Title of Presentation - University of Exeter Blogs

Title of Presentation - University of Exeter Blogs

CLARIFY-2016 Cloud characterisation and aerosol-cloud-interaction flight planning Steven Abel, 29th February 2016, Birmingham Strawman flight plans 1. Cloud characterisation

Sc cloud and BBA separated in the vertical - expect this to occur frequently. Flight would aim to characterise the BBA and MBL aerosol, MBL structure and cloud properties. Useful for model evaluation and semi-direct studies. Could also provide data for the direct radiative effect of aerosol above cloud. 2. BBA entrained into top of Sc More of a focus on cloud top region expect this to occur episodically and model forecasts will

be key to position the aircraft. Look for evidence of BBA in-cloud (CVI) and/or sub-cloud layer Example profiles from SAFARI Clear slot above Sc typically observed Cloud drop conc = 150 cm-3

Clear slot often a vertically thin layer need to focus on cloud top region when looking at BBA entrainment Slightly elevated aerosol and CO sitting on top of Sc BBA entrained into cloud top? Cloud drop conc = 200 cm-3

Flight A787- Keil and Haywood (2003) Mid-level cloud Mid-level cloud at the top of the BBA layer expect this to occur episodically but possibly easier to forecast from the model than BBA entrained into Sc. Mid-level cloud

Example from SAFARI-2000 flight A788 Mid-level cloud encountered on profile out of Windhoek. Cloud top temperature -14 C Precipitation susceptibility Proposal: Precipitation susceptibility (dlnP/dlnNccn) will be determined from measurements of precipitation rate, cloud water contents, cloud thickness and CCN

concentrations. Compositing of cloud columns with a given thickness (or LWP) allows derivation of the relation between changes in precipitation and aerosol perturbations. Is this achievable? Requires decent statistics in varying precipitation and aerosol condtions. Suggestion: Have a standard run that is done as often as possible on every sortie where there is Sc transits, radiation flights where there is cloud etc. Run 500 ft below cloud base to measure Precipitation rate from particle size distribution

LWP from MARSS radiometer Aerosol concentration from PCASP or CCN If we get enough statistics then can calculate dlnP/dlnNccn as a function of LWP Assumes cloud drops formed on MBL aerosol i.e. Not entrained BBA. Co-ordination with LASIC AMF at Ascension on transit Good chance we will observe

shallow Cu instead of Sc. Flight in co-ordination with radar scanning radar boundary-layer RHIs towards documenting cloud vertical structure ~200 deg view. est. 5 km range at 1.5 deg elevation hits cloud base

Questions? view offshore from ARM site 365 m FAAM aircraft range (5 hr flight) Rings show approximate time available on task with a

transit at either 5 kft or 24 kft

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