Expedition organization: Martin Jakobsson, Stockholm University Larry Mayer, CCOM, University of New Hampshire Alan Mix, Oregon State University Participating organizations: Stockholm University, Sweden CCOM, University of New Hampshire, USA Oregon State University, USA British Antarctic Survey, UK Greenland Institute of Natural Resources, Greenland Aarhus University, Denmark Logistical support: Swedish Polar Research Secretariat Swedish Maritime Administration
Ryder 2019 Expedition History and Stability of Ryder Glacier and the Marine Cryosphere of Southern Lincoln Sea
Ryder Glacier Has a floating ice tongue Is a surge type glacier Was first surveyed by Lauge Koch in 1917
Fahnestock et al., 1992
• Arctic Ocean 1991
• Arctic Ocean 1996
• Arctic Ocean 2001
• Arctic Ocean 2002
• ACEX – 2004
• Beringia 2005
• AGAVE 2007
• LOMROG 2007
• ASCOS 2008
• Multibeam SAT (2007, 2008)
• LOMROG 2009
• EAGER 2011
• LOMROG 2012
• SWERUS-C3 (2014)
• Petermann (2015)
• Arctic Ocean 2016
Multibeam
Multibeam + midwater
Ryder 2019
Petermann 2015
IB Oden Expeditions
Swedish Research Council (VR) projects: History and Stability of the Marine Cryosphere in Northwestern Greenland, Martin Jakobsson PI (2017-2020) Late Quaternary chronology of Arctic Ocean sediments, Matt O’Regan PI (2017-2020) Melting marine gas hydrates – Predicting seafloor methane gas release in a warming world, Christian Stranne PI (2019-2022) FORMAS project: Ocean-induced changes at calving glacier margins: data, uncertainty, and simulation, Nina Kirchner PI (2018-2020) Strategic support from Stockholm University and Univ. of New Hampshire for ship operational costs Pending NSF application, PI Alan Mix
Swedish components of the Ryder 2019 Expedition are linked to the following projects:
There will be an opportunity to apply for additional Swedish components on the Ryder 2019 Expedition. To be announced by SPRS There are opportunities to bring autonomous observatory devices that can be operated by SPRS technicians.
Ryder 2019 Expedition sub-themes and logistical work packages (WP):
Scientific Subthemes 1. Sea ice 2. Glacial history and dynamics 3. Oceanography 4. Arctic Ocean sediment
chronology 5. Paleoceanography 6. Gas hydrates and permafrost 7. Sea level
Shipboard Work Packages 1. Geophysical mapping (GM) 2. Autonomous/remote mapping (AM) 3. Water column imaging (WC) 4. Sediment coring (SC) 5. Sediment processing (SP) 6. Oceanography (OC) 7. Land mapping (LM)
Ryder 2019 Expedition Scientific purpose and aims • Patterns and causes of sudden dynamic changes of the marine cryosphere
• Potential contribution to global sea-level rise from the northern sector of the
Greenland Ice Sheet in a warming climate
• History and dynamic roles of floating ice shelves and sea ice
• Geological control on the retreat dynamics of the northern Greenland Ice Sheet
16/11/2018 /Martin Jakobsson, Department of Geological Sciences
Icebreaker Oden Petermann Expedition 2015
The Ryder 2019 Expedition continues from The Petermann 2015 Expedition with IB Oden
Sweden-US collaboration around IB Oden
Sediment coring Piston/gravity/multi
Seismic profiling GI gun, 210 cu, 48 chan/300 m
Land surveying sea level change, ecology, boulder dating
Ice Shelf Drilling Oceanography
Seafloor mapping
Petermann 2015 components
Near shore mapping
Sediment coring Piston/gravity/multi
Seismic profiling GI gun, 210 cu, 48 chan/300 m
Land surveying sea level change, ecology, boulder dating
Ice Shelf Drilling Oceanography
Seafloor mapping
Ryder 2019 components
Near shore mapping
Unmanned mapping
Mapping systems
IB Oden Ship length: 109 m Multibeam: KM EM122, 1°x1°, 12 kHz (Depth range: 20-11000 m) Sub-bottom profiler: KM SBP120, 3°x3°, 2-7 kHz Midwater split beam: KM EK60, 18 kHz
RV Skidbladner Ship length: 6.4 m Multibeam: KM EM2040, 1°x1°, 200-400 kHz (Depth range: 0.5-550 m) Sub-bottom profiler: EA 600, 15 kHz
(KM=Kongsberg Maritime)
Remote controlled mapping
16/11/2018 / Name name, Institution or similar
Stockholm university coring system that. Here rigged in different modes
Rigged as piston corer, 9 m long Loaded with 1215 kg weights, total weight of corer ca 1600 kg.
Rigged as gravity corer, 6 m long Few hundred kilos loaded on core head
Rigged as gravity corer, smaller diameter, 6 m long. No weights loaded on core head
Sediment coring
1. Loss of ice tongue 2. Retreat to ∼800 m water depth 3. MICI
What controls stability? - Shape of seafloor - Warming ocean - Ice shelf buttressing - Iceberg calving - Geology
Ice Sheet System Model - state-of-the-art, high-
resolution ice dynamics, calving, ice-ocean, data assimilation, …
Models toothless w/o constraints from data What data? - Bathymetry (Oden) - Geophysics (Oden) - Sediment cores (Oden) - Oceanography (Oden) - Ice flow (remote sensing) - Atmosphere (model)
Modelling N. Greenland: Petermann Glacier and beyond Areas below sea level reach far inland
Mor
lighe
m e
t al.
2018
N. Greenland bed topography Petermann ice flow
Ice shelf collapse under (past or future) warming?
TODAY ---------> FUTURE?
Åkesson, Jakobsson, Morlighem, in prep.
Acoustic oceanography: Spatial mapping oceanic features far beyond CTD casts
Exploring the
unknown marine
termination of
Northern
Greenland’s second
largest outlet
glacier
Thule-Thule
Start mid August
End mid-end of
September
Modelled fjord bathymetry based on shorelines and continuation from under ice topography. No existing multibeam bathymetry.
BedMachine v3 bathymetry including IB Oden Petermann 2015 survey: Morlighem, M., incl. Hogan, K., Jakobsson, M., Mayer, L., Zinglersen, K. B., 2017, BedMachine v3: Geophysical Research Letters, v. 44 (21), 11,051-011,061.
Bathymetric sills?
Grounding Zone?
Open data and new bathymetric models!
How is Seabed 2030 organized?
RDACC North Pacific-Arctic Ocean: Stockholm University (SU)/University of New Hampshire (UNH)
RDACC Southern Ocean: Alfred Wegener Institute of Polar and Marine Research (AWI)
RDACC South and West Pacific Ocean: The National Institute of Water and Atmospheric Research (NIWA)
GDACC: National Oceanography Centre (NOC)/British Ocanographic Data Centre (BODC)
CU
NOC/BODC UNH
RDACC Atlantic and Indian oceans: Columbia University (CU)
Bildnummer 1Bildnummer 2Bildnummer 3Bildnummer 4Bildnummer 5Bildnummer 6Ryder 2019 Expedition�Scientific purpose and aimsBildnummer 8Bildnummer 9Bildnummer 10Mapping systems�Bildnummer 12Bildnummer 13Bildnummer 14Bildnummer 15Bildnummer 16Bildnummer 17Bildnummer 18Bildnummer 19