Accounting for spectroscopic effects in laser‐based open‐path eddy covariance flux measurements
Abstract
Abstract A significant portion of the production and consumption of trace gases (e.g. CO 2 , CH 4 , N 2 O, NH 3 , etc.) by world ecosystems occurs in areas without sufficient infrastructure or easily available grid power to run traditional closed‐path flux stations. Open‐path analyzer design allows such measurements with power consumption 10–150 times below present closed‐path technologies, helping to considerably expand the global coverage and improve the estimates of gas emissions and budgets, informing the remote sensing and modeling communities and policy decisions, all the way to IPCC reports. Broad‐band nondispersive infrared devices have been used for open‐path CO 2 and H 2 O measurements since the late 1970s, but since recently, a growing number of new narrow‐band laser‐based instruments are being rapidly developed. The new design comes with its own challenges, specifically: (a) mirror contamination, and (b) uncontrolled air temperature, pressure and humidity, affecting both the gas density and the laser spectroscopy of the measurements. While the contamination can be addressed via automated cleaning, and density effects can be addressed via the Webb‐Pearman‐Leuning approach, the spectroscopic effects of the in situ temperature, pressure and humidity fluctuations on laser‐measured densities remain a standing methodological question. Heremore »
- Authors:
-
[1];
- R&,D, LI‐COR Biosciences Lincoln Nebraska, R.B. Daugherty Water for Food Global Institute &, School of Natural Resources University of Nebraska Lincoln Nebraska
- Apple Computer Cupertino California
- R&,D, LI‐COR Biosciences Lincoln Nebraska
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1508179
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Global Change Biology
- Additional Journal Information:
- Journal Name: Global Change Biology Journal Volume: 25 Journal Issue: 6; Journal ID: ISSN 1354-1013
- Publisher:
- Wiley-Blackwell
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Burba, George, Anderson, Tyler, and Komissarov, Anatoly. Accounting for spectroscopic effects in laser‐based open‐path eddy covariance flux measurements. United Kingdom: N. p., 2019.
Web. doi:10.1111/gcb.14614.
Burba, George, Anderson, Tyler, & Komissarov, Anatoly. Accounting for spectroscopic effects in laser‐based open‐path eddy covariance flux measurements. United Kingdom. https://doi.org/10.1111/gcb.14614
Burba, George, Anderson, Tyler, and Komissarov, Anatoly. Sun .
"Accounting for spectroscopic effects in laser‐based open‐path eddy covariance flux measurements". United Kingdom. https://doi.org/10.1111/gcb.14614.
@article{osti_1508179,
title = {Accounting for spectroscopic effects in laser‐based open‐path eddy covariance flux measurements},
author = {Burba, George and Anderson, Tyler and Komissarov, Anatoly},
abstractNote = {Abstract A significant portion of the production and consumption of trace gases (e.g. CO 2 , CH 4 , N 2 O, NH 3 , etc.) by world ecosystems occurs in areas without sufficient infrastructure or easily available grid power to run traditional closed‐path flux stations. Open‐path analyzer design allows such measurements with power consumption 10–150 times below present closed‐path technologies, helping to considerably expand the global coverage and improve the estimates of gas emissions and budgets, informing the remote sensing and modeling communities and policy decisions, all the way to IPCC reports. Broad‐band nondispersive infrared devices have been used for open‐path CO 2 and H 2 O measurements since the late 1970s, but since recently, a growing number of new narrow‐band laser‐based instruments are being rapidly developed. The new design comes with its own challenges, specifically: (a) mirror contamination, and (b) uncontrolled air temperature, pressure and humidity, affecting both the gas density and the laser spectroscopy of the measurements. While the contamination can be addressed via automated cleaning, and density effects can be addressed via the Webb‐Pearman‐Leuning approach, the spectroscopic effects of the in situ temperature, pressure and humidity fluctuations on laser‐measured densities remain a standing methodological question. Here we propose a concept accounting for such effects in the same manner as Webb et al. proposed to account for respective density effects. Derivations are provided for a general case of flux of any gas, examined using a specific example of CH 4 fluxes from a commercially available analyzer, and then tested using “zero‐flux” experiment. The proposed approach helps reduce errors in open‐path, enclosed, and temperature‐ or pressure‐uncontrolled closed‐path laser‐based flux measurements due to the spectroscopic effects from few percents to multiple folds, leading to methodological advancement and geographical expansion of the use of such systems providing reliable and consistent results for process‐level studies, remote sensing and Earth modeling applications, and GHG policy decision‐making.},
doi = {10.1111/gcb.14614},
journal = {Global Change Biology},
number = 6,
volume = 25,
place = {United Kingdom},
year = {Sun Apr 21 00:00:00 EDT 2019},
month = {Sun Apr 21 00:00:00 EDT 2019}
}
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https://doi.org/10.1111/gcb.14614
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