Share Email Print
cover

Proceedings Paper

Analysis of echo characteristics of Doppler velocity in a rainstorm event
Author(s): Jiangjin Lu; Fengqi Zhang; Zhihong Jiang; Yan Wang; Lirong Wang
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Doppler radar, when used in detecting large-scale intense precipitation, has its echo features differing than those from warm or cold advection alone (as an S- or anti-S- form) and than those just from large-scale convergence or divergence (as a bow-like shape) but the features of Doppler velocity resulting from the combination of warm or cold advection with convergence or divergence are called the complex windfield. Analysis of Doppler weather radar data from an extensive, persistent strong rainfall event over the Hai river basin on August 16, 2005 reveals that 1) in the presence of a low-level complex windfield related to the combination of warm advection and convergence, i.e., the Doppler velocity products show that, starting from the radar center, clockwise curvature of a zero-speed line on one side toward the positive velocity zone is more remarkable than the counterpart on the other side towards the negative velocity zone, implying that when the negative speed zone is bigger compared to the maximum positive area, rainfall is reinforced or maintained; 2) in the presence of a low-level complex windfield resulting from warm advection combined with divergence, the precipitation would be weakened or ceased. Therefore, the study on the convergence and divergence in the radar velocity field gives a good indicator of nowcasting prediction of the formation, development, maintenance and decay phases of a large-scale rainfall event.

Paper Details

Date Published: 1 September 2006
PDF: 7 pages
Proc. SPIE 6301, Atmospheric and Environmental Remote Sensing Data Processing and Utilization II: Perspective on Calibration/Validation Initiatives and Strategies, 63010V (1 September 2006); doi: 10.1117/12.679273
Show Author Affiliations
Jiangjin Lu, Nanjing Univ. of Information Science and Technology (China)
Tianjin Meteorological Bureau (China)
Fengqi Zhang, Nanjing Univ. of Information Science and Technology (China)
Weihai Meteorological Bureau of Shandong (China)
Zhihong Jiang, Nanjing Univ. of Information Science and Technology (China)
Yan Wang, Tianjin Meteorological Bureau (China)
Lirong Wang, Shijiazhuang Meteorological Bureau of Hebei (China)


Published in SPIE Proceedings Vol. 6301:
Atmospheric and Environmental Remote Sensing Data Processing and Utilization II: Perspective on Calibration/Validation Initiatives and Strategies
Allen H. L. Huang; Hal J. Bloom, Editor(s)

© SPIE. Terms of Use
Back to Top