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EESA09 Lecture#6

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Environmental Science
Tanzina Mohsin

Polar Lows Formation and Duration Where do they form? -For hemisphere: atlantic, pacific and Canadian seas BUT limited by sea ice condition because they need WARM open water surface. -Coldest month of the winter is February, therefore lowest occurrence of polar lows here Pacific – minimum is in JANUARY – due to the sea ice condition, possibly How can you compare polar lows and hurricanes? *** similarities and differences Fire Storms -Dry, arid regions of the world -can be caused by lightening, point-source, excessive solar radiation within dry areas of forests’ -are self-sustaining; like thunderstorms; convective cell. Can form pyrocumulus cloud.  How do they form? -whatever is causing the fire is burning oxygen (combustion), is also the fuel for the storm -air rises from fire forming the updraft -> chimney effect. For the thunderstorm, updraft and downdraft is called convective cell. -Absent: No latent heat here; no change of phases. Only thing that is fuelling storm is heat from fire, causing air to rise, and therefore storm is self-sustaining. Okanagan fire in BC Dust Storms -also form in arid regions -caused from dust or sand -the larger the particle size, you need stronger winds for the storm to develop -in arid regions, such as deserts, sand surface heats up intensely -this summer 110/112 degrees Celsius, huge du
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