Urban canopy layer

From Glossary of Meteorology

urban canopy layer

The layer of air in the urban canopy beneath the mean height of the buildings and trees.

Its climate is dominated by microscale processes due to the complex array of surfaces (their orientation, albedo, emissivity, thermal properties, wetness, etc.). It is a zone of multiple reflection and emission, wakes and vortices, especially in the urban canyons.
Compare urban boundary layer.

Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.