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  • 1
    Publication Date: 2017-01-24
    Description: The detection and prediction of changes in coastal ecosystems require a better understanding of the complex physical, chemical and biological interactions, which involves that observations should be performed continuously. For this reason, there is an increasing demand for small, simple and cost-effective in situ sensors to analyze complex coastal waters at a broad range of scales. In this context, this study seeks to explore the potential of beam attenuation spectra, c(λ), measured in situ with an advanced-technology optical transmissometer, for assessing temporal and spatial patterns in the complex estuarine waters of Alfacs Bay (NW Mediterranean) as a test site. In particular, the information contained in the spectral beam attenuation coefficient was assessed and linked with different biogeochemical variables. The attenuation at λ = 710 nm was used as a proxy for particle concentration, TSM, whereas a novel parameter was adopted as an optical indicator for chlorophyll a (Chl-a) concentration, based on the local maximum of c(λ) observed at the long-wavelength side of the red band Chl-a absorption peak. In addition, since coloured dissolved organic matter (CDOM) has an important influence on the beam attenuation spectral shape and complementary measurements of particle size distribution were available, the beam attenuation spectral slope was used to analyze the CDOM content. Results were successfully compared with optical and biogeochemical variables from laboratory analysis of collocated water samples, and statistically significant correlations were found between the attenuation proxies and the biogeochemical variables TSM, Chl-a and CDOM. This outcome depicted the potential of high-frequency beam attenuation measurements as a simple, continuous and cost-effective approach for rapid detection of changes and patterns in biogeochemical properties in complex coastal environments.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 2
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    COPERNICUS GESELLSCHAFT MBH
    In:  EPIC3Biogeosciences, COPERNICUS GESELLSCHAFT MBH, 8, pp. 3609-3629, ISSN: 1726-4170
    Publication Date: 2019-07-17
    Description: The relationship between phytoplankton assemblages and the associated optical properties of the water body is important for the further development of algorithms for large-scale remote sensing of phytoplankton biomass and the identification of phytoplankton functional types (PFTs), which are often representative for different biogeochemical export scenarios. Optical in-situ measurements aid in the identification of phytoplankton groups with differing pigment compositions and are widely used to validate remote sensing data. In this study we present results from an interdisciplinary cruise aboard the RV Polarstern along a north-to-south transect in the eastern Atlantic Ocean in November 2008. Phytoplankton community composition was identified using a broad set of in-situ measurements. Water samples from the surface and the depth of maximum chlorophyll concentration were analyzed by high performance liquid chromatography (HPLC), flow cytometry, spectrophotometry and microscopy. Simultaneously, the above- and underwater light field was measured by a set of high spectral resolution (hyperspectral) radiometers. An unsupervised cluster algorithm applied to the measured parameters allowed us to define bio-optical provinces, which we compared to ecological provinces proposed elsewhere in the literature. As could be expected, picophytoplankton was responsible for most of the variability of PFTs in the eastern Atlantic Ocean. Our bio-optical clusters agreed well with established provinces and thus can be used to classify areas of similar biogeography. This method has the potential to become an automated approach where satellite data could be used to identify shifting boundaries of established ecological provinces or to track exceptions from the rule to improve our understanding of the biogeochemical cycles in the ocean.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 3
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    In:  EPIC3Sea Technology, Volume 52, No. 2, 55-57, 52, pp. 55-57
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
    Publication Date: 2015-01-30
    Description: Colored dissolved organic matter (CDOM) absorption and fluorescence spectra were analyzed from samples collected in the Lena River Delta region (Siberia, Russia; summer-2013) and in the Alfacs Bay (Ebro River Delta, Spain; summer-2013/winter-2014) in order to use optical measurements to infer loading and origin of CDOM. Absorbance spectra and Excitation-Emission matrices (EEMs) were obtained with a HORIBA Aqualog® spectrofluorometer. CDOM absorption at 443nm (a443) and terrestrial absorption slope (STER, 275–295nm) were inversely related (r2=0.49; p〈0.05) and differed significantly (p〈0.05) among the campaigns. The highest a443 values were presented by the Lena (1.28±0.81m-1) followed by Alfacs summer (0.53±0.33m-1) and Alfacs winter (0.32±0.27m-1) samples. A significant vertical decrease