Vertical Distribution of Radar Reflectivity in Hurricanes in the Presence of Shear
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Transcript of Vertical Distribution of Radar Reflectivity in Hurricanes in the Presence of Shear
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Vertical Distribution of Radar Reflectivity in Hurricanes in the Presence of Shear
Image: NASA
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Black et al., 2002 modified by Houze 2009
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Quantifying Vertical Structure
• Hence and Houze 2011, 2012 (a,b) analyzed data from TRMM PR– Snapshots of radar reflectivity– 10+ years of data– Contoured by Frequency Altitude Diagrams
(CFADs)• 200-850hPa shear from NCEP
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Hence and Houze 2011 Reflectivity (dBZ)
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Hence and Houze 2011
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Reflectivity (dBZ)30 3040 40
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Courtesy of D. Hence
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Field Campaigns• RAINEX (2005)– Katrina: 8/28– NOAA 43
• IFEX/GRIP (2010)– Earl: 8/29, 8/30, 9/1, 9/2– NOAA 42 & 43
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Hurricane Katrina – 8/28/2005
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Shea
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Hurricane Earl – 8/30/2010
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Hurricane Earl – 8/30/2010
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Shea
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Conclusions
• Structures of Katrina and Earl at strong intensities share similarities with statistics– Intense low-level reflectivities
• Early sampling of Earl on 8/30 did not– Shear calculation issue?– Rapid Intensification?– Circulation pattern?
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EndThis research was supported by NSF grant # ATM-0743180 and NASA grant #NNX09AM73G