Aircraft Icing
Objectives of La. RC Satellite-Based Cloud & Icing Products
La. RC Products from Geostationary & Polar-Orbiting Satellites http: //www-angler. larc. nasa. gov/satimage/products. html
Analysis Applied to Two Satellites to Cover USA
Combined GOES-11/12 Retrievals, 1815 UTC, 8 Jan 2008
Indeterminate areas (white)
Upgrading Icing Nowcast Method
Winter 2006/2007 and 2007/2008 dataset Filtered dataset This method is the starting operational algorithm for the NOAA GOES-R project.
GOES Example Jan 11, 2008 (1745 UTC) This method is the starting operational algorithm for the NOAA GOES-R project.
Main Problem Areas
Multilayered Cloud Detection Using 11 & 13. 3 µm Channels
Multilayer retrievals pick up additional areas with icing that were formerly indeterminate … some areas remain undetected
Multilayer retrievals pick up additional areas with icing that were formerly indeterminate … some areas remain undetected
• Identifies icing ~ 90% of the time • Multilayer method as accurate as single-layer technique • No matching of altitudes performed
Limitations on Multilayer Detection
Impact of Snow on Icing Diagnoses Satellite analysis indicates large area of icing conditions extend from the Dakotas eastward to PA, NY and WV
NCAR Icing Analysis with PIREPS Overlay Nov 8, 2008 (1900 UTC)
Aviation Weather Center PIREPS Display Tool Nov 8, 2008 PIREPS confirm significant icing
NASA La. RC Cloud Analysis Input Nov 8, 2008 (1745 UTC)
Addressing Snow Problem
Cloud Phase, 1745 UTC, 9 November 2008
Snow Corrections • Note: This problem primarily affects LWP and, hence only icing severity. Icing is still well-detected over snow!
Other Refinements
Domain Expansion
Full-Disk Icing Potential, GOES-12 14 Mar 2008, 1745 UTC Most icing occurs poleward of 30° latitude
Icing Potential, 1800 UTC, 8 Nov 2008
RGB Significant problems with FY 2 -C
Cloud Top Height
Progress Toward “Operational” Status
Summary & Future Research
Objectives • Use NASA satellite products in a Decision Support System for Air Safety
Tasks • Retrieval code improvements (Minnis) - discussed earlier in icing presentation • Benchmarking, validation, evaluation - Bill Smith • Assimilation tests - Smith & Benjamin • Future - Benjamin
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