期刊
TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY
卷 74, 期 1, 页码 1-23出版社
STOCKHOLM UNIV PRESS
DOI: 10.16993/tellusb.33
关键词
aerosol thermodynamics; metastable state; nitrate; ammonium; organic water
资金
- project FORCeS from the European Union's Horizon 2020 research and innovation programme [821205]
- project PyroTRACH (ERC-2016-COG) from H2020-EU.1.1. -Excellent Science-European Research Council (ERC) [726165]
- H2020 Societal Challenges Programme [821205] Funding Source: H2020 Societal Challenges Programme
This study presents and evaluates ISORROPIA-lite, an accelerated and simplified version of the widely used ISORROPIA-II aerosol thermodynamics model. ISORROPIA-lite provides virtually identical results with ISORROPIA-II but reduces computational cost by 35%.
Aerosol simulations especially for Earth System Models require a thermodynamics module with a good compromise between rigor and computational efficiency. We present and evaluate ISORROPIA-lite, an accelerated and simplified version of the widely used ISORROPIA-II v.2.3 aerosol thermodynamics model, expanded to include the effects of water uptake from organics and an updated interface communicating simulation diagnostics and information. ISORROPIA-lite assumes the aerosol is in metastable equilibrium (i.e., salts do not precipitate from supersaturated solutions) and treats the thermodynamics of Na+-NH4+-SO42--NO3--Cl--Ca2+-K+-Mg2+-Organics-H2O aerosol using binary activity coefficients from precalculated look-up tables. Offline comparison between ISORROPIA-II and ISORROPIA-lite (without organic water effects) for more than 330,000 atmospherically-relevant states demonstrated that i) ISORROPIA-lite provides virtually identical results with ISORROPIA-II in metastable mode and ii) differences between stable mode ISORROPIA-II and ISORROPIA-lite are less than 25% for the concentrations of the various semivolatile aerosol components and similar to the differences between stable and metastable modes of ISORROPIA-II. Using ISORROPIA-lite reduced computational cost by 35% compared to ISORROPIAII simulations in stable mode with online calculation of binary activity coefficients. Application of ISORROPIA-lite in the PMCAMx chemical transport model accelerated the 3D simulations by about 10% compared to using ISORROPIA-II in stable mode with changes in the concentrations of the major aerosol components of less than 10%. Simulations considering the effects of the organic aerosol water did not slow down ISORROPIA-lite but increased the concentrations of the inorganic semivolatile components especially at nighttime. Organic water could highly contribute to the total PM 1 water mass and increase the concentrations of fine nitrate and ammonium by as much as 1 mu g m(-3) in places where the organic aerosol and RH levels are high.
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