Explanipedia

Predicting photosynthesis–irradiance relationships from satellite remote‐sensing observations Open

Gregory L. Britten, Bror Jönsson, Gemma Kulk, Heather A. Bouman, Michael J. Follows , et al. · 2025

Photosynthesis–irradiance (PI) relationships are important for phytoplankton ecology and quantifying carbon fixation rates in the environment. However, the parameters of PI relationships are typically unknown across space and time. Here we…

Sensing human health from Space: An assessment of applications and big data platforms Open

Dhritiraj Sengupta, Filipe Brandão, Shubha Sathyendranath, Gemma Kulk, Annamaria Conte , et al. · 2025

Decadal and spatially complete global surface chlorophyll-a data record from satellite and BGC-Argo observations Open

Daniel J. Ford, Gemma Kulk, Shubha Sathyendranath, Jamie D. Shutler · 2025

Decadal-scale satellite-based climate data records of chlorophyll-a (chl-a), an essential climate variable, are now readily available at high accuracy and precision. These data are being extensively used for research and, increasingly, for…

Supplementary material to "Decadal and spatially complete global surface chlorophyll-a data record from satellite and BGC-Argo observations" Open

Daniel J. Ford, Gemma Kulk, Shubha Sathyendranath, Jamie D. Shutler · 2025

A machine learning model-based satellite data record of dissolved organic carbon concentration in surface waters of the global open ocean Open

Marko Laine, Gemma Kulk, Bror Jönsson, Shubha Sathyendranath · 2024

Dissolved Organic Carbon (DOC) is the largest organic carbon pool in the ocean. Considering the biotic and abiotic factors controlling DOC processes, indirect satellite methods for open ocean DOC estimation can be developed, using conceptu…

Comparison of ocean-colour algorithms for particulate organic carbon in global ocean Open

Christina Eunjin Kong, Shubha Sathyendranath, T. J. Jackson, Dariusz Stramski, Robert J. W. Brewin , et al. · 2024

In the oceanic surface layer, particulate organic carbon (POC) constitutes the biggest pool of particulate material of biological origin, encompassing phytoplankton, zooplankton, bacteria, and organic detritus. POC is of general interest i…

Correction: Ocean Biology Studied from Space Open

Shubha Sathyendranath, Robert J. W. Brewin, Stefano Ciavatta, T. J. Jackson, Gemma Kulk , et al. · 2023

Using Multi-Spectral Remote Sensing for Flood Mapping: A Case Study in Lake Vembanad, India Open

Gemma Kulk, Shubha Sathyendranath, Trevor Platt, Grinson George, Anagha Kunhimuthappan Suresan , et al. · 2023

Water is an essential natural resource, but increasingly water also forms a threat to the human population, with floods being the most common natural disaster worldwide. Earth Observation has the potential for developing cost-effective met…

Ocean Biology Studied from Space Open

Shubha Sathyendranath, Robert J. W. Brewin, Stefano Ciavatta, T. J. Jackson, Gemma Kulk , et al. · 2023

Review of algorithms estimating export production from satellite derived properties Open

Bror Jönsson, Gemma Kulk, Shubha Sathyendranath · 2023

Whereas the vertical transport of biomass from productive surface waters to the deep ocean (the biological pump) is a critical component of the global carbon cycle, its magnitude and variability is poorly understood. Global-scale estimates…

Using Probability Density Functions to Evaluate Models (PDFEM, v1.0) to compare a biogeochemical model with satellite-derived chlorophyll Open

Bror Jönsson, Christopher L. Follett, Jacob Bien, Stephanie Dutkiewicz, Sangwon Hyun , et al. · 2023

Global biogeochemical ocean models are invaluable tools to examine how physical, chemical, and biological processes interact in the ocean. Satellite-derived ocean color properties, on the other hand, provide observations of the surface oce…

Ocean carbon from space: Current status and priorities for the next decade Open

Robert J. W. Brewin, Shubha Sathyendranath, Gemma Kulk, Marie‐Hélène Rio, Javier A. Concha , et al. · 2023

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

Theenathayalan Varunan, Shubha Sathyendranath, Gemma Kulk, Nandini Menon, Grinson George , et al. · 2022

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…

Using Probability Density Functions to Evaluate Models (PDFEM, v1.0) to compare a biogeochemical model with satellite derived chlorophyll Open

Bror Jönsson, Christopher L. Follett, Jacob Bien, Stephanie Dutkiewicz, Sangwon Hyun , et al. · 2022

Global biogeochemical ocean models are invaluable tools to examine how physical, chemical, and biological processes interact in the ocean. Satellite-derived ocean-color properties, on the other hand, provide observations of the surface oce…

Space-based Earth observation in support of the UNFCCC Paris Agreement Open

Michaela I. Hegglin, Ana Bastos, H. Bovensmann, Michael Buchwitz, Dominic Fawcett , et al. · 2022

Space-based Earth observation (EO), in the form of long-term climate data records, has been crucial in the monitoring and quantification of slow changes in the climate system—from accumulating greenhouse gases (GHGs) in the atmosphere, inc…

Ocean mover’s distance: using optimal transport for analysing oceanographic data Open

