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3 results for “Methane lifetime”
Comparison between ozone column depths and methane lifetimes computed by 1-D and 3-D models at different atmospheric O2 Levels
<p>Recently, Cooke et al. (2022) used a 3-D coupled chemistry-climate model (WACCM6) to calculate ozone column depths at varied atmospheric O<sub>2</sub> levels. They argued that previous 1-D photochemical model studies, e.g., Segura et al. (2003), may have overestimated the ozone column depth at low pO<sub>2</sub>, and hence also overestimated the lifetime of methane. We have compared new simulations from an updated version of the Segura et al. model with those from WACCM6, together with some results from another 1-D and 3-D model. The discrepancy in ozone column depths is likely due to multiple interacting parameters, including lower boundary conditions, vertical and meridional transport rates, and different chemical mechanisms, especially the treatment of O<sub>2</sub> photolysis in the Schumann-Runge (SR) bands (175-205 nm). The discrepancy in tropospheric OH concentrations and methane lifetime between WACCM6 and the 1-D model at low pO<sub>2</sub> is reduced when absorption from CO<sub>2</sub> and H<sub>2</sub>O in this wavelength region is included in WACCM6. Including scattering in the SR bands may further reduce this difference. Resolving these issues can be accomplished by developing an accurate parameterization for O<sub>2</sub> photolysis in the SR bands and then repeating these calculations in the various models. Work is already underway to this end.</p>
1-D Model Files for Martian atmospheric chemistry of HCl: implications for the lifetime of atmospheric methane
<p>File containing 1-D model [netCDF] files used in the JGR: Planets manuscript "Martian atmospheric chemistry of HCl: implications for the lifetime of atmospheric methane".</p> <p><strong>MCD-model.zip</strong></p> <p>Contains data files where the 1-D model is driven using Mars Climate Database v5.3 standard climatological profiles of dust and ice aerosols and H2O. readme.txt provides details of the subdirectory structure.</p> <p><strong>TGO-model.zip</strong></p> <p>Contains data files where the 1-D model is driven using dust and ice aerosol profiles retrieved by the ACS TIRVIM and H2O profiles retrieved by either the NOMAD spectrometer or ACS NIR channel. readme.txt provides details of the directory structure.</p> <p><strong>matching_orbits.txt</strong></p> <p>Spatio-temporal details of the 77 ACS MIR HCl retrievals that we aim to reproduce, including the details of the approximately co-located ACS TIRVIM aerosol and NOMAD/ACS NIR H2O retrievals used to drive the 1-D model.</p>
Comparison between ozone column depths and methane lifetimes computed by 1-D and 3-D models at different atmospheric O2 Levels
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