Glossary |
Select a letter from the index given below,
to be shown those glossary items which begin with the same letter.
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I |
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Indigenous Australians have long held their own seasonal calendars
based on the local sequence of natural events. |
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Inshore |
The coastal waters zone adjacent to the coastline within which the majority of small craft operate and which is usually within 5 to 10 nautical miles of the coastline. |
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Inversion, temperature |
A temperature inversion occurs when the temperature of air increases with increasing height. Generally the temperature decreases with height in the lower atmosphere, called the troposphere. Low-level inversions generally form on clear calm nights due to cooling of the ground through loss of heat by radiation. The warm air on the ground is replaced by cooler air at the surface resulting in a temperature inversion. The inversion creates a boundary layer that restricts vertical motion and mixing of air between the two air masses either side. Low-level inversions act like a lid to trap pollutants resulting in smog over our cities. For further information please read http://www.bom.gov.au/info/ftweather/page_16.shtml
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ISA |
International Standard Atmosphere (ISA) is the 'average' atmosphere any pressure level
has a standard corresponding altitude called 'pressure altitude' and temperature called
the 'ISA temperature'. |
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Isobars |
Lines on weather maps joining places which have the same air pressure. |
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