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Inter-comparison of Two High-accuracy Fast-response Spectroscopic Sensors of Carbon Dioxide: a Case Study : Volume 5, Issue 5 (08/05/2012)

By Flowers, B. A.

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Book Id: WPLBN0003999068
Format Type: PDF Article :
File Size: Pages 7
Reproduction Date: 2015

Title: Inter-comparison of Two High-accuracy Fast-response Spectroscopic Sensors of Carbon Dioxide: a Case Study : Volume 5, Issue 5 (08/05/2012)  
Author: Flowers, B. A.
Volume: Vol. 5, Issue 5
Language: English
Subject: Science, Atmospheric, Measurement
Collection: Periodicals: Journal and Magazine Collection
Subcollection: Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description
Description: Earth and Environmental Science Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. Tunable diode laser absorption (TDL) and cavity ring-down spectroscopic (CRDS) sensors for atmospheric carbon dioxide were co-deployed during summer and fall of 2010 in field and laboratory conditions at Los Alamos National Laboratory. Both sensors were characterized for accuracy and precision for ambient carbon dioxide measurements at ground level and compared using both laboratory and ambient field data. After post-processing that included water vapor correction and calibration to WMO reference standards, overall mean [12C16O2] = 392.05 ± 8.92 ppm and [12C16O2] = 392.22 ± 9.05 ppm were observed between 29 July and 16 August 2010. The mean difference between the CRDS and TDL data for 12CO2 was 0.04 ± 1.80 ppm (±1σ in 60 s) for ambient field data, demonstrating the sensors meet the WMO/IAEA compatibility standard. The observations show over the 19-day period the [CO2]CRDS'/[CO2]TDL ratio exhibits a Gaussian distribution centered at x0 = 1.003 ± 3.38 × 10−5 (±1σ), indicating the ratio is dominated by random noise as opposed to a bias in the output of either sensor. The CRDS sensor is capable of measuring [12C16O2] to a precision of 23 ppb in 1 min and decreases to 6.5 ppb in 58 min. At one and 58-min, the TDL exhibits precisions of 29 ppb and 53 ppb. The CRDS is compact, fast, and stable; the TDL is larger and requires frequent calibrations to maintain its precision. The sensors also exhibit consistent hourly averaged diurnal values underscoring the interplay of biological, anthropogenic, and transport processes regulating CO2 at the site.

Summary
Inter-comparison of two high-accuracy fast-response spectroscopic sensors of carbon dioxide: a case study

Excerpt
Bowling, K., Sargent, S. D., Tanner, B. D., and Ehleringer, J. R.: Tunable diode laser absorption spectroscopy for stable isotope studies of ecosystem-atmosphere CO2 exchange, Agr. Forest Meteorol., 118, 1–19, 2003.; Brown, S. S.: Absorption Spectroscopy in High-Finesse Cavities for Atmospheric Studies, Chem. Rev., 103, 5219–5238, doi:10.1021/cr020645c, 2003.; Crosson, E. R.: A cavity ring-down analyzer for measuring atmospheric levels of methane, carbon dioxide, and water vapor, Appl. Phys. B, 92, 403–408, 2008.; Chen, H., Winderlich, J., Gerbig, C., Hoefer, A., Rella, C. W., Crosson, E. R., Van Pelt, A. D., Steinbach, J., Kolle, O., Beck, V., Daube, B. C., Gottlieb, E. W., Chow, V. Y., Santoni, G. W., and Wofsy, S. C.: High-accuracy continuous airborne measurements of greenhouse gases (CO2 and CH4) using the cavity ring-down spectroscopy (CRDS) technique, Atmos. Meas. Tech., 3, 375–386, doi:10.5194/amt-3-375-2010, 2010.; Karlon, A., Sweeney, C., Tans, P., and Newberger, T.: AirCore: An Innovative Atmospheric Sampling System, J. Atmos. Ocean. Tech., 27, 1839–1852, 2010.; Pataki, D. E., Bowling, D. R., Ehleringer, J. R., and Zobitz, J. M.: High resolution atmospheric monitoring of urban carbon dioxide sources, Geophys. Res. Lett., 33, L03813, doi:10.1029/2005GL024822, 2006.; Powers, H. H., Hunt, J. E., Hanson, D. T., and McDowell, N. G.: A dynamic soil chamber system coupled with a tunable diode laser for online measurements of δ13C, δ18O, and efflux rate of soil-respired CO2, Rapid Commun. Mass Spectrom., 24, 243–253, 2010.; Rella, C.: Accurate Greenhouse Gas Measurements in Humid Gas Streams Using the Picarro G1301 Carbon Dioxide/Methane/Water Vapor Gas Analyzer, Sunnyvale, CA, 2010.; Shim, J., Powers, H. H., Meyer, C., Pockman, W., and McDowell, N.: The role of inter-annual, seasonal, and synoptic climate on the carbon isotope ratio of ecosystem respiration at a semi-arid woodland, Global Change Biol., 17, 2584–2600, doi:10.1111/j.1365-2486.2011.02454.x, 2011.; Tuzson, B., Hiller, R. V., Zeyer, K., Eugster, W., Neftel, A., Ammann, C., and Emmenegger, L.: Field intercomparison of two optical analyzers for CH4 eddy covariance flux measurements, Atmos. Meas. Tech., 3, 1519–1531, doi:10.5194/amt-3-1519-2010, 2010.; Werle, P.: Time domain characterization of micrometeorological data based on a two sample variance, Agr. Forest Meteorol., 150, 832–840, 2010.; Werle, P., Mücke, R., and Slemr, F.: The Limits of Signal Averaging in Atmospheric Trace-Gas Monitoring by Tunable Diodle-Laser Absorption Spectroscopy (TDLAS), Appl. Phys. B, 57, 131–139, 1993.; WMO: 15th WMO/IAEA Meeting of Experts on Carbon Dioxide, Other Greenhouse Gases and Related Tracers Measurements Techniques, Jena, Germany, 2009.; Wofsy, S. C.: HIAPER Pole-to-Pole Observations (HIPPO): fine-grained, global-scale measurements of climatically important atmospheric gases and aerosols, Philos. T. Roy. Soc. A, 369, 2073–2086, 2011.

 

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