Abrupt Climate Change in the Glacial-Interglacial Record AOS 528, 11/27/07.

Slides:

Advertisements

Similar presentations

It all begins with the sun……

Advertisements

Global Air temperature from 1850 The time series shows the combined global land and marine surface temperature record from 1850 to The year 2007.

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.

1 Last Glacial Maximum (~20K yrs ago) and afterwards What was climate like during LGM? What happened to end LGM? How has climate varied since LGM? What.

11/3 papers review.

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.

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.

Climatology Climatology is the study of Earth’s climate and the factors that affect past, present, and future climatic changes. Climate describes the long-term.

Global warming and the oceans. Warming of ocean is three dimensional process.

FIGURE 13-1 Mammals of the glacial maximum, years ago Chapter 13 The Last Glacial Maximum.

Millennial-Scale Oscillations Many are rapid enough to affect human life spans Many are rapid enough to affect human life spans Largest and best defined.

Carbon System Controls on CO 2 Increase biologic carbon pump in coastal and tropical ocean Increase carbon pump in Antarctic Change chemistry of Antarctic.

Global Climate Cycles, Global Warming and Anthropogenic Greenhouse Effect.

Stratigraphy of climate change Lecture 19. The predominant power in this spectrum is at about 100,000, 41,000 and ,000 years.

Abrupt changes in atmospheric circulation from Greenland Ice Cores.

The Current Interglacial (Holocene) AOS 528, 11/29/07.

Lecture 13 Orbital-Scale Interactions, Feedbacks and Unresolved Problems The Cause of Glacial Cycles? (Chapter 11)

Glacial-Interglacial Variability Records of the Pleistocene Ice Ages

Protecting our Health from Climate Change: a Training Course for Public Health Professionals Chapter 2: Weather, Climate, Climate Variability, and Climate.

5. Future climate predictions Global average temperature and sea-level are projected to rise under all IPCC scenarios Temperature: +1.8°C (B1) to +4.0°C.

Paleoclimatology Why is it important? Angela Colbert Climate Modeling Group October 24, 2011.

European capacity building initiativeecbi Climate Change: an Introduction ecbi Workshops 2007 Claire N Parker Environmental Policy Consultant european.

Reviewing Climate Change Over Time Forcing Factors and Relevant Measurements.

Samayaluca Dune Field, south of Juarez, Chihuahua Global Climate Change.

The Climate System Lecture 1 Ecological Climatology.

Characterizing and understanding the Quaternary Glacial/Interglacial cycles Earth’s Climate and Environment: Past, Present, and Future GEOL 3100.

Unit VII. Global Warming Is the planet warming? How do we know? How confident are we? If it is warming, how long has it been warming? How unusual is the.

A bipolar perspective on past climate change (and expectations for information from the Third Pole) Valérie Masson-Delmotte Laboratoire des Sciences du.

Modern Climate Change Darryn Waugh OES Summer Course, July 2015.

Projecting changes in climate and sea level Thomas Stocker Climate and Environmental Physics, Physics Institute, University of Bern Jonathan Gregory Walker.

Are We Getting Warmer?. How do you take a planets temperature?  If you have them, then thermometers spread around the earth can tell us the average temperature.

The Last Glacial Maximum. What was it like during the last glacial max? About 21K yrs ago ice sheets were at a max and CO2 was at a min. The ice.

Lecture 27: Climate Change in the Last Years Ch. 13.

Chapter 11 Orbital-Scale Changes in Carbon Dioxide and Methane Reporter : Yu-Ching Chen Date : May 22, 2003 (Thursday)

CLIMATE CHANGE THE GREAT DEBATE Session 5.

Carbon and Climate System Coupling on Timescales from the Precambrian to the Anthropocene Scott C. Doney1 and David S. Schimel2.

Lecture 29: Millennial Changes in Other Regions

CO 2 and Climate Change. Lisiecki & Raymo,

Orbital Forcing on Climate Finish Climates of Geologic Time Introduction to Orbital Factors Axial Tilt Axial Precession Changes in Earth’s eccentric orbit.

1 2009/12/17 闕珮羽. 2 Introduction This paper shows that the internal mechanism has an intrinsic timescale of 100,000 years The 100,000-year cycles and.

Climate Change: an Introduction ecbi Workshops 2007 Claire N Parker Environmental Policy Consultant european capacity building initiative initiative européenne.

Willie Soon. Introduction 1. The relationship between atmospheric CO2 and CH4 concentrations, temperature, and ice-sheet volume 2. Atmospheric CO2 radiative.

For the last 60 My, the climate has been ‘cooling down’, and becoming more and more variable over short time scales. (note log time scale).

The Younger Dryas and Rapid Climate Change Bruno Tremblay McGill University

What have we covered so far – the Basic Questions 1. Climate has not always been similar to the present; in fact has rarely been like the present Holocene.

James Hansen, Goddard Institute for Space Studies, NASA Long-term feedback systems more powerful than thought previously Amplification – albedo, methane,

WHAT IS IT AND WHAT ARE SCIENTISTS DOING TO GATHER INFORMATION ABOUT IT? Climate Change.

 On a climograph, what data are represented with bars? ◦ What data are represented with a line graph?  How can you determine the climate classification.

Global Warming Environmental Science January 4, 2011.

