The Sensitivityof GPS Precipitable Water Vapor Jumps to Intense Precipitation Associated with Tropical Organized Convective Systems

Autor(es)

Campos, Thamiris B. ; Sapucci, Luiz F. ; Eichholz, Cristiano ; Machado, Luiz A. T. ; Adams, David K.

• Tipo de documento: Artigo Científico
• Fonte: ATMOSPHERE; v. 14, n. 2, p. 18-pg., 2023-02-01.

Resumo

The Global Positioning System (GPS) consists of a constellation of satellites that transmit radio frequency signals to many users with varied applications. For meteorological purposes, the based-ground GPS receivers can provide high-quality column or precipitable water vapor (PWV), as obtained by radiosondes, but with high temporal resolution and low cost. A dense GPS network containing 16 ground-based receivers was installed in Belem city, Brazil, during the period 2-29 June 2011. This network provides a unique opportunity to evaluate the sensitivityof rapid increases in GPS PWV (GPS PWV jumps to the intense precipitation often associated with tropical organized convective systems. Results reveal a characteristic timescale of water vapor convergence before GPS-PWV maximum, which can be used for indicating the occurrence of precipitation associated with organized convective systems. A PWV increase of 4 mm h-1 in a period of an hour or 30 min before the maximum peak GPS-PWV (a peak of at least 57 mm) was observed during organized convection events. The contingency table obtained indicates a probability of detection of 84% and a false alarm ratio of 25% to forecast precipitation events. These results obtained suggest that GPS-PWV jumps can be employed to predict the events associated with organized convection. (AU)

• 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
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• Beneficiário: Luiz Augusto Toledo Machado
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 15/03804-9 - Governança ambiental da macrometrópole paulista face à variabilidade climática
• Beneficiário: Pedro Roberto Jacobi
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 19/12015-9 - Avaliação das simulações dos modelos climáticos sobre o Sudeste do Brasil e das mudanças futuras em um cenário de aquecimento global.
• Beneficiário: Thamiris Luisa de Oliveira Brandão Campos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado