bösch

2003

J. Geophys. Res.

118

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[1] We report upper limits of lower stratospheric IO (inferred lowest values: 0.10 ppt, 0.07 ppt, and 0.06 ppt at 20, 15, and 12.5 km, respectively) and OIO (inferred lowest values: 0.10 ppt, 0.06 ppt, and 0.04 ppt at 20, 15, and 12.5 km, respectively) inferred from balloon-borne solar occultation UV/visible spectroscopy. The spectra were recorded during a series of Laboratoire de Physique Moléculaire et Applications/ differential optical absorption spectroscopy (LPMA/DOAS) balloon flights that were conducted at different geophysical conditions, i.e., inside the Arctic winter vortex, at midlatitudes, and at high latitudes in spring, summer, and fall. Photochemical modeling that accounts for the iodine partitioning during the observations allows us to infer upper limits of total inorganic gas-phase iodine (I y ), i.e., I y (<20 km) of 0.10 ± 0.02 ppt and 0.07 ± 0.01 ppt, taking into account and neglecting OIO photolysis, respectively. For the middle stratosphere, the inferred upper limits of total I y are larger because of the smaller detection sensitivity there. These observations suggest that either much less iodine enters the stratosphere than the amount expected from the stratospheric entry level iodine concentrations (primarily the tropical upper troposphere) or it resides in other minor gaseous species or, eventually, in a nongaseous, i.e., particulate, form in the stratosphere. The implications of our iodine measurements for stratospheric ozone are also briefly assessed using a two-dimensional model. For the assumed loading of 0.1 ppt I y the modeled ozone reduction was small compared to a model run without iodine, with a maximum decrease of around 1% in midlatitudes to high latitudes when OIO photolysis is included. (3334); KEYWORDS: solar occultation spectroscopy, iodine chemistry, stratospheric ozone, center-to-limb-darkening correction, differential optical absorption spectroscopy Citation: Bösch, H., C. Camy-Peyret, M. P. Chipperfield, R. Fitzenberger, H. Harder, U. Platt, and K. Pfeilsticker, Upper limits of stratospheric IO and OIO inferred from center-to-limb-darkening-corrected balloon-borne solar occultation visible spectra: Implications for total gaseous iodine and stratospheric ozone,

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“…The uptake is followed by hydrolysis to HNO 3 and HOI (aq) that is then available for iodine release as described in RM2, RM3 and RM5. At Mace Head, a lifetime of INO 3 with respect to heterogeneous uptake on sea salt aerosols was found to be 10 hours [ Mössinger et al , 2002].…”

Section: Discussionmentioning

confidence: 99%

Iodine oxide in the Dead Sea Valley: Evidence for inorganic sources of boundary layer IO

Zingler

Platt

2005

J. Geophys. Res.

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1] The importance of iodine oxide (IO) in tropospheric boundary layer chemistry has been well established in the last decade. Iodine-containing radicals have been detected in regions of high biological productivity. To date, most explanations assume biogenic precursors (e.g., emission of iodocarbons). In a 2 week field campaign at the Dead Sea, Israel, IO was found to exceed the detection limit (0.3-2 parts per trillion (ppt)) almost daily, with peak levels topping 10 ppt. Macro algae are nonexistent because of the water's high salinity. The Dead Sea's microbiology is discussed in detail, and organic sources of iodine oxide are found to be of minor importance. Thus the site can be treated as a unique place for the investigation of inorganic sources of IO. Such processes have recently been included in model studies. Our study focuses on the first direct evidence for inorganic sources of reactive boundary layer iodine. Heterogeneous iodine release induced by photolysis, liquid phase ozone reactions, or catalytic HOX interactions are discussed as well as NO x chemistry.Citation: Zingler, J., and U. Platt (2005), Iodine oxide in the Dead Sea Valley: Evidence for inorganic sources of boundary layer IO,

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The UV-visible absorption cross-sections of IONO<sub>2</sub>

Cited by 19 publications

References 23 publications

Reactive iodine species in a semi‐polluted environment

Reactive iodine species in a semi‐polluted environment

Upper limits of stratospheric IO and OIO inferred from center‐to‐limb‐darkening‐corrected balloon‐borne solar occultation visible spectra: Implications for total gaseous iodine and stratospheric ozone

Iodine oxide in the Dead Sea Valley: Evidence for inorganic sources of boundary layer IO

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