By George Burba, Dan Anderson
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Additional info for A Brief Practical Guide to Eddy Covariance Flux Measurements: Principles and Workflow Examples for Scientific and Industrial Applications
For example, the consumption by entire open-path Eddy Covariance station in Florida Everglades was <30 Watts, including LI-7700 for CH4, LI-7500 for CO2/H2O, sonic anemometer, and air temperature/relative humidity sensors and barometer. The 12 lb. 5 kg) open-path methane analyzer was carried into the wetland by one person in a backpack, along with tools, other sensors, and a laptop. LI-COR Biosciences | Brief Guide To Eddy Covariance Measurements 47 OPEN-PATH LI-7700 FEATURES removable radiation shield (outline) •solution spray •rotating mirror laser circuitry and monitoring fast in-path thermocouple open-path Heriott cell • self-cleaning mirror fast pressure sensor Field maintenance is minimized by a selfcleaning lower mirror to help keep it contamination-free data acquisition and signal processing The LI-7700 uses WMS (Wavelength Modulation Spectroscopy) technology that employs a VCSEL (vertical-cavity surface-emitting laser) and an open multi-pass cell design.
For near surface deployments, the LI-7700 should be 10-30 cm horizontally from the anemometer, and they should have a minimal vertical separation depending on surface roughness and other factors. , wind from sonic anemometer), as it may lead to errors and may require difficult to predict corrections. Brief Guide To Eddy Covariance Measurements |Burba & Anderson OPEN-PATH LI-7700 CALIBRATION Eddy Covariance Tower for CH4, CO2, H2O fluxes Solar-powered Eddy Covariance station with LI-7700 and LI-7500 in Florida Everglades solar panels batteries • The power consumption by the entire Eddy Covariance station in the Florida Everglades was <30 Watts, including LI-7700 for CH4, LI-7500 for CO2/H2O, sonic anemometer, and air temperature/relative humidity sensors and barometer • The 12 lb.
Fine-wire thermocouples are stretched across the inlet and the outlet ports of the sampling cell. Inserting long objects into the inlet and outlet ports may damage the thermocouples. 7 m). For the LI-7200, the default intake was designed to maximize the attenuation of instantaneous fluctuations of temperature, and to minimize the attenuation of instantaneous fluctuations of water at the same time. This helps to significantly reduce WPL term and associated uncertainties, without requiring excessive frequency response corrections for water vapor flux and its uncertainties.