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SF6, CO and H2 mixing rate since 2000 in vertical profile over Central Amazon

Monica Tais Siqueira D'Amelio, IPEN, monicatais@yahoo.com (Presenting)
Luciana Vanni Gatti, IPEN, lvgatti@ipen.br
John Bharat Miller, NOAA, john.b.miller@noaa.gov
Andrew Crotwell, NOAA, andrew.crotwell@noaa.gov
Lilian Polakiewicz, IPEN, lica_polak@hotmail.com
Elaine A J Martins, IPEN, elaine@ipen.br
Pieter Tans, NOAA, pieter.tans@noaa.gov

Vertical Profiles of Hexafluoride Sulfur (SF6), Carbon Monoxide (CO) and Molecular Hydrogen (H2) mixing rates were studied over undisturbed forest and disturbed area in the Central Amazon at Floresta Nacional do Tapajós (Flona Tapajós), Pará, and at Reserva Biológica de Cuieiras (Cuieiras), Amazonas. Samples from 300 m to 4000 m were developed during Dry and Wet Season since December 2000 at Flona Tapajós, and since December 2004 at Reserva Biológica de Cuieiras. SF6 followed global trend during all studied periods. SF6 vertical profiles were similar with Ascension, due it isn’t produced naturally for the forest. The important observation was 8% higher concentration over Cuieiras than Flona Tapajos indicating different sources of air mass during the Wet Season. CO and H2 presented same different behavior during Dry and Wet Season. At wet season, their values mixing rates were closed of background mixing rates (Ascension Inland), where CO mixing rates show in the average 40 ppb (60%) more than Ascension. During Dry Season their mixing rate were higher in 130ppb (200%) due biomass burning season in Flona Tapajos and 155ppb (215%) in Cuieiras. H2 vertical profile presented tend of sink during the wet seasons and source during dry season, due biomass burning process.

Science Theme:  TG (Trace Gases)

Presentation Type:  Poster

Abstract ID: 117

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