Blar i forfatter "McKee, David"

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    • Artificial light during the polar night disrupts Arctic fish and zooplankton behavior down to 200 m depth 

      Berge, Jørgen; Geoffroy, Maxime; Daase, Malin; Cottier, Finlo Robert; Priou, Pierre; Cohen, Jonathan H.; Johnsen, Geir; McKee, David; Kostakis, I; Renaud, Paul E.; Vogedes, Daniel Ludwig; Anderson, Philip J.; Last, Kim; Gauthier, Stephane (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-05)
      For organisms that remain active in one of the last undisturbed and pristine dark environments on the planet—the Arctic Polar Night—the moon, stars and aurora borealis may provide important cues to guide distribution and behaviours, including predator-prey interactions. With a changing climate and increased human activities in the Arctic, such natural light sources will in many places be masked by ...

    • Estimating Surface Concentrations of Calanus finmarchicus Using Standardised Satellite-Derived Enhanced RGB Imagery 

      McCarry, Cait L.; Basedow, Sünnje Linnéa; Davies, Emlyn John; McKee, David (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-08)
      Calanus finmarchicus is a keystone zooplankton species that is commercially harvested and is critical in sustaining many important fisheries in the North Atlantic. However, due to their patchy population distributions, they are notoriously difficult to map using traditional ship-based techniques. This study involves the use of a combined approach of standardized ocean colour imagery and radiative ...

    • The hidden influence of large particles on ocean colour 

      Davies, Emlyn John; Basedow, Sünnje Linnéa; McKee, David (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-17)
      Optical constituents in the ocean are often categorized as water, phytoplankton, sediments and dissolved matter. However, the optical properties of seawater are influenced, to some degree, by scattering and absorption by all particles in the water column. Here we assess the relevant size ranges for determining the optical properties of the ocean. We present a theoretical basis supporting the hypothesis ...

    • Inherent Optical Properties‐Reflectance Relationships Revisited 

      Prejato, Marilisa Lo; McKee, David; Mitchell, Cathrine (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-31)
      Understanding the relationship between remote sensing reflectance, R<sub>rs</sub>(λ) and the inherent optical properties (IOPs) of natural waters is potentially a key to improving our ability to determine biogeochemical constituents from radiometric measurements. These relationships are usually described as a function of absorption, <i>a</i>(λ), and backscattering, b<sub>b</sub>(λ), coefficients, ...

    • Neural networks to retrieve in water constituents applied to radiative transfer models simulating coastal water conditions 

      Hadjal, Madjid; Paterson, Ross; McKee, David (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-16)
      Estimation of chlorophyll (CHL) using ocean colour remote sensing (OCRS) signals in coastal waters is difficult due to the presence of two other constituents altering the light signal: coloured dissolved organic material (CDOM) and mineral suspended sediments (MSS). Artificial neural networks (NNs) have the capacity to deal with signal complexity and are a potential solution to the problem. Here ...

    • Remote sensing of zooplankton swarms 

      Basedow, Sünnje Linnéa; McKee, David; Lefering, Ina; Gislason, Astthor; Daase, Malin; Trudnowska, Emilia; Egeland, Einar Skarstad; Choquet, Marvin; Falk-Petersen, Stig (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-01-24)
      Zooplankton provide the key link between primary production and higher levels of the marine food web and they play an important role in mediating carbon sequestration in the ocean. All commercially harvested fish species depend on zooplankton populations. However, spatio-temporal distributions of zooplankton are notoriously difficult to quantify from ships. We know that zooplankton can form large ...

    • Spectral and RGB analysis of the light climate and its ecological impacts using an all-sky camera system in the Arctic 

      Grant, Stephen Denis; Johnsen, Geir; McKee, David; Zolich, Artur Piotr; Cohen, Jonathan H. (Journal article; Tidsskriftartikkel, 2023-06-21)
      The ArcLight observatory provides an hourly continuous time series of all-sky images providing light climate data (intensity, spectral composition, and photoperiod) from the Arctic (Svalbard at 79°N). Until recently, no complete annual time series of light climate relevant for biological processes has been provided from the high Arctic because of insufficient sensitivity of commercial light sensors ...