Journal of Atmospheric and Oceanic Technology: Recent submissions
Now showing items 2301-2320 of 5084
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Velocity Error for Coherent Doppler Lidar with Pulse Accumulation
(American Meteorological Society, 2004)The random estimation or instrument error of coherent Doppler lidar velocity estimates with pulse accumulation (multiple lidar shots per velocity estimate) is determined with computer simulations for general conditions. ... -
The Computational Complexity and Parallel Scalability of Atmospheric Data Assimilation Algorithms
(American Meteorological Society, 2004)This paper quantifies the computational complexity and parallel scalability of two algorithms for four-dimensional data assimilation (4DDA) at NASA's Global Modeling and Assimilation Office (GMAO). The first, the Goddard ... -
A New Optical Instrument for Simultaneous Measurement of Raindrop Diameter and Fall Speed Distributions
(American Meteorological Society, 1984)This paper presents a recently developed optical spectro-pluviometer. The principle of the device is based upon the optical occultation of an infrared light beam by falling drops. This allows the retrieval of raindrop-size ... -
Observations of a Tropical Thunderstorm Using a Vertically Pointing, Dual-Frequency, Collinear Beam Doppler Radar
(American Meteorological Society, 1993)This paper describes an investigation of a thunderstorm that occurred in the summer of 1991 over the National Astronomy and Ionosphere Center in Arecibo, Puerto Rico. Observations were made using collinear dual-wavelength ... -
The 10-cm-Wavelength Polarimetric Weather Radar at NOAA's National Severe Storms Laboratory
(American Meteorological Society, 1993)The NSSL Doppler radar has been upgraded to include polarimetric measurements and remote operations. We discuss details of thew upgrades and specifics concerning real-time computations of polarimetric variables. Tests and ... -
An Experiment in Two-Way Communication with a Multivariable Moored System in Coastal Waters
(American Meteorological Society, 1993)An experimental data acquisition system (telepack) was interfaced with a multivariable moored system in order to transmit physical and biooptical data from a coastal mooring site to a shore-based work station. The study ... -
Improved ADCP Performance Using a Hydrodynamically Designed Boom Mount
(American Meteorological Society, 1993)This paper presents the results of the design and testing of a hydrodynamic mount for a direct-reading 150-kHz acoustic Doppler current profiler (ADCP) operated over the side of a small inshore vessel in transect mode ... -
The Transfer Function of a Differential Microbarometer
(American Meteorological Society, 1993)A differential microbarometer allowing the measurement of atmospheric pressure fluctuations with periods from 5 s to 18 h and resolution from 0,2 to 2.0 Pa is described. Experimental results of its calibration are in good ... -
Frequency Domain Interferometry Using the 1290-MHz Søndre Strømfjord Radar: First Results
(American Meteorological Society, 1993)First results from the implementation of frequency domain interferometry (FDI) using an L-band frequency of 1290 MHz are presented. To our knowledge, FDI has not previously been applied to such high-frequency measurements. ... -
A Simple Method for Measuring Deep Convection
(American Meteorological Society, 1993)The glass-pipe technology used for RAFOS floats is applied to the monitoring of convection in deep mixed layers. The velocity of a vertical current is estimated from the relationship between the drag force exerted on a ... -
The Accuracy of Voluntary Observing Ships' Meteorological Observations-Results of the VSOP-NA
(American Meteorological Society, 1993)For the Voluntary Observing Ships Special Observing Project for the North Atlantic (VSOP-NA), the layout, meteorological instrumentation, and observing practices of 45 voluntary observing ships (VOS) operating in the North ... -
Measurements of the Ice Water Content in Cirrus Using an Evaporative Technique
(American Meteorological Society, 1993)A technique for the measurement of the ice water content (IWC) of cirrus clouds is described. The IWC is obtained by the measurement of the total water content (TWC) and the subtraction of the saturation specific humidity ... -
Airflow and Water-Drop Trajectories at Instrument Sampling Points around the Beechcraft King Air and Lockheed Electra
(American Meteorological Society, 1993)Due to distortion of airflow streamlines, flow velocities and droplet size distributions measured around a moving aircraft can differ from freestream conditions. This can complicate measurements made from aircraft platforms. ... -
Center of Mass Estimation in Closed Vortices: A Verification in Principle and Practice
(American Meteorological Society, 1984)The problem of tracking closed mesoscale vortices using center of mass estimation techniques is studied. Three estimators are evaluated using data from a warm core Gulf Stream ring. The comparisons show that a method based ... -
A Technique for the Measurement of Cloud Structure on Centimeter Scales
(American Meteorological Society, 1993)A system has been developed for measuring the distance between cloud droplets along the flight path with an airborne optical particle counter. This technique resolves separation distances as small as 0.2 mm at a typical ... -
Profiling Temperature, Pressure, and Aerosol Properties Using a High Spectral Resolution Lidar Employing Atomic Blocking Filters
(American Meteorological Society, 1993)A two-channel ground-based high spectra resolution Rayleigh-Mie lidar (553.7 nm) and its operation is described. Inversion of data collected with this unique lidar system yields vertical profiles of atmospheric parameters ... -
Self-consistent Method for Determining Vertical Profiles of Aerosol and Atmospheric Properties Using a High Spectral Resolution Rayleigh-Mie Lidar
(American Meteorological Society, 1993)A self-consistent method of inverting high spectral resolution, Rayleigh-Mie lidar signals to obtain profiles of atmospheric state variables, as well as aerosol properties, is presented. Assumed are a known air pressure ... -
Backscattering by Nonspherical Hydrometeors as Calculated by the Coupled-Dipole Method: An Application in Radar Meteorology
(American Meteorological Society, 1993)The severest test of a theory of scattering by particles is how well it calculates scattering in the backward direction. The coupled-dipole method can be used for accurately calculating backscattering at 94 GHz by hexagonal ... -
Calibration of the Forward-scattering Spectrometer Probe: Modeling Scattering from a Multimode Laser Beam
(American Meteorological Society, 1993)Scattering calculations using a more detailed model of the multimode laser beam in the forward-scattering spectrometer probe (FSSP) were carried out by using a recently developed extension to Mie scattering theory. From ... -
Degradation of the VISSR Visible Sensor on GMS-3 during June 1987–December 1988
(American Meteorological Society, 1993)Degradation of the VISSR (Visible-Infrared Spin Scan Radiometer) visible sensor on the GMS-3 is estimated for a period from June 1987 to December 1988 by monitoring reflectances obtained from four targets on the earth. ...