In 1992, Environment Canada developed the UV The other area of great concern is the reduction of Index to provide Canadians with updates of the the extent and thickness of sea ice that has been status of the ozone layer and information on the observed in the summer over the past few decades. [...] The The Government of Canada is especially concerned air warms adiabatically as it descends through about the future of the Arctic ozone layer, due to the the stratosphere into the troposphere in the polar country’s vast northern territories. [...] In the increases the pace of ozone destruction, however, stratosphere, the vertical and north-south compo- while the rate at which ozone is transported from nent of the wind circulation—rising in the tropics, the tropics falls off considerably and remains low moving towards the pole in middle latitudes and throughout the summer. [...] Because El Niños westerly phase, polar stratospheric temperatures also change normal pressure patterns in the upper tend to be lower, the Arctic vortex stronger, the troposphere, they alter the height of the tropopause, transport of ozone toward the pole reduced and affect the transport of ozone toward the poles, and ozone depletion greater. [...] For example, changes in ocean temperatures and the energy distribution in the atmosphere as a result of the warming of the lower atmosphere may be changing the dynamics of the Figure 12.
Authors
- ISBN
- 9781100107875
- Published in
- Canada