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

Autor(es)

Sapucci, Luiz F. ^[1] ; Machado, Luiz A. T. ^[1] ; de Souza, Eniuce Menezes ^[2] ; Campos, Thamiris B. ^[3]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: METEOROLOGICAL APPLICATIONS; v. 26, n. 1, p. 49-63, JAN 2019.
• Citações Web of Science: 1

Resumo

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)

• Processo FAPESP: 15/14497-0 - Previsão imediata de tempestades intensas e entendimento dos processos físicos no interior das nuvens: o SOS-CHUVA (Sistema de Observação e Previsão de Tempo Severo)
• Beneficiário: Luiz Augusto Toledo Machado
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 09/15235-8 - Processos de nuvens associados aos principais sistemas precipitantes no Brasil: uma contribuição à modelagem da escala de nuvens e ao GPM (Medida Global de Precipitação)
• Beneficiário: Luiz Augusto Toledo Machado
• Modalidade de apoio: Auxílio à Pesquisa - Temático