A kinetic model for ozone uptake by solutions and aqueous particles containing I⁻and Br⁻, including seawater and sea-salt aerosol

Abstract

The heterogeneous interactions of gaseous ozone (O3) with seawater and with sea-salt aerosols are known to generate volatile halogen species, which, in turn, lead to further destruction of O3. Cl− acts as a catalyst in the surface reactions X− + O3.

Estimation of reactive inorganic iodine fluxes in the Indian and Southern Ocean marine boundary layer

“…It should be noted that a recent study suggested that the activation energies from MacDonald et al (2014) are better summarised as approximately zero (e.g. Moreno and Baeza-Romero, 2019) as the overall temperature dependence remains unresolved.…”

Actinic Wavelength Action Spectroscopy of the IO− Reaction Intermediate

“…In the atmosphere, iodide (I -) and its oxides, hypoiodite (IO -) and iodite (IO2 -) are relevant due to their reactivity towards ozone while iodate (IO3 -) anions, alongside its conjugate acid (HNO3) , have been implicated in particle formation [1][2][3][4] . Both Iand IOx -(x =1, 2, 3) are detected in ground-based atmospheric gas measurements where IO3concentrations exhibit a diurnal response, with lowest values detected during daytime, suggesting a link to photochemistry and night-time halogen chemistry 5 .…”

“…K 9 j q I p a z y z h n 7 A e v s E c H 2 a n Q = = < / l a t e x i t > (IO )3 ⌃ < l a t e x i t s h a 1 _ b a s e 6 4 = " g i 03 L e D W x z 6 G y V D J U b T f L n a S P v E = " > A A A C B X i c d V D L T g I x F O 3 4 R H y h L n X R C C a 6 k H R A Q H Z G N 7 o S E 1 E T Q N I p H W j o P N L e M Z L J b N z 4 K 2 5 c a I x b / 8 G d f 2 N R T N T o S W 7 u y T n 3 p r 3 H C a X Q Q M i b N T Y + M T k 1 n Z p J z8 7 N L y x m l p b P d B A p x u s s k I G 6 c K j m U v i 8 D g I k v w g V p 5 4 j + b n T P x j 6 5 1 d c a R H 4 p z A I e c u j X V + 4 g l E w U j u z 1 g R + D c q L N 4 + O c 5 f x d p L b M s 1 O m j W R S 9 q Z L M m T c q l a J J j k S 8 S u V K u G E F L e L R a w b c g Q W T R C r Z 1 5 b X Y C F n n c B y a p 1 g 2 b h N C K q Q L B J E / S z U j z k L I + 7 f K G o T 7 1 u G 7 F H 1 c k e M M o H e w G y p Q P + E P 9 v h F T T + u B 5 5 h J j 0 J P / / a G 4 l 9 e I w J 3 t x U L P 4 y A + + z z I T e S G A I 8 j A R 3 h O I M 5 M A Q y p Q w f 8 W s R x V l Y I J L m x C + L s X / k 7 N C 3 i 7 n y c l O d m 9 / F E c K r a J 1 t I l s V E F 7 6 B D V U B 0 x d I P u 0 A N 6 t G 6 t e + v J e v 4 c H b N G O y v o B 6 y X d w I h l 6 E = < / l a t e x i t >…”

Review of "Estimation of Reactive Inorganic Iodine Fluxes in the Indian Ocean and Southern Ocean Marine Boundary Layer"

“…MacDonald et al noted that the Arrhenius pre-exponential factor in Magi et al is ten orders of magnitude greater than the diffusion limit to justify assuming an activation energy for the first step of zero. More recent work has also called the rates determined in Magi et al into question (Moreno et al, 2018), however, the confounding factors (high iodide concentrations and iodide surface activity) cannot fundamentally dispel the observed positive temperature dependence. Notably, the values reported in MacDonald are predicated on an assumption that the activation energy of I-+ O3 is zero and it is even more uncertain whether the overall activation energy to produce I2 is negative.…”

“…The activation energies from MacDonald are better summarized as approximately zero (e.g. Moreno and Baeza-Romero 2019) as the overall temperature dependence remains unresolved. Line 401-405: While diurnal variation in O3 can be inferred, its reversal is not apparent in Fig.…”