A5034048544- Marine and coastal ecosystems
- Oceanographic and Atmospheric Processes
- Climate variability and models
- Water Quality Monitoring and Analysis
- Aquatic Ecosystems and Phytoplankton Dynamics
- Meteorological Phenomena and Simulations
- Remote Sensing and LiDAR Applications
- Flood Risk Assessment and Management
- Water Quality Monitoring Technologies
- Atmospheric and Environmental Gas Dynamics
- Hydrology and Watershed Management Studies
- Species Distribution and Climate Change
- Plant Water Relations and Carbon Dynamics
- Fish Ecology and Management Studies
- Advanced Image Fusion Techniques
- Computational Fluid Dynamics and Aerodynamics
- Combustion and flame dynamics
- Marine and environmental studies
- Infrared Target Detection Methodologies
- Geology and Paleoclimatology Research
- Coastal and Marine Dynamics
- Urban Heat Island Mitigation
- Remote Sensing in Agriculture
- Advanced Combustion Engine Technologies
- Atmospheric Ozone and Climate
Swiss Federal Institute of Aquatic Science and Technology
2021-2025
University of Zurich
2022-2025
École Polytechnique Fédérale de Lausanne
2014-2019
Sharif University of Technology
2010
Abstract The development of algorithms for remote sensing water quality (RSWQ) requires a large amount in situ data to account the bio-geo-optical diversity inland and coastal waters. GLObal Reflectance community dataset Imaging optical Aquatic environments (GLORIA) includes 7,572 curated hyperspectral reflectance measurements at 1 nm intervals within 350 900 wavelength range. In addition, least one co-located measurement chlorophyll , total suspended solids, absorption by dissolved...
Alplakes is an interactive web application providing open access to operational simulations and remote sensing data for lakes in the European alpine region. The platform combines outputs from various research projects create a digital twin of each lake. Designed with user-friendliness mind, enables wide range users lake models products developed by researchers. Here we focus on three-dimensional hydrodynamic featured Alplakes. project builds previous work Meteolakes, which pioneered...
Lake thermal dynamics provide critical insights into regional and global climate change, play a regulatory role in lake biogeochemical cycles. In situ measurements, remote sensing, hydrodynamic modelling are key sources for monitoring temperature. data essential calibration validation (cal/val) of satellite products numerical models, but often scarce or irregular many lakes. Additionally, assimilation surface water temperature (LSWT) can improve models. Satellite imagery has been widely used...
A two-platform measurement system for realizing airborne thermography of the Lake Surface Water Temperature (LSWT) with ~0.8 m pixel resolution (sub-pixel satellite scale) is presented. It consists a tethered Balloon Launched Imaging and Monitoring Platform (BLIMP) that records LSWT images an autonomously operating catamaran (called ZiviCat) measures in situ surface/near surface temperatures within image area, thus permitting simultaneous ground-truthing BLIMP data. The was equipped uncooled...
Abstract Freshwater algae exhibit complex dynamics, particularly in meso-oligotrophic lakes with sudden and dramatic increases algal biomass following long periods of low background concentration. While the fundamental prerequisites for blooms, namely light nutrient availability, are well-known, their specific causation involves an intricate chain conditions. Here we examine a recent massive Uroglena bloom Lake Geneva (Switzerland/France). We show that certain sequence meteorological...
Abstract The spatiotemporal surface heat flux (SurHF) distribution over Lake Geneva, the largest lake in Western Europe, was estimated for a 7‐year period (2008–2014). Data sources included hourly maps of over‐the‐lake assimilated meteorological data from validated numerical weather model and water temperature (LSWT) satellite imagery. A set bulk algorithms, previously optimized calibrated at two locations used. Results indicate systematic long‐term average spatial range >40 Wm ‐2 between...
Abstract Net Surface Heat Flux (SurHF) was estimated from 2008 to 2014 for Lake Geneva (Switzerland/France), using long‐term temperature depth profiles at two locations, hourly maps of reanalysis meteorological data a numerical weather model and lake surface water temperatures calibrated satellite imagery. Existing formulas different heat flux components were combined into 54 total SurHF models. The coefficients in these models based on optimization. Four calibration factors characterizing...
Water inherent optical properties (IOPs) contain integrative information on the constituents of surface waters. In lakes, IOP measurements have not been traditionally collected. This study describes how high-frequency profiles can be used to document short-term physical and biogeochemical processes that ultimately influence long-term trajectory lake ecosystems. Between October 2018 May 2020, we collected 1373 high-resolution hyperspectral in uppermost 50 m large mesotrophic Lake Geneva...
Abstract. Models are simplified descriptions of reality and intrinsically limited by the assumptions that have been introduced in their formulation. With development automatic calibration toolboxes, finding optimal parameters suit environmental system has become more convenient. Here, we explore how optimization toolboxes can be applied innovatively to uncover flaws physical formulations models. We illustrate this approach evaluating effect simplifications embedded formulation a widely used...
Abstract The dynamics of spatial heterogeneity lake surface water temperature (LSWT) at subpixel satellite scale O(1 m) and its effect on the cooling estimation typical pixel areas km 2 ) were investigated using an airborne platform. measurements provide maps that revealed LSWT variability with unprecedented detail. cold season data did not show significant hence no variability. However, based three selected daytime subpixel‐scale maps, patterns showed a >2 °C in spring >3.5 summer,...
Two complementary measurement systems-built upon an autonomous floating craft and a tethered balloon-for lake research monitoring are presented. The vehicle was assembled on catamaran for stability, is capable of handling variety instrumentation in situ near-surface measurements. hulls, each equipped with small electric motor, support rigid decks arranging equipment. An generator provides full autonomy about 8 h. modular power supply data management systems housed two boxes, which enable...
Quantum yield of fluorescence (ϕF) is key to interpret remote measurements sun-induced (SIF), and whether the SIF signal governed by photochemical quenching (PQ) or non-photochemical (NPQ). Disentangling PQ from NPQ allows using estimates in various applications aquatic optics. However, obtaining ϕF challenging due its high temporal physiological variability, combined needed enclose all relevant optical paths. In inland waters, this type data scarce information on diurnal seasonal dynamics...
Sun-induced fluorescence (SIF) emission can be used as a proxy for chlorophyll-a concentration (chl a) and an indicator of phytoplankton physiological status. However, retrieving interpreting the SIF signal is challenging due to factors, optical properties atmosphere water body, instrumental effects, assumptions inherent retrieval schemes. Due complexity factors determining occurrence, lack measurement protocols few studies on methods, its exploitation remains limited, especially in lakes....
We present an optical closure exercise using in situ hyperspectral radiometry and Inherent Optical Property (IOP) measurements acquired Lake Geneva, (Switzerland/France). The dataset includes 294 high-resolution profiles for the period between 10/2018 5/2020. Hydrolight was used to simulate remote sensing reflectance (Rrs) from measured IOPs. comparison with R <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">rs</inf> carried out under six...