Presentation is loading. Please wait.

Presentation is loading. Please wait.

Camille Li, Kerim Nisancioglu, Trond Dokken, Øyvind Lie Bjerknes Centre for Climate Research David Battisti University of Washington Lev Tarasov Memorial.

Published byPenelope Gwendoline Mosley Modified over 7 years ago

Similar presentations

Presentation on theme: "Camille Li, Kerim Nisancioglu, Trond Dokken, Øyvind Lie Bjerknes Centre for Climate Research David Battisti University of Washington Lev Tarasov Memorial."— Presentation transcript:

1 Camille Li, Kerim Nisancioglu, Trond Dokken, Øyvind Lie Bjerknes Centre for Climate Research David Battisti University of Washington Lev Tarasov Memorial University OUTLINE 1. Background: D-O events 2. A conceptual model 3. Clues from climate models A conceptual model for D-O events

2 x Dansgaard-Oeschger events ice  18 O (per mil) ky before present oxygen isotope record from ice core warm cold

3 ice  18 O (per mil) ky before present oxygen isotope record from ice core warm cold Dansgaard-Oeschger events x -abrupt warming events in Greenland -large amplitude in Greenland (7-12C) -climate signal throughout the Northern Hemisphere -millennial scale timing -leading hypothesis: ocean thermohaline circulation

4 What can we learn from models? AOGCM atmosphere-ocean general circulation model

5 What can we learn from models? EMIC earth model of intermediate complexity

6 NADW (Sv) FW (Sv) Greenland T (C) What can we learn from models? Knutti et al. 2004 Nature EMIC earth model of intermediate complexity e.g. ECBILT-CLIO

7 EMIC + ice sheet model + AGCM (atmosphere & land) What can we learn from models?

8 Building a conceptual model TM Dokken

9 Building a conceptual model TM Dokken

10 Clues from climate models ocean

11 Clues from climate models subsurface ocean warming (EMIC) KH Nisancioglu -3 km -2 km -1 km -4 km 40S20S020N40N60N80N60S80S latitude Atlantic Ocean temperature change after freshening of Nordic Seas (C)

12 Clues from climate models atmosphere

13 Clues from climate models sea ice & Greenland temperature (AGCM) Li & al. 2005 GRL

14 Clues from climate models contours: zonal wind 200mb (10m/s) colours: transient heat flux 850mb (Km/s) warm “interstadial” state: weak jet, stronger storms cold “stadial” state: strong jet, weaker storms jets & storminess (AOGCM/AGCM)

15 Summary

16 artwork courtesy of D. Battisti see also: Seager & Battisti 2006 A final picture cold “interstadial” state strong, steady jet warm “stadial” state weak, wobbly jet

17 ice  18 O (per mil) ky before present oxygen isotope record from ice core warm cold x Dansgaard-Oeschger events Rahmstorf 2003

Download ppt "Camille Li, Kerim Nisancioglu, Trond Dokken, Øyvind Lie Bjerknes Centre for Climate Research David Battisti University of Washington Lev Tarasov Memorial."

Similar presentations

Meteorologisk Institutt met.no Ocean Surface Warming by Polar lows - Observational Evidence from Microwave Data Øyvind Saetra, Torsten Linders and Steinar.

Meteorologisk Institutt met.no Ocean Surface Warming by Polar lows - Observational Evidence from Microwave Data Øyvind Saetra, Torsten Linders and Steinar.
An event-based approach to understanding decadal variability in the Atlantic Meridional Overturning Circulation Lesley Allison, Ed Hawkins & Tim Woollings.

An event-based approach to understanding decadal variability in the Atlantic Meridional Overturning Circulation Lesley Allison, Ed Hawkins & Tim Woollings.
Sensitivity of the Western Mediterranean Sea to Holocene climate variability Isabel Cacho 1, Gemma Herrera 1, Jaume Frigola 1, Miquel Canals 1 & Ana Moreno.

Sensitivity of the Western Mediterranean Sea to Holocene climate variability Isabel Cacho 1, Gemma Herrera 1, Jaume Frigola 1, Miquel Canals 1 & Ana Moreno.
Modeling the MOC Ronald J Stouffer Geophysical Fluid Dynamics Laboratory NOAA The views described here are solely those of the presenter and not of GFDL/NOAA/DOC.

Modeling the MOC Ronald J Stouffer Geophysical Fluid Dynamics Laboratory NOAA The views described here are solely those of the presenter and not of GFDL/NOAA/DOC.
GEOS 112 Lecture Topics 4/28/03 Read Chapter 12 (Glaciers) Final Exam – Monday, May 5 1:00pm 1.Types of Glaciers; 2.Glacier Formation, Mass Balance, and.

