iMeltOcean-ice shelf Interaction and channelized Melting in

Dronning Maud Land

Laura de Steur, Tore Hatterman, Geir Moholdt (NPI),

Elin Darelius (UiB), Qin Zhou, Ole Anders Nøst (APN)

Willem J.V.D. Berg (IMAU, Netherlands), Thamban Meloth (NCAOR, India)

10 MNoK – 2019-2022

Ice shelves are thinning at an accelerating rate- mainly due to ocean interactions

Pritchard, 2012; Paolo 2015; the IMBIE team 2018

FFField activity

Fimbul Ice Shelf moorings: 2010-2020 (M1, M2, M3)ApRES radar at Fimbul and Nivl Ice shelves: 2017-2020Open ocean moorings: 2019-2020 (DML1, DML2, DML3)

TROLL

Primary objective

Quantify the dominant ocean-ice shelf processes responsible for basal meltingin Dronning Maud Land

Secondary objectives

1. Quantify the dynamics of the Antarctic Slope Front associated withepisodic warm water pulses and melting under the ice shelves Fimbulisen and Nivlisen

2. Study basal channel evolution and derive melt rates from in-situ data and remote sensing

3. Improve parametrization of fine-scale coupled ocean-ice shelf processes in climate models

WP1 Oceanographic processes governing the exchange under Fimbul Ice Shelf—> PhD student (NPI/UiB)

Work packages

WP2 Observations of ice-shelf basal melting—> Postdoc (NPI/UiB)

WP3 Modeling of small-scale ice-ocean interactions—> Postdoc (APN)

Dissemination

Papers

• 7 papers from the 3 Work packages in peer-reviewed journals like

J. of Geophys. Res, Geophys. Res. Lett., Cryosphere, Ocean Mod.

Conferences

• International science conferences like Ocean Sciences, EGU, AGU

• Topical smaller workshops like SOOS, FRISP, and IGS workshops

• Project workshop at NPI in 2020

Public Outreach

• Posts on www.instagram.com/oceanseaicenpi: 3200+ followers

• Public science days/activities (e.g. Forskningsdagene)

• Posts from fieldwork/expeditions on Field blog and Facebook

Data Management

Format and Metadata

• Processed and quality-controlled. Converted to NetCDF format.

• Metadata according to international Climate Forecast (CF) conventions

(http://cfconventions.org/).

Data portal

• Full resolution processed data sets will be made public available at the Norwegian Polar Institute (NPI) at https://data.npol

• Each data set will obtain a doi and will be described in a summary

• Raw data will also be archived at the NPI

• The NPI data portal is part of Norwegian Marine Data Centre (NMDC)

What

• Oceanographic data (T, S, U,V) from ocean and ice-shelf moorings

• glacial data (ice thickness)

Outcomes and impacts

Truly unique data set: First concurrent measurements of slope front dynamics, ice shelf cavity circulation and basal melt rates

The interdisciplinary approach will warrant fundamental new knowledge of regional to fine-scale ocean-ice shelf processes in Dronning Maud Land.

Improve climate models and reduce uncertainties in climate projections andthereby allow policy makers to take measures to reduce sea level rise.