A5015623686- Meteorological Phenomena and Simulations
- Cryospheric studies and observations
- Plant Water Relations and Carbon Dynamics
- Urban Heat Island Mitigation
- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Wind and Air Flow Studies
- Aeolian processes and effects
- Climate change and permafrost
École Polytechnique Fédérale de Lausanne
2024
Abstract Snow is a vital part of water resources, and sublimation may remove 10%–90% snowfall from the system. To improve our understanding physics that govern rates, as well how those rates might change with climate, we deployed an array four towers over 100 instruments NCAR’s Integrated Surface Flux System November 2022 to June 2023 in East River watershed, Colorado, conjunction U.S. Department Energy’s Atmosphere Field Laboratory (SAIL) National Oceanic Atmospheric Administration (NOAA)’s...
Abstract The lateral transport of heat above abrupt (sub-)metre-scale steps in land surface temperature influences the local energy balance. We present a novel experimental method to investigate stratification and dynamics near-surface atmospheric layer over heterogeneous surface. Using high-resolution thermal infrared camera pointing at synthetic screens, $$30\,\hbox {Hz}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>30</mml:mn> <mml:mspace />...
Dynamic downscaling of atmospheric forcing data to the hectometer resolution has shown increases in accuracy for landsurface models, but at great computational cost. Here we present a validation novel intermediate complexity model, HICAR, developed scale applications. HICAR can run more than 500x faster conventional while containing many same physics parameterizations. Station measurements air temperature, wind speed, and radiation, combination with from scanning Doppler LiDAR, are compared...
Abstract In absence of the high-frequency measurements wind components, sonic temperature and water vapour required by eddy covariance (EC) method, Monin–Obukhov similarity theory (MOST) is often used to calculate heat fluxes. However, MOST requires assumptions stability corrections roughness lengths. most environments weather situations, length have high uncertainty. Here, we revisit modified Bowen-ratio which call C-method, latent flux over snow. measurements, use anemometer data, become...
The near-surface boundary layer over patchy snow is highly heterogeneous and dynamic. Layers of opposing stability coexist within only a few horizontal meters. Conventional experimental methods to investigate this suffer from limitations related the fixed positions eddy covariance sensors. To overcome these difficulties, we set up centimeter-resolution large simulation flow across an idealised transition bare ground snow. We force with high-frequency data recorded during field campaign. show...