ather Variability and Climate Change Name Section EXERCISE 24 PROBLEMS--PART I The following questions are based on Figu

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Ather Variability And Climate Change Name Section Exercise 24 Problems Part I The Following Questions Are Based On Figu 1 (57.04 KiB) Viewed 25 times

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ather Variability and Climate Change Name Section EXERCISE 24 PROBLEMS--PART I The following questions are based on Figure 24-5, showing variations in CO, and temperature anomalies in Antarctica going back 800.000 years. This temperature record shows the major glacial (cold) and interglacial (warm) periods of the later Pleistocene Epoch (2.58 million to 11,700 years ago) Was there any time in the last 800,000 years when the concentration of carbon dioxide was higher than it is today? 1. 2. Was there any time in the last 800,000 years when temperature in the Antarctic was higher than it is today? If so, when? 3. Were there times over the last 800,000 years when temperature in the Antarctic was lower than today? If so, how much colder? 4. Using the period of peak of temperature associated with an interglacial period for refer- ence, what was the approximate time interval between major periods of glaciation over the last 450,000 years? 5. What appears to happen more abruptly, the onset of a glacial period or the onset of an interglacial period? Why do you say this? 6. What is the general correlation between the concentration of Co, and temperature in the Antarctic over the last 800,000 years, as shown in Figure 24-5? 7. Research suggests that over the last few hundreds of thousands of years, changes in atmospheric CO, concentration sometimes lagged behind a temperature increase by perhaps 1000 years-indicating that "feedback" loops associated with a warmer climate might lead to increasing CO, in the atmosphere rather than the other way around. (a) Are any such "lags" visible in Figure 24-52 (b) Looking at Figures 24-1 and 24-2, does the recent increase in global temperature exhibit such a lag?
400 Carbon Dioxide (parts per million) Current concentration 1958 concentration 300 250 Momen this 200 5 Antarctic Temperature (°C) 0 -5 www -10 -15 800,000 600,000 200,000 0 400,000 Date (years before present) Figure 24-5: Carbon dioxide and temperature record for Antarctica over the last 800,000 years. CO, record derived from the EPICA Dome Cice core and other ice cores in Antarctica. Temperature record derived from Dome C data; temperature scale is relative to average temperature over the last 1000 years. (Adapted from Hess, McKnight's Physical Geography, 12th ed.)
400 MLHOTA Atmospheric samples (Mauna Loa) Ice core (Law Dome) 375 350 au Carbon Dioxide (parts per million) 325 300 Figure 24-1: Change in atmospheric carbon dioxide concentration from 1750-2015. The dark line shows values derived from ice cores at Law Dome, Antarctica; the light line shows measured values from Mauna Loa, Hawai'i. (From Hess, McKnight's Physical Geography, 12th ed.) 275 250 1750 1800 1850 1900 1950 2000 Year 166
EXERCISE 24: Weather Variability and Climate Change 0.75 0.50 Global Land-Ocean Temperature Index Data source: NASA/GISS Annual mean 5-year mean 0.25 Temperature Anomaly (0) 0.00 -0.25 امام بار بار ایسا 2020 2010 2000 -0.50 1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 Year Figure 24-2: Average global temperature over land and ocean, 1880-2014, showing temperature difference relative to the 1951-1980 average. (From Hess, McKnight's Physical Geography, 12th ed.)