Anhaus, Philipp

Katlein, Christian

Nicolaus, Marcel

Planat, Noémie

Schiller, Martin

English

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1st ARTofMELT 2023 Open Science Conference22 - 24 April 2024, Stockholm University, SwedenARTofMELT 2023 WP8 – Sea ice physicsPhilipp Anhaus¹, Noémie Planat², Martin Schiller¹Christian Katlein¹, Marcel Nicolaus¹¹ Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany² Department of Atmospheric and Oceanic Sciences, McGill University, Montréal, Québec, Canadadiffuse radiationdiffuse reflectionabsorptionscatteringmelt ponddiffuse transmissionInteraction solar radiation and ice-ocean systemSea-ice melt• Surface / snow melt• Bottom meltInfluence of melt on sea-ice opticalproperties• Surface albedo• Transmitted radiationExpedition webpage:Study areaROV holeLaser scannerpositionGEM-2 calibrationsiteTransectsGEM-2MagnaprobeAlbedowandROV gridGPS stationsROV transpondersLaser scanner reflectorsDrone images11 June9 June8 June7 June6 June5 June4 June2 June29 May21 May18 May16 May Floe 2Floe 1Total ice thickness & snow depthItkin et al., 2023Manual measurementsPainting: Ida RödénTotal ice thickness5 surveysFloe 1• 1x gridFloe 2• 3x transect• 1x gridSnow depth8 surveysFloe 1: • 1x gridFloe 2:• 6x transect• 1x gridTerrestrial laser scannerROV holeRidges330 m150 m• Changes in surface topography during melt• Surface roughness estimates (ridges)• Snow depth (reference magnaprobe)Surface albedo• Ratio of incident and reflected solar irradiance• Albedo= „whiteness“• „Diffuse reflectivity of surface“α =EreflEinKatlein (2019)Albedo-wandAlbedo8 surveysFloe 1: • 1x gridFloe 2:• 6x transect• 1x gridRemotely operated vehicle (ROV)Photo: Åsa Lindgren (SPRS) 12 surveysFloe 1: • 3x gridFloe 2:• 9x gridTransmittanceTransmitted radiationrelative to incomingradiation:T =EtransEinMultibeamAcoustic echosounder(multibeam)• Map under-ice topography• Retrieve ice draft• Areas of negative freeboardROV holeBiology• Floe 1: chl a ranges from 0.1 to 0.5 μg / l (May 18-20)• Floe 2: chl a ranges from 10 and 15 μg / l (May 31, June 1-9)Time 2023-05-20Time 2023-06-08• Chlorophyll a concentration from ROV ECO-tripletBiology• Underwater Hyperspectral Imager (UHI)• RGB images, spectral radiance, NDIs, algae• Contact: benjamin.lange@ngi.noData sets• ROV• Bio-optical• Ice bottom topography• Physical oceanography• Images and videos• Surface albedo, snow depth, ice thickness• Surface topography• Drone images• Ice observations (ice obs, ship´s bridge)ROVIce obsPlansYear-round melting and freezing processes• Multibeam data & MOSAiCChanges in optical properties due to melting• Changes of snow affect scattering and absorption of radiation(snow grain size, wetness, WP9)• Biomass affects absoprtion of radiation (in-ice biology, icecores, WP2+6)Albedo from drone images & albedo-wand(Interdisciplinary) collaborationsThank you!Photo: Paul Zieger (Stockholm University)

ARTofMELT 2023 WP8 - Sea ice physics

https://epic.awi.de/id/eprint/58680/1/ARTofMELT_summary_Stockholm_2024.pdf

ARTofMELT 2023 WP8 - Sea ice physics

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