Articles | Volume 8, issue 9
https://doi.org/10.5194/amt-8-3715-2015
https://doi.org/10.5194/amt-8-3715-2015
Research article
 | 
16 Sep 2015
Research article |  | 16 Sep 2015

Pointing errors in solar absorption spectrometry – correction scheme and its validation

A. Reichert, P. Hausmann, and R. Sussmann

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Cited articles

Adrian, G. P., Baumann, M., Blumenstock, T., Fischer, H., Friedle, A., Gerhardt, L., Maucher, G., Oelhaf, H., Scheuerpflug, W., Thomas, P., Trieschmann, O., and Wegner, A.: First results of ground-based FTIR measurements of atmospheric trace gases in North Sweden and Greenland during EASOE, Geophys. Res. Lett., 21, 1343–1346, 1994.
Borsdorff, T. and Sussmann, R.: On seasonality of stratomesospheric CO above midlatitudes: new insight from solar FTIR spectrometry at Zugspitze and Garmisch, Geophys. Res. Lett., 36, L21804, https://doi.org/10.1029/2009GL040056, 2009.
Giles, P. M.: Time-Distance Measurements of Large-Scale Flows in the Solar Convection Zone, PhD thesis, Stanford University, CA, USA, 2000.
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, https://doi.org/10.5194/amt-4-47-2011, 2011.
Gardiner, T., Forbes, A., de Mazière, M., Vigouroux, C., Mahieu, E., Demoulin, P., Velazco, V., Notholt, J., Blumenstock, T., Hase, F., Kramer, I., Sussmann, R., Stremme, W., Mellqvist, J., Strandberg, A., Ellingsen, K., and Gauss, M.: Trend analysis of greenhouse gases over Europe measured by a network of ground-based remote FTIR instruments, Atmos. Chem. Phys., 8, 6719–6727, https://doi.org/10.5194/acp-8-6719-2008, 2008.
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Short summary
A method for quantification of sun-pointing inaccuracies in solar absorption spectrometry is presented along with a correction scheme for the resulting errors in trace gas vertical column or profile retrievals. The mispointing is constrained by combining subsequent measurements of solar line shifts with differing orientations of the solar rotation axis relative to the zenith direction. The implementation and benefits of the method are demonstrated using the Zugspitze XCH4 measurements.