ACCESS-AM2 model output for 2017-2018 MARCUS and 2018-2019 CAMMPCAN RSV Aurora Australis voyages

The dataset includes model output from the ACCESS-AM2 model corresponding to the MARCUS (Measurements of Aerosols, Radiation and Clouds over the Southern Oceans) 2017-2018 voyages and the CAMMPCAN (Chemical and Mesoscale Mechanisms of Polar Cell Aerosol Nucleation) 2018-2019 voyages. The MARCUS voyages included a limited number of CAMMPCAN instruments while the CAMMPCAN voyages included the full suite of instruments. 

The model version used was ACCESS-AM2 (Australian Community Climate and Earth-System Simulator - Atmospheric Model Version 2) run with CMIP6 AMIP configuration, nudged with ERA5 reanalysis and full chemistry switched on. The model was configured with a horizontal resolution of 1.25◦ latitude and 1.875◦ longitude and 85 vertical levels. ACCESS-AM2 uses the UK Met Office’s Unified Model Global Atmosphere (UM10.6 GA7.1) as the atmosphere module, the Community Atmosphere Biosphere Land Exchange model version 2.5 (CABLE2.5) as the land-surface module and the Global Model of Aerosol Processes (GLOMAP-mode) as the aerosol module. More information on the ACCESS-AM2 model can be found at https://doi.org/10.1071/ES19033.

The data is at daily means spanning 29-10-2017 to 26-03-2018 (149 days) for MARCUS, and 25-10-2018 to 24-03-2019 (151 days) for CAMMPCAN.

Files included in this upload include:

• aa1718_cg893_track.nc: aerosol, chemistry, and meteorology model data for the MARCUS voyages
• aa1718_cg893_aerdist.nc: calculated aerosol size distribution model data for the MARCUS voyages 
• aa1819_cg893_track.nc: aerosol, chemistry, and meteorology model data for the CAMMPCAN voyages
• aa1819_cg893_aerdist.nc: calculated aerosol size distribution model data for the CAMMPCAN voyages

File names refer to Aurora Australis, voyage years (either 2017-2018 or 2018-2019), followed by the model run and data type.

An overview of the variable field names, variable long names, height profile availability and units available in the dataset is provided in VariablesOverview.xlsx. 

A Jupyter Notebook is also included and contains scripts that can be used to create figures for preliminary analysis using the model data.

Additional information:

• MARCUS details: https://asr.science.energy.gov/meetings/stm/presentations/2017/473.pdf
• CAMMPCAN details: https://findanexpert.unimelb.edu.au/project/102792-cammpcan-%E2%80%93-chemical-and-mesoscale-mechanisms-of-polar-cell-aerosol-nucleation
• MARCUS Observations: https://doi.org/10.26179/5e54ab5e5d56f
• CAMMPCAN Observations: https://doi.org/10.26179/5e546f452145d  

The GitHub repository containing the code used to produce these datasets can be found here: https://github.com/llamprey/aurora_voyages

Versions:

1.0.0: Initial Version.

1.1.0: Fixed bug where CN and CCN fields were incorrectly calculated.