Atmosphere WG Meeting 23/10/24 minutes
15 participants
Luke Harrison - Update from ACCESS APS2-APS3 changes and impacts on cloud clover over the Great Barrier Reef.
- Working on Marine Cloud Brightening (MCB)
- Using aerosols to increase albedo of low marine clouds
- Using CSIRO eReefs currently forced with BARRA-R1. Before that tthey were using ACCESS-R.
- Large difference in Oktas over summer periods (Dec-May) from 2015-16 b/w BARRA R1, R2 and ACCESS-R.
- Compared against Himawari-8 cloud products.
- Even though the Himawari cloud is probably biased high (because it can’t detect low clouds under high ones), results suggest the models continue to underpredict amounts of low cloud.
- Q : from Charmaine. Cloud cover doesn’t necessarily take into account optical properties (e.g. surface radiation, optical depth)
- Q : From Yi. Dan Harrison has a report where we compared cloud cover statistics against different satellite cloud products. Products with active sensors are probably a better source of ground truth.
- Q : From Paul. Celiometer data at coastal airports another source of ground truth?
Charmaine Franklin - R&D workshop summary
- First joint workshop with the UM Momentum partnership.
- UKMO has had operational convective-scale modelling (UKV) since 2010. BoM since 2017 (ACCESS-C2).
- Collaboration to build a km-scale science configuration that works at mid-latitude and tropics (RAL3)
- 265 registrations with strong international presence and Australian academic community.
- A lot of talks on the NextGen model (Lfric) as UM development has now ceased.
- RAL3.3 has been approved and regional suites (nesting, ensemble nesting and coupled) are being updated to UM13.5. Will be available on NCI soon!
- RAL3.0 can miss heavy rainfall due to implementation with new cloud microphysics suite CASIM
- Convective Scale Evaluation Toolkit (CSET) tutorial was very popular
- LFric training was held next week, both global and regional. Visualisation is different as the grid is no longer a regular lat/lon
- Good interaction b/w researchers and forecasters
- Workshop website contains all the presentations and slides
Zhangcheng Pei - UTAS. Antarctic Cloud simulation
- Running UM v13.0 in RAL3.1 (CASIM + Bimodal) at 1.5 km at 10 minute resolution, embedded in ERA5 centred at Davis station on Antarctic coast.
- Case studies on significant snowfall.
- Experiments with aerosol climatologies, changing Cloud Drop Number, improved orography and V21 INP parameterization.
- Aerosol climatology underestimates aerosol concentrations.
- V21 INP enhances liquid water and improves downwelling long-wave radiation, at the cost of overly diminishing short-wave radiation.
- Uses EMC squared simulator to allow model/obs comparison which may be of greater interest. This is now integrated into a suite to allow pseduo lidar/radar products (in this case)
- Q : Yi, what kind of temperature ranges are we looking at?
Clare Richards - ACCESS NRI updates on records and datasets
- Frameworks for reference datasets and requests.
- Hoping to speed up approval processes.
- For Atmosphere WG requests, publication of AUS2200 datasets has been approved, currently in-progress (catalogue IDS and DOI etc). Should be ready in a few weeks
- Three datasets for next release are:
- OSTIA SSTs,
- SST/SIC Ancillary files
- UM nudging based on ERA5 at N96
Heidi - ACCESS NRI quick updated on resource availability.
- Still have 228 kSU for gx60. Apply if you need resources if you need to run an experiment.
- ‘Use it or lose it!’
- Applying for Atmosphere WG Resources
Next date?
- Pencilled in for Thu 28th?