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Showing 1 to 20 of 20 for “"CDOM"”.
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Patterns in the Variation of CDOM Spectral Slopes in the Western Lake Erie Basin
… patterns. Colored dissolved organic matter (CDOM), which is a component of the water, absorbs light strongly in the ultraviolet to blue wavelengths, which overlaps a strong absorption area of the spectrum for the chlorophyll a in algae. Measurements in these wavelengths are essential for …
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Direct and indirect photoreactions of chromophoric dissolved organic matter : roles of reactive oxygen species and iron
… of chromophoric dissolved organic matter (CDOM) are one of the principal processes controlling its fate in coastal waters. The photochemical decomposition of CDOM leads to the formation of a variety of biologically available carbon substrates. Photomineralization of CDOM to dissolved …
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Marsh-Exported Dissolved Organic Matter Fate in Estuaries
… of DOM, chromophoric dissolved organic matter (CDOM), impacts coastal optical properties, ocean color, and light attenuation. While marshes are largely considered sinks for carbon due to their high productivity and low soil carbon degradation rates, laterally they are sources of carbon as …
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Temporal and Spatial Patterns in Optical Properties of Colored Dissolved Organic Matter on Florida’s Gulf Coast: Shelf to Stream to Aquifer
… of Colored Dissolved Organic Matter (CDOM) in surface and ground waters in South Florida was conducted using fluorescence and absorption spectroscopy. Waters of the West Florida Shelf are heavily influenced by many river systems on Florida's Gulf Coast that, to the first order control …
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Microbial Degradability of Terrigenous, Marsh-Exported, and Estuarine Colored Dissolved Organic Matter in Long Island Sound
… webs. Additionally, the colored portion of DOM (CDOM) impacts coastal optical properties, ocean color, and light attenuation. High levels of CDOM have been shown to inhibit the growth of phytoplankton and limit photosynthesis, damaging the food chain and limiting the production of oxygen in …
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Spectral Irradiance and Phytoplankton Community Composition In Blackwater Estuaries
… influenced by colored dissolved organic matter (CDOM) which absorbs blue light and shifts the underwater light field to the red end of the electromagnetic spectrum. My dissertation research examined relationships between spectral irradiance (water color) and phytoplankton community composition in …
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Estimating the water quality condition of river and lake water in the Midwestern United States from its spectral characteristics
… (NAP), and colored dissolved organic matter (CDOM) in episodic St. Joseph River plumes in southern Lake Michigan. One set of EO-1 Hyperion imagery and one set of boat-based spectrometer measurements were successfully acquired to capture episodic plume events. Coincident water quality …
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Spectral Fluorometric Characterization of Phytoplankton Community Composition and Biomass, Chromophoric Dissolved Organic Matter, and Photosynthetic Capacity Using the Algae Online Analyzer
… chromophoric dissolved organic matter (CDOM), and phytoplankton group-specific photosynthetic capacity. In the field, I found that the AOA over-estimated total chl a (as compared to direct determinations by HPLC) by a factor of 2.2 ± 0.6, but that the relationship between the total chl a …
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A study of the New York / New Jersey coastal water : bio-optical characteristics of the harbor estuary and the effects of heavy metals on brown tide alga of the bight
… of 47 +/- 18% color dissolved organic matter (CDOM), 18 +/- 6% non-algal particles (NAP), and 35 +/- 16% phytoplankton. The narrow variation in the NAP contribution demonstrates that it can be conveniently subtracted from the total absorption. Furthermore, analysis showed that organics …
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Factors Influencing the Spatial and Temporal Distrubtion of Primary Productivity and Community Respiration in the Mississippi Coastal Estuarine Region
… (SPM), chromophoric dissolved organic matter (CDOM), and chlorophyll-a] and the partitioning of each biogeochemical parameter using the empirical model reveals that SPM was the dominant contributor to Kd(P AR). However, relative contribution of SPM ( as well as values of Kd) diminished in the …
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Bioavailability of dissolved organic matter in coastal waters
… DOM is coloured containing a part that absorbs (CDOM), and a part that absorbs and reemits the energy again (Fluorescence, FDOM). The relation between the optical properties of DOM and the bioavailability of DOC was tested in the Ría de Vigo. This study demonstrated that it was possible to derive …
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Oceanic Light Absorption Properties: Assessment and Characterization in the Southeastern Bering Sea Using Field and Satellite Observations
… these waters due to the dominant contribution by CDOM absorption. The CDOM absorption accounted for greater than 50% of the diffuse light attenuation coefficient and caused the remote sensing reflectance to be lower, more in the blue than the green region of the visible spectrum, causing the blue …
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Variations in modelled and measured hyperspectral remote sensing reflectance
… by coloured dissolved organic material, αCDOM(400), provided accurate values of the absorption coefficient (R² = 0.91). Algorithm performance was improved when turbid stations, identified using cluster analysis, were removed. Hyperspectral radiometry was also used to investigate variations …
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Seaglider observations of biogeochemical variability in the Iberian upwelling system.
… a (chl a), coloured dissolved organic material (CDOM) and optical backscatter. Deployed for 113 days over summer 2010, Orca completed 17 zonal transects across the shelf, continental slope and open ocean at 42.1° N. Data collected during the campaign was used to assess both the physics of the …
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Utility of remote sensing data in retrieval of water quality consituents concentrations in coastal water of New Jersey
… (CHL), color dissolved organic matter (CDOM) and total suspended materials (TSM). Ocean color remote sensing, a technique to collect color data by detection of upward radiance from a distance (Bukata et al.,1995), provides a synoptic view for determining these concentrations from …
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Understanding the Impacts of Freshwater Fluxes on the Biogeochemistry of the Coastal Arctic: A Case Study of Prudhoe Bay
… variations. A novel finding was the unique CDOM composition in Prudhoe Bay, characterized by a lower molecular weight of organic matter, potentially due to high primary production or low terrestrial inputs. Seasonal influences on chlorophyll-a concentrations and primary productivity were …
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The Observation, Modeling, and Retrieval of Bio-Optical Properties for Coastal Waters of the Southern Chesapeake Bay
… Case 1 waters, colored dissolved organic matter (CDOM) derived from non-phytoplankton sources and sedimentary particles also play very important roles in coastal Case 2 waters. Strongly influenced by riverine discharge, the shallow coastal waters of the southern Chesapeake Bay provide challenges …
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Temporal variability of fluorescent dissolved organic matter at a brackish, tidal marsh-estuary interface
<p>Marshes are both terrestrial and aqueous, sitting as an intermediate between land and water. Studies over constrained numbers of tidal cycles have demonstrated that these marshes are net exporters of dissolved organic carbon (DOC) to adjoining estuaries, however, there is need for continuous …
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Biogeoquímica de la materia orgánica disuelta en el golfo de Cádiz: caracterización óptica y química
… (1.25 kg C s −1 y 0.22 × 103 m2 s−1 de DOC y CDOM, respectivamente). Por último, en el estuario del río Guadalete, localizado en la bahía de Cádiz, evaluamos la relación entre los gases invernadero CO2, CH4 y N2O y la composición de la DOM. Se identificaron cuatro componentes fluorescentes, …
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Ecological effects of turbidity variations in and around dredging areas in the Port of Tauranga
… and coloured dissolved organic matter (CDOM). I also measured light irradiance before and after dredging activities. Using these measurements in a multiple regression analysis allowed the main contributor to light attenuation in the harbour to be determined. Correlating the light …