Nick Selmes

ESA Lakes Climate Change Initiative (Lakes_cci): Lake products, Version 3.0

K. Asfour, Beatriz Calmettes, Laura Carrea, Jean-François Crétaux et autres

This dataset contains the Lakes Essential Climate Variable (ECV) Products, comprised of processed satellite observations at the global scale, over the period 1992-2023, for over 2000 inland water bodies. This dataset was produced by the European Space Agency (ESA) Lakes Climate Change …

Colour-informed ecoregion analysis highlights a satellite capability gap for spatially and temporally consistent freshwater cyanobacteria monitoring

Davide Lomeo, Stefan G. H. Simis, Nick Selmes, Anne D. Jungblut et autres

Cyanobacteria blooms pose significant risks to water quality in freshwater ecosystems worldwide, with implications for human and animal health. Constructing consistent records of cyanobacteria dynamics in complex inland waters from satellite imagery remains challenged by discontinuous sensor capabilities, particularly with regard to …

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A novel cyanobacteria occurrence index derived from optical water types in a tropical lake

Davide Lomeo, Stefan G. H. Simis, Xiaohan Liu, Nick Selmes et autres

Cyanobacteria blooms are a threat to water quality of lakes and reservoirs worldwide, requiring scalable monitoring solutions. Existing approaches for remote sensing of cyanobacteria focus on quantifying (accessory) photosynthetic pigment to map surface accumulations. These approaches have proven challenging to validate against …

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Framework for Regional to Global Extension of Optical Water Types for Remote Sensing of Optically Complex Transitional Water Bodies

Elizabeth C. Atwood, Thomas J. Jackson, Angus Laurenson, Bror Fredrik Jönsson et autres

Water quality indicator algorithms often separate marine and freshwater systems, introducing artificial boundaries and artifacts in the freshwater to ocean continuum. Building upon the Ocean Colour- (OC) and Lakes Climate Change Initiative (CCI) projects, we propose an improved tool to assess the …

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Quantifying decadal stability of lake reflectance and chlorophyll-a from medium-resolution ocean color sensors

Xiaohan Liu, Mark Andrew Warren, Nick Selmes, Stefan G. H. Simis

Multi-decadal time-series of Lake Water-Leaving Reflectance (LWLR), part of the Lakes Essential Climate Variable, have typically been interrupted for the 2012–2016 period due to lack of an ocean color sensor with capabilities equivalent to MERIS (2002−2012) and OLCI (2016 - present). Here …

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Spatial structure of in situ reflectance in coastal and inland waters: implications for satellite validation

Thomas Jordan, Stefan G. H. Simis, Nick Selmes, Giulia Sent et autres

Validation of satellite-derived aquatic reflectance involves relating meter-scale in situ observations to satellite pixels with typical spatial resolution ∼ 10–100 m within a temporal “match-up window” of an overpass. Due to sub-pixel variation these discrepancies in measurement scale are a source of …

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Global variability and controls on the accumulation of fallout radionuclides in cryoconite

Caroline Clason, Giovanni Baccolo, Edyta Łokas, Philip N. Owens et autres

The accumulation of fallout radionuclides (FRNs) from nuclear weapons testing and nuclear accidents has been evaluated for over half a century in natural environments; however, until recently their distribution and abundance within glaciers have been poorly understood. Following a series of individual …

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Satellite-derived multivariate world-wide lake physical variable timeseries for climate studies

Laura Carrea, Jean‐François Crétaux, Xiaohan Liu, Yuhao Wu et autres

A consistent dataset of lake surface water temperature, ice cover, water-leaving reflectance, water level and extent is presented. The collection constitutes the Lakes Essential Climate Variable (ECV) for inland waters. The data span combined satellite observations from 1992 to 2020 inclusive and …

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Regional Satellite Algorithms to Estimate Chlorophyll-a and Total Suspended Matter Concentrations in Vembanad Lake

Theenathayalan Varunan, Shubha Sathyendranath, Gemma Kulk, Nandini N. Menon et autres

A growing coastal population is leading to increased anthropogenic pollution that greatly affects coastal and inland water bodies, especially in the tropics. The Sustainable Development Goal-14, ‘Life below water’ emphasises the importance of conservation and sustainable use of the ocean and its …

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Contribution of glaciers to water, energy and food security in mountain regions: current perspectives and future priorities

Caroline Clason, Sally Rangecroft, Philip N. Owens, Edyta Łokas et autres

Abstract Mountain glaciers are crucial sources of fresh water, contributing directly and indirectly to water, energy and food supplies for hundreds of millions of people. Assessing the impact of diminishing glacial meltwater contributions to the security of this resource is critical as …

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Added value of in situ data for Earth observation product validation and improvement. Deliverable report of project H2020 MONOCLE (grant 776480).

Liesbeth De Keukelaere, Peter Hunter, Thomas Jordan, Steef W. M. Peters et autres

Executive Summary This report uses a series of five case studies to demonstrate the added-value of in situ measurements and how these can be used to validate and improve the quality and utility of satellite-derived water quality data products. Five case-studies were …

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Consistency between Satellite Ocean Colour Products under High Coloured Dissolved Organic Matter Absorption in the Baltic Sea

Gavin H. Tilstone, Silvia Pardo, Stefan G. H. Simis, Ping Qin et autres

Ocean colour (OC) remote sensing is an important tool for monitoring phytoplankton in the global ocean. In optically complex waters such as the Baltic Sea, relatively efficient light absorption by substances other than phytoplankton increases product uncertainty. Sentinel-3 OLCI-A, Suomi-NPP VIIRS and …

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