Snowball Earth Roopa Kamesh Matt Beversdorf Kathy Groome

Slides:

Advertisements

Similar presentations

Snowball Earth.

Advertisements

CO2 and Long Term Climate GEOL 1130 Spring Earth-Venus contrast Which planet receives more incoming solar radiation? Which planet absorbs more solar.

Outline of this short course on climate change: 1. Introduction 2. Just three things determine the Earth’s temperature: The sun along with the albedo.

1.Greenhouse Effect 2.The CO 2 Cycle, Long-Term Climate Change 3.Ice Ages and Short-Term Climate Change 4.Human-Induced Climate Change.

Reading: Chapter 4 Lecture 25. Snowball Earth vs. Slushball Earth..

The Early history of Earth! After the Earth formed…about 4.6 Billion years ago… …The Earth melted and differentiated into Core, Mantle, and Crust.

Sea-Tac. Glacial evidence In what way is a glacier like a water reservoir (other than they are both water)?

Lecture 17 Tectonic-scale Climate Change Text book: Ch. 4, p64-67, 71-80, Four Main Processes: –Land-ocean spatial configuration: control where.

Proterozoic Making the Modern World Myrs 2500 Myr 1600 Myr 1000 Myr.

Snowball Earth Presented by Mindi Purdy and Jen Ulrich.

Greenhouse Effect. Thermal radiation Objects emit electromagnetic radiation –The hotter they are, the faster the energy output (  T 4 ) –The hotter they.

Paleoproterozoic Snowball Earth: Earth is glaciated to the equator 2

Snowbal l Earth Roopa Kamesh Matt Beversdorf Kathy Groome.

EARLY PALEOZOIC EVENTS

The Snowball Earth Hypothesis: Where It Came From, Where It’s Going Linda Sohl Center for Climate Systems Research, Columbia University.

Astronomy190 - Topics in Astronomy Astronomy and Astrobiology Lecture 10 : Earth History Ty Robinson.

The importance of Antarctic blue ice for understanding the tropical ocean of Snowball Earth Stephen Warren University of Washington Seattle, USA.

CLIMATE CHANGE Global Temperatures: Past, Present, and Future.

Snowball Earth Presented by Mindi Purdy and Jen Ulrich.

PTYS 214 – Spring2011  Homework #5 DUE in class TODAY  Homework #6 available for download on the website DUE on Tuesday, March 1 (yes, next class!) 

Unit 11 Notes: Climate Change

CLIMATE CHANGE THE GREAT DEBATE Session 2. EARTH HISTORY 4567 Ma to 2.5 Ma No rocks are left that date back to the beginning of the Earth. Oldest known.

Goals for this section 1.EXPLAIN the feedback mechanism believed to have maintained Earth's average temperature within the range of liquid water over 100s.

Continental Drift: The Beginning of Plate Tectonics

Chapter 4 Sections 3 and 4 Long Term Changes in Climate Global Changes in the Atmosphere.

Long-Term Climate Cycles &the Proterozoic Glaciations(Snowball Earth) Assigned Reading: Stanley, pp , Hoffman & Schrag (2002) Terra Nova,

 The difference between weather and climate is a measure of time. Weather is what conditions of the atmosphere are over a short period of time, and climate.

To get to journals electronically: -click on letter corresponding to journal name Or

Geologic History and the Evolution of Life

What is an Ice Age ? Ice ages are times when large areas of the earths surface are covered with ice sheets The term is used to describe time periods when.

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

Snowball Earth Hoffman et al. Science Evidence.

Chapter 14: Climate change The earth’s changing climate The earth’s changing climate Possible causes of climatic change Possible causes of climatic change.

Climate change – “science catfight” or not?. The Record Of Climate Change Proxy Data.

Greenhouse Effect Mechanisms Affecting the Greenhouse Evidence for Climate Change.

17.3 Ice Age. What is an Ice Age? Thousands of years ago ice sheets covered much more of the Earth’s surface. Thousands of years ago ice sheets covered.

DAISY WORLD, LIGHT/DARK DASIES EFFECT OF DASIES ON GLOBAL CLIMATE.

Lecture Outlines Physical Geology, 14/e Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Plummer, Carlson &

Evolution of the Earth David Spergel. Evolution of Earth’s Atmosphere  Earth lost its early atmosphere in major collisions (first Myr)  Subsequent.

THE GREENHOUSE EFFECT Greenhouse Gases:  chemical compounds in the atmosphere that trap heat  they retain a proportion of the sun’s heat through the.

