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Climate Change: What Do the Data Suggest?. Deborah Hughes Hallett Department of Mathematics, University of Arizona Harvard Kennedy School. Minneapolis Metrodome on December 12, 2010, after a 17 inch snowfall (luckily at 5 am). In 2009.

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Climate change what do the data suggest

Climate Change: What Do the Data Suggest?

Deborah Hughes Hallett

Department of Mathematics, University of Arizona

Harvard Kennedy School


Minneapolis metrodome on december 12 2010 after a 17 inch snowfall luckily at 5 am
Minneapolis Metrodome on December 12, 2010, after a 17 inch snowfall (luckily at 5 am)

In 2009

http://sports.yahoo.com/nfl/blog/shutdown_corner/post/Amazing-before-and-after-pictures-of-the-Metrodo?urn=nfl-295249 and

http://www.eurweb.com/wp-content/uploads/2010/12/metrodome_roof_collapse2010-med-wide.jpg


At least 350 000 people stranded in europe
At least 350,000 people stranded in Europe

London Dec 21, 2010

http://www.thedailybeast.com/blogs-and-stories/2010-12-21/heathrow-airport-shutdown-whats-the-real-cause/

http://www.spiegel.de/fotostrecke/fotostrecke-62886-12.html


Europe s airports december 2010
Europe’s airports, December 2010

Helsinki, Finland

“The last time [the airport] was forced to close because of the weather was in 2003. That closure lasted for half an hour.” Dec 20, BBC

London, UK, Dec 17

Frankfurt, Germany, Dec 21

http://www.spiegel.de/fotostrecke/fotostrecke-62886-12.htmlhttp://www.bbc.co.uk/news/world-europe-12042213


Boston winter 2011

http://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstormshttp://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstorms

http://boston.cbslocal.com/2011/02/01/bostons-top-ten-snow-storms-of-all-time/

Boston, Winter 2011

Jan 21, 2011

Jan 27, 2011

Snow Measurements at Logan Airport:

1. February 17-18, 2003 27.5”2. February 6-7, 1978 27.1”3. February 24-27, 1969 26.3”4. March 31-April 1, 1997 25.4”5. January 22-23, 2005 22.5”6. January 20-21, 1978 21.4”7. March 3-5, 1960 19.8”8. February 16-17, 1958 19.4”9. February 8-10, 1994 18.7”10. January 7-8, 1996 18.2”10. December 20-22, 1975 18.2”10. December 26-27, 2010 18.2”


“Bundle Up, It’s Global Warming”http://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstormsJudah Cohen, December 25, 2010, NY Timeshttp://www.nytimes.com/2010/12/26/opinion/26cohen.html?_r=1

“All of this cold was met with perfect comic timing by the release of a World Meteorological Organization report showing that 2010 will probably be among the three warmest years on record, and 2001 through 2010 the warmest decade on record.”

On Dec 29, 2010: Climate Change Dispatch writes:

“George Ifft, the American consul at Bergen, Norway, reported in 1922 the disappearance of icebergs….”

http://climatechangedispatch.com/home/8388-snow-blind


What has happened to date
What Has Happened to Date:http://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstorms

  • Temperatures rose 1-2 F during 1906-2005

  • Sea level rise:

    • In UK, increases of 2-4 inches since 1920

    • In India, about 0.12 inches a year until 2000, since then, about 0.2 inches annually

  • Carbon dioxide, CO2, in atmosphere increased from 316 ppm in 1959 to 386 ppm in 2008. (CO2 is believed by many to warm the planet.)

    From Tom Pfaff and http://www.epa.gov/climatechange/science/stateofknowledge.html and http://www.esrl.noaa.gov/gmd/ccgg/trends/index.html#mlo and http://www.cbsnews.com/stories/2010/03/24/world/main6329339.shtml and http://www.decc.gov.uk/en/content/cms/statistics/climate_change/data/data.aspx


Average global temperature
Average Global Temperaturehttp://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstorms

http://data.giss.nasa.gov/gistemp/tabledata/GLB.Ts.txt


Hockey stick graph introduced in 1998 by michael mann
Hockey Stick Graphhttp://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstormsintroduced in 1998 by Michael Mann

Intergovernmental Panel on Climate Change

A nearly yearlong effort by Attorney General Kenneth T. Cuccinelli II of Virginia to force the University of Virginia to turn over the documents of a prominent climatologist is headed to the state’s Supreme Court.

