Size and composition resolved aerosol fluxes above a pine forest and their response to biogenic chemistry

Nemitz, Eiko; Huffmann, Alex; Jimenez, Jose; Baker, Brad; Walker, John T.; Delia, Alice; Toohey, Darin; Karl, Thomas; Stroud, Craig; Guenther, Alex. 2009 Size and composition resolved aerosol fluxes above a pine forest and their response to biogenic chemistry. [Lecture] In: Proceedings of the International Conference of “Atmospheric Transport and Chemistry in Forest Ecosystems”, Castle of Thurnau, Germany, 5-8 Oct 2009. University of Bayreuth, Germany, 8.

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Fluxes of aerosols were measured above a loblolly pine plantation at Duke Forest, North Carolina, during the CELTIC campaign (Chemical Emission, Loss, Transformation, and Interactions with Canopies). Measurements were made by eddy covariance for total number fluxes (using two condensation particle counters with different cut-offs), size-segregated particle fluxes (using an optical particle spectrometer) and for individual sub-micron aerosol components by aerosol mass spectrometry (AMS). The fluxes of particle numbers, sulphate and organic components show bi-directional behaviour with consistent diurnal patterns, while nitrate was always deposited. The reasons for the bi-directional behaviour are discussed, and the measurements are used to estimate particle growth rates due to vapour uptake that would be consistent with the observations. Aerosol measurements are integrated with measurements of biogenic volatile organic compounds (BVOCs) at different scales (branch emissions, in-canopy gradients and canopy scale fluxes). The measurements demonstrate that organic emissions during midday are linked to the peak in plant emissions and photo-chemistry, and point to a yet unidentified source of reactive sulphur compounds in the forest canopy.

Item Type: Publication - Conference Item (Lecture)
Programmes: CEH Topics & Objectives 2009 - 2012 > Biodiversity > BD Topic 2 - Ecological Processes in the Environment > BD - 2.1 - Interactions ... structure ecosystems and their functioning
UKCEH and CEH Sections/Science Areas: Billett (to November 2013)
NORA Subject Terms: Atmospheric Sciences
Related URLs:
Date made live: 18 Jan 2010 13:54 +0 (UTC)

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