Estimating the Random Error in Eddy-Covariance Based Fluxes and Other Turbulence Statistics: The Filtering Method

Scott T. Salesky, Marcelo Chamecki, Nelson L. Dias

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

A spatially local decomposition of turbulent fluxes based on properties of spatial filters is used to develop a new method of estimating random error in turbulent moments of any order. The proposed error estimation method does not require an estimate of the integral time scale, which can be highly sensitive to the method used to calculate it. The error estimation method is validated using synthetic flux data with a known ensemble mean and intercompared with existing methods using data from the Advection Horizontal Array Turbulence Study (AHATS). Typical errors for a 27.3-min block of data collected at a height of 8 m are found to be approximately 10% for the heat flux and 7-15% for variances. The error in the momentum flux increases rapidly with increasing atmospheric instability, reaching values of 40% or greater for unstable conditions. A new method based on filtering is also proposed to estimate integral time scales of turbulent quantities.

Original languageEnglish (US)
Pages (from-to)113-135
Number of pages23
JournalBoundary-Layer Meteorology
Volume144
Issue number1
DOIs
StatePublished - Jul 2012

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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