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Atmosphere 2018, 9(12), 498; https://doi.org/10.3390/atmos9120498

Temporal Patterns and Vertical Temperature Gradients in Micro-Scale Drainage Flow Observed Using Thermal Imaging

1
Department of Geography, Ruhr-University of Bochum, 44801 Bochum, Germany
2
Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research, 76128 Karlsruhe, Germany
3
Karlsruhe Institute of Technology (KIT), Institute of Photogrammetry and Remote Sensing, 76128 Karlsruhe, Germany
*
Author to whom correspondence should be addressed.
Received: 29 September 2018 / Revised: 3 December 2018 / Accepted: 12 December 2018 / Published: 14 December 2018
(This article belongs to the Section Biosphere/Hydrosphere/Land - Atmosphere Interactions)
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Abstract

Micro-scale cold-air flow along a gentle slope was analyzed using thermal infrared imaging (TIR), focusing exclusively on the lowermost 2 m above ground. Cold-air pulses were analyzed with regard to their vertical temperature stratification as well as flow characteristics, such as flow speed. Analyses on the transition zone between the near-surface very stable inversion layer and the less stable, warmer air above highlight turbulent situations and detrainment effects at the cold-air inversion top. Using thermal imaging in a high spatiotemporal resolution with up to 90 vertical data points and TIR pixels for 1.5 m cold-air depth, a high-precision cold-air flow analysis was realized. View Full-Text
Keywords: micro-scale cold-air flow; thermal infrared imaging; remote sensing; nocturnal drainage flow micro-scale cold-air flow; thermal infrared imaging; remote sensing; nocturnal drainage flow
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Grudzielanek, A.M.; Cermak, J. Temporal Patterns and Vertical Temperature Gradients in Micro-Scale Drainage Flow Observed Using Thermal Imaging. Atmosphere 2018, 9, 498.

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