DOI: 10.1029/2012JD018174
论文题名: Nowcasting severe convective activity over southeast India using ground-based microwave radiometer observations
作者: Madhulatha A. ; Rajeevan M. ; Venkat Ratnam M. ; Bhate J. ; Naidu C.V.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 1 起始页码: 1
结束页码: 13
语种: 英语
英文关键词: microwave radiometer
; nowcasting
; superepoch analysis
; thermodynamic indices
; thunderstorm
Scopus关键词: Microwave devices
; Microwave measurement
; Radiometers
; Radiosondes
; Thermodynamics
; Convective instabilities
; Microwave radiometer observation
; Microwave radiometers
; Nowcasting
; Precipitable water content
; superepoch analysis
; Thermodynamic evolution
; Thermodynamic parameter
; Thunderstorms
; atmospheric convection
; convection
; GPS
; ground-based measurement
; microwave radiometer
; nowcasting
; radiosonde
; thermodynamics
; thunderstorm
; Gadanki
; India
; Tamil Nadu
英文摘要: In the present study, the feasibility of nowcasting convective activity is examined by using thermodynamic indices derived from the ground-based microwave radiometer (MWR) observations located at a tropical station, Gadanki (13.5°N, 79.2°E). There is a good comparison between thermodynamic parameters derived from MWR and colocated GPS radiosonde observations, indicating that MWR observations can be used to develop techniques for nowcasting severe convective activity. Using MWR observations, a nowcasting technique was developed with the data of 26 thunderstorm cases observed at Gadanki. The analysis showed that there are sharp changes in some thermodynamic indices, such as the K index, the humidity index, precipitable water content, the stability index, and equivalent potential temperature lapse rates, about 2-4 h before the occurrence of thunderstorm. A superepoch analysis was made to examine the composite temporal variations of the thermodynamic indices associated with the occurrence of thunderstorms. The superepoch analysis revealed that 2-4 h prior to the storm occurrence, appreciable variations in many parameters are observed, suggesting thermodynamic evolution of the boundary layer convective instability. It is further demonstrated that by monitoring these variations it is possible to predict the ensuing thunderstorm activity over the region at least 2 h in advance. The association between the temporal evolution of thermodynamic indices and convective activity has been tested for the independent case of nine thunderstorms. The present results suggest that ground-based MWR observations can be used effectively to predict the occurrence of thunderstorms at least 2 h in advance. Key Points Validation of radiometer data with radiosonde Corelation between lightning activity and instability indices Nowcasting scheme for severe convection using radiometer data. © 2012 American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63977
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: National Atmospheric Research Laboratory, Gadanki P.O., Chittoor District, Andhra Pradesh 517 112, India; Ministry of Earth Sciences, New Delhi, India; Department of Meteorology and Oceanography, Andhra University, Visakhapatnam, India
Recommended Citation:
Madhulatha A.,Rajeevan M.,Venkat Ratnam M.,et al. Nowcasting severe convective activity over southeast India using ground-based microwave radiometer observations[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(1)