{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,9]],"date-time":"2026-04-09T09:12:50Z","timestamp":1775725970675,"version":"3.50.1"},"reference-count":54,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2016,7,8]],"date-time":"2016-07-08T00:00:00Z","timestamp":1467936000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","award":["SFB\/Transregio TR-32: \u201cPatterns in Soil-Vegetation-Atmosphere Systems: Monitoring, Modelling, and Data Assimilation\u201d"],"award-info":[{"award-number":["SFB\/Transregio TR-32: \u201cPatterns in Soil-Vegetation-Atmosphere Systems: Monitoring, Modelling, and Data Assimilation\u201d"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Swiss University Conference","award":["Swiss Earth Observatory Network (SEON)"],"award-info":[{"award-number":["Swiss Earth Observatory Network (SEON)"]}]},{"DOI":"10.13039\/501100002347","name":"Bundesministerium f\u00fcr Bildung und Forschung","doi-asserted-by":"publisher","award":["01LN1313A"],"award-info":[{"award-number":["01LN1313A"]}],"id":[{"id":"10.13039\/501100002347","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Sun-induced chlorophyll fluorescence (F) is a novel remote sensing parameter providing an estimate of actual photosynthetic rates. A combination of this new observable and Monteith\u2019s light use efficiency (LUE) concept was suggested for an advanced modeling of gross primary productivity (GPP). In this demonstration study, we evaluate the potential of both F and the more commonly used photochemical reflectance index (PRI) to approximate the LUE term in Monteith\u2019s equation and eventually improve the forward modeling of GPP diurnals. Both F and the PRI were derived from ground and airborne based spectrometer measurements over two different crops. We demonstrate that approximating dynamic changes of LUE using F and PRI significantly improves the forward modeling of GPP diurnals. Especially in sugar beet, a changing photosynthetic efficiency during the day was traceable with F and incorporating F in the forward modeling significantly improved the estimation of GPP. Airborne data were projected to produce F and PRI maps for winter wheat and sugar beet fields over the course of one day. We detected a significant variability of both, F and the PRI within one field and particularly between fields. The variability of F and PRI was higher in sugar beet, which also showed a physiological down-regulation of leaf photosynthesis. Our results underline the potential of F to serve as a superior indicator for the actual efficiency of the photosynthetic machinery, which is linked to physiological responses of vegetation.<\/jats:p>","DOI":"10.3390\/rs8070574","type":"journal-article","created":{"date-parts":[[2016,7,8]],"date-time":"2016-07-08T09:46:07Z","timestamp":1467971167000},"page":"574","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":48,"title":["Combining Sun-Induced Chlorophyll Fluorescence and Photochemical Reflectance Index Improves Diurnal Modeling of Gross Primary Productivity"],"prefix":"10.3390","volume":"8","author":[{"given":"Anke","family":"Schickling","sequence":"first","affiliation":[{"name":"Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum J\u00fclich GmbH, Wilhelm-Johnen Stra\u00dfe, J\u00fclich 52428, Germany"}]},{"given":"Maria","family":"Matveeva","sequence":"additional","affiliation":[{"name":"Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum J\u00fclich GmbH, Wilhelm-Johnen Stra\u00dfe, J\u00fclich 52428, Germany"}]},{"given":"Alexander","family":"Damm","sequence":"additional","affiliation":[{"name":"Remote Sensing Laboratories, University of Zurich, Winterthurerstrasse 190, Zurich 8057, Switzerland"}]},{"given":"Jan","family":"Schween","sequence":"additional","affiliation":[{"name":"Institute of Geophysics and Meteorology, University of Cologne, Z\u00fclpicher Str. 49, K\u00f6ln 50674, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8948-1928","authenticated-orcid":false,"given":"Andreas","family":"Wahner","sequence":"additional","affiliation":[{"name":"Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum J\u00fclich GmbH, Wilhelm-Johnen Stra\u00dfe, J\u00fclich 52428, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4870-7622","authenticated-orcid":false,"given":"Alexander","family":"Graf","sequence":"additional","affiliation":[{"name":"Institute of Bio- and Geosciences, IBG-3: Agrosphere, Forschungszentrum J\u00fclich GmbH, Wilhelm-Johnen Stra\u00dfe, J\u00fclich 52428, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1251-5805","authenticated-orcid":false,"given":"Susanne","family":"Crewell","sequence":"additional","affiliation":[{"name":"Institute of Geophysics and Meteorology, University of Cologne, Z\u00fclpicher Str. 49, K\u00f6ln 50674, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9993-4588","authenticated-orcid":false,"given":"Uwe","family":"Rascher","sequence":"additional","affiliation":[{"name":"Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum J\u00fclich GmbH, Wilhelm-Johnen Stra\u00dfe, J\u00fclich 52428, Germany"}]}],"member":"1968","published-online":{"date-parts":[[2016,7,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"831","DOI":"10.1038\/ngeo689","article-title":"Trends in the sources and sinks of carbon dioxide","volume":"2","author":"Raupach","year":"2009","journal-title":"Nat. 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