A note on aerosol sized particle deposition onto dense and tall canopies situated on gentle cosine hills

作者：Katul Gabriel G^*; Poggi Davide

来源：Tellus Series B-Chemical and Physical Meteorology, 2011, 63(3): 395-400.

DOI：10.1111/j.1600-0889.2011.00528.x

Micrometeorological measurements of aerosol sized dry particle deposition velocity (V(d)) onto forested canopies have significantly advanced over the past two decades and now include both-airborne and stationary platforms. However, the interpretation of these V(d) measurements still relies on stationary and planar homogeneous flow assumptions only appropriate to flat-terrain conditions. Simplified model calculations were used to examine how variations in hill height (H) introduce biases in V(d) when assumptions appropriate to flat terrain are applied to periodic and gentle 2-D cosine topography covered with tall and dense forested canopies. It was shown that increasing H reduced the variability in V(d) for all aerosol sized particle diameters (d(p)) inside the canopy when the hill slope (H/L) remained constant (=0.1), where L is the cosine hill half-length. At the landscape scale, as may be monitored from airborne platforms, assumptions appropriate to flat-terrain appear accurate with increasing H for a constant and gentle H/L (=0.1). Inside the canopy, variability in V(d) tends to be larger than above the canopy for all H values and d(p) classes.

• 出版日期2011-7