A5050444907- Marine and coastal ecosystems
- Oceanographic and Atmospheric Processes
- Marine Biology and Ecology Research
- Marine and fisheries research
- Water Quality Monitoring and Analysis
- Coral and Marine Ecosystems Studies
- Atmospheric and Environmental Gas Dynamics
- Microbial Community Ecology and Physiology
- Isotope Analysis in Ecology
- Ocean Acidification Effects and Responses
- Water Quality Monitoring Technologies
- Climate variability and models
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal plant biology
- Arctic and Antarctic ice dynamics
- Marine Bivalve and Aquaculture Studies
- Calibration and Measurement Techniques
- Meteorological Phenomena and Simulations
- Coastal and Marine Management
- Remote-Sensing Image Classification
- Oil Spill Detection and Mitigation
- Remote Sensing and Land Use
- Algal biology and biofuel production
- Land Use and Ecosystem Services
- Remote Sensing in Agriculture
Plymouth Marine Laboratory
2016-2025
National Centre for Earth Observation
2016-2025
University of Science and Technology
2021
Optica
2019
Bedford Institute of Oceanography
2002-2014
Fisheries and Oceans Canada
1999-2014
Dalhousie University
2000-2011
Partnership for Observation of the Global Ocean
2009
University of Concepción
2006
Institute of Astronomy and Space Physics
2005
The world's oceans contain a complex mixture of micro-organisms that are for the most part, uncharacterized both genetically and biochemically. We report here metagenomic study marine planktonic microbiota in which surface (mostly marine) water samples were analyzed as part Sorcerer II Global Ocean Sampling expedition. These samples, collected across several-thousand km transect from North Atlantic through Panama Canal ending South Pacific yielded an extensive dataset consisting 7.7 million...
An estimate of global net primary production in the ocean has been computed from monthly mean near-surface chlorophyll fields for 1979–1986 obtained by Nimbus 7 CZCS radiometer. Our model required information about subsurface distribution chlorophyll, parameters photosynthesis-light relationship, sun angle and cloudiness. The computations were partitioned among 57 biogeochemical provinces that specified regional oceanography examination fields. Making different assumptions overestimation...
Abstract Ecosystem processes are important determinants of the biogeochemistry ocean, and they can be profoundly affected by changes in climate. Ocean models currently express ecosystem through empirically derived parameterizations that tightly link key geochemical tracers to ocean physics. The explicit inclusion will permit ecological taken into account, allow us address several questions, including causes observed glacial–interglacial atmospheric trace gases aerosols, how oceanic uptake CO...
The variations of the spectral absorption coefficient seawater can be attributed to three principal factors—phytoplankton, nonchlorophyllous particles, and yellow substances— whose concentrations are represented in this study terms chlorophyll a pheophytin content ( C ), total scattering b by filtered at given wavelength Y ). By assuming an exponential substances, we developed new iterative method for identifying situ apparent specific curves other two factors. weighting coefficients each...
Satellites provide the only avenue by which marine primary production can be studied at ocean-basin scales. With maps of chlorophyll distribution derived from remotely sensed data on ocean color as input, deduction a suitable algorithm for is problem in applied plant physiology. An proposed that combines spectral and angular model submarine light with response algal photosynthesis. To apply large horizontal scale, dynamic biogeography needed physiological rate parameters biological structure...
Observations of Earth from space have been made for over 40 years and contributed to advances in many aspects climate science. However, attempts exploit this wealth data are often hampered by a lack homogeneity continuity insufficient understanding the products their uncertainties. There is, therefore, need reassess reprocess satellite datasets maximize usefulness The European Space Agency has responded establishing Climate Change Initiative (CCI). CCI will create new records (currently) 13...
Ocean colour is recognised as an Essential Climate Variable (ECV) by the Global Observing System (GCOS); and spectrally-resolved water-leaving radiances (or remote-sensing reflectances) in visible domain, chlorophyll-a concentration are identified required ECV products. Time series of products at global scale high spatial resolution, derived from ocean-colour data, key to studying dynamics phytoplankton seasonal inter-annual scales; their role marine biogeochemistry; carbon cycle; modulation...
