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FIGURE 1.2. A north-south section of topography relative to sea level (in meters) along the Greenwich meridian (0° longitude) cutting through Fig. 9.1. Antarctica is over 2 km high, whereas the Arctic Ocean and the south Atlantic basin are about 5 km deep. Note how smooth the relief of the land is compared to that of the ocean floor.

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FIGURE 1.2. A north-south section of topography relative to sea level (in meters) along the Greenwich meridian (0° longitude) cutting through Fig. 9.1. Antarctica is over 2 km high, whereas the Arctic Ocean and the south Atlantic basin are about 5 km deep. Note how smooth the relief of the land is compared to that of the ocean floor.

TABLE 1.2. The most important atmospheric constituents. The chlorofluorocarbons (CFCs) CCI2F2 and CCI3F are also known as CFC-12 and CFC-11, respectively. [N.B. (ppm, ppb, ppt) = parts per (million, billion, trillion)] The concentrations of some constituents are increasing systematically because of human activity. For example, the CO2 concentration of 380 ppm was measured in 2004 (see Fig. 1.3); CFCs are now decreasing in concentration following restrictions on their production.

TABLE 1.2. The most important atmospheric constituents. The chlorofluorocarbons (CFCs) CCI2F2 and CCI3F are also known as CFC-12 and CFC-11, respectively. [N.B. (ppm, ppb, ppt) = parts per (million, billion, trillion)] The concentrations of some constituents are increasing systematically because of human activity. For example, the CO2 concentration of 380 ppm was measured in 2004 (see Fig. 1.3); CFCs are now decreasing in concentration following restrictions on their production.

Chemical

Molecular

Proportion

Chemical

Molecular

Proportion

species

weight (g mol-1)

by volume

species

weight

by volume

n2

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