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Nitrogen in South America

Nitrogen in South America. Nitrogen Cycling In Latin America: Drivers, Impacts And Vulnerabilities ( Nnet ) IAI 2013-2018: continent

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Nitrogen in South America

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  1. Nitrogen in South America Nitrogen Cycling In Latin America: Drivers, Impacts And Vulnerabilities (Nnet) IAI 2013-2018: continent Atmosphere chemical characteristics determination of different environments in the São Paulo State: a reactive nitrogen species deposition study. (SAAD) FAPESP 2012-2014: regional-

  2. Nnet • Broad integrative network of research and outreach across multiple ecoregions and socioeconomic backgrounds in Latin America: Nitrogen Human Environment Network (Nnet). • Examine human impact in natural and modified ecosystems across a wide range of climates, ranging from direct measurements to regional modeling exercises.

  3. (i) inputs: Natural-BNF and cultivation induced-BNF, fertilizer use, atmospheric deposition; • (ii) Outputs: Net exports of agricultural products at regional level and estimates at site scale of gaseous emissions from land use (fertilizer volatilization, biogenic soil emissions and burning), export of N to groundwater and surface waste (domestic, agricultural and industrial) and via nitrification and denitrification.

  4. GOALS • Implement a Latin American network of research groups allowing to address various aspects of the N cycle in a complementary design; • Identify, integrate and synthesize the current and acquired knowledge of the Latin America N cycle, particularly as related to land use and land use change; • Reduce the uncertainties of Latin America’s regional N budget and contribute to the current constraints of global estimates constraints in global estimates; • Contribute to the development of a regional atmospheric chemistry transport model suitable to simulate the atmospheric component of N cycle. • Summarize the current state of nitrogen science in Latin America, to provide summary information for the development of environmentally sustainable public policies that can be used to educate a broad audience. • Be part of selected Global observation networks such as those supported by National Atmospheric Deposition Program (NADP), World Meteorological Organization (WMO) and International Biosphere GeosphereProgramme (IGBP) programs.

  5. SAAD • Scientific question: concentration and deposition determination of reactive nitrogen into the atmosphere of some regions of the State of São Paulo. • Atmospheric deposition:diverse atmospheric characteristics in the State of São Paulo; • Use a low-cost sampling system and opening the possibility of replicate the established model for other regions (Sutton, 2001).

  6. GOALS • Build, calibrate, validate a system based on diffusion tubes (denuders) . DELTA (DEnuder for Long-Term Atmospheric sampling (Sutton, 2001) • Determine the cations, anions total C and N in aqueous extract of the particulate matter, denuders and rainfall; • To calculate de deposition based on conceptual model for the region; • Implement a logistic system for large scale studies.

  7. 1: Cunha; 2: Cachoeira Paulista; 3: São José dos Campos; 4:São Paulo; 5: São Carlos; 6: Assis e 7: Teodoro Sampaio

  8. Wet only collector: need calibration against a established one

  9. DELTA (SAAD) System

  10. Chemical analyses: • Anions and Cations: IC (Metrohm Professional 860) • N and C: TOC-N • NH4+ (FIA - manual) limited analitical capacity

  11. Site for GAW sampling

  12. THANK YOU

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