In order to test the hypothesis of increasing ground-level ozone levels, ozone data was obtained from the Mauna Loa observatory in Hawaii. This is considered an ideal location for observing global trends in atmospheric concentrations of ozone, carbon dioxide, and other substances. The data series consisted of maximum hourly observations of ozone per day, in parts per billion. The dates ranged from January 1, 2004 to September 20, 2012.
Ozone concentrations are indeed rising over this time interval (Pearson r = 0.08, P < .0001). The time series was then sliced into two, three different times by three cutpoints. The first cutpoint was the initiation of the energy bill (1/1/2008), the second was the BP oil spill (4/20/2010), and the third was the Fukushima catastrophe (3/11/2011). The ozone levels before and after these three events were compared using optimal discriminant analysis (ODA).
Comparison .................... Direction ... Effect Strength . P < Before & after energy bill ..... positive ......... 6.1% ..... 0.008 Before & after BP oil spill..... positive ......... 8.1% ..... 0.001 Before & after Fukushima ....... positive ......... 6.4% ..... 0.050
The best fit is obtained from the BP oil spill. Ozone certainly increased significantly after the energy bill went into effect, however. Fukushima effects are also significant, but at a lower level than the Deepwater Horizon disaster.
Effects of radioactive contamination on plants, and possible potentiation by ozone will be discussed in a future post.
IMPORTANT: I am developing a visual database on plant damage, which will include North America (to begin with), and will extend in time from 2008 to the present. It is located at:
Most of the photos are in Flickr. To zoom in, click on the picture, then click on "View all sizes" on the upper right, and then select the resolution you want. You can also zoom in using the mouse wheel while holding down the Ctrl key.
PLEASE HELP ME NAME THIS PROJECT. I need a catchy name that can be referred to by an acronym. GPFDP is not good. TIA.