Application of the Hilbert–Huang Transform to the Estimation of Air-Sea Turbulent Fluxes

The Hilbert–Huang transform (HHT) is applied to analyzing the turbulent time series obtained within the atmospheric boundary layer over the ocean. A method based on the HHT is introduced to reduce the influence of non-turbulent motions on the eddy-covariance based flux by removing non-turbulent mode...

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Bibliographic Details
Published in:Boundary-layer meteorology 2013-06, Vol.147 (3), p.553-568
Main Authors: Wang, Juanjuan, Song, Jinbao, Huang, Yansong, Fan, Conghui
Format: Article
Language:English
Subjects:
Aerodynamics
Atmospheric boundary layer
Atmospheric Protection/Air Quality Control/Air Pollution
Atmospheric Sciences
Boundaries
Boundary layers
Convection, turbulence, diffusion. Boundary layer structure and dynamics
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
Effectiveness studies
Estimating techniques
Exact sciences and technology
External geophysics
Fluctuations
Fluid dynamics
Fluxes
Mathematical analysis
Meteorology
Planetary boundary layer
Sensible heat
Time series
Transforms
Turbulence
Turbulence models
Wind
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Summary:The Hilbert–Huang transform (HHT) is applied to analyzing the turbulent time series obtained within the atmospheric boundary layer over the ocean. A method based on the HHT is introduced to reduce the influence of non-turbulent motions on the eddy-covariance based flux by removing non-turbulent modes from the time series. The scale dependence of the flux is examined and a gap mode is identified to distinguish between turbulent modes and non-turbulent modes. To examine the effectiveness of this method it is compared with three conventional methods (block average, moving-window average, and multi-resolution decomposition). The data used are from three sonic anemometers installed on a moored buoy at about 6, 4 and 2.7 m height above the sea surface. For each method, along-wind and cross-wind momentum fluxes and sensible heat fluxes at the three heights are calculated. According to the assumption of a constant-flux layer, there should be no significant difference between the fluxes at the three heights. The results show that the fluxes calculated using HHT exhibit a smaller difference and higher correlation than the other methods. These results support the successful application of HHT to the estimation of air-sea turbulent fluxes.
ISSN:0006-8314
1573-1472
DOI:10.1007/s10546-012-9784-8