Intercomparison Between Surrogate, Explicit, and Full Treatments of VSL Bromine Chemistry Within the CAM‐Chem Chemistry‐Climate Model

Autor: Jean-Francois Lamarque, Beatriz M. Toselli, Simone Tilmes, Ross J. Salawitch, Douglas E. Kinnison, Carlos A. Cuevas, Julie M. Nicely, Pamela Wales, Ana I. López-Noreña, Alfonso Saiz-Lopez, Javier Alejandro Barrera, Rafael P. Fernandez
Přispěvatelé: European Commission, Consejo Superior de Investigaciones Científicas (España), Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina), Agencia Nacional de Promoción Científica y Tecnológica (Argentina), Universidad Tecnológica Nacional (Argentina), National Aeronautics and Space Administration (US), National Science Foundation (US)
Rok vydání: 2021
Předmět:
Global Climate Models
Atmospheric Science
010504 meteorology & atmospheric sciences
chemistry.chemical_element
Atmospheric Composition and Structure
Atmospheric model
Total ozone
Biogeosciences
010502 geochemistry & geophysics
Atmospheric sciences
01 natural sciences
Chemistry climate model
Convective Processes
Troposphere
Paleoceanography
Evolution of the Earth
Research Letter
very‐short lived bromine
Middle Atmosphere: Composition and Chemistry
Global Change
Biosphere/Atmosphere Interactions
CAM‐Chem
Stratosphere
0105 earth and related environmental sciences
Evolution of the Atmosphere
Bromine
Atmosphere
tropospheric oxidation capacity
Chemical treatment
lowermost stratospheric ozone
3. Good health
Aerosol
Tectonophysics
Geophysics
chemistry
CCMI
13. Climate action
Atmospheric Processes
General Earth and Planetary Sciences
Troposphere: Composition and Chemistry
Zdroj: Geophysical Research Letters
Digital.CSIC. Repositorio Institucional del CSIC
instname
ISSN: 1944-8007
0094-8276
Popis: 10 pags., 4 figs.
Many Chemistry-Climate Models (CCMs) include a simplified treatment of brominated very short-lived (VSL) species by assuming CHBr as a surrogate for VSL. However, neglecting a comprehensive treatment of VSL in CCMs may yield an unrealistic representation of the associated impacts. Here, we use the Community Atmospheric Model with Chemistry (CAM-Chem) CCM to quantify the tropospheric and stratospheric changes between various VSL chemical approaches with increasing degrees of complexity (i.e., surrogate, explicit, and full). Our CAM-Chem results highlight the improved accuracy achieved by considering a detailed treatment of VSL photochemistry, including sea-salt aerosol dehalogenation and heterogeneous recycling on ice-crystals. Differences between the full and surrogate schemes maximize in the lowermost stratosphere and midlatitude free troposphere, resulting in a latitudinally dependent reduction of ∼1–7 DU in total ozone column and a ∼5%–15% decrease of the OH/HO ratio. We encourage all CCMs to include a complete chemical treatment of VSL in the troposphere and stratosphere.
This study has been funded by the European Union's Horizon 2020 Re-search and Innovation program (Project ‘ERC-2016-COG 726349 CLIMAHAL’), and supported by the Consejo Superior de Investigaciones Científicas of Spain. Computing resources and support are provided by the Computational and Information System Laboratory (CISL,2017). R. P. Fernandez would like to thank financial support from CONICET, ANPCyT (PICT 2015-0714), UNCuyo (SeCTyP M032/3853) and UTN (PID 4920-194/2018). NCAR is sponsored by NSF under grant number 1852977. R. J. Salawitch appreciates support from the NASA (grant ACMP 80NSSC19K0983). The authors thank two anonymous reviewers for their constructive comments
Databáze: OpenAIRE
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