A5024573043- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Atmospheric and Environmental Gas Dynamics
- Oceanographic and Atmospheric Processes
- Water Quality Monitoring and Analysis
- Microbial Community Ecology and Physiology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal plant biology
- Ocean Acidification Effects and Responses
- Diatoms and Algae Research
- Marine and fisheries research
- Fish Ecology and Management Studies
- Arctic and Antarctic ice dynamics
- Marine Toxins and Detection Methods
- Water Quality Monitoring Technologies
- Global Energy and Sustainability Research
- Food Industry and Aquatic Biology
- Algal biology and biofuel production
- Remote Sensing in Agriculture
- Methane Hydrates and Related Phenomena
- Marine animal studies overview
- Coastal and Marine Management
- Human Resource Development and Performance Evaluation
- Coral and Marine Ecosystems Studies
University of Rhode Island
2011-2024
University-National Oceanographic Laboratory System
2024
University of California, Santa Barbara
2024
University of East Anglia
2023
Michigan Technological University
2012-2017
University of Wisconsin–Madison
2010-2013
Abstract. We present a numerical model of the ocean that couples three-stream radiative transfer component with marine biogeochemical–ecosystem in dynamic three-dimensional physical framework. The resolves penetration spectral irradiance as it is absorbed and scattered within water column. explicitly include effect several optically important constituents (different phytoplankton functional types; detrital particles; coloured dissolved organic matter, CDOM). evaluated against situ-observed...
To improve our understanding of the role phytoplankton for marine ecosystems and global biogeochemical cycles, information on distribution major groups is essential. Although algorithms have been developed to assess diversity from space over two decades, so far application these data sets has limited. This scientific roadmap identifies user needs, summarizes current state art, pinpoints gaps in long-term objectives deliver space-derived that meets requirements. These using ocean color...
Phytoplankton are composed of diverse taxonomical groups, which manifested as distinct morphology, size and pigment composition. These characteristics, modulated by their physiological state, impact light absorption scattering, allowing them to be detected with ocean color satellite radiometry. There is a growing volume literature describing algorithms retrieve information on phytoplankton composition in the ocean. This synthesis provides review current methods simplified comparison...
The concept of phytoplankton functional types has emerged as a useful approach to classifying phytoplankton. It finds many applications in addressing some serious contemporary issues facing science and society. Its use is not without challenges, however. As noted earlier, there no universally-accepted set types, and the used have to be carefully selected suit particular problem being addressed. important that sum total all matches all phytoplankton under consideration. For example, if...
Abstract The biodiversity and high productivity of coastal terrestrial aquatic habitats are the foundation for important benefits to human societies around world. These globally distributed need frequent broad systematic assessments, but field surveys only cover a small fraction these areas. Satellite‐based sensors can repeatedly record visible near‐infrared reflectance spectra that contain absorption, scattering, fluorescence signatures functional phytoplankton groups, colored dissolved...
Abstract Efficiency of the biological pump carbon to deep ocean depends largely on biologically mediated export from surface and its remineralization with depth. Global satellite studies have primarily focused chlorophyll concentration net primary production (NPP) understand role phytoplankton in these processes. Recent retrievals composition now allow for size cells be considered. Here we improve understanding structure impacts particle export, remineralization, transfer. A global...
Phytoplankton cell size is important to biogeochemical and food web processes. The goal of this study estimate phytoplankton distribution from satellite imagery spectral remote sensing reflectance ( R rs λ )). Previous studies have indicated classes distinctive absorption spectra despite the physiological taxonomic variability within an assemblage. For study, chlorophyll specific for class extremes, pico‐ microphytoplankton, are weighted by percent microplankton S fm ) basis retrieval...
Abstract Aim This study examined phytoplankton blooms on a global scale, with the intention of describing patterns bloom timing and size, effect size blooms, time series trends in characteristics. Location Global. Methods We used change‐point statistics algorithm to detect (1998–2015) chlorophyll concentration data over grid. At each location, for dominant bloom, based search period that resulted most detected, were describe spatial distribution characteristics globe. Time also subjected...
Abstract. Particulate organic carbon (POC) flux estimated from POC concentration observations sediment traps and 234Th are compiled across the global ocean. The compilation includes six time series locations: CARIACO, K2, OSP, BATS, OFP, HOT. Efficiency of biological pump to deep ocean depends largely on biologically mediated export surface its remineralization with depth; thus related parameters able be satellite were merged at observation sites. Satellite include net primary production,...
There is a growing use of remote sensing observations for detecting and quantifying freshwater cyanobacteria populations, yet the inherent optical properties these communities in natural settings, fundamental to bio-optical algorithms, are not well known. Towards bridging this knowledge gap, we measured full complement western Lake Erie during blooms summers 2013 2014. Our measurements focus attention on uniqueness blooms, which have consequences modeling. We found basin our field work were...
We developed an absorption-based primary production model that includes the effects of phytoplankton community size structure for continental margin and adjoining Gulf Stream waters Middle Atlantic Bight (MAB). The uses seasonal cycles from previously published results, representative absorption spectra, remotely sensed chlorophyll concentration, sea surface temperature, photosynthetically active radiation, in situ determination mixed layer dynamics, determined nitrate concentration. allows...
Abstract. The absorption and fluorescence properties of chromophoric dissolved organic matter (CDOM) are reported for the inner shelf, slope waters outer shelf regions eastern Bering Sea during summer 2008, when a warm, thermally stratified surface mixed layer lay over cold pool (< 2 °C) that occupied entire middle shelf. CDOM at 355 nm (ag355) its spectral (S) in conjunction with excitation–emission matrix (EEM) parallel factor analysis (PARAFAC) revealed large variability...
Abstract The shunt of photosynthetically derived particulate organic carbon (POC) from the euphotic zone and deep remineralization comprises basic mechanism “biological pump.” POC raining through “twilight zone” (euphotic depth to 1 km) “midnight (1 km 4 is remineralized back inorganic form respiration. Accurately modeling flux critical for understanding pump” its impacts on air‐sea CO 2 exchange and, ultimately, long‐term ocean sequestration. Yet commonly used parameterizations have not...
Abstract. Light emerging from natural water bodies and measured by radiometers contains information about the local type concentrations of phytoplankton, non-algal particles colored dissolved organic matter in underlying waters. An increase spectral resolution forthcoming satellite airborne remote sensing missions is expected to lead new or improved capabilities for characterizing aquatic ecosystems. Such upcoming include NASA's Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission; NASA...
Abstract Decades of research have relied on satellite-based estimates chlorophyll- a concentration to identify oceanographic processes and plan in situ observational campaigns; however, the patterns intrinsic temporal variation not been investigated global scale. Here we develop metric quantify time series complexity (i.e., measure ups downs sequential observations) show that seemingly disparate regions (e.g., Atlantic vs Indian, equatorial subtropical) ocean can be inherently similar. These...
Abstract This study characterized ocean biological carbon pump metrics in the second iteration of REgional Carbon Cycle Assessment and Processes (RECCAP2) project. The analysis here focused on comparisons global biome‐scale regional patterns particulate organic (POC) production sinking flux from RECCAP2 biogeochemical model ensemble against observational products derived satellite remote sensing, sediment traps, geochemical methods. There was generally good model‐data agreement mean...
Satellite remote sensing offers one of the best spatial and temporal observational approaches. However, well‐validated satellite imagery has remained elusive for Lake Superior. Superior's optical properties are highly influenced by colored dissolved organic matter (CDOM), which hindered retrieval chlorophyll concentration through band‐ratio algorithms. This study evaluated seven existing inversion The top‐performing algorithm was tuned to a Superior data set applied imagery. via algorithms...
Phytoplankton pigments absorb sunlight for photosynthesis, protect the chloroplast from damage caused by excess light energy, and influence color of water. Some act as bio-markers are important separation phytoplankton functional types. Among many efforts that have been made to obtain information on bio-optical properties, Gaussian curves decomposed absorption spectrum used represent different pigments. We incorporated scheme into a semi-analytical model obtained remote sensing reflectance....
Abstract Satellite remote sensing of colored dissolved organic matter (CDOM) has focused on CDOM absorption ( a ) at reference wavelength, as its magnitude provides insight into the underwater light field and large‐scale biogeochemical processes. spectral slope, S , been treated constant or semiconstant parameter in satellite retrievals despite significant regional temporal variabilities. other optical metrics provide insights composition, processing, food web dynamics, carbon cycling. To...
Abstract Shipboard sampling of ocean biogeochemical properties is necessarily limited by logistical and practical constraints. As a result, the majority observations are obtained for spring/summer period in regions relatively accessible from major port. This limitation may bias conceptual understanding we have spatial seasonal variability important components Earth system. Here examine influence on global estimates carbon export flux sub-sampling model to simulate real, realistic random...
Aquatic ecosystems and associated biogeochemical cycles are dynamic driven by spatiotemporally diverse processes, including increasing impacts from more extreme weather climate-related stressors. Ocean color datasets collected airborne satellite sensors provide platforms capable of observing distinct ecosystem features at requisite spatial temporal scales; however, many the tools used, novel developed for hyperspectral datasets, rely on assumptions to retrieve component optical properties...