of a443 over the water column was observed within the Lena samples, with the highest values in the surface samples (2.10±0.7m-1) and the lowest values within the bottom (5–25m; 0.71±0.25m-1) (p〈0.05). No differences between surface and bottom samples were found for the Alfacs samples (p〉0.05). The slope ratio between STER and the marine absorption slope (SMAR, 350–400nm) showed that surface Lena waters were under influence of terrigenous CDOM while the deeper layer was characterized by marine CDOM content. Traditional “peak-picking” method for EEM analysis detected four components: UVA and UVC humic-like (peaks C and A, respectively; allochthonous; detected in all samples) and tyrosine- and UVA marine humic-like (peaks B and M; autochthnous). However, peaks B and M were characteristic from bottom Lena samples and few Alfacs samples presented peak B. Parallel-Factorial-Analysis will be further applied on EEMs to precisely detect the CDOM components.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
    Location Call Number Limitation Availability
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  • 5
    Publication Date: 2015-03-03
    Description: Colored dissolved organic matter (CDOM) absorption and fluorescence spectra were analyzed from samples collected in the Lena River Delta region (Siberia, Russia; summer-2013) and in the Alfacs Bay (Ebro River Delta, Spain; summer-2013/winter-2014) in order to use optical measurements to infer loading and origin of CDOM. Absorbance spectra and Excitation-Emission matrices (EEMs) were obtained with a HORIBA Aqualog® spectrofluorometer. CDOM absorption at 443nm (a443) and terrestrial absorption slope (STER, 275–295nm) were inversely related (r2=0.49; p〈0.05) and differed significantly (p〈0.05) among the campaigns. The highest a443 values were presented by the Lena (1.28±0.81m-1) followed by Alfacs summer (0.53±0.33m-1) and Alfacs winter (0.32±0.27m-1) samples. A significant vertical decrease of a443 over the water column was observed within the Lena samples, with the highest values in the surface samples (2.10±0.7m-1) and the lowest values within the bottom (5–25m; 0.71±0.25m-1) (p〈0.05). No differences between surface and bottom samples were found for the Alfacs samples (p〉0.05). The slope ratio between STER and the marine absorption slope (SMAR, 350–400nm) showed that surface Lena waters were under influence of terrigenous CDOM while the deeper layer was characterized by marine CDOM content. Traditional “peak-picking” method for EEM analysis detected four components: UVA and UVC humic-like (peaks C and A, respectively; allochthonous; detected in all samples) and tyrosine- and UVA marine humic-like (peaks B and M; autochthnous). However, peaks B and M were characteristic from bottom Lena samples and few Alfacs samples presented peak B. Parallel-Factorial-Analysis will be further applied on EEMs to precisely detect the CDOM components.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
    Location Call Number Limitation Availability
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  • 6
    Publication Date: 2022-03-21
    Description: The oceans are a fundamental source for climate balance, sustainability of resources and life on Earth, therefore society has a strong and pressing interest in maintaining and, where possible, restoring the health of the marine ecosystems. Effective, integrated ocean observation is key to suggesting actions to reduce anthropogenic impact from coastal to deep-sea environments and address the main challenges of the 21st century, which are summarized in the UN Sustainable Development Goals and Blue Growth strategies. The European Multidisciplinary Seafloor and water column Observatory (EMSO), is a European Research Infrastructure Consortium (ERIC), with the aim of providing long-term observations via fixed-point ocean observatories in key environmental locations across European seas from the Arctic to the Black Sea. These may be supported by ship-based observations and autonomous systems such as gliders. In this paper, we present the EMSO Generic Instrument Module (EGIM), a deployment ready multi-sensor instrumentation module, designed to measure physical, biogeochemical, biological and ecosystem variables consistently, in a range of marine environments, over long periods of time. Here, we describe the system, features, configuration, operation and data management. We demonstrate, through a series of coastal and oceanic pilot experiments that the EGIM is a valuable standard ocean observation module, which can significantly improve the capacity of existing ocean observatories and provides the basis for new observatories. The diverse examples of use included the monitoring of fish activity response upon oceanographic variability, hydrothermal vent fluids and particle dispersion, passive acoustic monitoring of marine mammals and time series of environmental variation in the water column. With the EGIM available to all the EMSO Regional Facilities, EMSO will be reaching a milestone in standardization and interoperability, marking a key capability advancement in addressing issues of sustainability in resource and habitat management of the oceans.