John Collins Rudolf,

New York Times March 12, 2011

http://green.blogs.nytimes.com/2011/03/12/hearing-is-set-in-climate-fraud-case/


Sea level rise in uk aberdeen in northeast and newlyn in southwest
Sea Level Rise in UK http://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstormsAberdeen in northeast and Newlyn in southwest

100 mm is about 4 inches

http://www.decc.gov.uk/en/content/cms/statistics/climate_change/data/data.aspx


Alaskahttp://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstorms

“Future sea-level rise is an important issue related to the continuing buildup of atmospheric greenhouse gas concentrations.”

Alley, Richard B., Peter U. Clark, Philippe Huybrechts, and Ian Joughin (2005). "Ice-Sheet and Sea-Level Changes". Science 310

Pictures from www.globalwarmingart.com


Pictures from http://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstormswww.globalwarmingart.com


The Arctichttp://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstorms

Sept 12, 2009

“two merchant ships completed an historic shortcut over the once ice-bound top of the world.”

http://drake.marin.k12.ca.us/academics/rock/bears_files/polar-ice-caps-melting.jpg

http://www.dailymail.co.uk/news/worldnews/article-1213025/Melting-ice-cap-opens-Northeast-Passage-British-ships.html#ixzz1BS647LMq

http://euobserver.com/9/26723


Carbon dioxide levels
Carbon Dioxide Levelshttp://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstorms

http://cdiac.ornl.gov/new/keel_page.html


Modeling carbon dioxide levels
Modeling Carbon Dioxide Levelshttp://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstorms

http://cdiac.ornl.gov/new/keel_page.html


Montreal treaty and cfcs signed september 16 1987 went into force january 1 1989

http://www.theozonehole.com/cfc.htmhttp://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstorms

Montreal Treaty and CFCs: Signed September 16, 1987; went into force January 1, 1989


Montreal treaty and cfcs signed september 16 1987 went into force january 1 19891

http://www.theozonehole.com/cfc.htmhttp://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstorms

Montreal Treaty and CFCs: Signed September 16, 1987; went into force January 1, 1989


What are the projected growth patterns
What are the Projected Growth Patterns?http://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstorms

  • The carbon dioxide level increased by 1.3 ppm per year:

    Linear (if continued)

  • The carbon dioxide level increased at a continuous rate of 0.4% per year (an annual increase of 0.4%):

    Exponential (if continued)

  • The CFC usage decreased at a continuous rate of 18.7% per year (an annual decrease of 18.3%):

    Exponential (if continued)


Teaching opportunities rates of change and projections
Teaching Opportunities: http://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstormsRates of Change and Projections

  • Slope

  • Linear and exponential growth

  • Change and percent change

  • Rate of change and percent rate of change

  • The number e

  • Continuous and annual rate of change

  • Extrapolation and interpolation

    Question: Are the changes significant?


Richard http://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstormsLindzen, Meteorologist, MITdoesn’t believe warming will be substantialhttp://www.sourcewatch.org/index.php?title=Richard_S._Lindzenhttp://www.heartland.org/events/NewYork09/

  • "I think it's [concern about global warming] mainly just like little kids locking themselves in dark closets to see how much they can scare each other and themselves." http://www.sourcewatch.org/index.php?title=Richard_S._Lindzen

  • NOVEMBER 30, 2009

  • “The Climate Science Isn't Settled: Confident predictions of catastrophe are unwarranted.”

  • http://online.wsj.com/article/SB10001424052748703939404574567423917025400.html


What is Predicted for the Future?http://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstorms

  • Temperatures will rise about 3˚C (so 5-6˚F) over the next century, perhaps accelerating

  • Polar ice caps and Greenland’s ice sheet will melt further

  • Sea levels will rise about 1 meter over the next century, leading to flooding

  • Carbon dioxide in atmosphere will increase, perhaps accelerating

From Intergovernmental Panel on Climate Change (IPCC) and http://www.esrl.noaa.gov/gmd/ccgg/trends/ and http://data.giss.nasa.gov/gistemp/tabledata/GLB.Ts.txt


Why are ice caps and glaciers melting
Why Are Ice Caps and Glaciers Melting?http://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstorms

  • Average global temperature is rising

    • Past decade was warmest on record

  • Why is the temperature rising?

