An objective method for determining principal time scales of coherent eddy structures using orthonormal wavelets |
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| Institution: | 1. Conservation and Survey Division, Institute of Agriculture and Natural Resources, University of Nebraska-Lincoln, 113 Nebraska Hall, Lincoln, NE 68588-0517, USA;2. Department of Geography and Environmental Engineering, The Johns Hopkins University, Baltimore, MD, 21218-2686, USA;3. School of the Environment, Duke University, Durham, NC 27708-0328, USA;4. Department of Environmental Sciences, University of Virginia, Charlottesville, VA, 22903, USA;1. School of Chemical Sciences, The University of Auckland, Auckland, New Zealand;2. The MacDiarmid Institute for Advanced Materials and Nanotechnology, New Zealand;3. The Dodd Walls Centre for Photonic and Quantum Technologies, New Zealand;1. Department of Food Science and Technology, BOKU-University of Natural Resources and Life Sciences, Vienna, Austria;2. Department of Food Technology, Ramkhamhaeng University, Bangkok, Thailand;1. Hitotsubashi University, Japan;2. Waseda University, Japan;3. University of Petroleum and Energy Studies, India;1. Institute for Hygiene and Applied Immunology, Water Hygiene, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Austria;2. Institute for Specific Prophylaxis and Tropical Medicine, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Austria;3. Institute for Medical Microbiology and Hygiene, Medical Faculty “Carl Gustav Carus”, Technical University Dresden, Germany;4. Interuniversity Cooperation Centre for Water and Health, Austria;1. Department of Neurology, Children’s Hospital of Chongqing Medical University, China;2. Ministry of Education Key Laboratory of Child Development and Disorders, China;3. Key Laboratory of Pediatrics in Chongqing, CSTC2009CA5002, China;4. Chongqing International Science and Technology Cooperation Center for Child Development and Disorders, China;5. MEG Center, Department of Neurology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH, 45220, USA |
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| Abstract: | A new, parameter-free method, based on orthonormal wavelet expansions is proposed for calculating the principal time scale of coherent structures in atmospheric surface layer measurements. These organized events play an important role in the exchange of heat, mass, and momentum between the land and the atmosphere. This global technique decomposes the energy contribution at each scale into organized and random eddy motion. The method is demonstrated on vertical wind velocity measurements above bare and vegetated surfaces. It is found to give nearly identical results to a local thresholding approach developed for signal de-noising that assigns the wavelet coefficients to organized and random motion. The effect of applying anti- and/or near-symmetrical wavelet basis functions is also investigated. |
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