# Physics 100 Lecture 17. The Greenhouse Effect and Global Warming November 8, 2016

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1 1 Physics 100 Lecture 17 The Greenhouse Effect and Global Warming November 8, 2016

2 4 Written Quiz Chapter 7 Timer applet

3 5 The Greenhouse Effect For an actual greenhouse, glass panels allow solar energy inside and suppress thermal convection that would cool the room In the planetary greenhouse effect, certain atmospheric gases such as CO 2, CH 4, NO x absorb infrared light (thermal radiation) emitted by the Earth, warming the atmosphere by preventing its escape into space.

4 6 The Greenhouse Effect

5 7 Earth s energy balance Earth s temperature depends on the balance between energy coming in from the sun and energy that is radiated back to space. (Figure 9.1) (174% input to atm) (174% output from atmosphere)

6 8 Global warming contributions (5%) by gas type (8%) (85%) Figure 9.5

7 9 Global warming contributions by sector (26%) (34%) (19%) Figure 9.5

8 10 Greenhouse Gases GWP conc

9 11 Your largest contribution to global warming in a year probably comes from A. your use of freon propellants B. your consumption of electricity C. driving your car D. your consumption of beef Response Counter 0% 0% 0% 0% A. B. C. D. 90

10 Atmospheric concentration CH 4 (ppb) Atmospheric concentration N 2 O (pbb) Atmospheric concentration CO 2 (ppm) Changes in Atmospheric Concentration CO 2, CH 4, and N 2 0 A Thousand Year History 360 Atmospheric changes Source: IPCC Third Assessment Report (2001) 12

11 Changes in Atmospheric Concentration CO 2, CH 4, and N 2 O A Ten Thousand Year History 13 Source: IPCC Synthesis Report (2007)

12 IPCC WGI Fifth Assessment Report Correlation with temperature 14

13 15 Recent CO 2 analysis See figure caption on the next slide. Citation: Physics Today 69, 11, 48 (2016); /PT

14 Figure 1. The relentless climb of atmospheric carbon dioxide. (a) Since the late 1950s, atmospheric CO 2 concentrations have been measured at the Mauna Loa Observatory in Hawaii and the South Pole Observatory in Antarctica. Figure The prominent caption annual cycles in the Mauna Loa record reflect the seasonal uptake and release of CO 2 by plants and soils in the Northern Hemisphere. The difference in CO 2 between Mauna Loa and the South Pole has grown larger as fossil-fuel emissions have increased because emissions are concentrated in the Northern Hemisphere. (b) The annual growth rate of CO 2 at Mauna Loa and the CO 2 growth rate expected from fossil-fuel emissions are plotted with the deviation in global temperature ΔT relative to the average. Except during strong El Niño conditions in and , the observed CO 2 growth rate is lower than expected from fossil-fuel emissions because of CO 2 uptake by the ocean and by plants and soils on land (see box 1). When temperatures are warm, as commonly found during El Niño periods (gray shading), CO 2 increases more rapidly. Strong volcanic eruptions (dashed vertical lines) generally result in cooler temperatures and slower rates of change in CO 2. (Atmospheric CO 2 concentration data courtesy of Scripps Institution of Oceanography, global temperature data courtesy of NASA, and fossil-fuel emissions data courtesy of Oak Ridge National Laboratory. Emissions estimates for from ref. 16.) Citation: Physics Today 69, 11, 48 (2016); full article 16

15 17 Effects of Global Warming (partial list) Extreme weather High temperatures, modified agriculture Enhanced rainfall some places, drought in others Stronger storms? Rising sea levels Warmer oceans Effect on sea creatures, coral, plants? Less dissolved CO 2 positive feedback (pp )

16 18 The situation is complicated... Warmer climate means more plant growth, carbon sequestration Deforestation makes the tropics more reflective, tends to cool the Earth More water vapor means more clouds, net cooling effect. Particulate air pollution (smog) has a similar effect. These are examples of negative feedback (pp )

17 19 Sea Level Rise of 17 Feet (5.2 m) Western Antarctic Ice Sheet Melts

18 Sea level rise simulations 11/08/2015

19 21 Thermohaline circulation It is postulated that fresh meltwater could interrupt the north Atlantic ocean circulation (see p. 285 of the textbook) The evidence is not very strong, see above link for Wikipedia discussion

20 22 Besides rising ocean levels, what effect might the melting of the polar ice caps have on the average global temperature? A. Cooling due to increased reflection of 92% sunlight B. Cooling due to decreased R-value of melted ice C. Warming due to decreased reflection of sunlight D. Warming due to increased thermal emission by ocean 0% 0% 8% A. B. C. D.

