Articles | Volume 13, issue 8
Research article
14 Aug 2020
Research article |  | 14 Aug 2020

Improved SIFTER v2 algorithm for long-term GOME-2A satellite retrievals of fluorescence with a correction for instrument degradation

Erik van Schaik, Maurits L. Kooreman, Piet Stammes, L. Gijsbert Tilstra, Olaf N. E. Tuinder, Abram F. J. Sanders, Willem W. Verstraeten, Rüdiger Lang, Alessandra Cacciari, Joanna Joiner, Wouter Peters, and K. Folkert Boersma

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Cited articles

Azam, F. and Richter, A.: GOME-2 on MetOp-B Follow-on analysis of GOME2 in orbit degradation, Final Report EUM/CO/09/4600000696/RM, EUMETSAT, available at: (last access: 8 June 2020), 2015. 
Baker N. R. and Oxborough K.: Chlorophyll Fluorescence as a Probe of Photosynthetic Productivity, in: Chlorophyll a Fluorescence. Advances in Photosynthesis and Respiration, vol. 19, edited by: Papageorgiou G. C., Govindjee, Springer, Dordrecht,, 2004. 
Beirle, S., Lampel, J., Lerot, C., Sihler, H., and Wagner, T.: Parameterizing the instrumental spectral response function and its changes by a super-Gaussian and its derivatives, Atmos. Meas. Tech., 10, 581–598,, 2017. 
Berrisford, Dee, D. P., Poli, P., Brugge, R., Fielding, K., Fuentes, M., Kållberg, P. W., Kobayashi, S., Uppala, S., and Simmons, A.: The ERA-Interim archive Version 2.0. ERA Report, ECMWF, Shinfield Park, Reading, available at: (last access: 11 August 2020), 2011. 
Botia, S.: Importance of Surface Pressure and Albedo for retrieving Sun Induced Chlorophyll Fluorescence from GOME-2, Internship Report, Royal Netherlands Meteorological Institute and Wageningen University, Wageningen, the Netherlands, 39 pp., 2017. 
Short summary
With our improved algorithm we have generated a stable, long-term dataset of fluorescence measurements from the GOME-2A satellite instrument. In this study we determined a correction for the degradation of GOME-2A in orbit and applied this correction along with other improvements to our SIFTER v2 retrieval algorithm. The result is a coherent dataset of daily and monthly averaged fluorescence values for the period 2007–2018 to track worldwide changes in photosynthetic activity by vegetation.