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Showing 1 to 20 of 70 for “"Chl a"”.

  1. Assessing the spatiotemporal variation of phytoplankton biomass in Nandoni reservoir in the Vhembe District (South Africa) using LANDSAT satellite imagery

    Muthivhi, Fulufhelo Faith2022

    Chlorophyll–a (chl–a) is an optical active compound used as proxy for phytoplankton biomass to determine the trophic state of the aquatic ecosystem. Traditional approaches for monitoring aquatic system are time consuming, expensive, and non–continuous, therefore, Remote Sensing technologies are …

    venda Repository record

  2. Evaluating multi-satellite chlorophyll-a datasets an ocean colour case study within the Southern Benguela

    Oehley, CraigDepartment of Biological Sciences2025

    Chlorophyll-a (chl-a), a photosynthetic pigment that can be derived from satellite ocean colour, is often used as a proxy for phytoplankton biomass and to derive primary productivity. Initiatives such as the Ocean Colour Climate Change Initiative (OC-CCI) produce merged multi-satellite products to …

    cape-town Repository record

  3. Applications of Reservoir Limnology Theory and Steady-State Modeling to Eutrophication Management in Beaver Lake, Arkansas

    Rich, Matthew2018

    … were utilized to create a statistical model of chlorophyll-a (Chl-a), an indicator of PB, and Secchi transparency (ST), an indicator of Chl-a, in Beaver Lake, Arkansas, a 12,800-ha reservoir, in order to hindcast historical conditions. Sampling for Chl-a, ST, and photic depth occurred …

    arkansas Repository record

  4. The Influence of Changing Nutrients and Warming on Phytoplankton and its Interactions with Zooplankton in the North Sea

    Balkoni, AretiChristian-Albrechts-Universität zu Kiel

    … examines how these changes affect phytoplankton (Chlorophyll-a, Chl-a) and phytoplankton–zooplankton interactions using long-term satellite and in situ data. Satellite ocean-color analyses show predominantly declining Chl-a anomalies across the German Bight, with localized increases near the Elbe …

    cau-kiel Repository record

  5. Quantifying phytoplankton biomass and sediment in river plumes along the Agulhas Bank using remotely sensed data with deep learning techniques

    Pillay, HumeshniDepartment of Biological Sciences2023

    … Total Suspended Matter (TSM) and chlorophyll-a concentration ([Chl-a]) data products using a suite of available AC options against in situ [Chl-a] and TSM. The in situ data were collected through filtrations for fluorometric ([Chl-a]) and gravimetric (TSM) analyses. The …

    cape-town Repository record

  6. Comparison of spatial and spectral properties of Landsat-8 and Sentinel-2 data for mapping plant chlorophyll-a

    Bongwe, Vhuhwaho2023

    Background Chlorophyll-a (Chl-a) is a vital parameter to assess vegetation quality in plants as an indicator of photosynthetic capacity to ensure proper flow of ecosystem services. Nowadays, with a rapid increase in human population and deforestation chl-a in higher plants remain at risk from …

    venda Repository record

  7. Microalgae scenedesmus sp. Bioreactor for removal of nutrients and organic contents from wet market wastewater

    Jais, Noor MaisaraUniversiti Tun Hussein Onn Malaysia2019

    … Reaction rate constant, k = 29.50 mg NH3-N /mg chl-a per day and k= 22.12 mg PO43−/mg chl-a per day and saturation constant, Km= 227.68 mg/L of NH3-N and Km= 279.00 mg/L of PO43− with YN= 0.017 mg chl-a/mg NH3-N and Yp= 0.054 mg chl-a/mg PO43−. Thus, these expressions suggested that PO43− …

    uthm Repository record

  8. Spectral Fluorometric Characterization of Phytoplankton Community Composition and Biomass, Chromophoric Dissolved Organic Matter, and Photosynthetic Capacity Using the Algae Online Analyzer

    Goldman, Emily

    … used to test the AOA's ability to measure total chlorophyll a (chl a), phytoplankton community composition, 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 …

    south-carolina Repository record

  9. Seasonal and interannual variability of surface chlorophyll-a and sea surface temperature in the Delgoa Bight, southern Mozambique

    Dove, Veronica FernandoDepartment of Oceanography2015

    Multi satellite data for surface chlorophyll‐a (Chl‐a), sea surface temperature (SST), sea surface wind (SSW) and sea level anomalies (SLA) have been obtained and analysed over the Delagoa Bight (24‐28°S, 32‐36°E), southern Mozambique for the period 2003‐2012 at monthly time scales. Both …

    cape-town Repository record

  10. Detecting long-term trends in water quality parameters using remote sensing techniques

    Larkin, JinnaUniversity of Illinois at Urbana-Champaign2014

    … indicators of water quality: Secchi depth (SDD), chlorophyll-a concentration (Chl-a), and dissolved organic carbon (DOC). Reflectance and in situ data were collected within seven days of satellite overpass and used to build calibration models for SDD, Chl-a, and DOC in the Hudson River Estuary, …

    uiuc Repository record

  11. A Method Comparison and Stressor-Response Experimental Study of Nitrogen and Phosphorus Impacts to Periphyton in Ozark Streams

