Experiment title 
: Experimental runs over MISO Southern Ocean/Antarctica voyage
Summary :
We are running the UM-RNS coupled to GLOMAP-mode over the MISO campaign to the Antarctic ice edge (see plot below). Our aim is to improve the model representation of aerosols and explore how this changes the cloud properties in the region.
To run the regional model we first need to run the global UM (GA8) to generate the start dumps. Then we use these start dumps to run the gloabl driving model (also GA8).
Scientific motivation:
Fiddes et al. (2025) showed that ACCESS significantly under-represents aerosols in the Southern Ocean and that improving the representation of marine aerosol does change the cloud-radiative effects. To improve this in a systematic way we use the UM-RNS which we can compare to high-resolution observations.
Experiment Name : Experimental runs over MISO Southern Ocean/Antarctica voyage
People : Sonya Fiddes, Matt Woodhouse, Alanah Chapmen, Zhangcheng Pei
Model: UM-RNS + GLOMAP (similar to ACCESS-ram3 but not the same)
Configuration: RAL3.2 + GLOMAP-mode with UM driving model. Control run: u-di850
Initial conditions: Global model
Run plan: Run driving model 2x to get start dumps for two experiments, run UM RNS once (for one of these experiments - the second will probably need to occur next quarter)
Simulation details: 1st experiment: Alter the sea spray flux parameterisation to include aitken mode. 2nd experiment: Alter the primary marine organic size contributions
Total KSUs required : 23KSU x2 (driving model) + 80 KSU (UMRNS) = TOTAL 130KSU
Total storage required : 5.7G/day x 90days = 513GB x 2 (driving model) = 1026GB + 7TB for regional model output (to start with, then can trim down as we work out what we need and what we dont need) = Total ~8TB
Outputs: start dumps for jan-march 2024 for UM GA driving model experiments, 1 week of experiment for MISO with full cloud and aerosol outputs at 10m resolution, 1.5km.
Restarts:
Related articles:
Analysis:
Control run early results: Top - map of domain + ship track, bottom: aerosol size distribution broken into different synoptic events. solid line = obs, dashed = model
Conclusion:
Adding the sea spray aitken mode and changing the size fraction of primary marine organics will hopefully improve the aerosol size distribution in the smaller sizes shown above!