    Description: project EMSODEV (Grant agreement No 676555)
    Description: Published
    Description: 801033
    Description: 3A. Geofisica marina e osservazioni multiparametriche a fondo mare
    Description: JCR Journal
    Keywords: fixed-point observatories, multi-parametric monitoring, seafloor, water column, EMSO, EGIM, EOV ; seafloor observatories
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 7
    Publication Date: 2024-04-30
    Description: Accurate and traceable measurements are required to understand ocean processes, to address pressing societal challenges, such as climate change and to sustainably manage marine resources. Although scientific and engineering research has resulted in advanced methods to measure Essential Ocean Variables (EOVs) there is a need for cross comparison of the techniques and traceability to recognized standards. Metrological laboratories are experienced in accredited methods and assessment of methodology. An EU INFRAIA-02-2020: Integrating Activities for Starting Communities project MINKE (Metrology for Integrated marine maNagement and Knowledge-transfer nEtwork https:// minke.eu) brings European marine science and metrology Research Infrastructures together to identify synergies and create an innovative approach to Quality Assurance of oceanographic data. Quality depends both on the accuracy (that can be provided through the metrology component) and the completeness of the data sets. The collaboration between different Marine Research Infrastructures (RIs) places a fundamental role on assuring the completeness of the datasets, particularly at global scales. The MINKE project encourages enhancement through collaboration of national metrology laboratories and the oceanographic community. Metrological assessment of the accuracy and uncertainties within multidisciplinary ocean observations will provide data that are key to delivering policy information. Objectives across all the RIs are to facilitate ocean observation and build wider synergies. MINKE will investigate these synergies, then introduce metrology to the core of various EOV measurements. Currently the marine RIs cover laboratory and field operations, from the surface seafloor, coastal waters to deep sea, fixed ocean stations to ship and autonomous vehicle operations to ships of opportunity, and flux stations focusing on carbonate system variables. The nexus of these operations is the focal point for coordinated improvement of ocean observing methods. Measurement intercomparisons, traceability and uncertainty assessments should be at the core of the scientific observations. Specifically, MINKE will work with RIs and Metrology Institutes to improve the quality of dissolved oxygen, carbonate system, chlorophyll-fluorescence, ocean sound and current meter measurements, through access to metrology laboratories, Transnational Access and intercomparison studies across existing marine consortia and RIs. MINKE will also promote the development of absolute salinity observation, and improvements in marine litter measurements.
    Description: The authors declare financial support was received for the research, authorship, and/or publication of this article. This paper was a milestone within the MINKE project, which has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement 101008724 and under the grant agreement no. 731031(EMSO-link, https://cordis.europa. eu/project/id/731036). SH’s time was also covered by the UK Natural Environment Research Council Climate. Linked Atlantic Section Science (CLASS) project (NE/R015953/1) and iFADO project (Innovation in the Framework of the Atlantic Deep Ocean), which was supported with ERDF funds from the INTERREG Atlantic Area Programme under contract EAPA 165/2016 and grant agreement no. 862923 (AtlantECO, Atlantic Ecosystems Assessment, Forecasting & Sustainability). ICM-CSIC acknowledges the institutional support of the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S). PLG was supported by TechOceanS project, which received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 101000858. This output reflects only the author’s view, and the Research Executive Agency cannot be held responsible for any use that may be made of the information contained therein.
