کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4443637 | 1311202 | 2007 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Estimation of the particle and gas scavenging contributions to wet deposition of organic nitrogen
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علم هواشناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We estimated the wet deposition flux of dissolved organic nitrogen (DON) to Tampa Bay, Florida, using 24-h integrated aerosol and rainwater samples collected simultaneously on days with rainfall between July and September 2005. In rainwater, dissolved inorganic nitrogen (DIN) and DON average concentrations were 54.7±44.0 and 4.7±2.7 μM-N, respectively, and DON represented 8.9±5.8% of the total dissolved nitrogen (TDN=DIN+DON). Our estimates of wet deposition fluxes for NH4+, NO3- and DON were 1.40, 3.18 and 0.34 kg-N haâ1 yrâ1, respectively. In aerosols (PM10), DIN and DON concentrations were 78.5±56.2 and 6.3±2.6 nmol mâ3, respectively, and DON represented 10.3±7.3% of TDN. Particle scavenging rates were calculated assuming a lognormal size distribution for particles and lognormal, gamma and Marshall-Palmer size distributions for raindrops. For the range of precipitation rates and measured aerosol concentrations, below-cloud scavenging of aerosol-phase DON contributed only 1±0.7% to rainwater N concentrations. Dimethylamine (DMA) was observed in aqueous extracts of fine (PM2.5) and coarse (PM10â2.5) aerosol samples, but could be quantitatively measured only in fine particles with an average concentration of 688±615 pmol-N mâ3, representing an average contribution of 12.8±6.7% of the total DON concentration measured in the same particle fraction. AIM 2 vapor-liquid equilibrium modeling predicted an average gas-phase DMA concentration of 107.4±176.9 pmol-N mâ3. Although DMA concentrations were below our analytical detection limit on all rainwater samples, the average modeled gas and particle DMA contribution to DON concentration in rainwater was 0.4±0.7%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 41, Issue 20, June 2007, Pages 4281-4290
Journal: Atmospheric Environment - Volume 41, Issue 20, June 2007, Pages 4281-4290
نویسندگان
Silvia M. Calderón, Noreen D. Poor, Scott W. Campbell,