Climate Change – is it really happening? Kathy Maskell Walker Institute for Climate System Research, University of Reading.

Aim: study the first order local forcing mechanisms Focusing on 50°-90°S (regional features will average out)

Our water planet and our water hemisphere

Abrupt changes in atmospheric circulation from Greenland Ice Cores

Climates of Geologic Time

Effects of the Doubling of Carbon Dioxide

Natural Causes of Climate Change

Lecture 28: Millennial Changes: δ18O in Ice Sheets

Deglacial Climate Change

Climate Changes due to Natural Processes

Deglacial Climate Change

Earth’s climate through time

Lecture 21: Ice Core Records

Climate Changes due to Natural Processes

Chapter 6 Climate.

Climate Change on Millennial Time Scale During the Last

Evidence for the Jumping Jet Hypothesis of abrupt climate Change

Presentation transcript:

Abrupt Climate Change in the Glacial-Interglacial Record AOS 528, 11/27/07

Large changes within less than a 30 year period  Abrupt on human time scales (climatology), but… A transition or response that is rapid compared to the forcing.  Relevant for any time scale  Incorporates the idea of thresholds, but… Definitions of Abrupt What’s the forcing and what’s a feedback? What is the definition of “large changes”?

CO 2 CH 4 N2ON2O Definitions of Abrupt What is rapid?

Sea Level Rise Sea Level Rise Holocene and Projected Sea Level Rise 8,000 BP to 2100 Holocene and Projected Sea Level Rise 8,000 BP to 2100 Future rate similar to deglacial sea level rise. ~1m per century Future rate similar to deglacial sea level rise. ~1m per century

Glacial-Interglacial Abrupt Events Abrupt events during glacials were larger and more widespread than during the most recent interglacial (Holocene) Both cooling and warming events are identified (but none are warmer than modern climate) Wide varieties of proxy data record these abrupt events

Temperature Dust / Iron CO 2 Antarctica Proxy Data and Abrupt Climate Events Temperature CH 4 MOC Temperature Meridional Overturning Circulation Greenland nss-Ca 2+ = non-sea salt Calcium

Proxy Data Findings 1.Abrupt warming and cooling events are recorded in both Greenland and Antarctica 2.Large methane signal (∆CH 4 =150ppb) possibly related to changes in tropical wetlands or Asian monsoon low CH 4 correlated with increased dust in Antarctica (cold, dry and windy?) 3.Small carbon dioxide signal (∆CO 2 =20ppm) 4.Pollen records show equatorward shift of boreal tree lines (cold weather forests) during cooling events 5.Effects are global, but out-of-phase in N. and S. Hemispheres (i.e. Northern and Southern Hemisphere signals are not synchronous)

Methane vs Carbon Dioxide 1.Large methane signal (∆CH 4 =150ppb) possibly related to changes in tropical wetlands or Asian monsoon low CH 4 correlated with increased dust in Antarctica (cold, dry and windy?) 2.Small carbon dioxide signal (∆CO 2 =20ppm)

Abrupt Climate Change and Atlantic Ocean Circulation Abrupt Cooling: Heinrich Events Decreased NADW NADW formation south of modern location Abrupt Warming: Dansgaard-Oeschger Events Increased NADW NADW formation north of modern location Modern Atlantic Ocean Circulation Heinrich Dansgaard/ Oeschger

Presentation Instructions 1.Submit presentations to me via attachment by at least 11PM the night before your presentation. 2.Powerpoint presentations a)10 minutes + 5 minutes for questions 4 to 8 slides, including a title slide and a final slide summarizing conclusions b)Each person in the group must present some of the material c)Use plenty of images, and make sure fonts are large enough to read in the back of the room d)Speak so people can hear you in the back also e)Talk slowly and precisely, and PRACTICE! 3.Remember that there will be two dates for the Final Powerpoint Presentations: December 6th (during class) and December 20th (during the final exam from 10:05-12:05) 4.Everyone is expected to show up for all group presentations! I will have a sign-in sheet available those days.

Powerpoint Presentations: December 6th Presentations:Thursday, December 6th (during class) Term papers:Thursday, December 13th (midnight) Group 2: Phillips, Schiferl The Effectiveness of the Kyoto Protocol Group 7: Schmidt, Bruskewitz, Serwe: Title? Group 8: Schuh, Moore, Olson Effects of Global Warming on Agriculture Production in the Midwest Group 9: Kirchner, Shewczyk, Welhouse Global Climate Change's Effects On Agriculture Group 10: Franklin, Obbink, Orland The Effects of Orbital Forcings During Mid-Pliocene Global Warming

Powerpoint Presentations: December 20th Presentations:Thursday, December 20th (10:05am) Term papers:Saturday, December 8th (midnight) Group 1: Lubcaynka, Moua, Propheter US and China's Affect on Global Warming Group 3: Caruso, Maloney, Schmelzer Title? Group 4: Schreiber, Brown "Peak Oil" Predictions and Their Effect on Future Warming Group 5: Asuma, Caves, Koch A Comparison of Global Climate Effects Due to Varying Rates of Methane Introduction Group 6: Marsicek, Ronnei, McCarville Using Drought Index to Analyze Potential Impacts on the Tropical Rainforest By Increasing CO2 and Solar Luminosity Group 11: Hladish, Kampa A Potential Glacial Maximum in the Future?