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Proceedings Paper

The use of x-band radar to support the detection of in-flight icing hazards by the NASA Icing Remote Sensing System
Author(s): David J. Serke; Marcia K. Politovich; Andrew L. Reehorst; Andrew Gaydos
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Paper Abstract

In-flight icing hazards from supercooled small drops, drizzle and freezing rain pose a threat to all aircraft. Several products have been developed to provide hazard warning of in-flight icing to the aviation community. NCAR's Current Icing Product1 (CIP) was developed to provide a near-realtime assessment of the hazard presented by supercooled liquid water (SLW) aloft in an algorithm that combines data from satellites, the Rapid Update Cycle (RUC) model, the national 2-D composite of S-band NEXRAD radar reflectivity, surface observations and pilot reports (PIREPs). NIRSS2 (Fig. 1) was developed by NASA to provide a ground-based, qualitative in-flight icing hazard assessment in the airport environment with commercially available instrumentation. The system utilizes a multichannel radiometer3, built by Radiometrics Corporation, to derive the temperature profile and integrated liquid water (ILW). NIRSS's radar is a modified airborne X-band model WU-870 made by Honeywell. The ceilometer used is a standard Vaisala CT25K Laser Ceilometer. The data from the vertically pointing ceilometer and X-band radar are only used to define the cloud bases and tops. The liquid water content (LWC) is then distributed within the cloud layers by the system software. A qualitative icing hazard profile is produced where the vertical temperature is between 0 and -20°C and there is measurable LWC.

Paper Details

Date Published: 25 August 2008
PDF: 10 pages
Proc. SPIE 7088, Remote Sensing Applications for Aviation Weather Hazard Detection and Decision Support, 70880E (25 August 2008); doi: 10.1117/12.795290
Show Author Affiliations
David J. Serke, NCAR (United States)
Marcia K. Politovich, NCAR (United States)
Andrew L. Reehorst, NASA Glenn Research Ctr. (United States)
Andrew Gaydos, NCAR (United States)

Published in SPIE Proceedings Vol. 7088:
Remote Sensing Applications for Aviation Weather Hazard Detection and Decision Support
Wayne F. Feltz; John J. Murray, Editor(s)

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