Interactive Photochemistry in Earth System Models to Assess Uncertainty in Ozone and Greenhouse Gases. Final report

Prather, Michael J.¹  Hsu, Juno¹  Nicolau, Alex¹  Veidenbaum, Alex² 

[1] Univ. of California, Irvine, CA (United States);Univ. of California, Irvine, CA (United

关键词: atmospheric radiation-chemistry-dynamics interaction;    stratospheric ozone;    linearized ozone scheme;    tropopause;    Fast-J;    GPUs;    uncertainty quantification;   

DOI  :  10.2172/1163479
RP-ID  :  DOE-UCI--0007021
PID  :  OSTI ID: 1163479

美国|英语

来源: SciTech Connect

【 摘 要 】

Atmospheric chemistry controls the abundances and hence climate forcing of important greenhouse gases including N₂O, CH₄, HFCs, CFCs, and O₃. Attributing climate change to human activities requires, at a minimum, accurate models of the chemistry and circulation of the atmosphere that relate emissions to abundances. This DOE-funded research provided realistic, yet computationally optimized and affordable, photochemical modules to the Community Earth System Model (CESM) that augment the CESM capability to explore the uncertainty in future stratospheric-tropospheric ozone, stratospheric circulation, and thus the lifetimes of chemically controlled greenhouse gases from climate simulations. To this end, we have successfully implemented Fast-J (radiation algorithm determining key chemical photolysis rates) and Linoz v3.0 (linearized photochemistry for interactive O₃, N₂O, NO_y and CH₄) packages in LLNL-CESM and for the first time demonstrated how change in O2 photolysis rate within its uncertainty range can significantly impact on the stratospheric climate and ozone abundances. From the UCI side, this proposal also helped LLNL develop a CAM-Superfast Chemistry model that was implemented for the IPCC AR5 and contributed chemical-climate simulations to CMIP5.