New strategies for retrieving profiles from GNSS radio occultation data considering the Brazilian atmosphere

• Grant number: 21/05285-0
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: November 01, 2021
• End date: October 31, 2025
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geodesy
• Principal Investigator: Daniele Barroca Marra Alves
• Grantee: Gabriel Oliveira Jerez
• Host Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil
• Associated scholarship(s): 22/00276-5 - New methods and strategies for electrons density profiles retrieval from radio occultation for the Brazilian region, BE.EP.PD

Abstract

GNSS (Global Navigation Satellite Systems) Radio Occultation (RO) enables investigations of the Earth's atmosphere. The signals propagated from GNSS satellites to the receivers onboard LEO (Low Earth Orbiting) satellites are influenced by the atmosphere in different ways. From the collected signal it is possible to calculate the refractive index and, with that, retrieve profiles of temperature, pressure, humidity and electron density. Because of its homogeneous distribution, the profiles obtained with RO are especially important when considering scenarios such as the Brazilian atmosphere. Due to its location, in a region of intense ionospheric activity and continental dimensions with the presence of the Amazon forest, which causes significant regional and seasonal variations, Brazil has a complex and dynamic atmosphere. However, in the methods related to the retrieval of atmospheric profiles from RO, some generalizations and specific configuration strategies are used. In general, the strategies adopted consider global characteristics, but aiming improvements in specific scenarios, the use of regional strategies could lead to more realistic results. In this context, the present work aims to investigate and develop methods and strategies for retrieving atmospheric profiles from RO, considering the specificities of the Brazilian atmosphere. Regarding the neutral atmosphere, another intended contribution is the development of a strategy for processing atmospheric profiles that contributes to the identification of extreme events, such as precipitation. From the products obtained with this research, ionospheric models and numerical weather prediction models, which use RO data, may benefit from the inclusion of more accurate profiles. (AU)

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

JEREZ, GABRIEL O.; HERNANDEZ-PAJARES, MANUEL; GOSS, ANDREAS; DA SILVA, CRISLAINE MENEZES; ALVES, DANIELE B. M.; MONICO, JOAO F. G.. Impact and synergies of GIM error estimates on the VTEC interpolation and single-frequency PPP at low latitude region. GPS SOLUTIONS, v. 26, n. 2, APR 2022. (17/50115-0, 21/05285-0)

CHRISTOVAM, ANA L.; PROL, FABRICIO S.; JEREZ, GABRIEL O.; HERNANDEZ-PAJARES, MANUEL; CAMARGO, PAULO O.. PPP at Low Latitudes With Ionospheric Model Exclusively Based on Single Frequency GNSS Measurements. SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS, v. 21, n. 8, p. 13-pg., 2023-08-01. (17/50115-0, 21/05285-0)

JEREZ, GABRIEL O.; HERNANDEZ-PAJARES, MANUEL; GOSS, ANDREAS; PROL, FABRICIO S.; ALVES, DANIELE B. M.; MONICO, JOAO F. G.; SCHMIDT, MICHAEL. Two-Way Assessment of Ionospheric Maps Performance Over the Brazilian Region: Global Versus Regional Products. SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS, v. 21, n. 2, p. 14-pg., 2023-02-01. (17/50115-0, 21/05285-0)

ALVES, D. B. M.; JEREZ, G. O.; NESPOLO, R. S.; HERNANDEZ-PAJARES, M.; MONICO, J. F. G.. IONOSPHERIC IRREGULARITIES MEASURED BY GROUND-BASED AND SATELLITE-EMBEDDED RECEIVERS: ANALYSIS OF S4 INDEX IN A LOW LATITUDE REGION. 39TH INTERNATIONAL SYMPOSIUM ON REMOTE SENSING OF ENVIRONMENT ISRSE-39 FROM HUMAN NEEDS TO SDGS, VOL. 48-M-1, v. N/A, p. 6-pg., 2023-01-01. (21/05285-0, 17/50115-0, 20/09443-6)

ANA LUCIA CHRISTOVAM DE SOUZA; GABRIEL OLIVEIRA JEREZ; PAULO DE OLIVEIRA CAMARGO; DANIELE BARROCA MARRA ALVES. Assessment of GPS positioning performance using different signals in the context of ionospheric scintillation: a month-long case study on São José dos Campos, Brazil. Bol. Ciênc. Geod., v. 28, n. 4, 2022-11-14. (17/50115-0, 21/05285-0)