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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Global Positioning System precipitable water vapour (GPS-PWV) jumps before intense rain events: A potential application to nowcasting

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Author(s):
Sapucci, Luiz F. [1] ; Machado, Luiz A. T. [1] ; de Souza, Eniuce Menezes [2] ; Campos, Thamiris B. [3]
Total Authors: 4
Affiliation:
[1] Inst Nacl Pesquisas Espaciais, Ctr Previsao Tempo & Estudos Climat, Cachoeira, Paulista - Brazil
[2] Univ Estadual Maringa, Dept Estat, Maringa, Parana - Brazil
[3] Inst Nacl Pesquisas Espaciais, Programa Posgrad Meteorol, Sao Jose Dos Campos - Brazil
Total Affiliations: 3
Document type: Journal article
Source: METEOROLOGICAL APPLICATIONS; v. 26, n. 1, p. 49-63, JAN 2019.
Web of Science Citations: 0
Abstract

A rapid increase in atmospheric water vapour is a fundamental ingredient for many intense rainfall events. High-frequency precipitable water vapour (PWV) estimates (1 min) from a Global Positioning System (GPS) meteorological site are evaluated in this paper for intense rainfall events during the CHUVA Vale field campaign in Brazil (November and December 2011) in which precipitation events of differing intensities and spatial dimensions, as observed by an X-band radar, were explored. A sharp increase in the GPS-PWV before the more intense events was found and termed GPS-PWV jumps. These jumps are probably associated with water vapour convergence and the continued formation of cloud condensate and precipitation particles. A wavelet correlation analysis between the high temporal-resolution GPS-PWV time series and rainfall events evaluated in this study shows that there are oscillations in the PWV time series correlated with the more intense rainfall events. These oscillations are on scales related to periods from about 32 to 64min (associated with GPS-PWV jumps) and from 16 to 34min (associated with positive pulses of the PWV). The GPS-PWV time-derivative histogram for the time window before the rainfall event reveals different distributions influenced by positive pulses of the GPS-PWV (derivative > 9.5mm/hr) for higher intensity and extension events. These features are indicative of the occurrence of intense precipitation and, consequently, have the potential for application in nowcasting activities. (AU)

FAPESP's process: 09/15235-8 - Cloud processes of the main precipitation systems in Brazil: a contribution to cloud resolving modeling and to the GPM (Global Precipitation Measurement)
Grantee:Luiz Augusto Toledo Machado
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/14497-0 - Nowcasting of intense thunderstorms and understanding of the physical processes inside clouds: the SOS-CHUVA (Severe Weather Observation System)
Grantee:Luiz Augusto Toledo Machado
Support type: Research Program on Global Climate Change - Thematic Grants