Effects of spatial heterogeneity of leaf density and crown spacing of canopy patches on dry deposition rates
Effects of spatial heterogeneity of leaf density and crown spacing of canopy patches on dry deposition rates
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冠层斑块叶密度和冠距空间异质性对干沉降率的影响
DOI：
10.1016/j.agrformet.2021.108440
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发表时间：
2021
影响因子：
6.2
通讯作者：
Bakshi, Bhavik
中科院分区：
文献类型：
--
作者：
Yazbeck, Theresia;Bohrer, Gil;Vines, Chante';De Roo, Frederik;Mauder, Matthias;Bakshi, Bhavik
树木在改善城市空气质量方面发挥着重要作用，除其他机制外，还通过在树叶表面干沉积标量和气溶胶。我们测试了叶密度和冠层结构在调节干沉降速率中的作用。本文利用大涡模拟模型（PALM）模拟了虚拟森林斑块与任意尺度沉积速率之间的相互作用。两种冠层结构被认为是：一个同质的冠层和冠层条纹。对于每一种林冠条纹方案，我们考虑了薄的、中间的和宽的条纹，而条纹之间的空间等于条纹的宽度。每种情况下考虑四种叶面积密度（LAI = 0.5，1，1.5和2）。结果表明，密集的冠层和冠层条纹经历了更多的总沉积，注意到条纹有更大的单位叶面积沉积比均匀的冠层。我们的研究结果可以解释冠层引起的湍流结构，耦合的空气内和冠层上方，并导致更有效的叶面积，这种耦合是强大的。我们汇总我们的结果，以整个补丁规模，并建议冠层结构和叶面积相关的冠层阻力参数的校正，以便用于解决干沉降的粗糙模型。
Trees have a large role in improving urban air quality, among other mechanisms, through dry deposition of scalars and aerosols on leaf surfaces. We tested the role of leaf density and canopy structure in modulating the rate of dry deposition. We simulated the interactions between a virtual forest patch and deposition rate of an arbitrary scalar using the Parallelized Large Eddy Simulation Model (PALM). Two canopy structures were considered: a homogenous canopy and canopy stripes. For each canopy stripe scenario, we considered thin, intermediate, and wide stripes, while the space between stripes equals the stripes’ width. Four leaf area densities were considered for each case (LAI = 0.5, 1, 1.5, and 2). The results showed that denser canopies and canopy stripes experienced more total deposition, noting that stripes had a larger per leaf area deposition than homogeneous canopies. Our results can be explained by canopy-induced turbulence structures that couple the air within and above the canopy and lead to more effective leaf area where this coupling is stronger. We aggregate our results to the whole-patch scale and suggest a canopy-structure and leaf-area dependent correction to the canopy resistance parameter so to be used in coarse models that resolve dry deposition.
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DOI：
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发表时间：
1966
期刊：
影响因子：
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DOI：
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影响因子：
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作者：
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DOI：
--
发表时间：
2004
期刊：
影响因子：
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作者：
K. Ridder;J. Neirynck;C. Mensink
通讯作者：
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