| Full text | |
| Author(s): |
Campos, Thamiris B.
;
Sapucci, Luiz F.
;
Eichholz, Cristiano
;
Machado, Luiz A. T.
;
Adams, David K.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | ATMOSPHERE; v. 14, n. 2, p. 18-pg., 2023-02-01. |
| Abstract | |
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) | |
| 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 Opportunities: | 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 Opportunities: | Research Program on Global Climate Change - Thematic Grants |
| FAPESP's process: | 15/03804-9 - Environmental governance of macrometropolis paulista in face of climate variability |
| Grantee: | Pedro Roberto Jacobi |
| Support Opportunities: | Research Program on Global Climate Change - Thematic Grants |
| FAPESP's process: | 19/12015-9 - Evaluation of simulations of climate models on Southeastern Brazil and future changes in a global warming scenario |
| Grantee: | Thamiris Luisa de Oliveira Brandão Campos |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |