A5079929193- Marine and coastal ecosystems
- Water Quality Monitoring and Analysis
- Marine Biology and Ecology Research
- Microbial Community Ecology and Physiology
- Ocean Acidification Effects and Responses
- Isotope Analysis in Ecology
- Atmospheric chemistry and aerosols
- Oceanographic and Atmospheric Processes
- Environmental Monitoring and Data Management
- Water Quality Monitoring Technologies
- Atmospheric and Environmental Gas Dynamics
- Planetary Science and Exploration
- Food Industry and Aquatic Biology
- Photoacoustic and Ultrasonic Imaging
- Technology Assessment and Management
- Arctic and Antarctic ice dynamics
- Spaceflight effects on biology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Digital Holography and Microscopy
- Marine and Offshore Engineering Studies
- Cell Image Analysis Techniques
- Geological Studies and Exploration
- Spectroscopy and Chemometric Analyses
- Aquatic and Environmental Studies
- Protist diversity and phylogeny
Goddard Space Flight Center
2011-2024
Science Systems and Applications (United States)
2014-2024
University of Maryland Center for Environmental Science
2018
NCCOS Hollings Marine Laboratory
2009
Ocean color satellites have provided a synoptic view of global phytoplankton for over 25 years through near surface measurements the concentration chlorophyll a. While remote sensing ocean has revolutionized our understanding and their role in oceanic freshwater ecosystems, it is important to consider both total biomass changes community composition order fully understand dynamics aquatic ecosystems. With upcoming launch NASA's Plankton, Aerosol, Clouds, Ecosystem (PACE) mission, we will be...
The ocean plays a central role in modulating the Earth's carbon cycle. Monitoring how cycle is changing fundamental to managing climate change. Satellite remote sensing currently our best tool for viewing surface globally and systematically, at high spatial temporal resolutions, past few decades have seen an exponential growth studies utilising satellite data research. Satellite-based observations must be combined with in-situ models, obtain comprehensive view of pools fluxes. To help...
Surface phytoplankton communities were linked with the carbon they export into deep ocean by comparing 18 S rRNA gene sequence from surface seawater and individually isolated sinking particles. Particles collected in sediment traps deployed at locations North Pacific subtropical gyre California Current. DNA was individual particles, bulk-collected trap seawater. The relative abundance of exported taxa water varied across functional groups ecosystems. Of sequences detected about half present...
Abstract. The late stage of the North East Atlantic (NEA) spring bloom was investigated during June 2005 along a transect section from 45 to 66° N between 15 and 20° W in order characterize contribution siliceous calcareous phytoplankton groups describe their distribution relation environmental factors. We measured several biogeochemical parameters such as nutrients, surface trace metals, algal pigments, biogenic silica (BSi), particulate inorganic carbon (PIC) or calcium carbonate, organic...
Using a modified geostatistical technique, empirical variograms were constructed from the first derivative of several diverse Remote Sensing Reflectance and Phytoplankton Absorbance spectra to describe how data points are correlated with "distance" across spectra. The maximum rate information gain is measured as function kurtosis associated Gaussian structure output, determined for discrete segments obtained variety water types (turbid river filaments, coastal waters, shelf dense Microcystis...
Holographic microscopy has emerged as a tool for in situ imaging of microscopic organisms and other particles the marine environment: appealing because relatively larger sampling volume simpler optical configuration compared to systems. However, its quantitative capabilities have so far remained uncertain, part hologram reconstruction image recognition required manual operation. Here, we assess skill our automated processing pipeline (CCV Pipeline), evaluate size concentration measurements...
Abstract The timing of sea ice retreat, light availability, and surface stratification largely control the phytoplankton community composition in Chukchi Sea. This region is experiencing a significant warming trend, an overall decrease cover, documented decline annual persistence thickness over past several decades. consequences earlier seasonal retreat longer sea‐ice‐free season on warrant investigation. We applied multivariate statistical techniques to elucidate mechanisms that relate...
Abstract Phytoplankton respond to physical and hydrographic forcing on time space scales up including those relevant climate change. Quantifying changes in phytoplankton communities over these is essential for predicting ocean food resources, occurrences of harmful algal blooms, carbon other elemental cycles, among predictions. However, one the best tools quantifying across scales, color sensors, constrained by its own spectral capabilities availability adequately vetted optical models. To...
Understanding nitrogen (N) uptake rates respect to nutrient availability and the biogeography of phytoplankton communities is crucial for untangling complexities marine ecosystems physical, biological, chemical forces shaping them. In summer 2016, we conducted measurements bulk microbial six 15 N-labeled substrates: nitrate, nitrite, ammonium, urea, cyanate, dissolve free amino acids across distinct provinces, including continental shelf Mid-and South Atlantic Bights (MAB SAB), Slope Sea,...
Environmental context Microscopic marine organisms have the potential to influence global climate through production of a trace gas, dimethylsulfide, which contributes cloud formation. Using 3 years observations, we investigated environmental drivers behind and degradation dimethylsulfide its precursor dimethylsulfoniopropionate. Our results highlight important role microbial community in rapidly cycling these compounds provide an dataset for future modelling studies. Abstract Oceanic...
Abstract. A global in-situ data set for validation of ocean-colour products from the ESA Ocean Colour Climate Change Initiative (OC-CCI) is presented. This version compilation, starting in 1997, now extends to 2021, which important most recent satellite optical sensors such as Sentinel 3B OLCI and NOAA-20 VIIRS. The comprises observations following variables: spectral remote-sensing reflectance, concentration chlorophyll-a, inherent properties, diffuse attenuation coefficient total suspended...
Owing to their importance in aquatic ecosystems, the demand for models that estimate phytoplankton biomass and community composition global ocean has increased over last decade. Moreover, impacts of climate change, including elevated carbon dioxide (CO2 ), stratification, warmer sea surface temperatures, will likely shape ocean. Chemotaxonomic methods are useful modeling from marker pigments normalized chlorophyll a (Chl a). However, photosynthetic pigments, particularly Chl a, sensitive...
Abstract. The late stage of the North East Atlantic (NEA) spring bloom was investigated during June 2005 along a transect section from 45 to 66° N between 15 and 20° W in order characterize contribution siliceous calcareous phytoplankton groups describe their distribution relation environmental factors. We measured several biogeochemical parameters such as nutrients, surface trace metals, algal pigments, biogenic silica (BSi), particulate inorganic carbon (PIC) or calcium carbonate, organic...
Through technological and research advances, numerous methods protocols have emerged to estimate spectral absorption of light by particles, ap, in an aquatic medium. However, the level agreement among measurements remains elusive. We employed a multi-method approach measurement precision measuring optical density particles on filter pad using two common spectrophotometric methods, determination precision, or uncertainty, computational techniques for estimating ap six ocean color wavelengths...
Ocean color satellites have provided a synoptic view of global phytoplankton for over 25 years through surface measurements the concentration chlorophyll a.While remote sensing ocean has revolutionized our understanding and their role in oceanic freshwater ecosystems, it is important to consider both total biomass changes community composition order fully understand dynamics aquatic ecosystems.With upcoming launch NASA's Plankton, Aerosol, Clouds,
The fluorescence of Chlorophyll a (Chla) has long been considered reliable estimate phytoplankton biomass in aquatic environments. vitro fluorometric method for measuring Chla is simple, fast, and cost-effective way to biomass. High performance liquid chromatography (HPLC) measurements have used historically ocean color validation. applicability fluorometrically - derived (FChla) satellite validation not fully evaluated. To this end, we developed statistical metrics evaluate the uncertainty...
The fluorescence of Chlorophyll a (Chla) has long been considered reliable estimate phytoplankton biomass in aquatic environments. vitro fluorometric method for measuring Chla is simple, fast, and cost-effective way to biomass. High performance liquid chromatography (HPLC) measurements have used historically ocean color validation. applicability fluorometrically - derived (FChla) satellite validation not fully evaluated. To this end, we developed statistical metrics evaluate the uncertainty...
The fluorescence of Chlorophyll a (Chla) has long been considered reliable estimate phytoplankton biomass in aquatic environments. vitro fluorometric method for measuring Chla is simple, fast, and cost-effective way to biomass. High performance liquid chromatography (HPLC) measurements have used historically ocean color validation. applicability fluorometrically - derived (FChla) satellite validation not fully evaluated. To this end, we developed statistical metrics evaluate the uncertainty...
The fluorescence of Chlorophyll a (Chla) has long been considered reliable estimate phytoplankton biomass in aquatic environments. vitro fluorometric method for measuring Chla is simple, fast, and cost-effective way to biomass. High performance liquid chromatography (HPLC) measurements have used historically ocean color validation. applicability fluorometrically - derived (FChla) satellite validation not fully evaluated. To this end, we developed statistical metrics evaluate the uncertainty...
The fluorescence of Chlorophyll a (Chla) has long been considered reliable estimate phytoplankton biomass in aquatic environments. vitro fluorometric method for measuring Chla is simple, fast, and cost-effective way to biomass. High performance liquid chromatography (HPLC) measurements have used historically ocean color validation. applicability fluorometrically - derived (FChla) satellite validation not fully evaluated. To this end, we developed statistical metrics evaluate the uncertainty...