Observed seasonal changes in Martian hydrogen chloride explained by heterogeneous chemistry

Open Access

Table D.2

Heterogeneous reactions involving chemistry species studied in the ID photochemistry model.

Key	Heterogeneous Reaction	Uptake Coefficient (γ)	Citations
h_Cl1	$\begin{array}{l} 6 H_{2} O + h v + {Dust}_{Mg {({ClO}_{4})}_{2}} \\ \to Cl + 4 O + {Dust}_{Mg ({ClO}_{4}) \cdot 6 H_{2} O} \end{array}$ $\eqalign{ & 6{{\rm{H}}_2}{\rm{O}} + {\rm{h}}v + {\rm{Dus}}{{\rm{t}}_{{\rm{Mg}}{{\left( {{\rm{Cl}}{{\rm{O}}_4}} \right)}_2}}} \cr & {\rm{Cl}} + 4{\rm{O}} + {\rm{Dus}}{{\rm{t}}_{{\rm{Mg}}\left( {{\rm{Cl}}{{\rm{O}}_4}} \right) \cdot 6{{\rm{H}}_2}{\rm{O}}}} \cr}$	6.20×10⁻² × MIN(RH,1.0) × j_ClO	This study, motivated by Zhang et al. (2021)
			Huynh & McNeill (2021) and Huynh & McNeill (2020)
h_Cl2	$HCl + {Dust}_{{CaCO}_{3}} \to Products$ ${\rm{HCl}} + {\rm{ Dust}}{{\rm{ }}_{{\rm{CaC}}{{\rm{O}}_3}}}{\rm{ Products }}$	MPM^a(0.02, 2.03E3, 12.30E3)	fit to the MPM
			((Berland et al. 1997))
h_Cl3	HCl + Ice → Products	MPM(0.09, 8.33E8, 30.50E3) × (1 − θ_Lang)	Hynes et al. (2001)
h_Cl4	Cl₂ + Dust_NaCl → Products	lE-5	Burkholder et al. (2019) upper limits
h_Cl5	CIO + Ice → Products	lE-4	Burkholder et al. (2019) upper limits

^a MPM denotes the MPM function, where $MPM (A, A_{Des} / A_{R}, Δ E) = A \times {(1 + \frac{A_{D e s}}{A_{R}} \times \exp (- ΔE / RT))}^{- 1}$ ${\mathop{\rm MPM}\nolimits} \left( {{\rm{A}},{{\rm{A}}_{{\rm{Des }}}}/{{\rm{A}}_R},\Delta E} \right) = {\rm{A}} \times {\left( {1 + {{{A_{Des}}} \over {{A_R}}} \times \exp ( - \Delta {\rm{E}}/{\rm{RT}})} \right)^{ - 1}}$ . A_Des (s⁻¹) denotes the pre-exponential factor of the adsorbed molecule; A_R (s⁻¹) denotes the pre-exponential factor of the adsorbed molecules ionisation; Δ E (J mol⁻¹) denotes the difference in activation energies of the Arrhenius equations controlling the absorption of molecule onto the solid and the ionisation of the adsorbed molecule at the solid surface; R (J mol⁻¹ K⁻¹) is the universal gas constant; T is the atmospheric temperature.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.