Blar i NIVA Open Access Archive på forfatter "Hancke, Kasper"
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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 ... -
Effects of waterlogging and elevated salinity on the allocation of photosynthetic carbon in estuarine tidal marsh: a mesocosm experiment
Li, Ya-Lei; Ge, Zhen-Ming; Xie, Li-Na; Li, Shi-Hua; Tan, Li-Shan; Hancke, Kasper (Peer reviewed; Journal article, 2022)Background and aim Coastal marshes and wetlands hosting blue carbon ecosystems have shown vulnerability to sea-level rise (SLR) and its consequent effects. In this study, we explored the effects of waterlogging and elevated ... -
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 ... -
"Hanging gardens" - comparing fauna communities in kelp farms and wild kelp forests
Bekkby, Trine; Torstensen, Ragnhild Ryther Grimm; Grünfeld, Lars Andreas Holm; Gundersen, Hege; Fredriksen, Stein; Rinde, Eli; Christie, Hartvig C; Walday, Mats Gunnar; Andersen, Guri Sogn; Brkljacic, Marijana Stenrud; Neves, Luiza S.; Hancke, Kasper (Peer reviewed; Journal article, 2023)A growing need for food is causing increased interest for seaweed farming globally. This requires knowledge of the industry’s effects on the marine environment. We therefore aimed to explore the communities hosted by a ... -
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, ... -
KELPMAP-Vega: Metodeutvikling for kartlegging av tareskog ved bruk av droner og satellittbilder (feltrapport)
Gundersen, Hege; Hancke, Kasper; Poulsen, Robert Nøddebo; Buls, Toms; Ghareeb, Medyan; Christie, Hartvig C; Kile, Maia Røst; Arvidsson, Karoline Slettebø; Kvile, Kristina Øie (NIVA-rapport;7790-2022, Research report, 2022)Rapporten er en del-leveranse i prosjektet "Metodeutvikling for kartlegging av tare ved bruk av droner og satellittbilder" og beskriver metoder for innsamling av høyoppløselige bilder ved hjelp av droner og generering av ... -
Kunnskapsoppsummering om aktiviteter som forstyrrer karbonlagre i havet
Hjermann, Dag Øystein; Rudjord, Zofia Czyczula; Borgersen, Gunhild; Gundersen, Hege; Bhakta, Debhasish; Hancke, Kasper (NIVA-rapport;7828-2023, Research report, 2023)Marine karbonlagre har en betydelig rolle i karbonkretsløpet, både som lager for karbon og for kontinuerlig opptak av karbon. Rapporten fokuserer på fysisk forstyrrelse/ødeleggelse av karbonlagre, og spesielt på data og ... -
Kunnskapsoppsummering om marine områder som er viktige for karbonlagring
Hancke, Kasper; Andersen, Guri Sogn; Gundersen, Hege; Kvile, Kristina Øie; Trannum, Hilde Cecilie; Borgersen, Gunhild (NIVA-rapport;7788-2022, Research report, 2022)Denne rapporten presenterer en kunnskapsoppsummering om marine områder og naturtyper som er viktige for karbonlagring i Norge. Oppsummeringen omfatter sammenstilling av eksisterende kunnskap om naturtypenes utbredelse og ...