An Empirically Derived Trimodal Parameterization of Underwater Light in Complex Coastal Waters – A Case Study in the North Sea

Wollschläger, Jochen; Tietjen, Beke; Voß, Daniela

doi:10.3389/fmars.2020.00512

Cited by 6 publications

(4 citation statements)

References 36 publications

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“…Inclusion of CDOM is an obvious next step to take. While there are many possible ways of achieving this, for example, through modeling (e.g., Kerimoglu et al, 2020, most recently) or via an inverse relation with salinity (e.g., Wollschläger et al, 2020), it is worth noting that the same method by which we introduce SPM in this study is in theory applicable for satellite-derived CDOM data as well. Such is available for example, from GlobColour (http://www.globcolour.info/).…”

Section: Validity Of the Methodsmentioning

confidence: 99%

The North Sea Light Climate: Analysis of Observations and Numerical Simulations

Thewes

Stanev

2021

JGR Oceans

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The light climate in coastal areas is influenced by multiple factors, among them plankton biomass, and dissolved and suspended matter. Although these factors influence each other, they are still independent from each other to a certain degree, as they have different origins. Over the past decades, there have been many successful attempts to model links between phytoplankton growth and other optically active water constituents (e.g., Cahill et al., 2008;Mobley et al., 2015;Xiu & Chai, 2014). However, most attempts are challenging for long-term analysis, due to their immense complexity and computational resource constraints. There may be not enough information about all involved processes and state variables, or the model might be too cumbersome to handle over multi-year computations.Several studies indicate a decrease in water clarity over the twentieth century. These decreases have been linked to colored dissolved organic matter (CDOM)

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Section: Validity Of the Methodsmentioning

confidence: 99%

The North Sea Light Climate: Analysis of Observations and Numerical Simulations

Thewes

Stanev

2021

JGR Oceans

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“…Although the research was related to coastal areas in general, focus area of the project was the North Sea as an example for a highly utilized shelf sea. Aim of COD was to describe the light availability during the last 100 years on different spatial scales, and to make projections about the future using biogeochemical models with improved light parameterization (Thewes et al, 2020;Wollschläger et al, 2020). Furthermore, the work conducted in the project helped to refine established bio-optical concepts (Pitarch et al, 2019).…”

Section: Coastal Ocean Darkeningmentioning

confidence: 99%

The Spiekeroog Coastal Observatory: A Scientific Infrastructure at the Land-Sea Transition Zone (Southern North Sea)

et al. 2022

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Coastal observatories are key to improve the understanding of processes within the coastal area and their interactions with regional and global environmental changes. The land-sea transition zone is an essential area that allows research on unique scientific questions under anthropogenic and natural influences. Amid the Wadden Sea UNESCO world natural heritage site – the largest tidal flat region worldwide – the barrier island Spiekeroog is an excellent location for an observatory studying land-sea interactions. The integrated Spiekeroog Coastal Observatory (SCO) operated by the Institute for Chemistry and Biology of the Marine Environment (ICBM, University of Oldenburg) is dedicated to interdisciplinary marine and terrestrial ecosystem research. Its position within the tidal area and the multitude of research-field addressed establishes the SCO as a unique coastal observatory with the potential to identify patterns in long-term variability and simultaneously understanding short-term changes. The establishment of the Time-Series Station (TSS) Spiekeroog in a tidal channel west of Spiekeroog back in 2002 laid the foundation of the SCO. Since then, the observatory is expanding continuously and is now representing a valuable asset supporting education, industry, government, and environmental conservation efforts in the area. Summing up the infrastructure and technical components, the importance of the SCO is evident, and individual projects greatly benefit from the collaboration with the partners in and the elements of the SCO. Harmonizing the infrastructure and competences of contributing partners will be a next step to further consolidate the SCO. A challenge poses the maintenance of the SCO based on projects, which is focused on the addition of new facilities, not maintaining, refurbishing, or (if necessary) deconstructing existing infrastructure. Therefore, structural support and funding opportunities not linked to projects but aiming to sustain observational capacities are required.

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“…The investigation of such contemporaneous measurements is demonstrated in the work of Rehm and Mobley (2013) where they estimated absorption and backscattering coefficients to an accuracy of ±0.01 m −1 and ±0.0005 m −1 respectively, based on hyperspectral vertical radiometric observations and concurrent measurements of the beam attenuation coefficient at 650 nm in optically simple oligotrophic waters. In the more optically complex waters where OAS do not covary with chl-a, Wollschläger et al (2020) obtained a moderately complex parametrization of the underwater light field based on hyperspectral light measurements. Such parametrizations could be strongly improved by accounting for seasonal and regional variation based on data coming from hyperspectral Argo-floats.…”

Section: Future Prospectsmentioning

confidence: 99%

Radiometry on Argo Floats: From the Multispectral State-of-the-Art on the Step to Hyperspectral Technology

Jemai¹,

Wollschläger²,

Voß³

2021

Front. Mar. Sci.

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Over the past two decades, robotic technology such as Argo floats have revolutionized operational autonomous measurement of the oceans. Recently, Biogeochemical Argo floats (BGC-Argo floats) have measured optical and biogeochemical quantities down to a depth of 2,000 m. Among these parameters, are measurements of the underwater light field from which apparent optical properties (AOPs), such as the diffuse attenuation coefficient for downwelling irradiance Kd(λ), can be derived. Presently, multispectral observations are available on this platform at three wavelengths (with 10–20 nm bandwidths) in the ultraviolet and visible part of the spectrum plus the Photosynthetically Available Radiation (PAR; integrated radiation between 400 and 700 nm). This article reviews studies dealing with these radiometric observations and presents the current state-of-the-art in Argo radiometry. It focus on the successful portability of radiometers onboard Argo float platforms and covers applications of the obtained data for bio-optical modeling and ocean color remote sensing. Generating already high-quality datasets in the existing configuration, the BGC-Argo program must now investigate the potential to incorporate hyperspectral technology. The possibility to acquire hyperspectral information and the subsequent development of new algorithms that exploit these data will open new opportunities for bio-optical long-term studies of global ocean processes, but also present new challenges to handle and process increased amounts of data.

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An Empirically Derived Trimodal Parameterization of Underwater Light in Complex Coastal Waters – A Case Study in the North Sea

Cited by 6 publications

References 36 publications

The North Sea Light Climate: Analysis of Observations and Numerical Simulations

The North Sea Light Climate: Analysis of Observations and Numerical Simulations

The Spiekeroog Coastal Observatory: A Scientific Infrastructure at the Land-Sea Transition Zone (Southern North Sea)

Radiometry on Argo Floats: From the Multispectral State-of-the-Art on the Step to Hyperspectral Technology

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