Tropical precipitation studies using a 915‐MHz wind profiler

Precipitation echoes obtained with 915-MHz wind profilers operated in the tropics provide useful information on the structure of precipitating cloud systems. This paper examines the sensitivity of the 915-MHz profiler to precipitation. Observations of precipitation echoes at Manus Island, Papua New Guinea, illustrate profiler performance capabilities for observing several types of tropical convective systems. Special attention is given to the occurrence of deep precipitating clouds which are often present without rain at the surface. Analyses of profiler data from Manus Island show that over a 10-month period, deep precipitating clouds were present more than 25% of the time. The importance of the deep precipitating clouds to the heat budget of the tropical atmosphere is briefly discussed.

[1]  J. Röttger,et al.  Observations of thunderstorm reflectivities and Doppler velocities measured at VHF and UHF , 1987 .

[2]  Susumu Kato,et al.  A Direct Method for Deriving Drop-Size Distribution and Vertical Air Velocities from VHF Doppler Radar Spectra , 1986 .

[3]  D. A. Carter,et al.  Radar reflectivity of the clear air at wavelengths of 5.5 and 33 cm , 1992 .

[4]  V. Ramanathan,et al.  Thermodynamic regulation of ocean warming by cirrus clouds deduced from observations of the 1987 El Niño , 1991, Nature.

[5]  S. Avery,et al.  Combined use of 50 MHz and 915 MHz wind profilers in the estimation of raindrop size distributions , 1992 .

[6]  Warner L. Ecklund,et al.  UHF Wind Profilers: A New Tool for Diagnosing Tropical Convective Cloud Systems , 1994 .

[7]  W. L. Ecklund,et al.  Research Applications of a Boundary-Layer Wind Profiler , 1993 .

[8]  Warner L. Ecklund,et al.  Improved Radio Acoustic Sounding Techniques , 1994 .

[9]  F. Martin Ralph,et al.  Using Radar-Measured Radial Vertical Velocities to Distinguish Precipitation Scattering from Clear-Air Scattering , 1995 .

[10]  Warner L. Ecklund,et al.  Classification of Precipitating Clouds in the Tropics Using 915-MHz Wind Profilers , 1995 .

[11]  Kenneth S. Gage,et al.  Radar Observations of the Free Atmosphere: Structure and Dynamics , 1990 .

[12]  Sergey Y. Matrosov,et al.  Cloud Layers, Particle Identification, and Rain-Rate Profiles from ZRVf Measurements by Clear-Air Doppler Radars , 1992 .

[13]  E. Gossard.  Measuring Drop-Size Distributions in Clouds with a Clear-Air-Sensing Doppler Radar , 1988 .

[14]  Warner L. Ecklund,et al.  Comparison of Raindrop Size Distributions Measured by Radar Wind Profiler and by Airplane , 1993 .

[15]  Warner L. Ecklund,et al.  A UHF Wind Profiler for the Boundary Layer: Brief Description and Initial Results , 1988 .

[16]  Sergey Y. Matrosov,et al.  Radar reflectivity in snowfall , 1992, IEEE Trans. Geosci. Remote. Sens..

[17]  Warner L. Ecklund,et al.  Field tests of a lower tropospheric wind profiler , 1990 .

[18]  D. A. Carter,et al.  First Test of a Shipboard Wind Profiler , 1992 .

[19]  D. A. Carter,et al.  Wind profiler‐related research in the tropical Pacific , 1991 .

[20]  T. Ackerman,et al.  Heating rates in tropical anvils , 1988 .

[21]  K. Moran,et al.  The Colorado Wind-Profiling Network , 1984 .

[22]  David A. Carter,et al.  The Integrated Sounding System: Description and Preliminary Observations from TOGA COARE , 1994 .