    • Due to increase in greenhouse gasses in atmosphere, especially carbon dioxide (CO2)

  • What causes the increase in CO2?

    • This is where the controversy lies:

      • Man-made or natural?

      • Systematic trend or random fluctuations?

      • How much change will there be in the future?


What is the evidence that co 2 causes temperature to increase
What is the Evidence that COhttp://www.boston.com/news/local/massachusetts/gallery/2010_2011_snowstorms2 Causes Temperature to Increase?

  • Two types of evidence:

    • Data shows an association

    • A scientific mechanism

  • Historical data shows temperature and CO2 tend to fluctuate together—but the relationship might not be causal

  • There is a scientific mechanism explaining how an increase in CO2 causes temperature increases

  • But some still doubt that the changes are large enough to be a problem


What is the effect of increasing carbon dioxide in the atmosphere
What is the Effect of Increasing Carbon Dioxide in the Atmosphere?

Data http://data.giss.nasa.gov/gistemp/tabledata/GLB.Ts.txt and http://cdiac.ornl.gov/new/keel_page.html


Other ways of looking at the same data
Other Ways of Looking at the Same Data Atmosphere?

Data http://data.giss.nasa.gov/gistemp/tabledata/GLB.Ts.txt and http://cdiac.ornl.gov/new/keel_page.html


Evidence of Association Atmosphere?

Graph of carbon dioxide (CO2) (green), temperature (blue), and dust concentration (red) measured from the Vostok, Antarctica, ice core …(Petit et al. 1999). The close correspondence between carbon dioxide changes and temperature changes is a characteristic feature of the recent ice ages …… the greenhouse gas feedbacks indicated here are believed to be responsible for most of the ice age climate change …… (Weaver et al. 1998). Higher dust levels are characteristic of cold, dry periods.


Teaching opportunities carbon dioxide and average temperature
Teaching Opportunities: Carbon Dioxide and Average Temperature

  • Graphs

    • Axes and scales

  • Correlation

    • Range of values

    • Interpretation

    • Relation to causation

  • Establishing causation

    • Scientific mechanism


Is the temperature rise significant
Is the Temperature Rise Significant? Temperature

Practical versus Statistical Significance


http://www.brophygen.com/ Temperature

Sea levels will rise about 1 meter over the next century

http://www.epa.gov/climatechange/effects/coastal/slrmaps_ne_mass.html


At Risk of Flooding from Sea Level Rise Temperature

Maps all from Sea Level Explorer, www.globalwarmingart.com


Nepal Temperature

Cabinet Meeting:

Everest Base Camp

Dec 4, 2009

Maldives

Cabinet Meeting: President Nasheed

Oct 17, 2009

http://www.npr.org/templates/story/story.php?storyId=121079253

http://news.xinhuanet.com/english/2009-12/04/content_12588821.htm

http://www.telegraph.co.uk/news/newstopics/howaboutthat/6356036/Maldives-government-holds-underwater-cabinet-meeting.html


“For nearly 30 years, India and Bangladesh have argued over control of a tiny rock island in the Bay of Bengal. Now rising sea levels have resolved the dispute for them: the island's gone.”

http://www.guardian.co.uk/world/cif-green/2010/mar/24/india-bangladesh-sea-levels

http://www.independent.co.uk/news/world/asia/rising-seas-claim-island-at-centre-of-30year-dispute-1927002.html

http://www.cbsnews.com/stories/2010/03/24/world/main6329339.shtml


Is the temperature rise significant1
Is the Temperature Rise Significant? Temperature

Practical versus Statistical Significance


Nenana ice classic alaska

http://www.nenanaakiceclassic.com/ Temperature

Nenana Ice Classic, Alaska

Putting up tripod; March 6, 2011

April 23, 2010



Teaching opportunities temperature and nenana ice classic
Teaching Opportunities: Temperature Temperatureand Nenana Ice Classic

  • Linear Regression

  • Interpolation and extrapolation

  • Interpretation of Slope

  • Confidence Intervals

  • P-value

  • Practical versus Statistical significance


“Warming increases the risk of civil war in Africa” Temperature

M. Burke at al, Proceedings of the National Academy of Sciences, Dec 8, 2009

Panel regression of civil war incidence suggests that increases in temperature are more strongly related to an increase in civil wars than are changes in precipitation. (Previous studies suggested precipitation was important because if its role in agriculture.) The next slide shows the predicted change in civil wars till 2030.


