ice2ice

PI meeting (dinner the 8th)

Monthly meeting in Bergen.

Contact: Jørund

Francesco Muschitiello

(Lamont-Doherty Earth Observatory of Columbia University)

Title: “Deep-water circulation leads North Atlantic climate during the last deglaciation”.

Abstract: Constraining the response time of the climate system to changes in Atlantic Meridional Overturning Circulation (AMOC) is fundamental to improve climate predictability. Here we present a precise synchronization of terrestrial, marine and ice-core records that reveals for the first time the ocean-atmosphere lead-lag nature during rapid North Atlantic climate transitions of the last deglaciation. Using a continuous record of deep water ventilation from the Nordic Seas, we identify a systematic ~250-year lead of deep-water export on abrupt climate changes recorded in Greenland ice cores –in and out of the Younger Dyas stadial (YD)– in response to gradual changes in freshwater forcing. Supported by transient climate model simulations, our results also point at a delayed response of atmospheric CO₂ rise to AMOC slowdown at the onset of the YD. We conclude that variations in North Atlantic deep-water formation are precursors to large-scale climate and pCO₂ changes, which highlights the need for improved long-term future AMOC projections.

DMI/NBI meeting at CIC

AGENDA:

-Information on ice2ice all staff (helle)-10 min

-update from SMB workshop (Ruth and Andreas)-20 min

-update on TAC work in Bremerhaven (Bo and Sindhu)-20 min

-Peter: “Inflated uncertainty in multi-model based regional climate projections” (paper accepteret I GRL)- 20 min

-Jens: “Confidence in regional climate projections?”- 20 min

-Publications – if you have new publications please prepare a slide (all)

-Misc

Contact Helle if you have more items for the agenda

Mari defense @Bergen

Get the abstract as a pdf here.

PI meeting in Bergen

Ph.d.-kandidat Henning Martin Åkesson vil holde følgende prøveforelesning over oppgitt emne for ph.d.-graden:

Tittel: «Past, present and future sea-level changes in the context of regional and global ice dynamics»

Tid:        5. desember, kl. 14.15

Sted:     Auditorium 2, underetasjen, Realfagbygget, Allégaten 41

Komité:

Professor Ulysses Ninnemann, GEO

Professor Haflidi Haflidasson, GEO

Forsker, Dr. Andreas Born, GEO

Adgang for interesserte tilhørere.

VELKOMMEN!

Talk by Henrik Sadatzki @CIC- RF 235

Northern sea ice variability during Dansgaard-Oeschger climate cycles

Changes in sea ice cover in the Nordic Seas likely played a crucial role in amplifying ocean circulation and climate changes of the Dansgaard-Oeschger (D-O) cycles during the last glacial. We investigate the role of sea ice for abrupt Greenland climate changes, using a high-resolution sea ice record from Norwegian Sea core MD99-2284 covering four D-O cycles at 32–40 ka. The sea ice reconstruction is based on abundances of the sea ice diatom biomarker IP₂₅ and the open-water phytoplankton biomarker dinosterol, as well as on semi-quantitative phytoplankton-IP₂₅ (PIP₂₅) sea ice estimates. Our biomarker records indicate that the Norwegian Sea was characterized by a near-perennial sea ice cover during cold stadials and enhanced open-ocean conditions during warmer interstadials. Moreover, we find that initiation of sea ice retreat systematically preceded the onset of major deep-water formation in the Nordic Seas and probably the abrupt D-O warming in Greenland. We thus conclude that the glacial sea ice variability acted as precursor and feedback mechanism for abrupt ocean circulation and Greenland climate change during D-O cycles.

Ice2ice Bergen group meeting

Please sign up here (before lunch, Tuesday 12.12.)

Date and Time; 14.12, 09-11.

(Team Jansen meeting back-to-back, 11-12.)

Agenda
* Info from PI meeting @Bergen and info Ice2ice all-staff 2018
* Talk by Philipp Anhaus (student of Lars Henrik), presenting his Master “Circulation and Ocean Driven Glacial Melting in a Greenland Fjord”
*AOB

Venue: East wing, room 209.

KUNNGJØRING – MIDTVEISPRESENTASJON

Ph.d.-kandidat Lisa Griem vil avholde midtveispresentasjon av sitt ph.d.- prosjekt.

Tittel: “Ocean circulation changes off southern Greenland during the abrupt climate events of mid-to-late MIS 3”

Veiledningskomité:

Professor Eystein Jansen – GEO (hovedveileder)

Dr. Trond Martin Dokken –  Uni Research Climate

Forsker Sarah Miche Patricia Berben – GEO

Midtveispresentasjon

Tid: Mandag 8. januar, klokken 09.15

Sted: Ph.d.-rommet, Realfagbygget

Komité for midtveisevaluering:

Professor Atle Nesje – GEO (leder)

Professor Ulysses Ninnemann – GEO

Førsteamanuensis Gunnar Sælen – GEO

ice2ice DMI/NBI meeting @DMI

Agenda:

-all staff

-Eliza new tephra papers

-Ida

-Martin O

If you have items for the agenda, please let Helle know.

Henning’s PhD defense @Bergen

Title of the Thesis 

” Deglaciation of the Norwegian fjords”

 Opponent:

Professor, Andreas Vieli, University of Zurich, Sveits,

Opponent:

Professor, Chris Stokes, Durham University, Storbritannia

Øvrig medlem i komiteen:

Professor, dr. scient. Atle Nesje, Institutt for geovitenskap, Universitetet i Bergen

Leder av disputasen:

Førsteamanuensis Cédric Hamelin, Universitetet i Bergen