21 23 Air Pollution There are four main categories of air pollutants: Carbon (CO 2, CO, hydrocarbons) Sulfur (SO 2 ) Nitrogen (NO x ) Particulates

22 24 Carbon-based air pollutants CO 2 is toxic in high concentrations, but it is helpful for plants so it s not classified as a pollutant CO (carbon monoxide) is highly toxic and emitted by incomplete combustion of fossil fuels. In dense traffic CO levels can be sufficiently high to cause health problems Hydrocarbons (also known as Volatile Organic Compounds) participate in a variety of chemical reactions that form ozone and photochemical smog.

23 25 The carbon cycle Without human influence, the flow of carbon between the air, plants, and oceans would be roughly balanced Fossil fuel combustion adds about 9 billion tons (as of 2014) of carbon (primarily as CO 2 ) into the atmosphere Oceans contain 55 times as much carbon as the atmosphere, and 20 times as much as land plants

24 26 The Carbon Cycle Figure 9.9 (p.287) of the textbook, numbers (in billions of tons) seem old.

25 27 Carbon dioxide budget (Global Carbon Budget 2015) Figure 2 (p. 352). Schematic representation of the overall perturbation of the global carbon cycle caused by anthropogenic activities, averaged globally for the decade

26 28 Global Carbon Budget 2015 Another way to visualize the carbon cycle, with more recent data Figure 3 (p. 370). Combined components of the global carbon budget illustrated in Fig. 2 (in document linked above) as a function of time, for emissions from fossil fuels and industry (grey) and emissions from land-use change (brown), as well as their partitioning among the atmosphere (light blue), land (green), and oceans (dark blue). All time series are in GtC yr 1. See the text for more details of each component and their uncertainties.

27 Fossil Fuel carbon emission (Global Carbon Budget 2015) Figure 5 (p. 372). CO 2 emissions from fossil fuels and industry for (a) the globe, (b) global emissions by fuel type, (c) territorial (full line) and consumption (dashed line) emissions for the countries listed in the Annex B of the Kyoto Protocol versus non-annex B countries, (d) territorial CO 2 emissions for the top three country emitters and for the European Union, and (e) per capita emissions for the top three country emitters and the EU and the world. 29

28 Yet another way to visualize the carbon budget Citation: Physics Today 69, 11, 48 (2016); full article Each row of the diagram represents a carbon reservoir, with the amount of carbon in each reservoir in 1870 shown in the middle column in petagrams (1 Pg = g). The boxes and arrows to the left and right depict the carbon budget in petagrams for the period

29 31 Suppose your car barely passes the 3.0 gram/mile limit for CO emission. If you drive 15,000 mi/y, about how much CO has your car emitted in a year? A. 1,500 kg B. 450 kg C. 150 kg D. 45 kg Response Counter 0% 0% 0% 0% A. B. C. D. 150

30 32 Suppose your car barely passes the 3.4 gram/mile limit for CO emission. If you drive 15,000 mi/y, about how much CO has your car emitted in a year? A. 1,500 kg B. 450 kg 15,000 mi kg C. 150 kg year mi D. 45 kg 45 kg/y

31 33 How much air does the car poison? EPA air quality standard for CO: 9.0 ppm (p. 259) m M M V CO air kg kg M m 1.29 kg/m air 6 air air 3 6 3

32 34 How much air does the car poison? If the atmospheric density were constant, its depth P Pa h 8015 m g air 1.29 kg/m m/s 2 So the poisoned air would cover an area of A V h 6 3 air m 484 m 2 72 ft 72 ft 8015 m

33 35 How much air would all the cars in Wisconsin poison? If there were 3.0 million vehicles in Wisconsin, NA m 1, 450 km air That's the area that's poisoned annually. If all the air remained in Wisconsin, the air would be completely poisoned after t 140,673 km 2 97 years 2 1,450 km /yr

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