Chapter 14 The Changing Climate The Atmosphere 10e Lutgens & Tarbuck Power Point by Michael C. LoPresto.

Late Proterozoic Snowball Earth Brian Morgan Colby College December 3, 2012.

Ice Age – Period of millions of years where continents were repeatedly glaciated.

Glacial Landscapes.

Ice Ages Pleistocene 3 M.y. Permian M.y. Ordovician 450 M.y. Precambrian – M.y. (Snowball Earth) –2300 M.y.

Snowball Earth History of Glaciation. Main Periods of Glaciation Huronian glaciations billion years ago Late Proterozoic glaciations million.

Habitability: Making a habitable planet 26 January 2016.

Climate Change. Causes Several factors affect global climate: 1.Changes in solar output 2.Changes in Earth's orbit 3.Changes in the distribution of continents.

Climate L2 Greenhouse gases current interglacial Last glacial.

Long-Term Climate Cycles & The Proterozoic Glaciations (‘Snowball Earth’) Assigned Reading: Hoffman & Schrag (2002) Terra Nova, Vol. 14(3): Lubick.

Unit 3 Notes Part 5: Climate Change. What are natural causes that could result in global climate change? Plate tectonics – when the continents move they.

INTRO TO CLIMATE CHANGE Objective: I will differentiate between global warming and climate change. I will discuss the causes of natural and human influenced.

To recap Give 2 examples of research methods that show long term historical climate change? How reliable are these? Give 2 ways of measuring medium term.

Week 7 Cretaceous and Snowball Earth

A snowball Earth versus a slushball Earth: Results from Neoproterozoic climate modeling sensitivity experiments Micheels and Montenari (2008) By: Madeline.

Snowball Earth vs. Slushball Earth..

What Causes Ice Ages?

Continental Drift: The Beginning of Plate Tectonics

Climate Change Carbon Cycle.

Starter How do you think the things in the photographs lead to changes in the climate?

Climate Change.

Ice Ages Pleistocene 3 M.y. Permian M.y. Ordovician 450 M.y.

THE GREENHOUSE EFFECT Greenhouse Gases:

Overview of “Snowball Earth”

Snowball Earth! Hot House Earth!

Chemistry of the atmosphere

ASTR/GEOL-2040: Search for life in the Universe: Lecture 14

The Earth’s Atmosphere

Starter How do you think the things in the photographs lead to changes in the climate?

Presentation transcript:

Snowball Earth Roopa Kamesh Matt Beversdorf Kathy Groome

Theory of Snowball Earth Continents and oceans were covered in ice approximately 600 million years ago. Earth was in a deep freeze, chemical cycles were halted; carbon dioxide accumulated in the atmosphere causing an extreme greenhouse effect. Believed to have caused the explosion of life forms seen in Cambrian fossils

Snowball Earth occurred during the Neoproterozoic

Existing Evidence Paleomagnetic Studies Banded Iron Formations Glacial Deposits and Carbonate Caps Paleomagnetic Studies Banded Iron Formations Manganese Deposits Isotope Analysis Plate Tectonics, Carbon Dioxide Emissions Ice Albedo Feedback Proterozoic Biostratigraphy: Persistence and the Explosion of Life Extremophiles

Glacial Deposits and Carbonate Caps

Paleomagnetic Studies From Understanding Earth, Press and Seiver, W.H. Freeman and Co.

Banded Iron Formations

Carbon isotopes (Stanley, Steven, M., 1999) Isotope Analysis Carbon isotopes (Stanley, Steven, M., 1999)

Isotope Examples Source: A.H. Knoll. 2000. Learning to tell Neoproterozoic Time

Albedo Effect Once the continents were glaciated to 30 degrees latitude, there was a runaway albedo effect. Albedo refers to the reflective ability of a material. You can see the difference in how each material reflects sunlight in the table above.

Extremophiles Extremophiles provide evidence that life could have persisted under snowball Earth conditions.

Problems with the Snowball Earth Theory

The Explosion of Life: Just a Coincidence?

Arguments Against Organisms need sunlight and/or oxygen to survive (e.g. algae) Freeze thaw structures – no glacial deposits on a completely frozen planet Sea-level change – evidence for lowering of sea level Inconsistency of isotope results: Kennedy Carbon dioxide emissions - what about methane?

Alternative Theories Earth’s Obliquity: Increased Axial Tilt Slushball Earth: A variation of snowball earth where the planet did not entirely freeze. This theory is based more on climate models for the Neoproterozoic.

What do you think???