An Inline Aerosol Model in Navy's Global Environmental Prediction System
Abstract
Five most environmentally impacted aerosol species, mineral dust, sea salt, biomass smoke, anthropogenic and biogenic fine particles (ABF), and gas SO2, are implemented in Navy's Global Environmental Prediction System (NAVGEM) as atmospheric tracers that are solved in five mass continuity equations in parallel to ozone and clouds. The aerosols are transported by NAVGEM large-scale advection, vertical turbulent mixing, and horizontal diffusion. Their life cycles are simulated through surface emissions, particle sedimentation, precipitation removal, and dry deposition, as well as mass changes by parameterized chemical reactions. The inline modeling approach, being different from the offline model of Navy's Atmospheric Aerosol Prediction System (NAAPS), will be able to add new capability in NAVGEM to perform aerosol-radiation interactions in weather and seasonal predictions to include aerosol direct and indirect radiative effects in the atmospheric dynamics. In this study, the inline aerosols are preliminarily compared and verified with NAAPS output and observation for mass distribution and optical depth in an effort to understand the modeling accuracy at current stage and computational cost. Being an important part of inline model development, aerosol mass conservation is thoroughly examined, and extra effort is being made to improve the treatments of positive definiteness and mass conservation of NAVGEM large-scale transport. The improvement of computational efficiency is also addressed in this presentation.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A53J2622L
- Keywords:
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- 3307 Boundary layer processes;
- ATMOSPHERIC PROCESSESDE: 3311 Clouds and aerosols;
- ATMOSPHERIC PROCESSESDE: 3322 Land/atmosphere interactions;
- ATMOSPHERIC PROCESSESDE: 1843 Land/atmosphere interactions;
- HYDROLOGY