WFRF:(Nilsson Monica)
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Emission and dry deposition of accumulation mode particles in the Amazon Basin
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- Ahlm, Lars (author)
- Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM),Stockholm University
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- Krejci, Radovan (author)
- Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM),Stockholm University
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- Nilsson, Douglas (author)
- Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM),Stockholm University
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- Artaxo, Paulo (author)
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- (creator_code:org_t)
- 2010-11-03
- 2010
- English.
- In: Atmospheric Chemistry And Physics. - : Copernicus GmbH. - 1680-7316 .- 1680-7324. ; 10:21, s. 10237-10253
- Journal article (peer-reviewed)
Abstract
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- Size-resolved vertical aerosol number fluxes of particles in the diameter range 0.25–2.5 μm were measured with the eddy covariance method from a 53 m high tower over the Amazon rain forest, 60 km NNW of Manaus, Brazil. This study focuses on data measured during the relatively clean wet season, but a shorter measurement period from the more polluted dry season is used as a comparison. Size-resolved net particle fluxes of the five lowest size bins, representing 0.25–0.45 μm in diameter, pointed downward in more or less all wind sectors in the wet season. This is an indication that the source of primary biogenic aerosol particles may be small in this particle size range. In the diameter range 0.5–2.5 μm, vertical particle fluxes were highly dependent on wind direction. In wind sectors where anthropogenic influence was low, net emission fluxes dominated. However, in wind sectors associated with higher anthropogenic influence, net deposition fluxes dominated. The net emission fluxes were interpreted as primary biogenic aerosol emission, but deposition of anthropogenic particles seems to have masked this emission in wind sectors with higher anthropogenic influence. The emission fluxes were at maximum in the afternoon when the mixed layer is well developed, and these emissions were best correlated with horizontal wind speed by the equation log10F=0.47·U+2.26 where F is the emission number flux of 0.5–2.5 μm particles [m−2s−1] and U is the horizontal wind speed [ms−1] at the top of the tower.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
Keyword
- NATURAL SCIENCES
- NATURVETENSKAP
- Applied Environmental Science
- tillämpad miljövetenskap
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