In:
Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 19, No. 16 ( 2019-08-29), p. 11013-11030
Abstract:
Abstract. The primary sugar compounds (SCs, defined as glucose,
arabitol, and mannitol) are widely recognized as suitable molecular markers
to characterize and apportion primary biogenic organic aerosol emission
sources. This work improves our understanding of the spatial behavior and
distribution of these chemical species and evidences their major effective
environmental drivers. We conducted a large study focusing on the daily (24 h) PM10 SC concentrations for 16 increasing space scale sites (local to nationwide), over at least 1 complete year. These sites are distributed
in several French geographic areas of different environmental conditions.
Our analyses, mainly based on the examination of the short-term evolutions
of SC concentrations, clearly show distance-dependent correlations. SC
concentration evolutions are highly synchronous at an urban city scale and
remain well correlated throughout the same geographic regions, even if the
sites are situated in different cities. However, sampling sites located in
two distinct geographic areas are poorly correlated. Such a pattern indicates
that the processes responsible for the evolution of the atmospheric SC
concentrations present a spatial homogeneity over typical areas of at least
tens of kilometers. Local phenomena, such as the resuspension of topsoil and
associated microbiota, do no account for the major emissions processes of SC in urban areas not directly influenced by agricultural activities. The
concentrations of SC and cellulose display remarkably synchronous temporal
evolution cycles at an urban site in Grenoble, indicating a common source
ascribed to vegetation. Additionally, higher concentrations of SC at another site located in a crop field region occur during each harvest periods, indicating resuspension processes of plant materials (crop detritus, leaf debris) and associated microbiota for agricultural and nearby urbanized areas. Finally, ambient air temperature, relative humidity, and vegetation density constitute the main effective drivers of SC atmospheric concentrations.
Type of Medium:
Online Resource
ISSN:
1680-7324
DOI:
10.5194/acp-19-11013-2019
DOI:
10.5194/acp-19-11013-2019-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2019
detail.hit.zdb_id:
2092549-9
detail.hit.zdb_id:
2069847-1
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