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Cirrus Measurements during the EAQUATE Campaign

Cirrus Measurements during the EAQUATE Campaign. C. Lee, A.J. Baran, P.N. Francis, M.D. Glew, S.M. Newman and J.P. Taylor. Outline. Overview of frontal cirrus case on 15th Sept 2004 Aircraft remote sensing and in-situ instrumentation Measurements and preliminary results

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Cirrus Measurements during the EAQUATE Campaign

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  1. Cirrus Measurements during the EAQUATE Campaign C. Lee, A.J. Baran, P.N. Francis, M.D. Glew, S.M. Newman and J.P. Taylor

  2. Outline • Overview of frontal cirrus case on 15th Sept 2004 • Aircraft remote sensing and in-situ instrumentation • Measurements and preliminary results • ARIES infrared interferometer • SWS visible and NIR spectrometer • Cloud physics probes • Summary and conclusions

  3. IR satellite images at approx AQUA overpass times Frontal cirrus case on 15th Sept 2004 1200 1400

  4. AIRS (AQUA) 11m images on 15/09/04 12:23:26-12:29:25 13:59:26-14:05:25

  5. Upward and Forward Video Cameras ADA on other side SWS on other side FAGE Inlet CVI on other side Air sample inlets BBRs SHIMS Cloud Physics Probes 5 port turbulence probe Total water probe JW Liq water Nevzerov total/liq water probe Rosemount temp probes Dropsonde on other side MARSS Deimos or IR Camera TAFTS ARIES BBRs Rearward and Downward Video Cameras Lidar SHIMS Cloud Physics Probes FAAM BAe146-301 ARA Instrumentation

  6. Remote Sensing instrumentation on FAAMon 15/09/04

  7. In-situ instrumentation on FAAM

  8. FAAM BAE146 flight track

  9. Aircraft profile

  10. ARIES average spectra at overpass 2

  11. ARIES BTs at select wavelengths during run at 2nd overpass

  12. Modelled IR and ARIES data Extinction optical thickness=3.7 Re=46um

  13. SWS nadir example spectra for thin and thick cirrus

  14. SWS radiance variation through the flight

  15. SWS radiance measured during the 2 orbits banked at 45 deg

  16. Phase functions 6-branched bullet-rosette Dist=0.12 =0.87 μm Orbit 2 Orbit 1

  17. Phase functions Polycrystal (Macke et al. 1996) Dm=100 μm for all ice crystals =0.87 μm Orbit 2 Orbit 1 First Results – Scaled Radiances at 10o - NO multiple scattering

  18. Phase Functions =0.87 μm Analytic Phase function g=0.70 (Baran et al. 2001) Orbit 1 Orbit 2

  19. Phase functions Polycrystal =1.60 μm Orbit 1 Orbit 2 50 μm 100 μm 800 μm

  20. Cloud Physics in-situ observations • Full analysis still needs to be performed • Graupel • No larger than 200um diameter seen in flight • 50 to 200/litre

  21. Summary and conclusions • Remote sensing and in-situ measurements have been obtained using FAAM BAE-146, for a frontal cirrus case on 15 Sept 2004, coincident with 2 AIRS (AQUA) overpasses. • The effective particle radius is larger than 50um, of graupel (non-symmetrical) type, with a large variability in optical thickness. • The analysis of this data set is on going. • It demonstrates the importance of using coincident observations at wavelengths from visible to submm, to determine a wide range of cirrus parameters and check the physical consistency of the models. • Future flights - CASEAR campaign based in UK in Nov 2005, May 2006 and July 2007, coincident with Chilbolton radar, AQUA, Cloudsat.

  22. Acknowledgements • FAAM • Direct Flight • BAE • Met Office instrument operators • Walter Wolf • Dave Pollard

  23. Visible MSG satellite images at AQUA overpass times on 15 Sept 2004 Frontal cirrus case 1230 1400

  24. AIRS 8m -12m for 2nd overpass 13:59:26-14:05:25

  25. Phase functions Distorted Aggregate (Yang and Liou 1998) Dist=0.13 =0.87 μm Orbit 2 Orbit 1

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