Long-term monitoring of the Filchner Ice Shelf system


Contact
Hartmut.Hellmer [ at ] awi.de

Abstract

During the austral summer seasons 2015/16 an 2016/17, the Alfred Wegener Institute in collaboration with the British Antarctic Survey and the University of Bergen drilled four access holes through 850-900-m thick ice on both sides of the southern Filchner Ice Shelf (FIS) and three holes through about 600-m thick ice on its northeastern part, respectively. The holes have been equipped with current meters, temperature and salinity sensors, and thermistor chains, distributed over the whole water column and within the ice to monitor the hydrography in the cavity, the exchange of heat and salt across the boundary layer close to the ice shelf, and the thermal conditions in the ice for a maximum period of five years (depending on battery lifetime). Since the instruments are attached to an inductive cable, data are stored at the ice shelf surface and transmitted via Iridium to AWI every night. First analysis shows that two regimes exist underneath FIS with the southern regime similarly exhibiting a two-layered water column with a highly variable pycnocline and the northern regime showing a stronger zonal variability and the inflow of warmer waters at mid-depth. The whole FIS cavity is subject to strong diurnal and semidiurnal tidal forcing causing pronounced forthnighty resonances with velocities up to 40 cm/s and a daily displacement of the pycnocline by several tens of meters at the southern sites.



Item Type
Conference (Talk)
Authors
Divisions
Primary Division
Programs
Primary Topic
Research Networks
Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
OASIIS-Observing and Understanding the Ocean beneath Antarctic Sea Ice and Ice Shelves, Bremerhaven.
Eprint ID
44973
Cite as
Hattermann, T. , Schröder, M. and Hellmer, H. (2017): Long-term monitoring of the Filchner Ice Shelf system , OASIIS-Observing and Understanding the Ocean beneath Antarctic Sea Ice and Ice Shelves, Bremerhaven .


Share

Research Platforms

Campaigns


Actions
Edit Item Edit Item