Title:
======
Vertical Profiles of Scalars, Wind, and Turbulence Just-Above
and Within a Subalpine Forest in Complex Terrain


Authors:
=========
Burns Sean P. (1,2), Bonan, Gordon B. (1), Patton, Edward G. (1),
Lenschow, Donald H. (1), and Blanken Peter D. (2).


Abstract Text:
==============
Since November 1998 the Niwot Ridge Subalpine Forest AmeriFlux tower
(US-NR1) has been measuring vertical profiles of scalars (air
temperature, humidity, CO2), wind speed and direction, and turbulence
beneath the primary flux-measurement level (21.5 m). The US-NR1 site
is located in a mixed conifer subalpine forest (leaf area index ~ 4.0)
in complex mountainous terrain approximately 8 km east of the
Continental Divide below Niwot Ridge, Colorado. The site's slope
ranges from 4-7 degrees with much steeper terrain within several km
west of the tower. In this study, we examine how near-ground
atmospheric stability modifies the vertical profiles of scalars, wind
speed, wind direction, and turbulence both within and just-above the
forest canopy. The focus of this presentation will be on the
characteristics of the downslope nocturnal drainage flow. This study
is also preparing the US-NR1 observations for a forthcoming data-model
comparison using a multi-layer canopy model (CLM-ml; Bonan et al.,
2018).

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Reference:

Bonan, G.B., Patton, E.G., Harman, I.N., Oleson, K.W., Finnigan, J.J.,
Lu, Y., Burakowski, E.A., 2018. Modeling canopy-induced turbulence in
the Earth system: A unified parameterization of turbulent exchange
within plant canopies and the roughness sublayer (CLM-ml v0),
Geoscientific Model Development, 11, 1467-1496.
https://doi.org/10.5194/gmd-11-1467-2018