4) The Keeling curve is shown at right. A. What do scientists think causes the yearly oscillation in CO2 Levels? B. What do scientists think has caused the overall rise in the Keeling curve since 1960? C. Burning hydrocarbons gives the same end products as aerobic respiration. Based on this, make a prediction of what has happend to the oxygen concentration in the atmosphere since 1960. CO2 concentrations regularly cycle up and down over the course of a year. CO2 concentration Jan Apr Jul Oct Jan Month CO2 concentration (ppm) 390 380 370 360 350 340 330 320 310 1960 1970 1980 1990 2000 2010 Year Atmospheric levels of CO2 show a steady increase over the last 50 years.
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The yearly oscillation in CO2 levels is primarily caused by the seasonal changes in plant growth and decay. During the growing season, plants absorb CO2 from the atmosphere for photosynthesis, which causes a decrease in CO2 levels. In contrast, during the decay Show more…
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The increase in Carbon Dioxide (CO2) in the atmosphere is a major cause of climate change. The Keeling curve, named after Professor Charles David Keeling, gives the average amount of CO2 (measured in parts per million volume or ppmv) in the atmosphere from 1958 to 2013. Let A(t) be the average amount of CO2 in the atmosphere at time t, where t is measured in years, with t = 1 corresponding to 1958. Year Amount of CO2 1958 315 1970 325 1974 330 1978 335 1985 345 1991 355 1998 365 2003 375 2007 380 2010 390 2013 395 Model: A(t) = (a) (4 marks) Draw a scatter plot of the data in the box given. Use your calculator to find a mathematical model to fit the data. (b) (2 marks) Use your model to estimate the amount of CO2 in the atmosphere in 1980. (c) (2 marks) Assume the trend continued, and use the model to predict the average amount of CO2 in the atmosphere in 2019.
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