A5019704288- Remote Sensing in Agriculture
- Plant Water Relations and Carbon Dynamics
- Atmospheric and Environmental Gas Dynamics
- Water Quality Monitoring and Analysis
- Plant responses to elevated CO2
- Atmospheric Ozone and Climate
- Cryospheric studies and observations
- Remote Sensing and LiDAR Applications
- Land Use and Ecosystem Services
- Species Distribution and Climate Change
- Remote Sensing and Land Use
- Calibration and Measurement Techniques
- Remote-Sensing Image Classification
- Urban Heat Island Mitigation
- Spectroscopy and Chemometric Analyses
- Peatlands and Wetlands Ecology
- Leaf Properties and Growth Measurement
- Climate change and permafrost
- Horticultural and Viticultural Research
- Botany and Plant Ecology Studies
- Forest ecology and management
- Nuclear Physics and Applications
- Space Science and Extraterrestrial Life
- Air Quality Monitoring and Forecasting
- Advanced Chemical Sensor Technologies
Center For Remote Sensing (United States)
2023
University of Zurich
2023
GFZ Helmholtz Centre for Geosciences
2023
University of Milano-Bicocca
2012-2019
University of Milan
2012
Abstract Variations in photosynthesis still cause substantial uncertainties predicting photosynthetic CO 2 uptake rates and monitoring plant stress. Changes actual that are not related to greenness of vegetation difficult measure by reflectance based optical remote sensing techniques. Several activities underway evaluate the sun‐induced fluorescence signal on ground a coarse spatial scale using space‐borne imaging spectrometers. Intermediate‐scale observations airborne‐based spectroscopy,...
Abstract Remote estimation of Sun‐induced chlorophyll fluorescence emitted by terrestrial vegetation can provide an unparalleled opportunity to track spatiotemporal variations photosynthetic efficiency. Here we the first direct experimental evidence that two peaks spectrum be accurately mapped from high‐resolution radiance spectra and signal is linked in actual Red far red measured using a novel airborne imaging spectrometer over grass carpet treated with herbicide known inhibit...
Sun-induced fluorescence (SIF) in the far-red region provides a new noninvasive measurement approach that has potential to quantify dynamic changes light-use efficiency and gross primary production (GPP). However, mechanistic link between GPP SIF is not completely understood. We analyzed structural functional factors controlling emission of at 760 nm (F760 ) Mediterranean grassland manipulated with nutrient addition nitrogen (N), phosphorous (P) or nitrogen-phosphorous (NP). Using...
Remote sensing of sun-induced chlorophyll fluorescence (SIF) has been suggested as a promising approach for probing changes in global terrestrial gross primary productivity (GPP). To date, however, most studies were conducted situations when/where both SIF and GPP driven by large the absorbed photosynthetically active radiation (APAR) phenology. Here we quantified during short-term intense heat wave at Mediterranean pine forest, which APAR negligible. decreased linearly course wave, while...
Changes in snow cover depth and duration predicted by climate change scenarios are expected to strongly affect high-altitude ecosystem processes. This study investigates the effect of an exceptionally short season on phenology carbon dioxide source/sink strength a subalpine grassland. An earlier snowmelt more than one month caused considerable advancement (40 days) beginning uptake period (CUP) and, together with delayed establishment autumn, contributed two-month longer CUP. The combined...
Abstract. This study investigates the performances in a terrestrial ecosystem of gross primary production (GPP) estimation suite spectral vegetation indexes (VIs) that can be computed from currently orbiting platforms. Vegetation were near-surface field spectroscopy measurements collected using an automatic system designed for high temporal frequency acquisition visible near-infrared region. Spectral observations two consecutive years Italy subalpine grassland equipped with eddy covariance...
Due to its close link the photosynthetic process, sun-induced chlorophyll fluorescence (F) opens new possibilities study dynamics of light reactions and quantify CO2 assimilation rates. Although recent studies show that F is linearly related gross primary production (GPP) on coarse spatial temporal scales, it argued this relationship may be mainly driven by seasonal changes in absorbed photochemical active radiation (APAR) less plant use efficiency (LUE). In work a high-resolution...
There is a critical need for sensitive remote sensing approaches to monitor the parameters governing photosynthesis, at temporal scales relevant their natural dynamics. The photochemical reflectance index (PRI) and chlorophyll fluorescence (F) offer strong potential monitoring photosynthesis local, regional, global scales, however relationships between solar induced F (SIF) on diurnal seasonal are not fully understood. This study examines how fine spatial scale SIF observations relate leaf...
Sun-induced fluorescence in the far-red region (SIF) is increasingly used as a remote and proximal-sensing tool capable of tracking vegetation gross primary production (GPP). However, use SIF to probe changes GPP challenged during extreme climatic events, such heatwaves. Here, we examined how 2018 European heatwave (HW) affected GPP-SIF relationship evergreen broadleaved trees with relatively invariant canopy structure. To do so, combined canopy-scale measurements, estimated from an eddy...
