A5052746693- Marine and coastal ecosystems
- Ocean Acidification Effects and Responses
- Marine Biology and Ecology Research
- Water Quality Monitoring and Analysis
- Oceanographic and Atmospheric Processes
- Atmospheric and Environmental Gas Dynamics
- Marine and fisheries research
- Water Quality Monitoring Technologies
- Atmospheric chemistry and aerosols
- Microbial Community Ecology and Physiology
- Diatoms and Algae Research
- Marine and coastal plant biology
- Algal biology and biofuel production
- Isotope Analysis in Ecology
- Coral and Marine Ecosystems Studies
- Air Quality Monitoring and Forecasting
- Remote Sensing in Agriculture
- Coastal wetland ecosystem dynamics
- Air Quality and Health Impacts
- Methane Hydrates and Related Phenomena
- Marine Bivalve and Aquaculture Studies
- Atmospheric aerosols and clouds
- Mitochondrial Function and Pathology
- Solidification and crystal growth phenomena
- Oil Spill Detection and Mitigation
Goddard Space Flight Center
2018-2024
University of Maryland, Baltimore County
2024
Universities Space Research Association
2018-2020
Dalhousie University
2009-2018
Bedford Institute of Oceanography
2014
Fisheries and Oceans Canada
2014
University of Southern Mississippi
2006
University of Strathclyde
2003
Ocean color measured from satellites provides daily global, synoptic views of spectral waterleaving reflectances that can be used to generate estimates marine inherent optical properties (IOPs). These reflectances, namely the ratio upwelled radiances downwelled irradiances, describe light exiting a water mass defines its color. IOPs are absorption and scattering characteristics ocean dissolved particulate constituents. Because their dependence on concentration composition constituents,...
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...
Using large‐scale field surveys across 12 estuaries in two provinces Atlantic Canada, we analyzed changes phytoplankton and benthic macroalgal communities as well the canopy structure of eelgrass beds quantified their carbon nitrogen storage with increasing eutrophication. As eutrophication increased, biomass increased on average 1.8 times phaeopigments doubled. Among macroalgae, epiphytic Ulothrix speciosa 40 New Brunswick, Ulva lactuca 670 Prince Edward Island covering 61% bottom. Eelgrass...
We applied two numerical methods to in situ hyperspectral measurements of remote sensing reflectance Rrs assess the feasibility detection and monitoring toxic dinoflagellate, Karenia brevis, which has been shown exhibit unique absorption properties. First, an existing quasi-analytical algorithm was used invert spectra, Rrs(lambda), derive phytoplankton a(phi)Rrs(lambda). Second, fourth derivatives a(phi)Rrs(lambda) spectra were compared derivative a reference K. brevis spectrum by means...
Abstract. We develop an algorithm to compute pCO2 in the Scotian Shelf region (NW Atlantic) from satellite-based estimates of chlorophyll-a concentration, sea-surface temperature, and observed wind speed. This is based on a high-resolution time-series observations autonomous mooring. At mooring location (44.3° N 63.3° W), surface waters act as source CO2 atmosphere over annual scale, with outgassing −1.1 mol C m−2 yr−1 2007/2008. A hindcast air-sea fluxes 1999 2008 reveals significant...
This article proposes a simple and intuitive classification system by which to define full spectral remote sensing reflectance (Rrs(λ)) data with quantitative output that enables more manageable handling of information for aquatic science applications. The weighted harmonic mean the Rrs(λ) wavelengths outputs an Apparent Visible Wavelength (in units nanometers), representing one-dimensional geophysical metric color is inherently correlated shape. dimensionality reduction combined along...
Following its launch from Kennedy Space Center in February 2024, NASA’s Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission has been revolutionizing our understanding of Earth’s systems. The observatory hosts three cutting-edge instruments: the Ocean Color Instrument (OCI), a hyperspectral radiometer, and two multi-angular polarimeters, SpexOne HARP2. Together, these instruments are collecting unprecedented data on living oceans, atmospheric aerosols clouds,...
Abstract. NASA's Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission, scheduled for launch in the time frame of late 2022 to early 2023, will carry Ocean Color Instrument (OCI), a hyperspectral scanning radiometer, and two multiangle polarimeters (MAPs), UMBC Hyper-Angular Rainbow Polarimeter 2 (HARP2) SRON Spectro-Polarimeter Planetary EXploration one (SPEXone). One purpose PACE MAPs is better characterize aerosol properties, which can then be used improve atmospheric correction...
Abstract Laser‐based spectroscopic techniques, such as cavity ring‐down spectroscopy (CRDS), provide a new, cost effective and more widely available approach to measure the oxygen isotope ratio in water molecules, 18 O/ 16 O (δ O), are used increasingly δ world's oceans. Here, we present results from an interlaboratory comparison designed evaluate quality of CRDS‐derived measurements, their consistency with values measured by mass spectrometry (IRMS). We also discuss influence salt on...
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...
Eutrophication is an increasing problem in coastal waters of the Baltic Sea. Moreover, algal blooms, which occur every summer Gulf Gdansk can deleteriously impact human health, aquatic environment, and economically important fisheries, tourism, recreation industries. Traditional laboratory-based techniques for water monitoring are expensive time consuming, usually results limited numbers observations discontinuity space time. The use hyperspectral radiometers observation provides potential...
An equation for the rate of photosynthesis as a function irradiance introduced by T. Bannister included an empirical parameter b to account observed variations in curvature between initial slope and maximum photosynthesis. Yet researchers have generally favored equations with fixed curvature, possibly because was viewed having no physiological meaning. We developed analytic photosynthesis-irradiance relating changes degree connectivity photosystems, also considered recently published...
Empirical methods based on band ratios to infer chlorophyll-a concentration by satellite do not perform well over the optically complex waters of St. Lawrence Estuary and Gulf. Using a dataset 93 match-ups, we explore an alternative method relying empirical orthogonal functions (EOF) develop algorithm that relates satellite-derived remote sensing reflectances in situ for Sea-viewing Wide Field-of-view Sensor (SeaWiFS). Results show accuracy 41% at retrieving can be reached using EOF compared...
Cell abundances of Prochlorococcus, Synechococcus, and autotrophic picoeukaryotes were estimated in surface waters using principal component analysis (PCA) hyperspectral multispectral remote-sensing reflectance data. This involved the development models that employed multilinear correlations between cell across Atlantic Ocean a combination PCA scores sea temperatures. The retrieve high Prochlorococcus Equatorial Convergence Zone show their numerical dominance oceanic gyres, with decreases...
Little information exists concerning (i) source contributions to airborne particulate pollution in Qatar, (ii) the potential impact that deteriorating air quality may have on respiratory health of residents, and (iii) how climate change affect through its quality. Air Qatar be negatively affected by naturally occurring including dust/sand originating from adjacent desert regions, microbial communities associated with these particulates, volatile organic compounds (VOCs) released blooms...
Concurrent 24-hr samples of particulate matter median aerodynamic diameter less than 10 microm (PM10) were collected over a 10-day period in August 2000 at four sites along transect west-central Scotland, UK (passing from the coast through city Glasgow) line with prevailing southwesterly wind. Each sample was analyzed for chloride (Cl(-)), nitrate (NO3(-)), sulfate (SO4(2-)), ammonium (NH4(+)), calcium (Ca(2+)), iron (Fe), and organic hydrocarbon material (OHM). The contribution elemental...
The behavior of relatively large surface depressions and protrusions was studied as a function various epitaxial growth parameters. It is shown that at high concentrations silicon‐bearing species, stability occurs which cannot be explained solely on the basis gas phase diffusion capillarity.