Spectrally-resolved water-leaving radiances (ocean colour) and inferred chlorophyll concentration are key to studying phytoplankton dynamics at seasonal inter-annual scales, for a better understanding of the role in marine biogeochemistry; global carbon cycle; response ecosystems climate variability, change feedback processes. Ocean colour data also have critical operational observation systems monitoring coastal eutrophication, harmful algal blooms, sediment plumes. The contiguous...
Primary production by marine phytoplankton is one of the largest fluxes carbon on our planet. In past few decades, considerable progress has been made in estimating global primary at high spatial and temporal scales combining situ measurements with remote-sensing observations biomass. One major challenges this approach lies assignment appropriate model parameters that define photosynthetic response to light field. present study, a database photosynthesis versus irradiance (P-I) 20-year...
The habitability of our planet depends on interlocking climate and biogeochemical systems. Living organisms have played key roles in the evolution these Now man is perturbing climate/biogeochemical systems at an unprecedented pace. In particular, global carbon cycle being forced directly by changes fluxes (e.g. fossil fuel burning deforestation/reforestation), indirectly through atmospheric chemistry stratospheric ozone depletion increases green house gases). Nutrient cycles are also...
Abstract A three-component model of ocean colour is presented, that takes into account contributions phytoplankton, non-chlorophyllous particles and dissolved organic matter. The based on theoretical considerations validated by comparison with observed reflectance spectra. It then used to address the problem estimating chlorophyll concentration in coastal (case 2) waters remote sensing. Principal component analysis carried out a large number spectra simulated using model. results indicate...
This article is in Free Access Publication and may be downloaded using the “Download Full Text PDF” link at right.
Algorithms that have been used on a routine basis for remote sensing of the phytoplankton pigment, chlorophyll- a, from ocean colour data satellite sensors such as CZCS (Coastal Zone Color Scanner), SeaWiFS (Sea Viewing Wide Field-of-View Sensor) and OCTS (Ocean Colour Temperature Scanner) are all an empirical nature. However, there exist theoretical models allow to be expressed function inherent optical properties seawater, absorption coefficient backscattering coefficient. These can in...
Absorption spectra of several phytoplankton species were decomposed, after correction for the particle effect, to estimate in vivo absorption properties major light-harvesting pigments algae.A Gaussian shape is suitable, theoretically and empirically, represent individual photosynthetic components.The parameters agreed well with expected pigment compositions 3 groups algae, peak heights linearly correlated concentrations any one 4 measured samples.The linear relationship did not vary...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 272:59-68 (2004) - doi:10.3354/meps272059 Discrimination of diatoms from other phytoplankton using ocean-colour data Shubha Sathyendranath1,2, Louisa Watts3, Emmanuel Devred1,2,*, Trevor Platt2, Carla Caverhill2, Heidi Maass2 1Department Oceanography, Dalhousie University, Halifax, Nova Scotia B3H 4J1, Canada...
The estimation by remote sensing of annual primary production at ocean basin scales is illustrated for the Atlantic Ocean, using monthly averaged Coastal Zone Color Scanner data 1979. principal supplementary used were some 873 vertical profiles chlorophyll and 248 sets parameters derived from photosynthesis‐light experiments. This information was to parametrize local algorithm calculation in 12 subregions entire domain each four seasons. Four different procedures tested production. These...
Climate change could lead to mismatches between the reproductive cycles of marine organisms and their planktonic food. We tested this hypothesis by comparing shrimp (Pandalus borealis) egg hatching times satellite-derived phytoplankton bloom dynamics throughout North Atlantic. At large spatial long temporal (10 years or longer) scales, was correlated with timing spring bloom. Annual development were determined locally bottom water temperature. conclude that different populations P. borealis...