GEOS 112 Lecture Topics 4/28/03 Read Chapter 12 (Glaciers) Final Exam – Monday, May 5 1:00pm 1.Types of Glaciers; 2.Glacier Formation, Mass Balance, and.
Climate Variability on Millennial Time Scales Introduction Dansgaard-Oeschger events Heinrich events Younger Dryas event Deglacial meltwater Meridional.

Climate Variability on Millennial Time Scales Introduction Dansgaard-Oeschger events Heinrich events Younger Dryas event Deglacial meltwater Meridional.
Deglaciation Timing of Millennial-Scale Climate Change in Antarctica and Greenland During the Last Glacial Period Thomas Blunier and Edward Brook, 2001.

Deglaciation Timing of Millennial-Scale Climate Change in Antarctica and Greenland During the Last Glacial Period Thomas Blunier and Edward Brook, 2001.
Abrupt Climate Change Evidence of climate changes that are too abrupt to be explained orbitally.

Abrupt Climate Change Evidence of climate changes that are too abrupt to be explained orbitally.
On the Origin of Antarctic Warming Events: A Modeling Study of Causes and Effects Oliver Timm, Laurie Menviel, Axel Timmermann International Pacific Research.

On the Origin of Antarctic Warming Events: A Modeling Study of Causes and Effects Oliver Timm, Laurie Menviel, Axel Timmermann International Pacific Research.
Slide 1 Predicting the Climate of Europe: the THOR project Laurent Mortier – University of Paris for Detlef Quadfasel (co-ordinator), University of Hamburg.

Slide 1 Predicting the Climate of Europe: the THOR project Laurent Mortier – University of Paris for Detlef Quadfasel (co-ordinator), University of Hamburg.
Don’t Discount the Tropics “Challenges to our understanding of the general circulation: abrupt climate change” R. Seager and D.S. Battisti 2007 Laura Zaunbrecher.

Don’t Discount the Tropics “Challenges to our understanding of the general circulation: abrupt climate change” R. Seager and D.S. Battisti 2007 Laura Zaunbrecher.
Outline for our third lecture 1)Motivation: To evaluate proxy-reconstructed changes within a dynamical framework; to advance our understanding of climate.

Outline for our third lecture 1)Motivation: To evaluate proxy-reconstructed changes within a dynamical framework; to advance our understanding of climate.
Causes of Reduced North Atlantic Storm Activity in A Global Climate Model Simulation of the Last Glacial Maximum Aaron Donohoe, David Battisti, Camille.

Causes of Reduced North Atlantic Storm Activity in A Global Climate Model Simulation of the Last Glacial Maximum Aaron Donohoe, David Battisti, Camille.
Determining Past Climates Sediment cores Ice cores Oxygen isotope ratios Dendrochronology (tree rings )

Determining Past Climates Sediment cores Ice cores Oxygen isotope ratios Dendrochronology (tree rings )
Why do we have storms in atmosphere?. Mid-atmosphere (500 hPa) DJF temperature map What are the features of the mean state on which storms grow?

Why do we have storms in atmosphere?. Mid-atmosphere (500 hPa) DJF temperature map What are the features of the mean state on which storms grow?
David S. Battisti University of Washington What controls the location of the sea ice edge in the N. Atlantic? Why do we care? 1.Motivation 2.Impact of.

David S. Battisti University of Washington What controls the location of the sea ice edge in the N. Atlantic? Why do we care? 1.Motivation 2.Impact of.
Stratigraphy of climate change Lecture 19. The predominant power in this spectrum is at about 100,000, 41,000 and 19- 23,000 years.

Stratigraphy of climate change Lecture 19. The predominant power in this spectrum is at about 100,000, 41,000 and ,000 years.
Motivation To understand how climate change may affect the North Atlantic and European regions, an understanding of the North Atlantic storm track is required.

Motivation To understand how climate change may affect the North Atlantic and European regions, an understanding of the North Atlantic storm track is required.
Thermohaline Circulation (THC) By Ross Alter. What is it? “…that part of the ocean circulation which is driven by fluxes of heat and freshwater across.

Thermohaline Circulation (THC) By Ross Alter. What is it? “…that part of the ocean circulation which is driven by fluxes of heat and freshwater across.
Abrupt changes in atmospheric circulation from Greenland Ice Cores.

Abrupt changes in atmospheric circulation from Greenland Ice Cores.

Similar presentations

Ads by Google