Journal of Atmospheric and Oceanic Technology: Recent submissions
Now showing items 2041-2060 of 5084
-
Retrieving Storm Electric Fields from Aircraft Field Mill Data. Part I: Theory
(American Meteorological Society, 2006)It is shown that the problem of retrieving storm electric fields from an aircraft instrumented with several electric field mill sensors can be expressed in terms of a standard Lagrange multiplier optimization problem. The ... -
Supersaturation in the Wyoming CCN Instrument
(American Meteorological Society, 2006)Two thermal diffusion cloud condensation nuclei (CCN) instruments were intercompared using a nearly monodisperse test aerosol composed of sodium chloride and ammonium sulfate. The main objective of this work is the ... -
True Along-Track Scan to Improve Radiation Budget Estimations
(American Meteorological Society, 2006)Multiangle approaches for radiance-to-flux conversion require accurate coregistration between the observations from nadir- and oblique-viewing directions. The along-track mode of Earth Radiation Budget (ERB) scanning ... -
An Automated 2D Multipass Doppler Radar Velocity Dealiasing Scheme
(American Meteorological Society, 2006)An automated 2D multipass velocity dealiasing scheme has been developed to correct velocity fields when wind velocities are very large compared to the Nyquist velocity of the weather Doppler radars. The new velocity ... -
Identification and Removal of Ground Echoes and Anomalous Propagation Using the Characteristics of Radar Echoes
(American Meteorological Society, 2006)This paper explores the removal of normal ground echoes (GREs) and anomalous propagation (AP) in ground-based radars using a fuzzy logic approach. Membership functions and their weights are derived from the characteristics ... -
Simulation of X-Band Rainfall Observations from S-Band Radar Data
(American Meteorological Society, 2006)To design X-band radar systems as well as evaluate algorithm development, it is useful to have simultaneous X-band observation with and without the impact of path attenuation. One way to develop that dataset is through ... -
Total Lightning Observations with the New and Improved Los Alamos Sferic Array (LASA)
(American Meteorological Society, 2006)Since 1998, Los Alamos National Laboratory (LANL) has deployed an array of fast electric field change sensors in New Mexico and Florida in support of LANL?s satellite lightning observations. In April 2004, all the sensors ... -
An Approximate Footprint Model for Flux Measurements in the Convective Boundary Layer
(American Meteorological Society, 2006)An explicit footprint model for flux measurements of passive scalars in the lower part of the convective boundary layer (CBL) is introduced. A simple footprint model is derived analytically in an idealized CBL. The simple ... -
Data Quality of the Meteo-France C-Band Polarimetric Radar
(American Meteorological Society, 2006)The French operational radar network is being upgraded and expanded from 2002 to 2006 by Meteo-France in partnership with the French Ministry of the Environment. A detailed examination of the quality of the raw polarimetric ... -
A Chemical Ionization Mass Spectrometer for Ground-Based Measurements of Nitric Acid
(American Meteorological Society, 2006)A chemical ionization mass spectrometer (CIMS) instrument has been developed for high-precision measurements of gaseous nitric acid (HNO3) specifically under high- and variable-humidity conditions in the boundary layer. ... -
Ground Clutter Filtering Dual-Polarized, Staggered PRT Sequences
(American Meteorological Society, 2006)A procedure to filter the ground clutter from a dual-polarized, staggered pulse repetition time (PRT) sequence and recover the complex spectral coefficients of the weather signal is presented. While magnitude spectra are ... -
In Situ Cloud Sensing with Multiple Scattering Lidar: Design and Validation of an Airborne Sensor
(American Meteorological Society, 2006)The in situ cloud lidar is designed to measure cloud volumes of millions of cubic meters to overcome the sampling limitations of traditional cloud probes in inhomogeneous clouds. This technique sends laser pulses horizontally ... -
A Radar Simulator for High-Resolution Nonhydrostatic Models
(American Meteorological Society, 2006)A full radar simulator for high-resolution (1?5 km) nonhydrostatic models has been developed within the research nonhydrostatic mesoscale atmospheric (Meso-NH) model. This simulator is made up of building blocks, each of ... -
Performance Assessment of the World Wide Lightning Location Network (WWLLN), Using the Los Alamos Sferic Array (LASA) as Ground Truth
(American Meteorological Society, 2006)The World Wide Lighting Location Network (WWLLN) locates lightning globally, using sparsely distributed very low frequency (VLF) detection stations. Due to WWLLN?s detection at VLF (in this case ?10 kHz), the lightning ... -
Simulated Doppler Velocity Signatures of Evolving Tornado-Like Vortices
(American Meteorological Society, 2006)Exact solutions of the Navier?Stokes or Euler equations of motion and the continuity equation in cylindrical coordinates for 3D, axisymmetric, inviscid, or laminar flows are utilized to represent evolving vortices that ... -
Noise Reduction of Atmospheric Emitted Radiance Interferometer (AERI) Observations Using Principal Component Analysis
(American Meteorological Society, 2006)A principal component noise filter has been applied to ground-based high-spectral-resolution infrared radiance observations collected by the Atmospheric Emitted Radiance Interferometers (AERIs) deployed by the Atmospheric ... -
Improved Level-3 Oceanic Rainfall Retrieval from Dual-Frequency Spaceborne Radar Altimeter Systems
(American Meteorological Society, 2006)Since the launch of the Ocean Topography Experiment (TOPEX)/Poseidon in 1992, several studies have demonstrated that dual-frequency altimeter measurements cannot only accurately detect rain events but can also be used to ... -
Field Results from a Second-Generation Ocean/Lake Surface Contact Heat Flux, Solar Irradiance, and Temperature Measurement Instrument—The Multisensor Float
(American Meteorological Society, 2007)This paper describes results from two field programs that support development of a wave-following surface contact multisensor float (MSF) designed to simultaneously measure net surface heat flux, net solar irradiance, and ... -
Estimating Soil Wetness from the GOES Sounder
(American Meteorological Society, 2006)In this note, the relationship between the observed daytime rise in surface radiative temperature, derived from the Geostationary Operational Environmental Satellites (GOES) sounder clear-sky data, and modeled soil moisture ... -
Sources of Errors in Rainfall Measurements by Polarimetric Radar: Variability of Drop Size Distributions, Observational Noise, and Variation of Relationships between R and Polarimetric Parameters
(American Meteorological Society, 2006)Using a set of long-term disdrometric data and of actual radar measurements from the McGill S-band operational polarimetric radar, several sources of errors in rain measurement with polarimetric radar are explored in order ...