ERAD_2012_v2.doc - ERAD 2012 THE SEVENTH EUROPEAN...

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ERAD 2012 – THE SEVENTH EUROPEAN CONFERENCE ON RADAR IN METEOROLOGY AND HYDROLOGY Progress toward a volumetric in-flight icing hazard system for airports which incorporates operational dual-polarization S-band radars David Serke 1 , Scott Ellis 2 , Andrew Reehorst 3 , John Hubbert 2 , David Albo 1 , Andrew Weekley 1 , Daniel Adriaansen 1 , Chris Johnston 1 and Marcia Politovich 1 1 National Center for Atmospheric Research, Research Applications Lab 2 National Center for Atmospheric Research, Earth Observing Lab 3 NASA Glenn Research Center, Icing Branch (Date: June 26 th , 2012) 1. Introduction In-flight icing hazard is a significant danger to aircraft, and its detection is a priority for the United States' Federal Aviation Administration. Supercooled liquid is currently impossible to detect remotely with any single instrument. Several different in-flight icing detection products have been developed within the last ten years including the National Center for Atmospheric Research's 'Current Icing Product' (Bernstein et al., 2005) and the 'NASA Icing Remote Sensing System' (NIRSS, Reehorst et al., 2005). NASA, with NCAR as a contractor, have been developing NIRSS as a package of relatively inexpensive, existing instrumentation to detect, range and qualify in-flight icing hazard in the airport environment. A recent three year comparison study suggests that NIRSS is highly effective at detecting the presence and absence of in-flight icing (Johnston et al., 2011). The next step required in the development of NIRSS is expansion of the vertically pointing algorithm to a volumetric airport environment product, which will be discussed later in this work. While in-flight icing detection has been proven to be aided by inclusion of ground-based Ka-band cloud radar, the utility of longer wavelengths such as S-band weather radars has been limited since larger particles tend to dominate returned power. Since the end of 2011, the United States National Weather Service has begun a program to retrofit the network of S- band WSR-88D radars to include dual polarization capabilities. Recent studies have shown that certain in-flight icing scenarios are detectable with moment fields acquired from polarized research radars that were located near the NASA Icing Remote Sensing System. With this in mind, NIRSS was brought to the Front Range of Colorado for the 2010-2011 winter season to collect in-flight icing cases (Serke et al., 2011) while Colorado State University's CHILL research S-band radar (Brunkow et al., 2000) collected range versus height data above the NIRSS location. This field program provided a unique set of cases where Ka-band, polarized S-band and radiometers were collecting coincident data in icing and non-icing conditions. With NIRSS and pilot reports of icing as verification, the authors were able to build and test a new icing algorithm that utilizes polarized S-band data from high quality, highly calibrated research radar moments (Ellis et al., 2011).
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