water’s influence on weather & climate
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Water’s Influence on Weather & Climate. Water’s Influence on Weather & Climate. Weather vs. Climate Think/Pair/Share Weather – The condition of the atmosphere at a specific time during the day. Climate – A region’s generalized weather patterns, averaged over several decades. - PowerPoint PPT PresentationTRANSCRIPT
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Water’s Influence on Weather & Climate
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Weather vs. Climate◦Think/Pair/Share
Weather – The condition of the atmosphere at a specific time during the day.
Climate – A region’s generalized weather patterns, averaged over several decades.
Water’s Influence on Weather & Climate
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Large bodies of water have a moderating effect on the climate of the nearby region◦Timmins, ON - 17°C in Jul, -18°C in Jan
◦Victoria, BC - 16°C in Jul, 5 °C in Jan What do you notice about the
temperature in Timmins vs. BC? *note – they are along the same line of latitude
The Moderating Effect
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Water has a higher heat capacity than land or air – takes longer to absorb heat, and longer to release heat◦Heat capacity – Ability of a material
to absorb heat
The Moderating Effect
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Effect:◦Day & Summer: Land gets hotter
than water; warm air on land rises, cooler air from water blows in to replace it Result: Cooler summers
The Moderating Effect
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Effect:◦Night & Winter: Water cools slower
than land; warm air over water rises and cooled air over land moves in Result: Milder winters
The Moderating Effect
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The Moderating EffectA helpful hint:
◦At your cottage, which way does the fire blow during the day? At night?
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A microclimate is an area with a localized climate variation that differs from the larger climate around it◦Ex. Point Pelee, ON – Sticks out into
Lake Erie◦Ex. A greenhouse
Microclimates
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Farmers living close to the Great Lakes experience a much longer frost-free period than farmers in other parts of Ontario
The warmer air from the lakes keeps nighttime temperatures on the shore above freezing longer into the fall
Microclimates & Farming
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Northern hemisphere - 39% land, 61% ocean
Southern hemisphere - 19% land, 81% ocean
Greater moderating effect on southern hemisphere’s climate
Water & Global Climate
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Coastal regions and other regions located near a large body of water tend to have more precipitation than regions further inland. ◦Why?
As air travels across the water, it picks up a large amount of moisture (water vapour)
Results in more precipitation (rain & snow) Coastal Storms – Hurricane Katrina
Water and Precipitation
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Water’s Influence on Weather & Climate
Read and complete workbook pages 158-160
In-class Assignment – Tuesday, October 25th