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Tagliabue, Giulia,Panigada, Cinzia,Dechant, Benjamin,Baret, Fré,dé,ric,Cogliati, Sergio,Colombo, Roberto,Migliavacca, Mirco,Rademske, Patrick,Schickling, Anke,Schü,ttemeyer, Dirk,Verre Elsevier 2019 Remote sensing of environment Vol.231 No.-
<P><B>Abstract</B></P> <P>Terrestrial gross primary productivity (GPP) plays an essential role in the global carbon cycle, but the quantification of the spatial and temporal variations in photosynthesis is still largely uncertain. Our work aimed to investigate the potential of remote sensing to provide new insights into plant photosynthesis at a fine spatial resolution. This goal was achieved by exploiting high-resolution images acquired with the FLuorescence EXplorer (FLEX) airborne demonstrator <I>HyPlant</I>. The sensor was flown over a mixed forest, and the images collected were elaborated to obtain two independent indicators of plant photosynthesis. First, maps of sun-induced chlorophyll fluorescence (F), a novel indicator of plant photosynthetic activity, were successfully obtained at both the red and far-red peaks (r<SUP>2</SUP> = 0.89 and <I>p</I> < 0.01, r<SUP>2</SUP> = 0.77 and p < 0.01, respectively, compared to top-of-canopy ground-based measurements acquired synchronously with the overflight) over the forested study area. Second, maps of GPP and absorbed photosynthetically active radiation (APAR) were derived using a customised version of the coupled biophysical model Breathing Earth System Simulator (BESS). The model was driven with airborne-derived maps of key forest traits (i.e., leaf chlorophyll content (LCC) and leaf area index (LAI)) and meteorological data providing a high-resolution snapshot of the variables of interest across the study site. The LCC and LAI were accurately estimated (RMSE = 5.66 μg cm<SUP>−2</SUP> and RMSE = 0.51 m<SUP>2</SUP> m<SUP>−2</SUP>, respectively) through an optimised Look-Up-Table-based inversion of the PROSPECT-4-INFORM radiative transfer model, ensuring the accurate representation of the spatial variation of these determinants of the ecosystem's functionality. The spatial relationships between the measured F and modelled BESS outputs were then analysed to interpret the variability of ecosystem functioning at a regional scale. The results showed that far-red F is significantly correlated with the GPP (r<SUP>2</SUP> = 0.46, <I>p</I> < 0.001) and APAR (r<SUP>2</SUP> = 0.43, p < 0.001) in the spatial domain and that this relationship is nonlinear. Conversely, no statistically significant relationships were found between the red F and the GPP or APAR (<I>p</I> > 0.05). The spatial relationships found at high resolution provide valuable insight into the critical role of spatial heterogeneity in controlling the relationship between the far-red F and the GPP, indicating the need to consider this heterogeneity at a coarser resolution.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High-resolution LCC and LAI maps were obtained from <I>HyPlant</I> through RTM inversion. </LI> <LI> High-resolution GPP and APAR maps were obtained driving BESS with <I>HyPlant</I> data. </LI> <LI> High-resolution F<SUB>687</SUB> and F<SUB>760</SUB> maps were obtained from <I>HyPlant</I> using SFM in a forest. </LI> <LI> F<SUB>687</SUB> showed a non-significant relation with GPP and APAR in the spatial domain. </LI> <LI> F<SUB>760</SUB> showed a positive nonlinear relation with GPP and APAR in the spatial domain. </LI> </UL> </P>
Digital Soil Mapping by Hyperspectral Imagery for Environmental Modelling in Mediterranean Regions
Lagacherie, P.,Gomez, C.,Bacha, S.,Ben Mechlia, M.,Baret, F.,Blanca, Y.,Coulouma,Derouiche, M.G.,Follain, S.,Hamrouni, H.,Jacob, F.,Le Bissonnais, Y.,Le Martret, H.,Masmoudi, M.M.,McBratney, A.B.,Mina 한국토양비료학회 2009 한국토양비료학회 학술발표회 초록집 Vol.2009 No.10
Albert, A.,André,, M.,Anghinolfi, M.,Ardid, M.,Aubert, J.-J.,Aublin, J.,Avgitas, T.,Baret, B.,Barrios-Martí,, J.,Basa, S.,Belhorma, B.,Bertin, V.,Biagi, S.,Bormuth, R.,Bourret, S.,Bouwhuis American Astronomical Society 2017 ASTROPHYSICAL JOURNAL LETTERS - Vol.850 No.2
