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000901828 005__ 20211025171513.0
000901828 0247_ $$2doi$$a10.5194/bg-18-621-2021
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000901828 1001_ $$0P:(DE-HGF)0$$aPisek, Jan$$b0$$eCorresponding author
000901828 245__ $$aRetrieval and validation of forest background reflectivity from daily Moderate Resolution Imaging Spectroradiometer (MODIS) bidirectional reflectance distribution function (BRDF) data across European forests
000901828 260__ $$aKatlenburg-Lindau [u.a.]$$bCopernicus$$c2021
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000901828 520__ $$aInformation about forest background reflectance is needed for accurate biophysical parameter retrieval from forest canopies (overstory) with remote sensing. Separating under- and overstory signals would enable more accurate modeling of forest carbon and energy fluxes. We retrieved values of the normalized difference vegetation index (NDVI) of the forest understory with the multi-angular Moderate Resolution Imaging Spectroradiometer (MODIS) bidirectional reflectance distribution function (BRDF)/albedo data (gridded 500 m daily Collection 6 product), using a method originally developed for boreal forests. The forest floor background reflectance estimates from the MODIS data were compared with in situ understory reflectance measurements carried out at an extensive set of forest ecosystem experimental sites across Europe. The reflectance estimates from MODIS data were, hence, tested across diverse forest conditions and phenological phases during the growing season to examine their applicability for ecosystems other than boreal forests. Here we report that the method can deliver good retrievals, especially over different forest types with open canopies (low foliage cover). The performance of the method was found to be limited over forests with closed canopies (high foliage cover), where the signal from understory becomes too attenuated. The spatial heterogeneity of individual field sites and the limitations and documented quality of the MODIS BRDF product are shown to be important for the correct assessment and validation of the retrievals obtained with remote sensing.
000901828 536__ $$0G:(DE-HGF)POF4-2173$$a2173 - Agro-biogeosystems: controls, feedbacks and impact (POF4-217)$$cPOF4-217$$fPOF IV$$x0
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000901828 7001_ $$0P:(DE-HGF)0$$aErb, Angela$$b1
000901828 7001_ $$00000-0002-9352-0114$$aKorhonen, Lauri$$b2
000901828 7001_ $$00000-0001-8538-1495$$aBiermann, Tobias$$b3
000901828 7001_ $$0P:(DE-HGF)0$$aCarrara, Arnaud$$b4
000901828 7001_ $$00000-0002-6708-8532$$aCremonese, Edoardo$$b5
000901828 7001_ $$00000-0002-5966-1829$$aCuntz, Matthias$$b6
000901828 7001_ $$00000-0002-1990-0928$$aFares, Silvano$$b7
000901828 7001_ $$00000-0002-5352-3222$$aGerosa, Giacomo$$b8
000901828 7001_ $$00000-0003-2263-0073$$aGrünwald, Thomas$$b9
000901828 7001_ $$00000-0002-3342-9239$$aHase, Niklas$$b10
000901828 7001_ $$aHeliasz, Michal$$b11
000901828 7001_ $$00000-0002-1341-921X$$aIbrom, Andreas$$b12
000901828 7001_ $$00000-0002-7615-8870$$aKnohl, Alexander$$b13
000901828 7001_ $$aKobler, Johannes$$b14
000901828 7001_ $$00000-0002-6186-1731$$aKruijt, Bart$$b15
000901828 7001_ $$00000-0001-7099-8740$$aLange, Holger$$b16
000901828 7001_ $$00000-0003-1605-8306$$aLeppänen, Leena$$b17
000901828 7001_ $$aLimousin, Jean-Marc$$b18
000901828 7001_ $$00000-0002-3351-9023$$aSerrano, Francisco Ramon Lopez$$b19
000901828 7001_ $$aLoustau, Denis$$b20
000901828 7001_ $$aLukeš, Petr$$b21
000901828 7001_ $$aLundin, Lars$$b22
000901828 7001_ $$00000-0001-5946-9530$$aMarzuoli, Riccardo$$b23
000901828 7001_ $$00000-0001-6767-3195$$aMölder, Meelis$$b24
000901828 7001_ $$00000-0003-2957-9071$$aMontagnani, Leonardo$$b25
000901828 7001_ $$0P:(DE-HGF)0$$aNeirynck, Johan$$b26
000901828 7001_ $$00000-0002-9940-5846$$aPeichl, Matthias$$b27
000901828 7001_ $$00000-0002-8665-0375$$aRebmann, Corinna$$b28
000901828 7001_ $$0P:(DE-HGF)0$$aRubio, Eva$$b29
000901828 7001_ $$0P:(DE-HGF)0$$aSantos-Reis, Margarida$$b30
000901828 7001_ $$0P:(DE-HGF)0$$aSchaaf, Crystal$$b31
000901828 7001_ $$0P:(DE-Juel1)144420$$aSchmidt, Marius$$b32
000901828 7001_ $$0P:(DE-HGF)0$$aSimioni, Guillaume$$b33
000901828 7001_ $$00000-0002-3468-5648$$aSoudani, Kamel$$b34
000901828 7001_ $$0P:(DE-HGF)0$$aVincke, Caroline$$b35
000901828 773__ $$0PERI:(DE-600)2158181-2$$a10.5194/bg-18-621-2021$$gVol. 18, no. 2, p. 621 - 635$$n2$$p621 - 635$$tBiogeosciences$$v18$$x1726-4189$$y2021
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