EESA09H3 Lecture : Wind-Lecture6.doc
1 Jul 2013
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Cyclones forming over the open sea in polar regions (usually cold but need warm temp. to be heated to. Sometimes called arctic hurricanes due to well defined eye the winds are not so strong and that"s why the storm is generally. Winds must be gale force (>17m/s) short lived. How do they form: continental cold arctic air (cp or ca) moves over open sea water (relatively warm) The cold air mass over the land mass of the arctic zone, it moves over to the ocean and the ocean water surface temp. is much higher temperature that causes the change in phase!!! Heat source (sensible and latent) of the open sea fuels the storm therefore, huge substantial difference in: in many ways similar to hurricanes: Sea surface temperatures (ssts) as energy source. The latitude of formation: hurricanes occur in tropical regions, polar lows occur in polar regions.
