کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8863510 | 1620284 | 2018 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Size-resolved aerosol fluxes above a temperate broadleaf forest
ترجمه فارسی عنوان
فلوئورسورهای حجمی حلقوی بیش از یک جنگل وسیعی است
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علم هواشناسی
چکیده انگلیسی
Aerosol fluxes were measured by eddy-correlation for 8 weeks of the summer and fall of 2011 above a temperate broadleaf forest in central Ontario, Canada. These size-resolved measurements apply to particles with optical diameters between 50 and 500â¯nm and are the first ones reported above a temperate deciduous forest. The particle spectrometer was located on top of the flux tower in order to reduce signal dampening in the tube and thus maximize measurement efficiency. The 8-week data set extends into autumn, capturing leaf senescence and loss, offering a rare opportunity to investigate the influence of leaf area index on particle transfer. A distinct pattern of emission and deposition that depends on the particle size is highlighted: while the smallest particles (dpâ¯<â¯100â¯nm) are preferentially emitted (55% of the time), the largest particles (dp > 100 nm) are preferentially deposited (62% of the time). For the size bins with detection efficiency above 50% (68-292 nm), the median transfer velocity for each bin varies between +1.34 and â2.69 mm sâ1 and is equal to â0.21â¯mmâ¯sâ1 for the total particle count. The occurrence of the upward fluxes shows a marked diurnal pattern. Possible explanations for these upward fluxes are proposed. The measurements, and their comparison with an existing model, highlight some of the key drivers of the particle transfer onto a broadleaf forest: particle size, friction velocity, leaf area index and atmospheric stability.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 190, October 2018, Pages 359-375
Journal: Atmospheric Environment - Volume 190, October 2018, Pages 359-375
نویسندگان
A. Petroff, J.G. Murphy, S.C. Thomas, J.A. Geddes,