A103
Observations and Predictability of the Atmosphere over Complex Terrain

Session ID#: 77513

Session Description:
Mountainous terrain is complex given the variety of slope angles and orientations, surface types, valley widths and curvatures. Atmospheric circulations over this intricate geometry arise from synoptic, orographic and/or thermally-driven pressure gradients, resulting in inherently complex motions with a wide range of spatial and temporal scales. Although recent years have seen sustained efforts to improve the predictability of flows over complex terrain, several scientific questions remain unsolved.

This session focuses on micro-scale and meso-scale atmospheric phenomena in the atmospheric boundary layer over mountainous terrain. We seek original contributions including theoretical, observational and modeling studies that are related to mountain meteorology. Topics of interest emerging from synergetic fields are also welcomed, including data assimilation, remote sensing, hydrology, air quality, fog formation, agriculture/viticulture, fire weather, urban canopies in complex terrain, and snow transport.

Index Terms:

3307 Boundary layer processes [ATMOSPHERIC PROCESSES]
3322 Land/atmosphere interactions [ATMOSPHERIC PROCESSES]
3329 Mesoscale meteorology [ATMOSPHERIC PROCESSES]
3379 Turbulence [ATMOSPHERIC PROCESSES]

Primary Convener:  Holly J Oldroyd, University of California Davis, Civil and Environmental Engineering, Davis, CA, United States
Conveners:  Natalie S Wagenbrenner, Missoula Fire Sciences Laboratory, Missoula, MT, United States; USDA Forest Service, Moscow, ID, United States, Heather Holmes, University of Nevada Reno, Atmospheric Sciences Program, Department of Physics, Reno, NV, United States and Daniel Nadeau, Laval University, Civil and Water Engineering, Quebec City, QC, Canada
Primary Liaison:  Holly J Oldroyd, University of California Davis, Civil and Environmental Engineering, Davis, CA, United States
 
Identification of Forecast Biases to Improve Fire Danger Forecasts in Colorado (499532)
Brandon Keith Cohen1, Paul T. Schlatter2 and Lisa Kriederman2, (1)Univ. of Louisiana Monroe, Department of Atmospheric Science, Monroe, LA, United States, (2)National Weather Service, Boulder, Boulder, CO, United States
 
Near-Surface Turbulent Exchange in an East-West Oriented Alpine Valley (Invited) (501478)
Manuela Lehner, Mathias Walter Rotach, Friedrich Obleitner, Eleni Sfyri and Ivana Stiperski, University of Innsbruck, Innsbruck, Austria
 
Reproducibility of surface wind and tracer transport simulations over a complex terrain using 5, 3 and 1 km grid models (505454)
Tsuyoshi Thomas Sekiyama, Meteorological Research Institute, Ibaraki, Japan and Mizuo Kajino, Meteor. Res. Inst., Tsukuba, Ibaraki, Japan
 
Lapse Rates of Near-surface Air Temperature and Land Surface Temperature from 1965 to 2014 in China (505806)
Yanyi He and Kaicun Wang, Beijing Normal University, Beijing, China
 
How do we define Atmospheric Stability in Complex Terrain? Suggestions from comparing the XPIA and Perdigão Campaigns (Invited) (534314)
Julie K Lundquist1, Robert Menke2, Steven Oncley3, Jakob Mann2,4, Nicola Bodini5 and Elizabeth Eaton6, (1)U. of Colorado at Boulder, Boulder, CO, United States, (2)Technical University of Denmark, Wind Energy, Roskilde, Denmark, (3)National Center for Atmospheric Research, Earth Observing Laboratory, Boulder, CO, United States, (4)DTU Wind Energy, Roskilde, Denmark, (5)University of Colorado at Boulder, ATOC, Boulder, CO, United States, (6)University of Colorado Boulder, Dept of Atmospheric and Oceanic Sciences, Boulder, CO, United States
 
