Journal of Atmospheric and Oceanic Technology: Recent submissions
Now showing items 2801-2820 of 5084
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A Geometry-Based Approach to Identifying Cloud Shadows in the VIIRS Cloud Mask Algorithm for NPOESS
(American Meteorological Society, 2009)A geometry-based approach is presented to identify cloud shadows using an automated cloud classification algorithm developed for the National Polar-orbiting Operational Environmental Satellite System (NPOESS) program. These ... -
Simulation of Coherent Radar Imaging Using Continuous Wave Noise Radar
(American Meteorological Society, 2009)A computationally simple cross-correlation model for multiple backscattering from a continuous wave (CW) noise radar is developed and verified with theoretical analysis and brute-force time-domain simulations. Based on ... -
Optimal Noise Filtering for the Ionospheric Correction of GPS Radio Occultation Signals
(American Meteorological Society, 2009)GPS radio occultation remote sensing of the neutral atmosphere requires ionospheric correction of L1 and L2 signals. The ionosphere-corrected variables derived from radio occultation signals?such as the phase, Doppler, and ... -
Implementation and Analysis of Networked Radar Refractivity Retrieval
(American Meteorological Society, 2009)The surface-layer moisture field can be obtained by estimating the refractive index of air, measured in parts per million, and is referred to as refractivity. A technique to estimate the refractivity by using radar has ... -
The Effects of Precipitation on Cloud Droplet Measurement Devices
(American Meteorological Society, 2009)Aircraft in situ observations of precipitation during the Rain in Cumulus over the Ocean (RICO) field project are used to study and parameterize the effects of precipitation on cloud probes. Specifically, the effects of ... -
Can a Unique Model Describe the Raindrop Shape–Size Relation? A Clue from Polarimetric Radar Measurements
(American Meteorological Society, 2009)A method is proposed to retrieve raindrop shape?size relations from the radar measurements of reflectivity factor Zh, differential reflectivity Zdr, and specific differential phase Kdp at S band. This procedure is obtained ... -
The Influences of TOVS Radiance Assimilation on Temperature and Moisture Tendencies in JRA-25 and ERA-40
(American Meteorological Society, 2009)A Japanese long-term reanalysis (JRA-25) was completed in 2006 utilizing the comprehensive set of observations from the 40-yr ECMWF Re-Analysis (ERA-40). JRA-25 and ERA-40 adopted the same type of assimilation systems: ... -
Removal of Contaminated Pixels from the Desert Target for AVHRR Vicarious Calibration
(American Meteorological Society, 2009)Desert-based vicarious calibration plays an important role in generating long-term reliable satellite radiances for the visible and near-infrared channels of the Advanced Very High Resolution Radiometer (AVHRR). Lacking ... -
Spectral Polarimetric Radar Clutter Suppression to Enhance Atmospheric Echoes
(American Meteorological Society, 2009)The clutter present in the Doppler spectra of atmospheric targets can be removed by using polarimetry. The purpose is to suppress the Doppler velocity bins where spectral polarimetric parameters have atypical values. This ... -
Effects of Rain Gauge Temporal Resolution on the Specification of a Z–R Relationship
(American Meteorological Society, 2009)The weather radar is an efficient alternative for measuring spatially varying rainfall covering a large area at a high temporal resolution. This paper studies the impact of rainfall gauge temporal resolution on optimal ... -
An Application of Reflectivity Climatology in Constructing Radar Hybrid Scans over Complex Terrain
(American Meteorological Society, 2009)Three years? worth of radar reflectivity data from four radars in an area of complex terrain (Taiwan) from 2005 to 2007 were analyzed and a reflectivity climatology was developed. The climatology was applied in the ... -
Weather Radar Ground Clutter. Part I: Identification, Modeling, and Simulation
(American Meteorological Society, 2009)Real-time ground-clutter identification and subsequent filtering of clutter-contaminated data is addressed in this two-part paper. Part I focuses on the identification, modeling, and simulation of S-band ground-clutter ... -
Weather Radar Ground Clutter. Part II: Real-Time Identification and Filtering
(American Meteorological Society, 2009)The identification and mitigation of anomalous propagation (AP) and normal propagation (NP) ground clutter is an ongoing problem in radar meteorology. Scatter from ground-clutter targets routinely contaminates radar data ... -
EDITORIAL
(American Meteorological Society, 2009) -
The Use of Coherency to Improve Signal Detection in Dual-Polarization Weather Radars
(American Meteorological Society, 2009)Currently, signal detection and censoring in operational weather radars is performed by using thresholds of the estimated signal-to-noise ratio (SNR) and/or the magnitude of the autocorrelation coefficient at the first ... -
The Use of Insects as Tracers for “Clear-Air” Boundary-Layer Studies by Doppler Radar
(American Meteorological Society, 1991)Single- and multiple-Doppler radar systems are increasingly being used to monitor circulations within the clear-air boundary layer where the scatterers may be gradients of the refractive index or biota or a combination of ... -
Spurious Velocities in Doppler Radar Data Caused by a Moving Antenna Feedhorn
(American Meteorological Society, 1991)Modern Doppler weather radars use clutter filtering to reduce the strength of ground targets and enhance the detection of meteorological echoes. WSR-88D [NEXRAD (Next Generation Radar) and TDWR (Terminal Doppler Weather ... -
Position-logging Drifting Buoys Using Decca Navigator and Argos for High-Resolution Spatial Sampling
(American Meteorological Society, 1991)The need for a precision current-tracking system that could he deployed for up to 12 months as part of the U.K. Natural Environment Research Council's North Sea Project led to the development of a position-logging drifting ... -
Radar System Errors in Polarization Diversity Measurements
(American Meteorological Society, 1984)The measurement capability of a polarization diversity radar is limited by several characteristics of the system and particularly by the performance of the antenna, which is characterized by the integrated cancellation ... -
Measuring Mean Velocities with POGO
(American Meteorological Society, 1991)POGO is a simple technique for measuring water transport between the surface and some preselected depth. Equipped with a 12-kHz pinger for tracking and range measurement, a xenon flasher for nighttime relocation, and a VHF ...