Recently added articles from Journal of Atmospheric and Oceanic Technology:
Development of a Long-Range Lightning Detection Network for the Pacific: Construction, Calibration, and Performance*
Feb 01, 2009; ... ABSTRACT The waveguide between the earth's surface and the ionosphere allows very low-frequency (VLF) emissions generated by lightning, called sferics, to propagate over long distances. The new Pacific Lightning Detection Network (PacNet), as a part of a larger long-range lightning ...
Presenting the Snowflake Video Imager (SVI)
Feb 01, 2009; ... ABSTRACT Herein the authors introduce the Snowflake Video Imager (SVI), which is a new instrument for characterizing frozen precipitation. An SVI utilizes a video camera with sufficient frame rate, pixels, and shutter speed to record thousands of snowflake images. The camera housing and ...
Geometric Calibration of Digital Cameras for 3D Cumulus Cloud Measurements
Feb 01, 2009; ... ABSTRACT A technique for calibrating digital cameras for stereo photogrammetry of cumulus clouds is presented. It has been applied to characterize the formation of summer thunderstorms observed during the Cumulus Photogrammetric, In Situ, and Doppler Observations (CuPIDO) project ....
Snowflake Size Spectra Retrieved from a UHF Vertical Profiler
Feb 01, 2009; ... ABSTRACT This paper develops a technique for retrieving snowflake size distributions (SSDs) from a vertically pointing 915-MHz vertical profiler. Drop size distributions (DSDs) have been retrieved from 915-MHz profilers for several years using least squares minimization to determine the ...
Polarimetric Spectral Filter for Adaptive Clutter and Noise Suppression
Feb 01, 2009; ... ABSTRACT In this paper, spectral decompositions of differential reflectivity, differential phase, and copolar correlation coefficient are used to discriminate between weather and nonweather signals in the spectral domain. This approach gives a greater flexibility for discrimination ...
Radar Reflectivity-Based Estimates of Mixed Layer Depth
Feb 01, 2009; ... ABSTRACT This study investigates the potential for estimating mixed layer depth by taking advantage of the radial gradients in the radar reflectivity field produced by the large vertical gradients in water vapor mixing ratio that are characteristic of the mixing height. During the day, ...
An Analysis of the Performance of the UFAM Pulsed Doppler Lidar for Observing the Boundary Layer
Feb 01, 2009; ... ABSTRACT The performance of the 1.5-µm pulsed Doppler lidar, operated by the U.K. Universities Facility for Atmospheric Measurement (UFAM) over a 51-day continuous and unattended field deployment in southern England, is described and analyzed with a view to demonstrating the capabilities ...
Influence of Ground Clutter Contamination on Polarimetric Radar Parameters
Feb 01, 2009; ... ABSTRACT The influence of ground clutter contamination on the estimation of polarimetric radar parameters, horizontal reflectivity (Z^sub h^), differential reflectivity (Z^sub dr^), correlation coefficient (ρ^sub hv^), and differential propagation phase (φ^sub dp^) was ...
Detecting Source Regions of Wave Activities in the Tropical Atmosphere by Applying Beamforming to Interpolated Data Grids
Feb 01, 2009; ... ABSTRACT Wave activities are primary sources of weather disturbances and cyclones in the tropical atmosphere. One such activity is the intraseasonal variations in wind, convection, and precipitation in the tropical Indian and western tropical Pacific region. These variations affect the ...
Onboard Real-Time Absolute Radiometric Calibration for Thermal Infrared Channels of Chinese Geostationary Meteorological Satellites
Feb 01, 2009; ... ABSTRACT Forty-one cloud-free images of Qinghai Lake (QHL) in China and the corresponding digital numbers (DNs) of FengYun-2C (FY-2C) at 0000, 0600, 1200, and 1800 UTC from 1 July to 30 September 2005 are analyzed. The corresponding surface water temperatures of QHL measured by the ...
An Evaluation of Calibration Techniques for In Situ Carbon Dioxide Measurements Using a Programmable Portable Trace-Gas Measuring System
Feb 01, 2009; ... ABSTRACT The construction and deployment of a portable trace-gas measurement system (TGaMS) is described. The air-collection system (dubbed HYDRA) collects air samples from 18 different locations and was connected to either one or two LI-COR LI-7000 gas analyzers to measure CO2. An in ...
Mixing Measurements on an Equatorial Ocean Mooring
Feb 01, 2009; ... ABSTRACT Vaned, internally recording instruments that measure temperature fluctuations using FP07 thermistors, including fluctuations in the turbulence wavenumber band, have been built, tested, and deployed on a Tropical Atmosphere Ocean (TAO) mooring at 0°, 140°W. These were ...
Quality Control of Large Argo Datasets
Feb 01, 2009; ... ABSTRACT Argo floats have significantly improved the observation of the global ocean interior, but as the size of the database increases, so does the need for efficient tools to perform reliable quality control. It is shown here how the classical method of optimal analysis can be used to ...
The Temporal Aliasing Formulas for the Tandem Mission of Jason-1 and TOPEX/Poseidon
Feb 01, 2009; ... ABSTRACT The temporal aliasing formulas are derived for the Tandem Mission of Jason-1 and the Ocean Topography Experiment (TOPEX)/Poseidon. Previously, aliasing formulas were derived for a single satellite or a constellation of coordinated satellites, wherein the coordination is such ...
On Scatterometer Ocean Stress
Feb 01, 2009; ... ABSTRACT Scatterometers estimate the relative atmosphere-ocean motion at spatially high resolution and provide accurate inertial-scale ocean wind forcing information, which is crucial for many ocean, atmosphere, and climate applications. An empirical scatterometer ocean stress (SOS) ...
Automated Processing of Sea Surface Images for the Determination of Whitecap Coverage
Feb 01, 2009; ... ABSTRACT Sea surface images have been collected to determine the percentage whitecap coverage (W) since the late 1960s. Image processing methods have changed dramatically since the beginning of whitecap studies. An automated whitecap extraction (AWE) technique has been developed at the ...
On the Use of Satellite Altimeter Data in Argo Quality Control
Feb 01, 2009; ... ABSTRACT Satellite altimeter measurements are used to check the quality of the Argo profiling floats time series. The method compares collocated sea level anomalies from altimeter measurements and dynamic height anomalies calculated from Argo temperature and salinity profiles for each ...
Spectral Coherence and the Statistical Significance of Turbulent Flux Computations
Feb 01, 2009; ... ABSTRACT The squared spectral coherence, a frequency-domain analog of the squared correlation coefficient, identifies the frequencies at which two variables most strongly covary. A simple coherence significance test designed to determine whether coherence peaks exceed critical values ...