Abstract. This study investigates the performances of different optical indices to estimate gross primary production (GPP) herbaceous stratum in a Mediterranean savanna with nitrogen (N) and phosphorous (P) availability. Sun-induced chlorophyll fluorescence yield computed at 760 nm (Fy760), scaled photochemical reflectance index (sPRI), MERIS terrestrial-chlorophyll (MTCI) normalized difference vegetation (NDVI) were from near-surface field spectroscopy measurements collected using high...
The interest of the scientific community on remote observation sun-induced chlorophyll fluorescence (SIF) has increased in recent years. In this context, hyperspectral ground measurements play a crucial role calibration and validation future satellite missions. For reason, European cooperation science technology (COST) Action ES1309 OPTIMISE compiled three papers instrument characterization, measurement setups protocols, retrieval methods (current paper). This study is divided two sections;...
Sun-induced canopy chlorophyll fluorescence in both the red (FR) and far-red (FFR) regions was estimated across a range of temporal scales species from different plant functional types using high resolution radiance spectra collected on ground. Field measurements were with state-of-the-art spectrometer setup standardized methodology. Results showed that characterized by magnitude. In general, highest emissions measured crops followed broadleaf then needleleaf species. Red values generally...
Remote Sensing of Sun-Induced Chlorophyll Fluorescence (SIF) is a research field growing interest because it offers the potential to quantify actual photosynthesis and monitor plant status. New satellite missions from European Space Agency, such as Earth Explorer 8 FLuorescence EXplorer (FLEX) mission—scheduled launch in 2022 aiming at SIF mapping—and National Aeronautics Administration (NASA) Orbiting Carbon Observatory-2 (OCO-2) sampling mission launched July 2014, provide capability...
The most recent efforts to provide remote sensing (RS) estimates of plant function rely on the combination Radiative Transfer Models (RTM) and Soil-Vegetation-Atmosphere (SVAT) models, such as Soil-Canopy Observation Photosynthesis Energy fluxes (SCOPE) model. In this work we used ground spectroradiometric chamber-based CO2 flux measurements in a nutrient manipulated Mediterranean grassland order to: 1) develop multiple-constraint inversion approach SCOPE able retrieve vegetation...
The increasing amount of continuous time series solar-induced fluorescence (SIF) and vegetation indices (e.g. Photochemical Reflectance Index, PRI) acquired with high temporal (sub-minute) frequencies is foreseen to allow tracking the structural physiological changes in a variety ecosystems. Coupled observations CO2, water, energy fluxes from eddy covariance flux towers, these measurements can bring new insights into remote monitoring ecosystem functioning. However, continuously changing...
Abstract. Resolving the spatial and temporal dynamics of gross primary productivity (GPP) terrestrial ecosystems across different scales remains a challenge. Remote sensing is regarded as solution to upscale point observations conducted at ecosystem level, using eddy covariance (EC) technique, landscape global levels. In addition traditional vegetation indices, photochemical reflectance index (PRI) emission solar-induced chlorophyll fluorescence (SIF), now measurable from space, provide new...
Retrieval of Sun-Induced Chlorophyll Fluorescence (F) spectrum is one the challenging perspectives for further advancing F studies towards a better characterization vegetation structure and functioning. In this study, simplified Spectral Fitting retrieval algorithm suitable retrieving with limited number parameters proposed (two F). The novel developed tested on set radiative transfer simulations obtained by coupling SCOPE MODTRAN5 codes, considering different chlorophyll content, leaf area...
The upcoming Fluorescence Explorer (FLEX) satellite mission aims to provide high quality radiometric measurements for subsequent retrieval of sun-induced chlorophyll fluorescence (SIF). combination SIF with other observations stemming from the FLEX/Sentinel-3 tandem holds potential assess complex ecosystem processes. calibration and validation (cal/val) these derived products are central but challenging components mission. This contribution outlines strategies assessment in situ retrieved...
Chlorophyll fluorescence (ChlF) information offers a deep insight into the plant physiological status by reason of close relationship it has with photosynthetic activity. The unmanned aerial systems (UAS)-based assessment solar induced ChlF (SIF) using non-imaging spectrometers and radiance-based retrieval methods, potential to provide spatio-temporal performance at field scale. objective this manuscript is report main advances in development UAS-based methods for SIF through latest...
Growing interest in the proximal sensing of sun-induced chlorophyll fluorescence (SIF) has been boosted by space-based retrievals and up-coming missions such as FLuorescence EXplorer (FLEX). The European COST Action ES1309 “Innovative optical tools for ecophysiological processes” (OPTIMISE, ES1309; https://optimise.dcs.aber.ac.uk/) produced three manuscripts addressing main current challenges this field. This article provides a framework to model impact different instrument noise bias on...
Eutrophic lakes display unpredictable patterns of phytoplankton growth, distribution, vertical and horizontal migration, likely depending on environmental conditions. Monitoring chlorophyll-a (Chl-a) concentration provides reliable information the dynamics primary producers if monitoring is conducted frequently. We present a practical approach that allows continuous Chl-a by using radiometric system measures optical spectral properties water. tested this method in shallow, nutrient-rich lake...