Description and evaluation of a new four-mode version of the Modal Aerosol Module (MAM4) within version 5.3 of the Community Atmosphere Model

Abstract. Atmospheric carbonaceous aerosols play an important role in the climate system by influencing the Earth's radiation budgets and modifying the cloud properties. Despite the importance, their representations in large-scale atmospheric models are still crude, which can influence model simulated burden, lifetime, physical, chemical and optical properties, and the climate forcing of carbonaceous aerosols. In this study, we improve the current three-mode version of the Modal Aerosol Module (MAM3) in the Community Atmosphere Model version 5 (CAM5) by introducing an additional primary carbon mode to explicitly account for the microphysical ageing of primary carbonaceous aerosols in the atmosphere. Compared…

• NS
  National Science Foundation

  Awards: DE-AC05-76RL01830, 76RL01830
• UD
  U.S. Department of Energy

  Awards: 76RL01830, AC05-76RL01830, DE-AC05-76RL01830, DE-AC05
• B
  Battelle

  Awards: AC05-76RL01830, DE-AC05, DE-AC05-76RL01830
• NC
  National Center for Atmospheric Research
• BA
  Biological and Environmental Research

  Awards: AC05-76RL01830, 76RL01830, DE-AC05-76RL01830
• PN
  Pacific Northwest National Laboratory

  Awards: DE-AC05-76RL01830, 76RL01830