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- Title
Classification of Vertical Wind Speed Profiles Observed Above a Sloping Forest at Nighttime Using the Bulk Richardson Number.
- Authors
Komatsu, Hikaru; Hotta, Norifumi; Kuraji, Koichiro; Suzuki, Masakazu; Oki, Taikan
- Abstract
Wind speed profiles above a forest canopy relate to scalar exchange between the forest canopy and the atmosphere. Many studies have reported that vertical wind speed profiles above a relatively flat forest can be classified by a stability index developed assuming wind flow above a flat plane. However, can such a stability index be used to classify vertical wind speed profiles observed above a sloping forest at nighttime, where drainage flow often occurs? This paper examines the use of the bulk Richardson number to classify wind speed profiles observed above a sloping forest at nighttime. Wind speed profiles above a sloping forest were classified by the bulk Richardson numberRi B. Use ofRi B distinguished between drainage flow, shear flow, and transitional flow from drainage flow to shear flow. These results suggest thatRi B is useful to interpret nighttime CO2 and energy fluxes above a sloping forest. Through clear observational evidence, we also show that the reference height should be high enough to avoid drainage-flow effects when calculatingRi B.
- Subjects
WIND speed; FORESTS &; forestry; FLUID dynamics; SHEAR flow; FOREST canopy gaps
- Publication
Boundary-Layer Meteorology, 2005, Vol 115, Issue 2, p205
- ISSN
0006-8314
- Publication type
Article
- DOI
10.1007/s10546-004-3408-x