Evidence of aqueous secondary organic aerosol formation from biogenic emissions in the North American Sonoran Desert
Identifieur interne : 000265 ( Main/Exploration ); précédent : 000264; suivant : 000266Evidence of aqueous secondary organic aerosol formation from biogenic emissions in the North American Sonoran Desert
Auteurs : Jong-Sang Youn [États-Unis] ; Zhen Wang [États-Unis] ; Anna Wonaschütz [Autriche] ; Avelino Arellano [États-Unis] ; Eric A. Betterton [États-Unis] ; Armin Sorooshian [États-Unis]Source :
- Geophysical research letters [ 0094-8276 ] ; 2013.
Abstract
This study examines the role of aqueous secondary organic aerosol formation in the North American Sonoran Desert as a result of intense solar radiation, enhanced moisture, and biogenic volatile organic compounds (BVOCs). The ratio of water-soluble organic carbon (WSOC) to organic carbon (OC) nearly doubles during the monsoon season relative to other seasons of the year. When normalized by mixing height, the WSOC enhancement during monsoon months relative to preceding dry months (May–June) exceeds that of sulfate by nearly a factor of 10. WSOC:OC and WSOC are most strongly correlated with moisture parameters, temperature, and concentrations of O3 and BVOCs. No positive relationship was identified between WSOC or WSOC:OC and anthropogenic tracers such as CO over a full year. This study points at the need for further work to understand the effect of BVOCs and moisture in altering aerosol properties in understudied desert regions.
Url:
DOI: 10.1002/grl.50644
PubMed: 24115805
PubMed Central: 3792583
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en"><p id="P1">This study examines the role of aqueous secondary organic aerosol formation in the North American Sonoran Desert as a result of intense solar radiation, enhanced moisture, and biogenic volatile organic compounds (BVOCs). The ratio of water-soluble organic carbon (WSOC) to organic carbon (OC) nearly doubles during the monsoon season relative to other seasons of the year. When normalized by mixing height, the WSOC enhancement during monsoon months relative to preceding dry months (May–June) exceeds that of sulfate by nearly a factor of 10. WSOC:OC and WSOC are most strongly correlated with moisture parameters, temperature, and concentrations of O<sub>3</sub>
and BVOCs. No positive relationship was identified between WSOC or WSOC:OC and anthropogenic tracers such as CO over a full year. This study points at the need for further work to understand the effect of BVOCs and moisture in altering aerosol properties in understudied desert regions.</p>
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