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Atmosphere 2017, 8(2), 30; doi:10.3390/atmos8020030

Observations of a Cold Front at High Spatiotemporal Resolution Using an X-Band Phased Array Imaging Radar

1
Advanced Radar Research Center, University of Oklahoma, Norman, OK 73019, USA
2
School of Meteorology, University of Oklahoma, Norman, OK 73019, USA
3
School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Guifu Zhang
Received: 30 October 2016 / Accepted: 7 January 2017 / Published: 6 February 2017
(This article belongs to the Special Issue Radar Meteorology)
View Full-Text   |   Download PDF [4668 KB, uploaded 6 February 2017]   |  

Abstract

While the vertical structure of cold fronts has been studied using various methods, previous research has shown that traditional methods of observing meteorological phenomena (such as pencil-beam radars in PPI/volumetric mode) are not well-suited for resolving small-scale cold front phenomena, due to relatively low spatiotemporal resolution. Additionally, non-simultaneous elevation sampling within a vertical cross-section can lead to errors in analysis, as differential vertical advection cannot be distinguished from temporal evolution. In this study, a cold front from 19 September 2015 is analyzed using the Atmospheric Imaging Radar (AIR). The AIR transmits a 20-degree fan beam in elevation, and digital beamforming is used on receive to generate simultaneous receive beams. This mobile, X-band, phased-array radar offers temporal sampling on the order of 1 s (while in RHI mode), range sampling of 30 m (37.5 m native resolution), and continuous, arbitrarily oversampled data in the vertical dimension. Here, 0.5-degree sampling is used in elevation (1-degree native resolution). This study is the first in which a cold front has been studied via imaging radar. The ability of the AIR to obtain simultaneous RHIs at high temporal sampling rates without mechanical steering allows for analysis of features such as Kelvin-Helmholtz instabilities and feeder flow. View Full-Text
Keywords: cold front; phased array; Kelvin-Helmholtz instability; KHI; imaging radar; feeder flow cold front; phased array; Kelvin-Helmholtz instability; KHI; imaging radar; feeder flow
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Mahre, A.; Yu, T.-Y.; Palmer, R.D.; Kurdzo, J.M. Observations of a Cold Front at High Spatiotemporal Resolution Using an X-Band Phased Array Imaging Radar. Atmosphere 2017, 8, 30.

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