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Nitrous oxide mixing ratio during dry and wet seasons in vertical profile over the central Amazon

Monica Tais Siqueira D'Amelio, IPEN, (Presenting)
Luciana Vanni Gatti, IPEN,
John Bharat Miller, NOAA,
Andrew Crotwell, NOAA,
Lilian Polakiewicz, IPEN,
Elaine A J Martins, IPEN,
Pieter Tans, NOAA,

Vertical Profiles of nitrous oxide (N2O) have been measured above central Amazônia, on undisturbed forest and disturbed area at Floresta Nacional do Tapajós (Flona Tapajós), Pará state and at Reserva Biológica de Cuieiras (Cuieiras), Amazonas state. Samples are collected aboard light aircraft between the surfaces (300 m) until 4000 m, using the NOAA/CMDL semi-automatic portable flask package (PFP). The PFP consists of 17 glass flasks with 700 mL volume that are pressurized to about 3 bar to enable measurements of all the gases mentioned above. These studies were made since 2000 at Flona Tapajós, and since 2004 at Reserva Biológica de Cuieiras. Comparing N2O mixing rates over Central Amazon and remote place over South Atlantic Ocean, we noted Central Amazon agrees to global trend until 2003. After this, we observed enhancement in N2O concentration due fertilization in agricultural activities. The wet season for 2004 and 2005 shows 1 ppb more than Dry Season at Flona Tapajós for all profile, after subtracted global influence. Besides the N fertilization that occurs during this season, the contribution during the dry season is biomass burning.

Science Theme:  TG (Trace Gases)

Session:  2C: Trace Gases and Aerosols

Presentation Type:  Oral

Abstract ID: 116

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