    Rodman, Ashley Renee2017

    … difference between bioassessment procedures for chlorophyll-a (chl-a) and ash-free dry mass (AFDM) (p = 0.123 and p = 0.550, respectively) or any interaction between method and season. Differences in chl-a and AFDM from both methods were detected (p < 0.001 and p = 0.012, respectively) when …

    arkansas Repository record

  12. Effects of Selective Grazing by Microzooplankton on Phytoplankton Composition in a Subtropical Estuary

    McGehee, Amanda Marie2014

    … rates were estimated based on the changes in chlorophyll a (chl a) concentration using the dilution technique, (Landry and Hassett, 1982) and a C-specific rate was obtained using chl a labeling (Redalje and Laws, 1981). Concentrations of chl a were determined using high performance liquid …

    usm Repository record

  13. Understanding the physical, chemical and biological processes across the subtropical convergence during austral automn

    George, CarenDepartment of Oceanography2009

    … between 41 ° - 42°15'S. The total integrated Chl-a ranged from 12.8 to 40.1 mg Chl-a/m2. The most significant correlation between biological and physical data was that of Chl-a and MLD (r=-0.374, n=45, p=0.013) over the entire survey region. Phosphate and nitrate (r=0.8779, n=45, p=0.001) …

    cape-town Repository record

  14. Reservoir Management Techniques to Enhance Biological Productivity and Protect Water Quality

    Thompson, Ben Alan2017

    … total phosphorus (TP), total dissolved P (TDP), chlorophyll a (chl a), and <80 >µm chl a in Lake Rayburn and, in Lake Norwood, total dissolved nitrogen (TDN), TP, TDP, chl a, and < 80 µm chl a concentrations were elevated. Few whole-ecosystem aquatic studies have been conducted in the manner of …

    arkansas Repository record

  15. Ecosystem health in Guánica Bay and La Parguera, Puerto Rico: Remote sensing of ocean color and metal analysis of coral tissue and surficial sediments

    Howe, Jahnelle2020

    … inputs and phytoplankton biomass through chlorophyll-<em>a </em>(chl-a) concentrations from Guánica Bay to La Parguera. Chl-a is an indicator of the abundance of phytoplankton and biomass in coastal, and estuarine water. In 2019, chl-a for virtual stations and single-pixel sample sites …

    cuny Repository record

  16. Physical controls on spring bloom dynamics in the Irminger Basin, North Atlantic

    Henson, S.A.University of Southampton2005

    … is extended with six years of SeaWiFS satellite chlorophyll-a concentration (chl-a) data, together with the corresponding model net heat flux (NCEP reanalysis) and satellite measured wind speed (QuikSCAT), sea surface temperature (SST; AVHRR) and photosynthetically available radiation (PAR; …

    soton Repository record

  17. Assessing the use of Viviparus georgianus snails as a means for biomanipulation of cyanobacterial species Microcystis aeruginosa

    Kokkinakis, Sofia2019

    … aeruginosa. We assessed this by using chlorophyll a (chl-a) as a measure for cyanobacteria in the upper and lower water columns of an ex-situ microcosm experimental system with and without the presence of snails, over an approximate 9-day time period. Our results demonstrated that in a …

    queens Repository record

  18. The effects of growth conditions on the elemental and biochemical composition of the diatom Thalassiosira weissflogii and the haptophyte Emiliania huxleyi

    Changsawang, NarinUniversity of Essex2015

    … smaller at higher temperature (22oC). Cellular chlorophyll a (chl a), nitrogen, phosphorus, and carbon contents were also lower at 22oC than other temperatures. Protein, total amino acids from free and combined amino acid, and total pigments [mol accessory pigment (mol chl a)-1] were decreased …

    essex Repository record

  19. Protection Covers for Trafficked Turf

    Royse, John PaulVirginia Tech2012

    … four days over the 20-day period to analyze chlorophyll (Chl a, Chl b, Chl a+b) and carotenoids (carot) under split factors of light intensity (12hr, PAR 530 μmol m-2 s-1, 5 μmol m-2 s-1) and soil moisture (50%, 75% of pot soil moisture capacity). Field trial treatment effects were observed …

    vt Repository record

  20. Qualitative and quantitative analyses of Lake Baikal's surface-waters using ocean colour satellite data (SeaWiFS)

    Heim, BirgitUniversität Potsdam

    … conditions of Lake Baikal. Next, various Chl-a algorithms were tested on the atmospherically-corrected optimized SeaWiFS data set (years 2001 to 2002), comparing the CONTINENT pigment ground-truth data with the Chl-a concentrations derived from the satellite data. This showed the high …

    potsdam-diss Repository record

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