Chapter #7.3 Solutions - Understanding Weather and Climate - James E Burt, Edward Aguado - 7th Edition

1fa. Fog Seeding at AirportsSeeding is sometimes used to clear fogs along airport runways. If a fog exists at temperatures below 0°C (32°F), introducing dry ice can instigate the Bergeron process, as it does in clouds. Some of the water droplets freeze into ice crystals, which grow at the expense of water droplets and fall out of the fog as snow, leaving a local area of clear air, Of course, this technique can only work for fogs containing supercooled droplets, which is the exception rather than the norm.Missoula (Montana) International Airport has had ongoing success seeding fog since 2006. Carbon dioxide is sprayed from a couple of pickup trucks into the air just upwind from the runways to stimulate localized snowfall out of the fog. Flights that would ordinarily have been cancelled are now often allowed to take off and land, sometimes with only minor delays. On average this technique is used about five times each year at Missoula.Several other methods have been tried for dispersing warm fogs, including flying helicopters over the runways to force down the warm air within a radiation inversion and introducing salt crystals into the fog with the intent of making some droplets larger—thereby accelerating growth by collision and coalescence (Figure 7-3-1).FIGURE 7-3-1 Fog over the Missoula Valley, Montana....Through what process does cloud seeding assist in fog dispersal? Get solution

2fa. Fog Seeding at AirportsSeeding is sometimes used to clear fogs along airport runways. If a fog exists at temperatures below 0°C (32°F), introducing dry ice can instigate the Bergeron process, as it does in clouds. Some of the water droplets freeze into ice crystals, which grow at the expense of water droplets and fall out of the fog as snow, leaving a local area of clear air, Of course, this technique can only work for fogs containing supercooled droplets, which is the exception rather than the norm.Missoula (Montana) International Airport has had ongoing success seeding fog since 2006. Carbon dioxide is sprayed from a couple of pickup trucks into the air just upwind from the runways to stimulate localized snowfall out of the fog. Flights that would ordinarily have been cancelled are now often allowed to take off and land, sometimes with only minor delays. On average this technique is used about five times each year at Missoula.Several other methods have been tried for dispersing warm fogs, including flying helicopters over the runways to force down the warm air within a radiation inversion and introducing salt crystals into the fog with the intent of making some droplets larger—thereby accelerating growth by collision and coalescence (Figure 7-3-1).FIGURE 7-3-1 Fog over the Missoula Valley, Montana....What chemical is used in airport fog dispersal? Get solution


Chapter #17 Solutions - Understanding Weather and Climate - James E Burt, Edward Aguado - 7th Edition

1c. What happens to light if it enters a medium of higher density? Get solution 1ct. Consider the way the apparent position of the...