Name Section EXERCISE 24 PROBLEMS-PART I The following questions are based on Fi
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Name Section EXERCISE 24 PROBLEMS-PART I The following questions are based on Figure 24-5, showing variations in CO2 and temperature aniomalies in Antarctica going back 800,000 years. This temperature record shows the major glaci al (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. Was there any time in the last 800,000 years when temperature in the Antarctic was higher than it is today? If so, when? 2. Were there times over the last 800,000 years when temperature in the Antarctic was lower than today? If so, how much colder? 3. 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? What appears to happen more abruptly, the onset of a glacial period or the onset of an interglacial period? Why do you say this? 5. What is the general correlation between the concentration of CO2 and temperature in the Antarctic over the last 800,000 years, as shown in Figure 24-5? 6. Research suggests that over the last few hundreds of thousands of years, changes in atmospheric CO2 concentration sometimes lagged behind a temperature increase by perhaps 1000 years-indicating that "feedback" loops associated with a warmer climate might lead to increasing CO2 in the atmosphere rather than the other way around. 7. (a) Are any such "lags" visible in Figure 24-5? Looking at Figures 24-1 and 24-2, does the recent increase in global temperatur exhibit such a lag? (b)Explanation / Answer
According to Chegg rules and regulations, if mltiple questions are asked the it is appropriate to anser the first full question only. Hence considering chegg condition i will be ansering question 1 completely.
Considering the figure 24-5 in the given question, the atmospheric CO2 level in the air are higher today than compared to any time during the past 8,00,000 years back. The figure comprises of cyclical temperature pattern variation that constitutes the ice ages. So during this cycles, changes in CO2 concentration is closely in track with temperature change with CO2 lagging behind the temperature change. The reason is it takes a while for snow to compress to ice. The records what we have of 8,00,000 years, the average global carbon dioxide levels varied between 170ppm and 280ppm. But when humans started to burn fossils in the industrial area, things changed drastically. In these 8,00,000 years record it has been analysed that it took about thousand years for carbon dioxide levels to increase by 35ppm. The changes see in carbon dioxide levels has recently changed more rapidly than the natural historical trends. Homo sapiens evolved about 2,00,000 years back but ice-core records reveal details of our planet history even before the human existed. Using this track scientist can determine how temperature and atmospheric CO2 levels have fluctuated until now.
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