What drives daily precipitation over the central Amazon? Differences observed between wet and dry seasons

Autor(es)

Biscaro, Thiago S. ^[1] ; Machado, Luiz A. T. ^{[2, 1]} ; Giangrande, Scott E. ^[3] ; Jensen, Michael P. ^[3]

Afiliação do(s) autor(es)

^[1] Natl Inst Space Res, Meteorol Satellites & Sensors Div, BR-12630000 Cachoeira Paulista, SP - Brazil

^[2] Max Planck Inst Chem, Multiphase Chem Dept, D-55128 Mainz - Germany

^[3] Brookhaven Natl Lab, Environm & Climate Sci Dept, Upton, NY 11973 - USA

• Tipo de documento: Artigo Científico
• Fonte: Atmospheric Chemistry and Physics; v. 21, n. 9, p. 6735-6754, MAY 5 2021.
• Citações Web of Science: 0

Resumo

This study offers an alternative presentation regarding how diurnal precipitation is modulated by convective events that developed over the central Amazon during the preceding nighttime period. We use data collected during the Observations and Modelling of the Green Ocean Amazon (GoAmazon 2014/2015) field campaign that took place from 1 January 2014 to 30 November 2015 in the central Amazon. Local surface-based observations of cloud occurrence, soil temperature, surface fluxes, and planetary boundary layer characteristics are coupled with satellite data to identify the physical mechanisms that control the diurnal rainfall in central Amazon during the wet and dry seasons. This is accomplished through evaluation of the atmospheric properties during the nocturnal periods preceding raining and non-raining events. Comparisons between these non-raining and raining transitions are presented for the wet (January to April) and dry (June to September) seasons. The results suggest that wet-season diurnal precipitation is modulated by nighttime cloud coverage and local influences such as heating induced turbulence, whereas the dry-season rain events are controlled by large-scale circulations. (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
• 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