Journal of Atmospheric and Oceanic Technology: Recent submissions
Now showing items 3101-3120 of 5084
-
A Doppler Radar Emulator with an Application to the Detectability of Tornadic Signatures
(American Meteorological Society, 2007)A Doppler radar emulator was developed to simulate the expected mean returns from scanning radar, including pulse-to-pulse variability associated with changes in viewing angle and atmospheric structure. Based on the user?s ... -
Elevated Cloud and Aerosol Layer Retrievals from Micropulse Lidar Signal Profiles
(American Meteorological Society, 2008)A threshold-based detection algorithm for cloud and aerosol layer heights in elevated micropulse lidar data (0.523 ?m) is described. Thresholds for differentiating cloud and aerosol signals from that of the molecular ... -
Improved Daytime Column-Integrated Precipitable Water Vapor from Vaisala Radiosonde Humidity Sensors
(American Meteorological Society, 2008)Accurate water vapor profiles from radiosondes are essential for long-term climate prediction, weather prediction, validation of remote sensing retrievals, and other applications. The Vaisala RS80, RS90, and RS92 radiosondes ... -
Classification of Tropical Precipitating Systems Using Wind Profiler Spectral Moments. Part II: Statistical Characteristics of Rainfall Systems and Sensitivity Analysis
(American Meteorological Society, 2008)An automated precipitation algorithm to classify tropical precipitating systems has been described in a companion paper (Part I). In this paper, the algorithm has been applied to 18 months of lower atmospheric wind profiler ... -
Classification of Tropical Precipitating Systems Using Wind Profiler Spectral Moments. Part I: Algorithm Description and Validation
(American Meteorological Society, 2008)The lower atmospheric wind profiler (LAWP) measurements made at Gadanki, India, have been used to develop an objective algorithm to classify the tropical precipitating systems. A detailed investigation on the existing ... -
Simulating Range Oversampled Doppler Radar Profiles of Inhomogeneous Targets
(American Meteorological Society, 2008)A new technique for generating range oversampled profiles of Doppler radar signals that have been backscattered by distributed targets is presented in this paper. The technique was developed for spaceborne cloud radars, ... -
Warming Break Trends and Fractional Integration in the Northern, Southern, and Global Temperature Anomaly Series
(American Meteorological Society, 2008)This paper deals with the estimation of time trends in temperature anomaly series. However, instead of imposing that the estimated residuals from the time trends are covariance stationary processes with spectral density ... -
A Scalable Datalogging System with Serial Interfaces and Integrated GPS Time Stamping
(American Meteorological Society, 2008)A scalable datalogging system for micrometeorological, fast-response, in situ, and remote sensing applications is presented. The system is based on a standard x86 MINI-ITX computer and the open-source operating system ... -
Ceilometer Retrieval of the Boundary Layer Vertical Aerosol Extinction Structure
(American Meteorological Society, 2008)The CT25K ceilometer is a general-purpose cloud height sensor employing lidar technology for detection of clouds. In this paper it is shown that it can also be used to retrieve aerosol optical properties in the boundary ... -
Reducing Uncertainties of SNO-Estimated Intersatellite AMSU-A Brightness Temperature Biases for Surface-Sensitive Channels
(American Meteorological Society, 2008)In this study, a technique has been developed to improve collocation of two passive-microwave satellite instrument datasets at a simultaneous nadir overpass (SNO). The technique has been designed for the purpose of reducing ... -
An Approximation to the Effective Beam Weighting Function for Scanning Meteorological Radars with an Axisymmetric Antenna Pattern
(American Meteorological Society, 2008)To obtain statistically stable reflectivity measurements by meteorological radars, it is common practice to average over several consecutive pulses during which the antenna rotates at a certain angular velocity. Taking ... -
Tornado Detection Using a Neuro–Fuzzy System to Integrate Shear and Spectral Signatures
(American Meteorological Society, 2008)Tornado vortices observed from Doppler radars are often associated with strong azimuthal shear and Doppler spectra that are wide and flattened. The current operational tornado detection algorithm (TDA) primarily searches ... -
Assessment of the Visible Channel Calibrations of the VIRS on TRMM and MODIS on Aqua and Terra
(American Meteorological Society, 2008)Several recent research satellites carry self-calibrating multispectral imagers that can be used for calibrating operational imagers lacking complete self-calibrating capabilities. In particular, the visible (VIS, 0.65 ?m) ... -
Distinguishing Aerosols from Clouds in Global, Multispectral Satellite Data with Automated Cloud Classification Algorithms
(American Meteorological Society, 2008)A new approach is presented to distinguish between clouds and heavy aerosols with automated cloud classification algorithms developed for the National Polar-orbiting Operational Environmental Satellite System (NPOESS) ... -
Performance of Commercial Radiometers in Very Low Temperature and Pressure Environments Typical of Polar Regions and of the Stratosphere: A Laboratory Study
(American Meteorological Society, 2008)Characterizing the performance of ground-based commercial radiometers in cold and/or low-pressure environments is critical for developing accurate flux measurements in the polar regions and in the upper troposphere and ... -
On Deriving Vertical Air Motions from Cloud Radar Doppler Spectra
(American Meteorological Society, 2008)A method for deriving vertical air motions from cloud radar Doppler spectrum measurements is introduced. The method is applicable to cloud volumes containing small particles, in this case liquid droplets, which are assumed ... -
Unfiltering of the Geostationary Earth Radiation Budget (GERB) Data. Part I: Shortwave Radiation
(American Meteorological Society, 2008)The method used to estimate the unfiltered shortwave broadband radiance from the filtered radiances measured by the Geostationary Earth Radiation Budget (GERB) instrument is presented. This unfiltering method is used to ... -
Hydrometeor Detection Using Cloudsat—An Earth-Orbiting 94-GHz Cloud Radar
(American Meteorological Society, 2008)In late April 2006, NASA launched Cloudsat, an earth-observing satellite that uses a near-nadir-pointing millimeter-wavelength radar to probe the vertical structure of clouds and precipitation. The first step in using ... -
Analysis of Wave Height Variability Using Altimeter Measurements: Application to the Mediterranean Sea
(American Meteorological Society, 2007)Altimeter significant wave height (SWH) measurement data from six satellite missions covering 14 yr were analyzed over the Mediterranean Sea. First, data correction and screening were performed using the same method for ... -
Probing a Nonprecipitating Cold Front with Doppler Weather Radar
(American Meteorological Society, 1991)The utility of Doppler radar to study boundary-layer kinematics of a weak nonprecipitating cold front in Oklahoma on 16 October 1987 was examined with measurements from two radars. Diagnosis was impeded by operation at low ...