The Facility for Airborne Atmospheric Measurements FAAM BAe146

The Facility for Airborne Atmospheric Measurements (FAAM) BAe-146 Steve Abel First VOCALS Regional Experiment (REx) Preparatory Workshop © Crown copyright June 11 -12 2007 Page 1

Outline § Brief overview of the BAe-146 aircraft § Participation in VOCALS (Aims, flight hours etc) § Instrumentation and capabilities § Aircraft endurance in VOCALS © Crown copyright Page 2

The FAAM BAe-146 aircraft http: //www. faam. ac. uk/ © Crown copyright Page 3

The FAAM BAe-146 aircraft © Crown copyright Page 4

Inside the Aircraft Maximum of 18 scientists © Crown copyright Page 5

Aims Focus on the relationship between microphysics and the cloud macrostructure, exploring in particular some of the following issues: • The physical and chemical properties of aerosol within and above the boundary layer and its relationship to natural or anthropogenic sources. Include the characterisation of distinct aerosol plumes from anthropogenic sources • The extent to which drizzle formation within the cloud layer can be related to aerosol characteristics (mass loading, number concentration and speciation) • The role of drizzle in generating large variations in the liquid water path • The relative role of anthropogenic aerosol in determining the droplet effective radius and SW cloud radiative forcing of cloud in the region. In addition to these primary interests, we will also be seeking to obtain measurements that help to validate other aspects of physical parametrizations relevant to the stratocumulus-topped boundary layer: • Cloud-top entrainment and its relationship to the radiative flux divergence • Measurements of TKE within the boundary layer to inform the extent to which it is damped by drizzle. © Crown copyright Page 6

BAe-146 participation in VOCALS Currently scheduled to arrive in Chile on 8 th Nov 2008 and depart on 26 th Nov 2008 Looking at possibility of bringing this forward (up to 3 weeks) for more overlap with the C-130 Total of 120 flight hours including transit 15 potential flight days 10 flights ~ 5 - 5. 5 hrs duration Day and night flights possible Min altitude: 50 ft Maximum altitude: 35, 000 ft The BAe-146 measurements will provide important additional information of cloud microphysics, aerosols, and cloud radiative properties © Crown copyright Page 7

Instrumentation During VOCALS the BAe-146 will be in it’s radiation and cloud/aerosol physics mode. In addition to this instrumentation (see next slides) the aircraft will be fitted with • Core chemistry: CO, O 3, NOx • Thermodynamics: Temperature, Humidity, Pressure…… • Dynamics: Turbulence probe • Sondes • Video Cameras: Upward, Downward, Forward, Rear © Crown copyright Page 8

Aerosol and Cloud Measurements: Size Spectra SMPS UHSAS PCASP FFSSP CDP SID-2 2 D-C 2 D-P CIP-25 CIP-100 2 D-S CAPS (CAS + CIP) © Crown copyright Core Non-core Page 9

Aerosol and Cloud Measurements: Bulk LWC: Johnson Williams, Nevzerov LWC, Nevzerov TWC Total Water Content: Liquid + Ice + Vapour (Lynman-α absorption hygrometer) CCN: Dual channel continuous flow Condensation Particle Counter: TSI-3025 A Aerosol concentration > 3 nm Aerosol Mass Spectrometer: Mass of non-refractory components of aerosol particles as a function of size (50 – 500 nm) Single Particle Soot Photometer (SP 2): Black carbon mass (single particle basis) Filters: Sub and Supermicron CVI: Counter Flow Virtual Impactor (Residual particle & vapour from cloud drops) Nephelometer: Aerosol scattering (dry) at λ = 450, 550, 700 nm Wet Nephelometer: Aerosol scattering f(RH) at λ = 450, 550, 700 nm PSAP: absorption at λ = 567 nm © Crown. Aerosol copyright Page 10

Radiation Instrumentation Microwave Radiometer (MARSS): Upward and downward pointing (+40 to -40 deg) 5 channels 89 -183 GHz Derive LWP, T + q structure Shortwave Spectrometer (SWS): Pointable high resolution spectrometer measuring radiance across spectral range 0. 3 – 1. 7 μm MODIS type retrievals of cloud properties Spectral Hemispheric Irradiance Measurement (SHIM): As SWS but hemispherically integrating. Mounted on top and bottom of aircraft. Derive cloud optical depth Broad Band Radiometers: Derive cloud optical depth Heiman Radiometer: Sea surface temperature Airborne Research Interferometer Evaluation System (ARIES): Interferometer producing high resolution spectra 18 – 3. 3 μm. Retrieve profiles of gases (CO 2, H 2 O, O 3 etc) and sea surface temperature. Cloud info incl cloud top temp…… LIDAR: O 3, H 2 O, aerosol profiles. Unlikely due to weight impact on endurance. © Crown copyright Page 11

Aircraft Endurance Based at Iquique: 5 hrs Based at Arica: 5 hrs 25 mins Dependent on scientific payload Difference is due to diversion airports © Crown copyright Page 12

Aircraft Endurance ~ 1– 1. 5 hr dependant on FL Transit to 75 o. W at medium level and have approximately 3 hours on task in the region © Crown copyright Page 13 MODIS image courtesy of MODIS Rapid Response Project at NASA/GSFC