class #12: thursday, july 22 climate types
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Class #12: Thursday, July 22 Climate types. Chapter 17. Global Climate. Chapter 17. A World with Many Climates. Micro, meso , macro Global Climate Climate controls Latitude Land and water Ocean currents Prevailing winds Pressure cells Mountain barriers Altitude. - PowerPoint PPT PresentationTRANSCRIPT
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Class #12: Thursday, July 22Climate types
Chapter 17
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Class #12, Thursday, July 22 2
Global Climate
Chapter 17
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A World with Many Climates Micro, meso, macro Global Climate Climate controls
LatitudeLand and waterOcean currentsPrevailing windsPressure cellsMountain barriersAltitude
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A World with Many Climates
• Global temperatures– East-west isotherms– Bends or kinks due to ocean currents and
continents• Global precipitation– Precipitation occurs consistently where low
pressure belts exist in the Global Circulation Model
– Mountains, rain shadow
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Class #12, Thursday, July 22 5Fig. 17-CO, p. 468
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Class #12, Thursday, July 22 10Fig. 1, p. 475
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A World with Many Climates
• Topic: Precipitation Extremes– Rainiest locations on windward side of mountains– Driest locations in frigid polar regions
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Climate Classification
The Ancient GreeksTropical, temperate, and polar zone
The Köppen SystemWaldimir KöppenRelated vegetation and climate in order to predict
climate types in areas without climate data The Thornthwaite System
P/E ratio, P/E IndexPotential Evapotranspiration
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Class #12, Thursday, July 22 15Stepped Art
Fig. 17-6, p. 477
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The Global Pattern of Climate
• Tropical Moist Climates (Group A)– General characteristics: year-round warm
temperatures abundant rainfall– Extent: northward and southward from the
equator to about 15º to 25º– Major Types: tropical wet (Af), tropical monsoon
(Am), tropical wet and dry (Aw)
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Class #12, Thursday, July 22 19Table 17-1a, p. 480
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Class #12, Thursday, July 22 20Table 17-1b, p. 480
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The Global Pattern of Climate
• Dry Climates (Group B)– General Characteristics: deficient precipitation
most of the year; potential evaporation and transpiration exceed precipitation
– Extent: the subtropical deserts extend roughly 20º and 30º latitude in large continental regions of the middle latitudes, often surrounded by mountains
– Major Types: arid (BW), semi-arid (BS)
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The Global Pattern of Climate
• Observation: Deserts with Clouds and Drizzle– A desert that owes it existence, in part, to its
proximity to cold ocean water and, in part, to the position and air motions of the subtropical high pressure cell.
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Class #12, Thursday, July 22 34Fig. 2, p. 487
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The Global Pattern of Climate
• Moist Subtropical Mid-latitude Climates (Group C)– General Characteristics: humid with mil winters– Extent: on the eastern and western regions of
most continents, from about 25º to 40º latitude– Major types: humid subtropical (Cfa), marine
(Cfb), Mediterranean (Cs)
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The Global Pattern of Climate
Moist Continental Climates (Group D)General characteristics: warm-to-cool summers and
cold winters; winters are severe with snowstorms, blustery winds, bitter cold; climate controlled by large continents
Extent: north of moist subtropical mid-latitude climates
Major types: humid continental with hot summers (Dfa), humid continental with cool summers (Dfb), subpolar (Dfc)
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Class #12, Thursday, July 22 42Table 1, p. 492
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Class #12, Thursday, July 22 43Fig. 3, p. 492
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Class #12, Thursday, July 22 44Fig. 4, p. 493
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The Global Pattern of Climate
• Topics: Dry Spells and Drought– Drought :a period of abnormally dry weather– Dry spell: normal seasonal dry period
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The Global Pattern of Climate
• Polar Climates (Group E)– General Characteristics: year-round low
temperatures– Extent: northern coastal areas of North America
and Eurasia; Greenland and Antarctica– Major types: polar tundra (ET), polar ice caps (EP)
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The Global Pattern of Climate
• Highland Climates (Group H)– Decrease in temperature with elevation– Vertical zonation
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Class #12, Thursday, July 22 55Table 17-2, p. 499
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Class #12, Thursday, July 22 56Table 17-3, p. 499