Answer Happy

Name Section EXERCISE 24 PROBLEMS-PART II The following questions are based on Figures 24-8 and 24-9, charts showing the change in atmos- pheric carbon dioxide measured at the Mauna Loa Observatory in Hawai'i, from 1958 to April 2016, Atmospheric Carbon Dioxide at Mauna Loa Observatory 420 RECENT MONTHLY MEAN CO, AT MAUNA LOA 406 400 Scripps Inton of Oceanography NOAA Earth System Research Laboratory 400 380 PARTS PER MILLION PARTS PER MILLION 360 395 340 חחח 3230 300 2012 2013 2016 2017 1900 2014 2015 YEAR 1970 1990 2000 2010 2020 2030 1990 YEAR Figure 24-8: Atmospheric carbon dioxide measured at Mauna Loa Observatory, Hawai'i, from January 2012 to April 2016. The dark line is the seasonally cor- rected value. (Adapted from NOAA) Figure 24-9: Atmospheric carbon dioxide measured at Mauna Loa Observatory. Hawai'i, from 1958 to April 2016. The dark line is the seasonally corrected value. (Adapted from NOAA) 1. What is the approximate variation in CO, concentration each year? ppm 2. Notice that the concentration of CO, in the atmosphere reaches its highest point at the same time each year. (a) During which time of year does CO, reach its highest point? (b) What explains the timing of the annual fluctuation in CO,? (Hint: Think about the process of photosynthesis and plant respiration, and the locations of large forests on Earth.) 3. If the current trend continues, estimate when the seasonally adjusted atmospheric CO, levels will reach 420 ppm.