<P>The Advanced LIGO and Advanced Virgo observatories recently discovered gravitational waves from a binary neutron star inspiral. A short gamma-ray burst (GRB) that followed the merger of this binary was also recorded by the Fermi Gamma-ray Burst Monitor (Fermi-GBM), and the Anti-Coincidence Shield for the Spectrometer for the International Gamma-Ray Astrophysics Laboratory (INTEGRAL), indicating particle acceleration by the source. The precise location of the event was determined by optical detections of emission following the merger. We searched for high-energy neutrinos from the merger in the GeV-EeV energy range using the ANTARES, IceCube, and Pierre Auger Observatories. No neutrinos directionally coincident with the source were detected within +/- 500 s around the merger time. Additionally, no MeV neutrino burst signal was detected coincident with the merger. We further carried out an extended search in the direction of the source for high-energy neutrinos within the 14 day period following the merger, but found no evidence of emission. We used these results to probe dissipation mechanisms in relativistic outflows driven by the binary neutron star merger. The non-detection is consistent with model predictions of short GRBs observed at a large off-axis angle.</P>
Adriá,n-Martí,nez, S.,Albert, A.,André,, M.,Anton, G.,Ardid, M.,Aubert, J.-J.,Baret, B.,Barrios-Martí,, J.,Basa, S.,Bertin, V.,Biagi, S.,Bormuth, R.,Bouwhuis, M. C.,Bruijn, R. American Astronomical Society 2016 The Astrophysical journal Vol.823 No.1
<P>We present the results of searches for point-like sources of neutrinos based on the first combined analysis of data from both the ANTARES and IceCube neutrino telescopes. The combination of both detectors, which differ in size and location, forms a window in the southern sky where the sensitivity to point sources improves by up to a factor of 2 compared with individual analyses. Using data recorded by ANTARES from 2007 to 2012, and by IceCube from 2008 to 2011, we search for sources of neutrino emission both across the southern sky and from a preselected list of candidate objects. No significant excess over background has been found in these searches, and flux upper limits for the candidate sources are presented for E-2.5 and E-2 power-law spectra with different energy cut-offs.</P>
Albert, A.,André,, M.,Anghinolfi, M.,Anton, G.,Ardid, M.,Aubert, J.-J.,Avgitas, T.,Baret, B.,Barrios-Martí,, J.,Basa, S.,Bertin, V.,Biagi, S.,Bormuth, R.,Bourret, S.,Bouwhuis, M. C.,Bruijn American Physical Society 2017 Physical review. D Vol.96 No.2
<P>The Advanced LIGO observatories detected gravitational waves from two binary black hole mergers during their first observation run (O1). We present a high-energy neutrino follow-up search for the second gravitational wave event, GW151226, as well as for gravitational wave candidate LVT151012. We find two and four neutrino candidates detected by IceCube, and one and zero detected by ANTARES, within +/- 500 s around the respective gravitational wave signals, consistent with the expected background rate. None of these neutrino candidates are found to be directionally coincident with GW151226 or LVT151012. We use nondetection to constrain isotropic-equivalent high-energy neutrino emission from GW151226, adopting the GW event's 3D localization, to less than 2 x 10(51)-2 x 10(54) erg.</P>
High-energy neutrino follow-up search of gravitational wave event GW150914 with ANTARES and IceCube
Adriá,n-Martí,nez, S.,Albert, A.,André,, M.,Anghinolfi, M.,Anton, G.,Ardid, M.,Aubert, J.-J.,Avgitas, T.,Baret, B.,Barrios-Martí,, J.,Basa, S.,Bertin, V.,Biagi, S.,Bormuth, R. American Physical Society 2016 Physical Review D Vol.93 No.12
<P>We present the high-energy-neutrino follow-up observations of the first gravitational wave transient GW150914 observed by the Advanced LIGO detectors on September 14, 2015. We search for coincident neutrino candidates within the data recorded by the IceCube and ANTARES neutrino detectors. A possible joint detection could be used in targeted electromagnetic follow-up observations, given the significantly better angular resolution of neutrino events compared to gravitational waves. We find no neutrino candidates in both temporal and spatial coincidence with the gravitational wave event. Within +/- 500 s of the gravitational wave event, the number of neutrino candidates detected by IceCube and ANTARES were three and zero, respectively. This is consistent with the expected atmospheric background, and none of the neutrino candidates were directionally coincident with GW150914. We use this nondetection to constrain neutrino emission from the gravitational-wave event.</P>