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Aerodynamic gradient measurements of the NH3-HNO3-NH4NO3 triad using a wet chemical instrument : an analysis of precision requirements and flux errors

Title data

Wolff, Veronika ; Trebs, Ivonne ; Ammann, Christof ; Meixner, Franz X.:
Aerodynamic gradient measurements of the NH3-HNO3-NH4NO3 triad using a wet chemical instrument : an analysis of precision requirements and flux errors.
In: Atmospheric Measurement Techniques. Vol. 3 (2010) Issue 1 . - pp. 187-208.
ISSN 1867-8548
DOI: https://doi.org/10.5194/amt-3-187-2010

Abstract in another language

The aerodynamic gradient method is widely used for flux measurements of ammonia, nitric acid, particulate ammonium nitrate (the NH3-HNO3-NH4NO3 triad)and other water-soluble reactive trace compounds. The surface exchange flux is derived from a measured concentration difference and micrometeorological quantities (turbulent exchange coefficient). The significance of the measured concentration difference is crucial for the significant determination of surface exchange fluxes. Additionally, measurementsof surface exchange fluxes of ammonia, nitric acid and ammoniumnitrate are often strongly affected by phase changes between gaseous and particulate compounds of the triad, which make measurements of the four individual species (NH3, HNO3, NH+4 , NO−3) necessary for a correct interpretation of the measured concentration differences.We present here a rigorous analysis of results obtainedwith a multi-component, wet-chemical instrument, able to simultaneously measure gradients of both gaseous and particulatetrace substances. Basis for our analysis are two field experiments,conducted above contrasting ecosystems (grassland, forest). Precision requirements of the instrument as well as errors of concentration differences and micrometeorological exchange parameters have been estimated, which, in turn, allows the establishment of thorough error estimates of the derived fluxes of NH3, HNO3, NH+4 , and NO−3 . Derived median flux errors for the grassland and forest fieldexperiments were: 39% and 50% (NH3), 31% and 38% (HNO3), 62% and 57% (NH+4 ), and 47% and 68% (NO−3 ), respectively. Additionally, we provide the basis for using field data to characterize the instrument performance, as well as subsequent quantification of surface exchange fluxes and underlying mechanistic processes under realistic ambient measurement conditions.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER79544
Institutions of the University: Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 07 Aug 2015 06:59
Last Modified: 07 Aug 2015 06:59
URI: https://eref.uni-bayreuth.de/id/eprint/17713