Classification of Tropical Precipitating Systems Using Wind Profiler Spectral Moments. Part I: Algorithm Description and ValidationSource: Journal of Atmospheric and Oceanic Technology:;2008:;volume( 025 ):;issue: 006::page 884Author:Rao, T. Narayana
,
Kirankumar, N. V. P.
,
Radhakrishna, B.
,
Rao, D. Narayana
,
Nakamura, K.
DOI: 10.1175/2007JTECHA1031.1Publisher: American Meteorological Society
Abstract: The lower atmospheric wind profiler (LAWP) measurements made at Gadanki, India, have been used to develop an objective algorithm to classify the tropical precipitating systems. A detailed investigation on the existing classification scheme reveals major shortcomings in the scheme. In the present study, it is shown with examples that the Doppler velocity gradient (DVG) criterion is a necessary but certainly not a sufficient condition to identify the radar bright band. Such gradients in Doppler velocity can exist in other types of rain systems, for example, in convection, due to the modulation of Doppler velocity of hydrometeors by vertical air motion. The approach of the new classification scheme deviates considerably from that of existing algorithms. For instance, the new algorithm, in contrast to identifying the stratiform rain and assuming the remaining rain as convection, identifies first convection and later stratiform precipitation based on their specific characteristics. The other interesting feature in this algorithm is that it was built on the strengths of other potential classification schemes and theoretically accepted thresholds for classification of the precipitation. The performance of the new algorithm has been verified with the help of time?height maps of profiler moments and corresponding surface rainfall patterns.
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contributor author | Rao, T. Narayana | |
contributor author | Kirankumar, N. V. P. | |
contributor author | Radhakrishna, B. | |
contributor author | Rao, D. Narayana | |
contributor author | Nakamura, K. | |
date accessioned | 2017-06-09T16:20:30Z | |
date available | 2017-06-09T16:20:30Z | |
date copyright | 2008/06/01 | |
date issued | 2008 | |
identifier issn | 0739-0572 | |
identifier other | ams-66089.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4207386 | |
description abstract | The lower atmospheric wind profiler (LAWP) measurements made at Gadanki, India, have been used to develop an objective algorithm to classify the tropical precipitating systems. A detailed investigation on the existing classification scheme reveals major shortcomings in the scheme. In the present study, it is shown with examples that the Doppler velocity gradient (DVG) criterion is a necessary but certainly not a sufficient condition to identify the radar bright band. Such gradients in Doppler velocity can exist in other types of rain systems, for example, in convection, due to the modulation of Doppler velocity of hydrometeors by vertical air motion. The approach of the new classification scheme deviates considerably from that of existing algorithms. For instance, the new algorithm, in contrast to identifying the stratiform rain and assuming the remaining rain as convection, identifies first convection and later stratiform precipitation based on their specific characteristics. The other interesting feature in this algorithm is that it was built on the strengths of other potential classification schemes and theoretically accepted thresholds for classification of the precipitation. The performance of the new algorithm has been verified with the help of time?height maps of profiler moments and corresponding surface rainfall patterns. | |
publisher | American Meteorological Society | |
title | Classification of Tropical Precipitating Systems Using Wind Profiler Spectral Moments. Part I: Algorithm Description and Validation | |
type | Journal Paper | |
journal volume | 25 | |
journal issue | 6 | |
journal title | Journal of Atmospheric and Oceanic Technology | |
identifier doi | 10.1175/2007JTECHA1031.1 | |
journal fristpage | 884 | |
journal lastpage | 897 | |
tree | Journal of Atmospheric and Oceanic Technology:;2008:;volume( 025 ):;issue: 006 | |
contenttype | Fulltext |