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Month: November 2011

EddyPro Units – Distinguishing Between Molar Density, Mole Fraction, and Mixing Ratio

EddyPro Units – Distinguishing Between Molar Density, Mole Fraction, and Mixing Ratio

Confused by the units provided by your gas analyzer? Which units should you use when processing eddy covariance data sets in EddyPro? This chart summarizes the definition of units, different ways to express measurements, and which instruments record data in which units.

Measurement Type Intended Meaning Common Units Typical Instruments Molar Density • A measurement representing the number of moles of a molecule present in a unit volume of air.
• It can also be the mass per unit…

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Building Carbon Budgets for Hawaii’s Forests

Building Carbon Budgets for Hawaii’s Forests

Quantifying how rising temperatures will impact soil carbon storage is crucial to predicting the future effects of CO2. Globally, soils contain more carbon than above-ground vegetation and the atmosphere combined. A research team led by Dr. Creighton M. Litton of the University of Hawaii aims to build carbon budgets for Hawaii’s forests, detailing the carbon inputs and outputs of the system. Using the LI-8100A Automated Soil CO2 Flux System, the research team measures soil-surface CO2 efflux to investigate how carbon…

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Configuring the CSAT3 for Data Logging in .ghg Format

Configuring the CSAT3 for Data Logging in .ghg Format

A CSAT3 sonic anemometer (Campbell Scientific, Inc., Logan, UT) can be configured to log raw flux data in conjunction with an LI-7500A or LI-7200 infrared gas analyzer from LI-COR in a compressed .ghg file format. The .ghg file format makes it possible to continuously collect raw flux data for more than two months on a single 4 GB USB drive and to process data conveniently with LI-COR’s new EddyPro™ Express flux data processing software.

1. The CSAT3 is connected to…

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