کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4426856 1309137 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Particle fluxes above forests: Observations, methodological considerations and method comparisons
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Particle fluxes above forests: Observations, methodological considerations and method comparisons
چکیده انگلیسی

This paper reports a study designed to test, evaluate and compare micro-meteorological methods for determining the particle number flux above forest canopies. Half-hour average particle number fluxes above a representative broad-leaved forest in Denmark derived using eddy covariance range from −7 × 107 m−2 s−1 (1st percentile) to 5 × 107 m−2 s−1 (99th percentile), and have a median value of −1.6 × 106 m−2 s−1. The statistical uncertainties associated with the particle number flux estimates are larger than those for momentum fluxes and imply that in this data set approximately half of the particle number fluxes are not statistically different to zero. Particle number fluxes from relaxed eddy accumulation (REA) and eddy covariance are highly correlated and of almost identical magnitude. Flux estimates from the co-spectral and dissipation methods are also correlated with those from eddy covariance but exhibit higher absolute magnitude of fluxes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 152, Issue 3, April 2008, Pages 667–678
نویسندگان
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