Analysis in “Warming increases the risk of civil war in Africa” predicts a roughly 54% increase in civil war conflicts by 2030


Civil War: Somali Piracy Africa” predicts a roughly 54% increase in civil war conflicts by 2030

17 January 2011

“Maritime piracy costs the global economy between $7 billion and $12 billion a year” http://af.reuters.com/article/topNews/idAFJOE70G09720110117

From NATO

March 17. 2011

At 0612 UTC / 17 MAR / a merchant vessel was reported under attack by 1 skiff from nearby suspected pirate mothership SINAR KUDUS.

http://www.shipping.nato.int/CounterPir/copy_of_copy_of_SOMALIAPIR

http://news.blogs.cnn.com/2011/01/18/report-2010-was-worst-year-yet-for-piracy-on-high-seas/

Why Somalia?

For 20 years, there’s been no government

http://news.bbc.co.uk/2/hi/africa/8010061.stm


Teaching opportunities climate data and civil wars
Teaching Opportunities: Africa” predicts a roughly 54% increase in civil war conflicts by 2030 Climate Data and Civil Wars

  • Descriptive statistics

    • Percentage vs. percentage point

    • Median, interquartile range

    • Box plots, error bars

  • Regression tables

    • Linear functions of several variables

  • Significance levels

  • Parameter estimates

    • Standard errors

  • Bootstrap simulations


How good is the data we are using
How Good Is the Data We Are Using? Africa” predicts a roughly 54% increase in civil war conflicts by 2030

  • How can we check?

  • What biases might it have?

    • Who collected it?

    • Why was it collected?

    • Compare with other data sets


Temperature Africa” predicts a roughly 54% increase in civil war conflicts by 2030

Global mean land-ocean temperature index, 1880 to present. The dotted black line is the annual mean and the solid red line is the five-year mean. Green bars show uncertainty estimates.

http://data.giss.nasa.gov/gistemp/graphs/Fig.A2.lrg.gif


US Greenhouse Gas Emissions Compared Internationally Africa” predicts a roughly 54% increase in civil war conflicts by 2030

http://cait.wri.org/figures.php?page=/USToIntlGHGMap-Regions


Dr. Pieter Tans, NOAA/ESRL (www.esrl.noaa.gov/gmd/ccgg/trends/)

Atmospheric Carbon Dioxide

Carbon dioxide data from Mauna Loa started by David Keeling in March of 1958. The red line is the monthly mean values. The black line represents the same, after correction for the average seasonal cycle.


Charles david keeling scripps institution of oceanography san diego
Charles David Keeling (www.esrl.noaa.gov/gmd/ccgg/trends/), Scripps Institution of Oceanography, San Diego

At Mauna Loa, Hawaii, data on carbon dioxide has been collected since the 1950s with Dave Keeling’s “legendary exactitude”

http://www.nytimes.com/2010/12/22/science/earth/22carbon.html

http://green.blogs.nytimes.com/2010/12/21/does-the-keeling-curve-still-need-a-keeling/

http:// e-education.psu.edu


Keeling Oxygen Curve (www.esrl.noaa.gov/gmd/ccgg/trends/)

Ralph Keeling has produced a record of atmospheric levels of oxygen. … that is helping scientists understand what to expect from climate in the future.

http://scrippsco2.ucsd.edu/home/index.php

In his colleagues’ view, he has established a record of painstaking measurement that nearly matches his father’s legendary exactitude.

http://green.blogs.nytimes.com/2010/12/21/does-the-keeling-curve-still-need-a-keeling/#more-85421


Teaching opportunities carbon dioxide levels
Teaching Opportunities: (www.esrl.noaa.gov/gmd/ccgg/trends/)Carbon Dioxide Levels

  • Curve fitting and prediction:

    • Linear, exponential, periodic

    • Long-term behavior of functions

    • Averages and smoothing

    • Calculus:

    • Optimization

    • Least squares


Issues for discussion
Issues for Discussion (www.esrl.noaa.gov/gmd/ccgg/trends/)

  • How should we balance context and quantitative methods?

  • How do we teach students to transfer a quantitative technique from one context to another?

  • What is the best way to get students up to speed if they know little about the context?

  • How can weinclude students with different political perspectives?


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