    Description: Published
    Description: 1192030
    Description: OSA4: Ambiente marino, fascia costiera ed Oceanografia operativa
    Description: JCR Journal
    Keywords: essential ocean variables (EOVs) ; metrology, ; ocean sound ; dissolved oxygen ; carbonate system ; chlorophyll-fluorescence ; current meters ; absolute salinity ; synergies between oceanography and metrology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 8
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    PANGAEA
    In:  Supplement to: Ramírez-Pérez, Marta; Gonçalves-Araujo, Rafael; Wiegmann, Sonja; Torrecilla, Elena; Bracher, Astrid; Piera, Jaume (2016): Towards cost-effective operational monitoring systems for complex waters: analyzing small-scale coastal processes with optical transmissometry. PLoS ONE, https://doi.org/10.1371/journal.pone.0170706
    Publication Date: 2023-01-13
    Description: The detection and prediction of changes in coastal ecosystems require a better understanding of the complex physical, chemical and biological interactions, which involves that observations should be performed continuously. For this reason, there is an increasing demand for small, simple and cost-effective in situ sensors to analyze complex coastal waters at a broad range of scales. In this context, this study seeks to explore the potential of beam attenuation spectra, c(lambda), measured in situ with an advanced-technology optical transmissometer, for assessing temporal and spatial patterns in the complex estuarine waters of Alfacs Bay (NW Mediterranean) as a test site. In particular, the information contained in the spectral beam attenuation coefficient was assessed and linked with different biogeochemical variables. The attenuation at lambda = 710 nm was used as a proxy for particle concentration, TSM, whereas a novel parameter was adopted as an optical indicator for chlorophyll a (Chl-a) concentration, based on the local maximum of c(lambda) observed at the long-wavelength side of the red band Chl-a absorption peak. In addition, since coloured dissolved organic matter (CDOM) has an important influence on the beam attenuation spectral shape and complementary measurements of particle size distribution were available, the beam attenuation spectral slope was used to analyze the CDOM content. Results were successfully compared with optical and biogeochemical variables from laboratory analysis of collocated water samples, and statistically significant correlations were found between the attenuation proxies and the biogeochemical variables TSM, Chl-a and CDOM. This outcome depicted the potential of high-frequency beam attenuation measurements as a simple, continuous and cost-effective approach for rapid detection of changes and patterns in biogeochemical properties in complex coastal environments.
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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  • 9
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    PANGAEA
    In:  Supplement to: Ramírez-Pérez, Marta; Twardowski, Michael S; Trees, Charles; Piera, Jaume; McKee, David (2018): Inversion of In Situ Light Absorption and Attenuation Measurements to Estimate Constituent Concentrations in Optically Complex Shelf Seas. Journal of Geophysical Research: Oceans, 123(1), 720-737, https://doi.org/10.1002/2017JC013453
    Publication Date: 2023-01-13
    Description: A deconvolution approach is presented to use spectral light absorption and attenuation data to estimate the concentration of the major nonwater compounds in complex shelf sea waters. The inversion procedure requires knowledge of local material‐specific inherent optical properties (SIOPs) which are determined from natural samples using a bio‐optical model that differentiates between Case I and Case II waters and uses least squares linear regression analysis to provide optimal SIOP values. A synthetic data set is used to demonstrate that the approach is fundamentally consistent and to test the sensitivity to injection of controlled levels of artificial noise into the input data. Self‐consistency of the approach is further demonstrated by application to field data collected in the Ligurian Sea, with chlorophyll (Chl), the nonbiogenic component of total suspended solids (TSSnd), and colored dissolved organic material (CDOM) retrieved with RMSE of 0.61 mg/m**3, 0.35 g/m**3, and 0.02 /m, respectively. The utility of the approach is finally demonstrated by application to depth profiles of in situ absorption and attenuation data resulting in profiles of optically significant constituents with associated error bar estimates. The advantages of this procedure lie in the simple input requirements, the avoidance of error amplification, full exploitation of the available spectral information from both absorption and attenuation channels, and the reasonably successful retrieval of constituent concentrations in an optically complex shelf sea.
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 10
    Publication Date: 2023-01-13
    Keywords: Absorption coefficient, 440 nm; Absorption coefficient, 443 nm; Absorption coefficient, 532 nm; Absorption coefficient, 676 nm; Alfacs2013_Phytoscope_2; Balear Sea; Beam attenuation at 710 nm; Beam attenuation peak at 685 nm; Beam attenuation spectral slope; Chlorophyll a; CTD, Sea & Sun Technology, Germany, 48M; DATE/TIME; DEPTH, water; Fluorescence spectrometer, AquaLog, HORIBA JobinYvon; Fucoxanthin; Gravimetric analysis, Röttgers et al. (2014); High Performance Liquid Chromatography (HPLC), Barlow et al. (1997); Laser In-Situ Scattering Transmissometer, LISST-100X, SEQUOIA Scientific, Inc.; LATITUDE; LONGITUDE; MULT; Multiple investigations; Particle size distribution slope; Peridinin; Salinity; Spectrophotometry, filter pad technique; Suspended matter, total; Temperature, water; VIPER, Hyperspectral VIS photometer, TriOS
    Type: Dataset
    Format: text/tab-separated-values, 388 data points
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