NDLI: GPS-PWV jumps before intense rain events

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GPS-PWV jumps before intense rain events

Content Provider	Scilit
Author	Sapucci, Luiz F. Machado, Luiz A. T. de Souza, Eniuce Menezes Campos, Thamiris B.
Copyright Year	2016
Description	A rapid increase in atmospheric water vapor is a fundamental ingredient for many intense rainfall events. High-frequency precipitable water vapor (PWV) estimates from a Global Positioning System meteorological site (GPS) are evaluated here for intense rainfall events during the CHUVA Vale field campaign in Brazil (November–December 2011), in which precipitation events of differing intensities and spatial dimensions, as observed by an X-band radar, have been explored. A wavelet cross-correlation analysis shows that there are important spikes in the PWV that precede the more intense rainfall events on a timescale from 30 to 60 minutes. The correlation and lags between the GPS-PWV and rainfall events are evaluated, and a sharp increase in the GPS-PWV prior to the more intense events has been found and termed GPS-PWV "jumps". These jumps are associated with water vapor convergence and the continued formation of cloud condensate and precipitation particles. The GPS-PWV time-derivative histogram for the period of 60 minutes before the rainfall event reveals different distributions for higher intensity events. This feature could indicate the occurrence of severe precipitation and consequently has the potential for application in nowcasting activities.
e-ISSN	18678610
DOI	10.5194/amt-2016-378
Alternate Webpage(s)	https://www.atmos-meas-tech-discuss.net/amt-2016-378/amt-2016-378.pdf
Journal	Atmospheric Measurement Techniques Discussions
Volume Number	2016
Language	English
Publisher	Copernicus GmbH
Publisher Date	2016-11-28
Access Restriction	Open
Subject Keyword	Atmospheric Sciences Water Vapor Rainfall Events Gps Pwv
Content Type	Text
Resource Type	Article

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