• A low-cost remotely operated vehicle (ROV) with an optical positioningsystem for under-ice measurements and sampling 

      Lund-Hansen, Lars Chresten; Juul, Thomas; Eskildsen, Tor Dam; Hawes, Ian; Sorrell, Brian; Melvad, Claus; Hancke, Kasper (Journal article; Peer reviewed, 2018)
      Here we describe the design, performance and field tests of a lightweight (13.1 kg), low-cost (15.000 USD), and portable remotely operated vehicle (ROV) of dimensions 55 × 43 × 34 cm (L × H × W), with a new optical based ...
    • Blått-karbon: Klimatilpasning, karbonopptak og langtidslagring av karbon i blå skog. Års- og workshoprapport for 2017. 

      Frigstad, Helene; Gundersen, Hege; Hancke, Kasper; Andersen, Guri Sogn; Bekkby, Trine; Tveiten, Lise Ann (NIVA-rapport;7213, Research report, 2017)
      Blått-karbon prosjektet har til hensikt å lage en oppdatert oversikt over karbonkretsløp i blå skog (her: tare, ålegras og tang) i de nordiske landene. Rapporten presenterer foreløpige resultater og fremdrift i prosjektet ...
    • Blue Carbon eDNA – A novel eDNA method to trace macroalgae carbon in marine sediments 

      Anglès d'Auriac, Marc; Hancke, Kasper; Gundersen, Hege; Frigstad, Helene; Borgersen, Gunhild (NIVA-rapport;7648, Research report, 2021)
      Blue forests, such as rockweed beds and seagrass meadows, are considered important natural sinks for carbon and thereby play a vital role in climate regulation, mitigation and adaptation. Kelp forests grow on rocky bed ...
    • COASTAL HABITAT MAPPING WITH UAV MULTI-SENSOR DATA: AN EXPERIMENT AMONG DCNN-BASED APPROACHES 

      Liu, Yi; Liu, Qinghui; Sample, James Edward; Hancke, Kasper; Salberg, Arnt Børre (Peer reviewed; Journal article, 2022)
      With recent abundant availability of high resolution multi-sensor UAV data and rapid development of deep learning models, efficient automatic mapping using deep neural network is becoming a common approach. However, with ...
    • Detection of macroplastic on beaches using drones and object-based image analysis 

      Torsvik, Bjørn Maaløe; Poulsen, Robert Nøddebo; van Bavel, Bert; Gundersen, Hege; Hancke, Kasper (NIVA-rapport;7553, Research report, 2020)
      This pilot study demonstrates UAV-based image collection being a promising technology for plastic detection in beach zones and we recommend object-based image analysis and UAV-based data collection being further developed ...
    • Dispersal and Deposition of Detritus From Kelp Cultivation 

      Broch, Ole Jacob; Hancke, Kasper; Ellingsen, Ingrid Helene (Peer reviewed; Journal article, 2022)
      A high resolution coastal and ocean hydrodynamic model system was used to investigate the transport and deposition patterns of Particulate Organic Matter (POM) from kelp farmed at three locations of different properties: ...
    • Effects of increased irradiance on biomass, photobiology, nutritional quality, and pigment composition of Arctic sea ice algae 

      Lund-Hansen, Lars Chresten; Hawes, Ian; Hancke, Kasper; Salmansen, Nicole; Nielsen, Johanne Raakjær; Balslev, Laura; Sorrell, Brian K (Peer reviewed; Journal article, 2020)
      Ice algae are key contributors to primary production and carbon fixation in the Arctic, and light availability is assumed to limit their growth and productivity. We investigated photo-physiological responses in sea ice ...
    • Erosion Dynamics of Cultivated Kelp, Saccharina latissima, and Implications for Environmental Management and Carbon Sequestration 

