Distinguishing Time Scales of Katabatic Flow in Complex Terrain
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Drainage Flow Identification
3.1.1. Tower Transect
3.1.2. Diurnal Evolution of Near-Surface Temperature
3.2. Lapse Rate Scale Dependencies
3.2.1. Dependency of Near-Surface Lapse Rate to Flow Channel Proximity
3.2.2. Dependency of Near-Surface Lapse Rate to Downslope Distance (Range)
3.3. Cooling Rate Scale Dependencies
3.3.1. Dependency of Cooling Rate to Height and Day/Night Transition
3.3.2. Dependency of Cooling Rate to Slope Angle
3.3.3. Basin-Scale Cooling Rate
4. Discussion
5. Conclusions
- At local scales, the critical length scale is position relative to a local drainage feature. It is likely that advection through these local features account for a disproportionate amount of the total transport (the timescales are faster) but local-scale flux measurements to verify this hypothesis were unavailable during the MATERHORN experiment;
- With increasing spatial and temporal scale, slope and range become the most important causative spatial variables;
- Katabatic wind speed at a given location downrange is therefore an integration of local and basin scale contributions, both of which evolve in magnitude following shade front passage.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Drake, S.; Higgins, C.; Pardyjak, E. Distinguishing Time Scales of Katabatic Flow in Complex Terrain. Atmosphere 2021, 12, 1651. https://doi.org/10.3390/atmos12121651
Drake S, Higgins C, Pardyjak E. Distinguishing Time Scales of Katabatic Flow in Complex Terrain. Atmosphere. 2021; 12(12):1651. https://doi.org/10.3390/atmos12121651
Chicago/Turabian StyleDrake, Stephen, Chad Higgins, and Eric Pardyjak. 2021. "Distinguishing Time Scales of Katabatic Flow in Complex Terrain" Atmosphere 12, no. 12: 1651. https://doi.org/10.3390/atmos12121651