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Related Concept Videos

Eddy Currents01:25

Eddy Currents

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
Econometric Views (EViews)01:29

Econometric Views (EViews)

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Correlation of Experimental Data01:23

Correlation of Experimental Data

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Theory of Attribution II: Kelley's Covariation Theory01:29

Theory of Attribution II: Kelley's Covariation Theory

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Related Experiment Video

Updated: Jul 7, 2026

Measurements of CO2 Fluxes at Non-Ideal Eddy Covariance Sites
09:05

Measurements of CO2 Fluxes at Non-Ideal Eddy Covariance Sites

Published on: June 24, 2019

Eddy Covariance Theory: A Review.

Jeffrey D Wood1, Lianhong Gu2, Adam P Schreiner-McGraw3

  • 1School of Natural Resources, University of Missouri, Columbia, Missouri, USA.

Global Change Biology
|July 6, 2026
PubMed
Summary

Eddy covariance (EC) measurements are crucial for understanding biosphere-atmosphere exchanges. This study revisits EC theory, proposing refined calculations for sensible heat flux to improve ecosystem gas and heat exchange measurements.

Keywords:
ecosystem fluxesland–atmosphere interactionsmass and heat transfernet ecosystem exchangeturbulence

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Basics of Multivariate Analysis in Neuroimaging Data
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Basics of Multivariate Analysis in Neuroimaging Data

Published on: July 24, 2010

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Measurements of CO2 Fluxes at Non-Ideal Eddy Covariance Sites
09:05

Measurements of CO2 Fluxes at Non-Ideal Eddy Covariance Sites

Published on: June 24, 2019

Basics of Multivariate Analysis in Neuroimaging Data
06:35

Basics of Multivariate Analysis in Neuroimaging Data

Published on: July 24, 2010

Area of Science:

  • Environmental science
  • Atmospheric science
  • Ecosystem ecology

Background:

  • Eddy covariance (EC) is the standard for measuring ecosystem gas and heat fluxes, vital for global change biology.
  • Persistent challenges in EC measurements, like energy balance closure, necessitate theoretical re-evaluation.

Purpose of the Study:

  • To review theoretical developments in eddy covariance (EC) measurements.
  • To address persistent challenges in EC, focusing on sensible heat flux and vertical wind velocity.
  • To present a framework for improved sensible heat flux calculations.

Main Methods:

  • Review of theoretical foundations of EC.
  • Identification of key areas for theoretical refinement: vertical flux density, flux attenuation, coordinate rotations, and energy balance closure.
  • Development of a new framework for sensible heat flux calculation based on fluid mechanics and thermodynamics.

Main Results:

  • Theoretical advancements in four key EC areas are presented.
  • A framework for improved sensible heat flux calculation is proposed, integrating coupled heat and mass transfer.
  • The study highlights the need for unbiased measurements for ecosystem research and model validation.

Conclusions:

  • Refined EC theory, particularly for sensible heat flux, is essential for accurate ecosystem-atmosphere exchange measurements.
  • Improved EC methods will enhance our understanding of biosphere-atmosphere interactions and global change.
  • The proposed framework aids in validating satellite observations and land surface models.