Bestand wählen
Merken

Coupled Ice Sheet - Climate simulation

Zitierlink des Filmsegments
Embed Code

Für dieses Video liegen keine automatischen Analyseergebnisse vor.

Analyseergebnisse werden nur für Videos aus Technik, Architektur, Chemie, Informatik, Mathematik und Physik erstellt, bei denen dies rechtlich zulässig ist.

Metadaten

Formale Metadaten

Titel Coupled Ice Sheet - Climate simulation
Autor Ziemen, Florian Andreas
Lizenz CC-Namensnennung 3.0 Deutschland:
Sie dürfen das Werk bzw. den Inhalt zu jedem legalen Zweck nutzen, verändern und in unveränderter oder veränderter Form vervielfältigen, verbreiten und öffentlich zugänglich machen, sofern Sie den Namen des Autors/Rechteinhabers in der von ihm festgelegten Weise nennen.
DOI 10.5446/35259
Herausgeber Copernicus Publications
Erscheinungsjahr 2018
Sprache Stummfilm

Inhaltliche Metadaten

Fachgebiet Geowissenschaften / Geographie
Abstract Supplement to paper Heinrich events show two-stage climate response in transient glacial simulations in submission to Climate of the past Abstract: Heinrich events are among the dominant modes of glacial climate variability. During these events, massive iceberg armadas were released by the Laurentide Ice Sheet, sailed across the Atlantic, and caused large-scale climate changes. We study these events in a fully coupled complex ice sheet–climate model with synchronous coupling between ice sheets and oceans. The ice discharges occur as internal variability of the model with a recurrence period of 5 kyr, an event duration of 1–1.5 kyr, and a peak discharge rate of about 50 mSv, roughly consistent with reconstructions. The climate response shows a two-stage behavior, with freshwater release effects dominating the surge phase and ice-sheet elevation effects dominating in the post-surge phase. As a direct response to the freshwater discharge during the surge phase, the deepwater formation in the North Atlantic decreases and the North Atlantic deepwater cell weakens by 3.5 Sv. With the reduced oceanic heat transport, the surface temperatures across the North Atlantic decrease, and the associated reduction in evaporation causes a drying in Europe. The ice discharge lowers the surface elevation in the Hudson Bay area and thus leads to increased precipitation and accelerated ice sheet regrowth in the post-surge phase. Furthermore, the jet stream widens to the north and becomes more zonal. This contributes to a weakening of the subpolar gyre, and a continued cooling over Europe even after the ice discharge. This two-stage behavior can explain previously contradicting model results and understandings of Heinrich Events.
Schlagwörter ice sheets
climate
glacial
heinrich events
simulation
modeling

Zugehöriges Material

Ähnliche Filme

Loading...
Feedback