Journal ArticleDOI
A procedure to correct airborne doppler radar data for navigation errors using the echo returned from the Earth's surface
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In this article, a scan-by-scan analysis of the earth's surface reflectivity and velocity is used to correct for errors in navigation and radar pointing angles, including errors in aircraft altitude, aircraft speed and drift, aircraft vertical velocity, aircraft pitch and roll, radar ranging error, and error in antenna spin angle.Abstract:
The development of airborne Doppler radars for atmospheric sciences research has vastly improved the ability to measure atmospheric storms. This paper addresses a new technique for improving airborne Doppler radar data quality. Assuming the earth's surface is flat and still, the technique uses the airborne radar measurements of the earth's surface reflectivity and velocity to correct for errors in navigation and radar pointing angles. The methodology makes use of the helical scanning adopted in the existing systems onboard the two National Oceanic and Atmospheric Administration P3 aircraft and on the National Center for Atmospheric Research Electra aircraft (ELDORA/ASTRAIA radar). On the basis of a scan-by-scan analysis, it is shown that this methodology has the potential to retrieve most of the navigation errors, including errors in aircraft altitude, aircraft speed and drift, aircraft vertical velocity, aircraft pitch and roll, radar ranging error, and error in antenna spin angle. The methodolo...read more
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Journal ArticleDOI
Air-Sea Enthalpy and Momentum Exchange at Major Hurricane Wind Speeds Observed during CBLAST
TL;DR: In this article, an analysis of six missions from the 2003 Coupled Boundary Layers Air-Sea Transfer (CBLAST) field program in major hurricanes Fabian and Isabel using a new variational technique was conducted using a near-surface mean drag coefficient CD of 2.4 × 10−3 with a 46% standard deviation and a mean enthalpy coefficient CK of 1.0 × 1...
Air–Sea Enthalpy and Momentum Exchange at Major Hurricane Wind Speeds Observed during CBLAST
TL;DR: In this paper, an analysis of six missions from the 2003 Coupled Boundary Layers Air-Sea Transfer (CBLAST) field program in major hurricanes Fabian and Isabel using a new variational technique was conducted using a near-surface mean drag coefficient CD of 2.4 × 10−3 with a 46% standard deviation and a mean enthalpy coefficient CK of 1.0 × 1...
Journal ArticleDOI
Kinematic structure of convective-scale elements in the rainbands of Hurricanes Katrina and Rita (2005)
Deanna A. Hence,Robert A. Houze +1 more
TL;DR: In the case of hurricanes Katrina and Rita, the authors of as mentioned in this paper showed that the overturning updrafts of the convective cells tilt, stretch, and vertically transport vorticity such that the convergence of the vertical flux of vortivity strengthened the vortification anomaly associated with the secondary horizontal wind maximum (SHWM).
Journal ArticleDOI
The EDOP radar system on the high-altitude NASA ER-2 aircraft
Gerald M. Heymsfield,S.W. Bidwell,I. Jeff Caylor,Syed Ameen,Shaun Nicholson,Wayne Boncyk,L. S. Miller,Doug Vandemark,Paul Racette,Louis R. Dod +9 more
TL;DR: The NASA ER-2 Doppler radar (EDOP) as mentioned in this paper is a fully coherent radar with fixed and forward pointing (33° off nadir) beams, which can map out wind and reflectivities in the vertical plane along the aircraft motion vector.
Journal ArticleDOI
Observations of the Finescale Structure of a Dryline during VORTEX 95
TL;DR: The three-dimensional finescale structure of a dryline observed over the Texas panhandle during the Verification of the Origins in Tornadoes Experiment (VORTEX) on 6 May 1995 is presented in this article.