      Fieler, Reinhold; Greenacre, Michael; Matsson, Sanna; Neves, Luiza Saliba; Forbord, Silje; Hancke, Kasper (Peer reviewed; Journal article, 2021)
      A growing trend of interest for the cultivation of kelp is driven by predictions for high global demands of important commodities, which require the development of alternative supplies of natural resources. In this study ...
    • Extreme Low Light Requirement for Algae Growth Underneath Sea Ice: A Case Study From Station Nord, NE Greenl and 

      Hancke, Kasper; Lund-Hansen, Lars C.; Lamare, Maxim L.; Pedersen, Stine Højlund; King, Martin D.; Andersen, Per; Sorrell, Brian K. (Journal article; Peer reviewed, 2018)
      Microalgae colonizing the underside of sea ice in spring are a key component of the Arctic foodweb as they drive early primary production and transport of carbon from the atmosphere to the ocean interior. Onset of the ...
    • Frisk Oslofjord. Undersøkelser på grunt vann - med utprøving av ny teknologi 

      Walday, Mats Gunnar; Rinde, Eli; Andersen, Guri Sogn; Hancke, Kasper; Moy, Siri Røang (NIVA-rapport;7642, Research report, 2021)
      Prosjektet Frisk Oslofjord skal samle kunnskap som skal gi grunnlag for bærekraftig forvaltning, styrking av de marine ressursene og det marine miljøet. NIVAs del i arbeidet omfattet utprøving av ny teknologi for undersøkelser ...
    • Genetic heterogeneity of two bioeconomically important kelp species along the Norwegian coast 

      Evankow, Ann; Christie, Hartvig C; Hancke, Kasper; Brysting, Anne Krag; Junge, Claudia; Fredriksen, Stein; Thaulow, Jens (Journal article; Peer reviewed, 2019)
      Knowledge of genetic diversity among wild populations is becoming increasingly important as more species are recognized for their bioeconomic value. Industrialization of natural resources, such as kelp in the marine shallow ...
    • Global estimates of the extent and production of macroalgal forests 

      Duarte, Carlos M.; Gattuso, Jean-Pierre; Hancke, Kasper; Gundersen, Hege; Filbee-Dexter, Karen; Pedersen, Morten Foldager; Middelburg, J.J.; Burrows, Michael T.; Krumhansl, Kira A.; Wernberg, Thomas; Moore, Pippa J.; Pessarrodona, Albert; Ørberg, Sarah; Pinto, Isabel Sousa; Assis, Jorge; Queirós, Ana M.; Smale, Dan A; Bekkby, Trine; Serrão, Ester A.; Krause-Jensen, Dorte (Peer reviewed; Journal article, 2022)
      Macroalgal habitats are believed to be the most extensive and productive of all coastal vegetated ecosystems. In stark contrast to the growing attention on their contribution to carbon export and sequestration, understanding ...
    • Highly Productive Ice Algal Mats in Arctic Melt Ponds: Primary Production and Carbon Turnover 

      Hancke, Kasper; Kristiansen, Svein; Lund-Hansen, Chresten (Peer reviewed; Journal article, 2022)
      Arctic summer sea ice extent is decreasing and thinning, forming melt ponds that cover more than 50% of the sea ice area during the peak of the melting season. Despite of this, ice algal communities in melt ponds are ...
    • Kelp carbon sink potential decreases with warming due to accelerating decomposition 

      Filbee-Dexter, Karen; Feehan, Colette J.; Smale, Dan A.; Krumhansl, Kira A.; Augustine, Skye; de Bettignies, Florian; Burrows, Michael T.; Byrnes, Jarrett E.K.; Campbell, Jillian; Davoult, Dominique; Dunton, Kenneth H.; Franco, Joao N.; Garrido, Ignacio; Grace, Sean P.; Hancke, Kasper; Johnson, Ladd E.; Konar, Brenda; Moore, Pippa J.; Norderhaug, Kjell Magnus; O'Dell, Alasdair; Pedersen, Morten F.; Salomon, Anne K.; Sousa-Pinto, Isabel; Tiegs, Scott; Yiu, Dara; Wernberg, Thomas (Peer reviewed; Journal article, 2022)
      Cycling of organic carbon in the ocean has the potential to mitigate or exacerbate global climate change, but major questions remain about the environmental controls on organic carbon flux in the coastal zone. Here, we ...
    • Kelp forest distribution in the Nordic region 

