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A Method to Correct Sampling Ghosts in Historic Near-infrared Fourier Transform Spectrometer (Fts) Measurements : Volume 6, Issue 2 (12/04/2013)

By Dohe, S.

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Book Id: WPLBN0003993161
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: A Method to Correct Sampling Ghosts in Historic Near-infrared Fourier Transform Spectrometer (Fts) Measurements : Volume 6, Issue 2 (12/04/2013)  
Author: Dohe, S.
Volume: Vol. 6, Issue 2
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Sherlock, V., Hase, F., Gisi, M., Sepúlveda, E., Dohe, S., Robinson, J.,...Blumenstock, T. (2013). A Method to Correct Sampling Ghosts in Historic Near-infrared Fourier Transform Spectrometer (Fts) Measurements : Volume 6, Issue 2 (12/04/2013). Retrieved from http://ebook.worldlibrary.net/


Description
Description: Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research (IMK-ASF), Karlsruhe, Germany. The Total Carbon Column Observing Network (TCCON) has been established to provide ground-based remote sensing measurements of the column-average dry air mole fractions of key greenhouse gases. To ensure the network wide consistency, biases between Fourier Transform spectrometers at different sites have to be well controlled. In this study we investigate a fundamental correction scheme for errors in the sampling of the interferogram. This is a two-step procedure in which the laser sampling error (LSE) is quantified using a subset of suitable interferograms and then used to resample all the interferograms in the timeseries. Timeseries of measurements acquired at the TCCON sites Izaña and Lauder are used to demonstrate the method. At both sites the sampling error histories show changes in LSE due to instrument interventions. Estimated LSE are in good agreement with sampling errors inferred from lamp measurements of the ghost to parent ratio (Lauder). The LSE introduce retrieval biases which are minimised when the interferograms are resampled. The original timeseries of Xair and XCO2 at both sites show discrepancies of 0.2–0.5% due to changes in the LSE associated with instrument interventions or changes in the measurement sample rate. After resampling discrepancies are reduced to 0.1% at Lauder and 0.2% at Izaña. In the latter case, coincident changes in interferometer alignment may also contribute to the residual difference.

Summary
A method to correct sampling ghosts in historic near-infrared Fourier Transform Spectrometer (FTS) measurements

Excerpt
Dohe, S., Hase, F., Gisi, M., and Blumenstock, T.: Progress on GFIT/PROFFIT intercomparison, {P}resentation at the 2012 TCCON Meeting, Wengen, Switzerland, 2012.; Gisi, M., Hase, F., Dohe, S., and Blumenstock, T.: Camtracker: a new camera controlled high precision solar tracker system for FTIR-spectrometers, Atmos. Meas. Tech., 4, 47–54, doi:10.5194/amt-4-47-2011, 2011.; Guelachvili, G.: Spectrometric Techniques, chap. 1. Distortions in Fourier spectra and diagnosis, Academic Press, 1–61, 1981.; Griffith, D., Jones, N., McNamara, B., Paton-Walsh, C., Bell, W., and Bernardo, C.: Intercomparison of ground-based solar FTIR measurements of atmospheric gases at Lauder, New Zealand, J. Atmos. Ocean. Tech., 20, 1138–1153, 2003.; Hase, F., Blumenstock, T., and Paton-Walsh, C.: Analysis of the instrumental line shape of high-resolution F}ourier {T}ransform {IR spectrometers with gas cell measurements and new retrieval software, Appl. Optics, 38, 3417–3422, 1999.; Hase, F., Hannigan, J., Coffey, M., Goldman, A., Hopfner, M., Jones, N., Rinsland, C., and Wood, S.: Intercomparison of retrieval codes used for the analysis of high-resolution, ground-based FTIR measurements, J. Quant. Spectrosc. Ra., 87, 25–52, doi:10.1016/j.jqsrt.2003.12.008, 2004.; Keppel-Aleks, G., Toon, G., Wennberg, P., and Deutscher, N.: Reducing the impact of source brightness fluctuations on spectra obtained by Fourier-transform spectrometry, Appl. Optics, 46, 4774–4779, 2007.; Learner, R., Thorne, A., and Brault, J.: Ghosts and artifacts in {F}ourier-{T}ransform spectrometry, Appl. Optics, 35, 2947–2954, 1996.; Messerschmidt, J., Macatangay, R., Notholt, J., Petri, C., Warneke, T., and Weinzierl, C.: Side by side measurements of {CO}2 by ground-based {F}ourier transform spectrometry ({FTS}), Tellus B, 62, 749–758, doi:10.1111/j.1600-0889.2010.00491.x, 2010.; Messerschmidt, J., Geibel, M. C., Blumenstock, T., Chen, H., Deutscher, N. M., Engel, A., Feist, D. G., Gerbig, C., Gisi, M., Hase, F., Katrynski, K., Kolle, O., Lavrič, J. V., Notholt, J., Palm, M., Ramonet, M., Rettinger, M., Schmidt, M., Sussmann, R., Toon, G. C., Truong, F., Warneke, T., Wennberg, P. O., Wunch, D., and Xueref-Remy, I.: Calibration of TCCON column-averaged CO2: the first aircraft campaign over European TCCON sites, Atmos. Chem. Phys., 11, 10765–10777, doi:10.5194/acp-11-10765-2011, 2011.; Sherlock, V., Messerschmidt, J., and Hase, F.: Ghost working group update 17 January 2011, {I}nternal TCCON technical report, available on request, 2011.; WMO: Global Atmosphere Watch, GAW Report No. 194, WMO TD No. 1553, 15th WMO/IAEA Meeting of Experts on Carbon Dioxide, 7–10 September 2009, Jena, Germany, 330 pp., 2011.; Wunch, D., Toon, G., Blavier, J.-F., Notholt, R. W. J., Connor, B., Griffith, D., Sherlock, V., and Wennberg, P.: The Total Carbon Column Observing Network, Philos. T. Roy. Soc. A, 369, 2087–2112, doi:10.1098/rsta.2010.0240, 2011.

 

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