Reactive nitrogen deposition in South America

• Grant number: 12/09934-3
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: September 01, 2012
• End date: March 09, 2016
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Meteorology
• Principal Investigator: Karla Maria Longo de Freitas
• Grantee: Madeleine Sánchez Gácita Casagrande
• Host Institution: Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia e Inovação (Brasil). São José dos Campos , SP, Brazil
• Associated scholarship(s): 13/02101-9 - Contribution of organic aerosols to reactive nitrogen deposition in South America, BE.EP.DR

Abstract

A mapping of the dry and wet deposition of nitrogen species in South America will be performed, aiming an assessment of the modifications in the biogeochemical cycles of the potential affected ecosystems in South America. The use of the 3D atmospheric transport model CCATT-BRAMS "Coupled Chemistry-Aerosol-Tracer Transport model coupled to Brazilian Regional Atmospheric Modelling System" is proposed. This model is able to simulate the emissions, transport and removal processes of gases and aerosols and chemical reactivity in the atmosphere. Several improvements for a better representation of relevant processes in tropical and subtropical regions are already included in the model, such as the parameterization of shallow and deep convection and the plume rising for biomass burning. For the present work, the modeling of dry and wet deposition processes and the aqueous chemistry will be revised to assure the adequate representation of the most relevant processes and reactions for nitrogen species. A database with the measurements of nitrogen deposition and nitrogen budget will be consolidated, including those that will be collected during SAMBBA experiment (The South American Biomass Burning Analysis). The organic fraction of the nitrogen deposition will be addressed in a Research internship abroad (BEPE) project (attached), by means of the study of the relationships between the nitrogen organic fraction as determined in SAMBBA campaign, and the modeling results for the corresponding case of study, in particular the population parameters obtained with the microphysics module MATRIX (Multiconfiguration Aerosol TRacker of mIXing state) recently coupled to CCATT-BRAMS . (AU)

Scientific publications

(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)

GACITA, MADELEINE SANCHEZ; LONGO, KARLA M.; FREIRE, JULLIANA L. M.; FREITAS, SAULO R.; MARTIN, SCOT T.. Impact of mixing state and hygroscopicity on CCN activity of biomass burning aerosol in Amazonia. Atmospheric Chemistry and Physics, v. 17, n. 3, p. 2373-2392, FEB 15 2017. (13/02101-9, 12/13575-9, 12/09934-3, 14/01564-8)