1. Ian Renfrew and Peter Cook
Air-sea fluxes
Ian Renfrew and Peter Cook

2. WP B.2
Objective: To quantify the contribution of surface and boundary-layer turbulent fluxes to storm development and their role in determining mesoscale PV structures.
Deliverables:
Surface turbulent flux data for high windspeed conditions to add to the small collection of such data sets.
Test and develop bulk flux parameterisation schemes, with a particular focus on the high windspeed regime.
To provide quantitative diagnostics such as heat, moisture & momentum fluxes in the ABL to aid in case study analysis and provide validation data for numerical simulations of these cases; including validation of the PV tracer diagnostic tools of WP A.1.

3. Which case studies should be a focus for validation of PV diagnostics?
Objective to determine role of diabatically-generated PV plays in evolution of mesoscale structures
Some sort of validation of the PV diagnostics that have been developed at Reading
Comparison of basic thermodynamic structure (UEA?)
Comparison of turbulent quantities (UEA?)
Comparison of latent heating rates (?)
Requires collaboration

4. Which case studies should be a focus for validation of PV diagnostics?
IOP3/B650 (23rd Sept) - Frontal wave developing on strong cold front
Ascent along front and over wave; diabatic PV structure
11 runs at 35 m, 2 flights,~10 dropsondes
IOP4/B652 (26th Nov) – Frontal structures in warm sector
Formation of mesoscale structures in ppn bands
49 runs at 40 m, 1 dropsonde
ExMix/B653 (27th Nov) – NW airflow (sea-salt aerosol observations)
27 runs at 40 m, 21 runs at 80 m
IOP6/B656 (1st Dec) – Occlusion and high winds around Shetlands
Mixing of high winds into a surface jet?
8 runs at 75 m, 2 runs at 50 m, dropsondes, Lerwick radiosondes.
IOP8/B658 (8th Dec) – Cyclone Freidhelm & sting jet
Vertical mixing of momentum?
10 runs at 450 m, 2 flights, dropsondes, radiosondes.

5. B652 – 26 November
Mission scientists: John Marsham, Geraint Vaughan, Sue Gray
Aim: Perform a single flight to measure air-sea fluxes in high winds N of Ireland.
Secondary aims to provide evaluation of mesoscale low-level structures in frontal structures embedded within warm sector of cyclone.