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RISMountain Waves in the Tropical Pacific Atmosphere: A Comparison of Vertical Wind Fluctuations over Pohnpei and Christmas Island Using VHF Wind Profilers
Publisher: American Meteorological Society
Abstract: We compare vertical wind fluctuations observed by VHF radar wind profilers in the tropical troposphere over a large, mountainous island (Pohnpei, at 7°N, 158°E) and a large, low-profile atoll (Christmas Island, at 2°N, ...
On the Use of Slow Ascent Meter-Scale Sampling (SAMS) Radiosondes for Observing Overturning Events in the Free Atmosphere
Publisher: American Meteorological Society
Abstract: This note describes the development of a method for obtaining high vertical resolution (meter scale) measurements of basic meteorological quantities and turbulent overturns, using radiosondes with slow ascent rates. Although ...
Long-Term Average Vertical Motions Observed by VHF Wind Profilers: The Effect of Slight Antenna-Pointing Inaccuracies
Publisher: American Meteorological Society
Abstract: This paper shows that a very slight tilt of the vertically directed antenna beam of a VHF wind profiler can produce a measurable change in the observed long-term averaged ?vertical? velocity profiles. The results are based ...
High-Resolution Atmospheric Sensing of Multiple Atmospheric Variables Using the DataHawk Small Airborne Measurement System
Publisher: American Meteorological Society
Abstract: he DataHawk small airborne measurement system provides in situ atmospheric measurement capabilities for documenting scales as small as 1 m and can access reasonably large volumes in and above the atmospheric boundary layer ...
The VHF Doppler Radar as a Tool for Cloud and Precipitation Studies
Publisher: American Meteorological Society
Abstract: The VHF Doppler radar has become a powerful tool for probing structures and motions of the clear air. In this paper, we discuss the capability of VHF radar as a tool for cloud and precipitation studies. Large fluctuations ...
The Effects of Critical Layers on Residual Layer Turbulence
Publisher: American Meteorological Society
Abstract: The authors report results of a study of finescale turbulence structure in the portion of the nocturnal boundary layer known as the residual layer (RL). The study covers two nights during the Cooperative Atmosphere?Surface ...
Numerical Modeling of Multiscale Dynamics at a High Reynolds Number: Instabilities, Turbulence, and an Assessment of Ozmidov and Thorpe Scales
Publisher: American Meteorological Society
Abstract: high?Reynolds number direct numerical simulation (DNS) is employed to explore the instability and turbulence dynamics accompanying an idealized multiscale flow that approximates such environments observed throughout the ...
Extreme Gradients in the Nocturnal Boundary Layer: Structure, Evolution, and Potential Causes
Publisher: American Meteorological Society
Abstract: During the Cooperative Atmosphere?Surface Exchange Study-1999 (CASES-99) campaign in southeastern Kansas in the fall of 1999, the University of Colorado's Cooperative Institute for Research in Environmental Sciences (CIRES) ...
Fine Structure, Instabilities, and Turbulence in the Lower Atmosphere: High-Resolution In Situ Slant-Path Measurements with the DataHawk UAV and Comparisons with Numerical Modeling
Publisher: American Meteorological Society
Abstract: AbstractA new platform for high-resolution in situ measurements in the lower troposphere is described and its capabilities are demonstrated. The platform is the small GPS-controlled DataHawk unmanned aerial system (UAS), ...
The Very Stable Boundary Layer on Nights with Weak Low-Level Jets
Publisher: American Meteorological Society
Abstract: The light-wind, clear-sky, very stable boundary layer (vSBL) is characterized by large values of bulk Richardson number. The light winds produce weak shear, turbulence, and mixing, and resulting strong temperature gradients ...