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  • Author or Editor: S. T. Shipley x
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K. E. Kunkel
,
E. W. Eloranta
, and
S. T. Shipley

Abstract

A scanning lidar system has been used to observe convection in the atmospheric boundary layer. In particular, cell sizes and geometry have been determined and circulation patterns in and around the cells have been measured.

The lidar data show that the preferred form of convective cells are plumes with roots near the surface. The majority of these plumes have aspects ratios between 0.5 and 1.5. The measurements of circulation patterns show the strongest rising motion on the upwind side of the cell with sinking motion on the downwind side. These observations show that lidar is a powerful tool for observing convection.

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S. T. Shipley
,
E. W. Eloranta
, and
J. A. Weinman

Abstract

Monostatic lidar is explored as a means for determining the rainfall rate over an extended atmospheric path with a spatial resolution comparable to that of rain gages. An empirical relationship is established between the optical extinction coefficient of rain β r (km−1) and the rainfall rate R (mm hr−1). Correlation of lidar-derived rainfall extinction and gage rainfall rates at Madison gives
β r R0.74
.

The β r -R relations obtained from the work of other authors compare well with this relationship.

A lidar equation which accounts for the multiple scattering of light in rain is presented. A numerical procedure which derives estimates of β r as a function of range from lidar returns is developed. Examples of lidar-derived rainfall rate range profiles in spatially inhomogeneous thunderstorms are given.

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