Sangwon Hyun, Aditya K. Mishra, Christopher L. Follett, Bror Jönsson, Gemma Kulk , et al. · 2022

Remote sensing observations from satellites and global biogeochemical models have combined to revolutionize the study of ocean biogeochemical cycling, but comparing the two data streams to each other and across time remains challenging due…

Ocean Mover's Distance: Using Optimal Transport for Analyzing Oceanographic Data Open

Sangwon Hyun, Aditya K. Mishra, Christopher L. Follett, Bror Jönsson, Gemma Kulk , et al. · 2021

Remote sensing observations from satellites and global biogeochemical models have combined to revolutionize the study of ocean biogeochemical cycling, but comparing the two data streams to each other and across time remains challenging due…

Correction: Kulk et al. Primary Production, an Index of Climate Change in the Ocean: Satellite-Based Estimates over Two Decades. Remote Sens. 2020, 12, 826 Open

Gemma Kulk, Trevor Platt, James Dingle, T. J. Jackson, Bror Jönsson , et al. · 2021

Since the article “Primary Production, an Index of Climate Change in the Ocean: Satellite-Based Estimates over Two Decades” by Kulk et al [...]

Effect of Reduced Anthropogenic Activities on Water Quality in Lake Vembanad, India Open

Gemma Kulk, Grinson George, Abdulaziz Anas, Nandini Menon, Theenathayalan Varunan , et al. · 2021

The United Nation’s Sustainable Development Goal Life Below Water (SDG-14) aims to “conserve and sustainably use the oceans, seas, and marine resources for sustainable development”. Within SDG-14, targets 14.1 and 14.2 deal with marine pol…

Sensing the ocean biological carbon pump from space: A review of capabilities, concepts, research gaps and future developments Open

Robert J. W. Brewin, Shubha Sathyendranath, Trevor Platt, Heather A. Bouman, Stefano Ciavatta , et al. · 2021

Dynamics of Vibrio cholerae in a Typical Tropical Lake and Estuarine System: Potential of Remote Sensing for Risk Mapping Open

Abdulaziz Anas, K. S. Krishna, S Vijayakumar, Grinson George, N. R. Menon , et al. · 2021

Vibrio cholerae, the bacterium responsible for the disease cholera, is a naturally-occurring bacterium, commonly found in many natural tropical water bodies. In the context of the U.N. Sustainable Development Goals (SDG) targets on health …

Primary Production, an Index of Climate Change in the Ocean: Satellite-Based Estimates over Two Decades Open

Gemma Kulk, Trevor Platt, James Dingle, T. J. Jackson, Bror Jönsson , et al. · 2020

Primary production by marine phytoplankton is one of the largest fluxes of carbon on our planet. In the past few decades, considerable progress has been made in estimating global primary production at high spatial and temporal scales by co…

Reconciling models of primary production and photoacclimation [Invited] Open

Shubha Sathyendranath, Trevor Platt, Žarko Kovač, James Dingle, T. J. Jackson , et al. · 2020

Primary production and photoacclimation models are two important classes of physiological models that find applications in remote sensing of pools and fluxes of carbon associated with phytoplankton in the ocean. They are also key component…

Size scaling of photophysiology and growth in four freshly isolated diatom species from Ryder Bay, western Antarctic peninsula Open

Gemma Kulk, Anton Buist, Willem H. van de Poll, Patrick D. Rozema, Anita G. J. Buma · 2018

Diatoms are one of the dominant groups in phytoplankton communities of the western Antarctic Peninsula ( WAP ). Although generally well‐studied, little is known about size dependent photophysiological responses in diatom bloom formation an…

Photophysiology of nitrate limited phytoplankton communities in Kongsfjorden, Spitsbergen Open

Gemma Kulk, Willem H. van de Poll, Anita G. J. Buma · 2018

In Arctic coastal regions, the phytoplankton bloom is often initiated by meltwater induced stratification in spring, while subsequent nutrient depletion is believed to drive phytoplankton succession in summer. The associated changes in pho…

Contrasting glacial meltwater effects on post-bloom phytoplankton on temporal and spatial scales in Kongsfjorden, Spitsbergen Open

Willem H. van de Poll, Gemma Kulk, Patrick D. Rozema, Corina P. D. Brussaard, Ronald J. W. Visser , et al. · 2018

Glacial meltwater discharge in fjords on the west coast of Spitsbergen is increasing due to climate change. The influence of this discharge on phytoplankton nutrient limitation, composition, productivity and photophysiology was investigate…

Assessing Drivers of Coastal Primary Production in Northern Marguerite Bay, Antarctica Open

Patrick D. Rozema, Gemma Kulk, Michiel P. Veldhuis, Anita G. J. Buma, Michael P. Meredith , et al. · 2017

The coastal ocean of the climatically-sensitive west Antarctic Peninsula is experiencing changes in the physical and (photo)chemical properties that strongly affect the phytoplankton. Consequently, a shift from diatoms, pivotal in the Anta…

Sea surface temperature control of taxon specific phytoplankton production along an oligotrophic gradient in the Mediterranean Sea Open

Willem H. van de Poll, P.G. Boute, Patrick D. Rozema, AGJ Buma, Gemma Kulk , et al. · 2015

Gemma Kulk YOU? Author Swipe