      Kvile, Kristina Øie; Andersen, Guri Sogn; Baden, Susanne; Bekkby, Trine; Bruhn, Annette; Geertz-Hansen, Ole; Hancke, Kasper; Hansen, Jørgen L.S.; Krause-Jensen, Dorte; Rinde, Eli; Steen, Henning; Wegeberg, Susse; Gundersen, Hege (Peer reviewed; Journal article, 2022)
      Kelp forests are productive coastal ecosystems that provide a range of ecosystem services. Mapping the distribution and area occupied by kelp forests is a critical step to identify their ecosystem functions and services, ...
    • Miljøpåvirkninger av taredyrking og forslag til utvikling av overvåkingsprogram 

      Hancke, Kasper; Broch, Ole Jacob; Olsen, Yngvar; Bekkby, Trine; Hansen, Pia Kupka; Fieler, Reinhold; Attard, Karl; Borgersen, Gunhild; Christie, Hartvig (NIVA-rapport;7589-2021, Report, 2021)
      Forskningsprosjektet KELPPRO (2017-2020) har gjennom feltundersøkelser, laboratorieforsøk og numerisk modellering undersøkt miljøpåvirkninger av taredyrking på økosystemene i de åpne vannmassene og på havbunnen, og evaluert ...
    • Nordic Blue Carbon Ecosystems: Status and Outlook 

      Krause-Jensen, Dorte; Gundersen, Hege; Björk, Mats; Gullström, Martin; Dahl, Martin; Asplund, Maria E.; Boström, Christoffer; Holmer, Marianne; Banta, Gary T.; Graversen, Anna Elizabeth Løvgren; Pedersen, Morten Foldager; Bekkby, Trine; Frigstad, Helene; Skjellum, Solrun Figenschau; Thormar, Jonas; Gyldenkærne, Steen; Howard, Jennifer; Pidgeon, Emily; Ragnarsdóttir, Sunna Björk; Mols-Mortensen, Agnes; Hancke, Kasper (Peer reviewed; Journal article, 2022)
      Vegetated coastal and marine habitats in the Nordic region include salt marshes, eelgrass meadows and, in particular, brown macroalgae (kelp forests and rockweed beds). Such habitats contribute to storage of organic carbon ...
    • Taredyrking - mulige miljøeffekter, synergier og konflikter med andre interesser i kystsonen 

      Hancke, Kasper; Bekkby, Trine; Gilstad, Mona; Chapman, Annelise; Christie, Hartvig (NIVA-rapport;7265, Research report, 2018)
      Man ønsker å allerede tidlig i utviklingen av tareindustrien ha fokus på miljøeffekter, både i vannmassene og på havbunnen. Per i dag må vi nøye oss med å vurdere miljøeffekter av kommersiell taredyrking og tilknyttede ...
    • The kelp cultivation potential in coastal and offshore regions of Norway 

      Broch, Ole Jacob; Alver, Morten; Bekkby, Trine; Gundersen, Hege; Forbord, Silje; Handå, Aleksander; Skjermo, Jorunn; Hancke, Kasper (Journal article; Peer reviewed, 2019)
      We have evaluated the cultivation potential of sugar kelp (Saccharina latissima) as a function of latitude and position (near- and offshore) along the Norwegian coast using a coupled 3D hydrodynamic-biogeochemical-kelp ...
    • Variation in population structure and standing stocks of kelp along multiple environmental gradients and implications for ecosystem services 

      Gundersen, Hege; Rinde, Eli; Bekkby, Trine; Hancke, Kasper; Gitmark, Janne K; Christie, Hartvig (Peer reviewed; Journal article, 2021)
      There is an increasing focus on ecosystem services provided by macroalgae worldwide, many which depend on its structural and morphological characteristics. Here we investigated how characteristics of canopy kelp plants of ...