By Michael Allaby
The books during this sequence make up an introduc tion to the technology of climate for all readers elderly 11 a nd over. The six volumes within the sequence are - Tornadoes, Drou ghts, Blizzards, Hurricanes, Floods, and A Chronology of Wea ther. '
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Additional info for Blizzards (Facts on File Dangerous Weather Series)
Farmers and gardeners know that a cover of snow protects the plants beneath it by insulating them. Snow is a poor conductor of heat, so a layer of snow greatly reduces any further cooling of the covered surface. Snow also falls on frozen sea and, because the temperature of the sea ice is already below freezing, it set- When the conveyor weakens or fails tles. In time it can form a thick layer. This reduces the rate at which the temperature falls in the water beneath the ice. When the conveyor weakens or fails The Great Conveyor has flowed reliably throughout recorded history.
At Qaanaaq, the average temperature ranges from a high of 46°F (8°C) in July to a low of –21°F (–29°C) in February. Both places are dry, despite all the snow and ice. 5 inches (64 mm). 5 mm). The temperature range is similar for both: 64°F (36°C) at Vostok and 67°F (37°C) at Qaanaaq. The difference is that Vostok is much colder than Qaanaaq. This is because Qaanaaq is on the coast, albeit of an ocean that is frozen over for much of the year, and Vostok is in the interior of a large continent. The North Pole is located in the Arctic Ocean and the Arctic Basin is sea, surrounded by Eurasia, North America, and Kalaallit Nunaat.
This is because our bodies cool themselves by sweating and allowing sweat to evaporate from the skin. Evaporation absorbs latent heat (see the sidebar on the discovery of latent heat in the section “What happens when water freezes and ice melts,” page 99) and this cools the skin. If the air is very moist, however, it may be unable to hold any more water vapor. Consequently, sweat fails to evaporate. It soaks our clothes, trickles down our faces, and no longer cools us as it should, so we feel hot and uncomfortable.