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High-res Lower Boundary Layer Observations of Hurricanes Rita and Ophelia with IWRAP

Daniel Fernandez, NASA/JPL Robert Contreras, UMass. High-res Lower Boundary Layer Observations of Hurricanes Rita and Ophelia with IWRAP. IWRAP: HS2005 summary. MEASUREMENTS :

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High-res Lower Boundary Layer Observations of Hurricanes Rita and Ophelia with IWRAP

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  1. Daniel Fernandez, NASA/JPL Robert Contreras, UMass High-res Lower Boundary Layer Observations of Hurricanes Rita and Ophelia with IWRAP

  2. IWRAP: HS2005 summary MEASUREMENTS: C- and Ku-band reflectivity and Doppler velocity profiles of precipitation and ocean backscatter for Hurricanes Ophelia (Sept. 7, 9, 11, 12 and 13) and Rita (Sept. 22 and 23). PRODUCTS: Boundary Layer wind field below aircraft at 25 m (vertical) x 0.5 km (horizontal) resolution. GOAL: Process acquired datasets and extend current ABL retrievals down to the surface.

  3. Hurricane Rita, Sept. 22 Ku-band Reflectivity 1750 1500 1250 1000 750 500 250 0 55 50 45 40 35 30 25 20 Altitude (m) dBZ 17:36:55 UTC time 17:40:19

  4. Hurricane Rita, Sept. 22 Ku-band Horizontal Winds 1750 1500 1250 1000 750 500 250 0 75 70 65 60 55 50 45 40 Altitude (m) m/s

  5. Hurricane Rita, Sept. 22 Ku-band Horizontal Winds 1750 1500 1250 1000 750 500 250 0 75 70 65 60 55 50 45 40 Altitude (m) m/s

  6. Hurricane Rita, Sept. 22 Ku-band Horizontal Winds 1750 1500 1250 1000 750 500 250 0 75 70 65 60 55 50 45 40 Altitude (m) m/s

  7. Hurricane Rita, Sept. 22 Ku-band Horizontal Winds 1750 1500 1250 1000 750 500 250 0 75 70 65 60 55 50 45 40 Altitude (m) m/s

  8. Hurricane Rita, Sept. 22 Ku-band Horizontal Winds 1750 1500 1250 1000 750 500 250 0 75 70 65 60 55 50 45 40 Altitude (m) m/s

  9. Ocean Surface Backscatter Contamination Volume Backscatter Profiles

  10. Volume Backscatter Profiles Limitations in Wind Profiling of the lowest ABL Ocean Surface Echo Ocean Surface Contamination Rain Echo

  11. Doppler Spectral Profile -5 -10 -15 -20 -25 Altitude (m) dB 1493 1217 942 667 391 116 -159 Return from Precipitation Ocean Return 22 September 2005 – 19:55 GMT -110 -550 55 110 Radial Doppler Velocity (m/s)

  12. Lower Atmospheric Boundary Layer 380 250 120 -10 -140 20 15 10 5 Altitude (m) dB -110 -55 0 55 110 Radial Doppler Velocity (m/s) Spectral Filtering Algorithm Original Measurements Return from Precipitation / Winds Precipitation Profile to Surface Surface Ocean Return Ocean Surface Backscatter 22 September 2005 – 19:55 GMT 22 September 2005 – 19:55 GMT

  13. Volume Backscatter Profile Near-surface rain echo Spectral Filtering Applied

  14. Atmospheric Boundary Layer Profile 1000 Altitude (m) 100 Wind Speed (m/s)

  15. Conclusions We are not part of the RAINEX effort ─yet. Our goal for this workshop is to let you folks know what datasets we have and what products we can generate. Our questions to you are: How does high-res ABL winds down to the surface sound to you? other products? In what ways fits /complement /supplement the overall RAINEX dataset and objectives?

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