Understanding how Complex Terrain Impacts Tornado Dynamics using a Suite of High-Resolution Numerical Simulations (543310)
Martin Satrio1, David Joseph Bodine1, Anthony Reinhart2, Takashi Maruyama3 and Franklin Lombardo4, (1)University of Oklahoma, Advanced Radar Research Center, Norman, OK, United States, (2)OU/CIMMS and NOAA/OAR/NSSL, Norman, OK, United States, (3)Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan, (4)University of Illinois at Urbana Champaign, Department of Civil and Environmental Engineering, Urbana, IL, United States
 
Weather model resolution and orographic impacts on a sudden downwelling event in a lake hydrodynamics model (545003)
Campbell Watson1, Guillaume Auger2, Lloyd A. Treinish1 and Harry Kolar1, (1)IBM Research USA, Yorktown Heights, NY, United States, (2)IBM Research, Yorktown Heights, NY, United States
 
The Impact of Grid Resolution on Fog and Low Stratus Modelling in Complex Terrain (576330)
Stephanie Westerhuis1, Oliver Fuhrer2, Andreas Bott3 and Werner Eugster1, (1)ETH Zurich, Zurich, Switzerland, (2)MeteoSwiss Federal Office of Meteorology and Climatology, Zurich, Switzerland, (3)University of Bonn, Bonn, Germany
 
The Potential Role of a Downslope Windstorm and Associated Hydraulic Jump in the Formation of a Fire Tornado during the 2018 Carr Fire in Redding, CA (595857)
Natalie Wagenbrenner, USDA Forest Service, Missoula, MT, United States and Jason Forthofer, Missoula Fire Sciences Laboratory, Missoula, MT, United States
 
To Scale or Not to Scale: The Question is Truly How to Characterize the Integral Scales of Turbulence. (616275)
Kelsey Everard1, Holly J Oldroyd2, Andreas Christen3, Marc B Parlange4 and Greg Lawrence1, (1)University of British Columbia, Civil Engineering, Vancouver, BC, Canada, (2)University of California Davis, Civil and Environmental Engineering, Davis, CA, United States, (3)University of Freiburg, Chair of Environmental Meteorology, Faculty of Environment and Natural Resources, Freiburg, Germany, (4)Monash University, Department of Civil Engineering, Melbourne, VIC, Australia
 
Scalar Transport in Turbulent Flows over Rough Surfaces (619632)
Manuel F Schmid, University of British Columbia, Faculty of Applied Science, Department of Civil Engineering, Vancouver, BC, Canada, Marco Giometto, Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY, United States and Marc B Parlange, Monash University, Department of Civil Engineering, Melbourne, VIC, Australia
 
Observations of the Daytime, Anabatic Winds over a Steep Alpine Slope (619711)
Holly J Oldroyd, University of California Davis, Civil and Environmental Engineering, Davis, CA, United States, Eric Pardyjak, University of Utah, Salt Lake City, UT, United States and Marc B Parlange, Monash University, Department of Civil Engineering, Melbourne, VIC, Australia
 
Horizontal Averaging of Urban Canopy Flows (621485)
Marc B Parlange, Monash University, Department of Civil Engineering, Melbourne, VIC, Australia, Manuel F Schmid, University of British Columbia, Faculty of Applied Science, Department of Civil Engineering, Vancouver, BC, Canada, Gregory A Lawrence, Univ British Columbia, Vancouver, BC, Canada and Marco Giometto, Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY, United States
 
Drag and Drag Partition on Vegetated Urban Canopies (625072)
Marco Giovanni Giometto, Columbia University, Department of Civil Engineering and Engineering Mechanics, New York, NY, United States, Manuel F Schmid, University of British Columbia, Faculty of Applied Science, Department of Civil Engineering, Vancouver, BC, Canada and Marc B Parlange, Monash University, Department of Civil Engineering, Melbourne, VIC, Australia
 
Local similarity functions for katabatic flows derived from field observations over steep- and shallow-angled slopes (632523)
Chaoxun Hang1, Holly J Oldroyd2, Eric Pardyjak3 and Marc B Parlange1, (1)Monash University, Department of Civil Engineering, Melbourne, VIC, Australia, (2)EPFL, Lausanne, Switzerland, (3)University of Utah, Salt Lake City, UT, United States
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