An Automated Analyzer to Measure Surface-Atmosphere Exchange Fluxes of Water Soluble Inorganic Aerosol Compounds and Reactive Trace Gases
Thomas, Rick M.; Trebs, Ivonne; Otjes, René; Jongejan, Piet A. C.; ten Brink, Harry; Phillips, Gavin; Kortner, Michael; Meixner, Franz X.; Nemitz, Eiko. 2009 An Automated Analyzer to Measure Surface-Atmosphere Exchange Fluxes of Water Soluble Inorganic Aerosol Compounds and Reactive Trace Gases. Environmental Science & Technology, 43 (5). 1412-1418. 10.1021/es8019403Full text not available from this repository.
Here, we present a new automated instrument for semicontinuous gradient measurements of water-soluble reactive trace gas species (NH3, HNO3, HONO, HCl, and SO2) and their related aerosol compounds (NH4+, NO3−, Cl−, SO42−). Gas and aerosol samples are collected simultaneously at two heights using rotating wet-annular denuders and steam-jet aerosol collectors, respectively. Online (real-time) analysis using ion chromatography (IC) for anions and flow injection analysis (FIA) for NH4+ and NH3 provide a half-hourly averaged gas and aerosol gradients within each hour. Through the use of syringe pumps, IC preconcentration columns, and high-quality purified water, the system achieves detection limits (3σ-definition) under field conditions of typically: 136/207, 135/114, 29/22, 119/92, and 189/159 ng m−3 for NH3/NH4+, HNO3/NO3−, HONO/NO2−, HCl/Cl− and SO2/SO42−, respectively. The instrument demonstrates very good linearity and accuracy for liquid and selected gas phase calibrations over typical ambient concentration ranges. As shown by examples from field experiments, the instrument provides sufficient precision (3−9%), even at low ambient concentrations, to resolve vertical gradients and calculate surface−atmosphere exchange fluxes under typical meteorological conditions of the atmospheric surface layer using the aerodynamic gradient technique.
|Item Type:||Publication - Article|
|Digital Object Identifier (DOI):||10.1021/es8019403|
|Programmes:||CEH Programmes pre-2009 publications > Biogeochemistry > BG01 Measuring and modelling trace gas, aerosol and carbon|
|Additional Keywords:||Inorganic gases,inorganic aerosol, fluxes, aerodynamic gradient method, ion chromatography|
|NORA Subject Terms:||Meteorology and Climatology
Ecology and Environment
Electronics, Engineering and Technology
|Date made live:||11 May 2009 11:05|
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