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Properties and radiative effects of desert dust in the Mediterranean Alcide Giorgio di Sarra

This study explores the properties and radiative effects of desert dust in the Mediterranean area, focusing on radiation and surface energy budgets, photochemistry, air quality, and more. It examines dust aerosols, refractive index, size distribution, and radiative forcing efficiency to understand their influence on atmospheric thermal structure and dynamics as well as cloud properties.

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Properties and radiative effects of desert dust in the Mediterranean Alcide Giorgio di Sarra

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  1. Properties and radiative effects of desert dust inthe Mediterranean Alcide Giorgio di Sarra ENEA, Rome, Italy A. di Sarra 23/10/2014

  2. radiation budget surface energy budget photochemistry heterogeneous chemistry air quality/health fertilization atmospheric thermal structure/dynamics cloud properties …

  3. Nabat et al., 2013

  4. Israelevich et al., 2012 MODIS data, 2001-2010

  5. Moulin et al., 1998 METEOSAT, 1994

  6. 30 March 2013 MODIS-Terra

  7. 850 mb 1000 mb

  8. 1000 mb 850 mb

  9. 29 July 2005 MODIS-Terra

  10. Hamonou et al., 1999

  11. non-dust dust 1999-2008 Di Iorio et al., 2009

  12. Pey et al., 2013

  13. Pey et al., 2013

  14. Becagli et al., 2012

  15. Summer Winter Marine Boundary Layer BoundaryLayer over land MBL Courtesy of S. Becagli

  16. Radiative forcing ΔF = Fn,s – Fn

  17. Refractive index Size Shape

  18. REFRACTIVE INDEX Formenti et al., 2011 Scheuvens et al., 2013

  19. REFRACTIVE INDEX Di Biagio et al., 2014

  20. SIZE DISTRIBUTION 700nm 550nm dV dV 450nm dlogDp dlogDp Denjean et al., 2013 22 and 28 June 2013: Transport from Tunisia to Lampedusa 22 june 2013, F35-36 Dust aerosols Altitude (m) F38 F35 28 june 2013, F38-39 Dust aerosols  Similar dust source and days of transport but different mixing state Scat. coeff. (Mm-1) Diameter (µm) Numb. conc. (#.cm-3)

  21. SIZE DISTRIBUTION Zhao et al., 2013

  22. SHAPE Haanpanala et al., 2012 Surface direct radiative forcing

  23. VERTICAL DISTRIBUTION Gomez Amo et al., 2010

  24. All-sky clear-sky Papadimas et al., 2012 DRE TOA SW -10 0 DRE ATM SW 0 20 DRE SRF SW 2000-2007 -10 0

  25. Mueller et al., 2012 SAMUM 2006

  26. How to derive a correct estimate of the RF?

  27. Satheesh and Ramanathan, 2000 Radiative forcing efficiency

  28. PSP Cimel MFRSR PIR

  29. Surface aerosol FE: aerosol types 2004-2007 Di Biagio et al., 2010 Di Biagio et al., J. Geophys. Res., 2009

  30. Aerosol FE at the top of the atmosphere Di Biagio et al., 2010

  31. Daily mean aerosol forcing efficiency FES and FETOA at different θ integrated to obtain the daily FE The atmospheric forcing is ~30-50% of the surface forcing for DD, ~70% for UI-BB, and ~60% for MA. Di Biagio et al., 2010

  32. Daily mean aerosol radiative forcing The daily mean radiative forcing (RFd) at TOA and at the surface are largest for DD due to the high value of both FEd and average τ. The atmospheric RFd, conversely, is approximately independent of the aerosol type.

  33. March 26, 11:50 UT MODIS-TERRA March 28, 2010 MODIS-TERRA March 26, 2010 March 28, 11:50 UT

  34. MFRSR max 1.88 <0.09 PSP and PIR radiometers

  35. instantaneous, at 35° solar zenith angle, LW, SW, and total forcing, for 26 March, 2010. SW: observations on two days, surface + CERES LW: RT model + observations at the surface and CERES On a daily basis: surface LW RF is about 50% of the SW TOA LW RF is about 40% of the SW a bout 75% of the SW atmospheric RF is compensated by the LW RF di Sarra et al., 2011

  36. 9:35 UTC MODIS 22 May 2013

  37. 12:50 UTC MODIS 22 May 2013

  38. Lampedusa

  39. 22 May, 12:57 UT 23 May, 13:46 UT Sky Imager 22 May, 12:50 UT Sky Imager 20 May, 12:50 UT

  40. SW: Observations LW: Observations + MODTRAN 4.3 calculations Forcing efficiencies SW, global -136 W/m2 SW, diffuse +257 W/m2 LW +33 W/m2 LW/SW 24% instantaneous values!! Over a whole daily cycle FEd~FE/2 in the SW (di Sarra et al., 2011) LW/SW ~50%

  41. Gomez Amo et al., 2014

  42. Meloni et al., 2014 Ground-based and Airborne Measurements of the Aerosol Radiative Forcing (GAMARF) 2008

  43. Meloni et al., 2014

  44. Meloni et al., 2014

  45. Vertical distribution • Optical properties • LW effects Recommendation: Closure with respect to high quality radiation measurements Thank you

  46. Red – 2009 Green - 2010 Black – 2011 Blue -2012 Pace et al., 2012

  47. Pace et al., 2006

  48. Meloni et al., 2004 Lidar backscatter ratio JULY 14 2002 JULY 16 2002 HYSPLIT transport and dispersion model from the NOAA Air Resources Laboratory (ARL) AOD (500 nm) = 0.227 14 July α = 0.080 δ = 0.46-0.56 16 July α = 0.698 δ = 0.25-0.47

  49. Meloni et al., 2004 MISR + MFRSR

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