Atmosphere Flashcards

1
Q

explain the surplus/deficit of energy at equator/poles

A
  • high albedo at poles/low albedo at equator
  • more atmsphr to pass thru at poles bc curve = more likely to be reflected by clouds
  • no winter solistice so sun always at equator, 24hr darkness at poles
  • sun more conc at equator bc insolation is greatest where rays vertically hit
  • suns angle in sky decreases towards pole bc curve = heat energy spread over larger surface
  • tilt of axis means sun higher in tropics thru year, focusing energy
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2
Q

account for insolation reaching earths surface

A
  • 46% absorbed by earth’s surface
  • 17% reflected by clouds, 88% by gas particles
  • 6% reflected by light surfaces (eg ice) on earth
  • 23% absorbed by clouds, dust, water vapour etc
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3
Q

describe atmospheric circulation cells & trade winds in the northern hemisphere

A
  • hadley formed 0 - 30N & thermally direct
  • trade winds move SW towards equator
  • ferrel formed 30N - 60N & thermally indirect
  • westerly winds complete cell and take air NE
  • polar cell - air sinks at poles & movess from 60N to 90N
  • polar easterlies take cold air south
  • warm air from equator moved to higher latitudes
  • cold air from poles move to lower latitudes
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4
Q

explain energy redistribution

A
  • winds deflected right bc coriolis effect
  • winds move from high to low pressure
  • air forced to rie at equator bc heat & convection currents
  • air sinks at poles bc cool
  • cells and winds transfer surplus energy to deficit
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5
Q

oceanic circulation in N hemisphere: atlantic

A
  • in n hemisphere, a CW loop/gyre is formed
  • C effect deflects ocean current to right in n hemisphere
  • land mass of americas deflects ocean currents towards the caribbean sea
  • north equatorial current pushes surface water westwards, until obstruction via land masses pushes water north]
  • SW winds push gulf stream NE towards europe as north atlantic drift
  • currents like north atlantic drift carry warm waters to cooler latitudes
  • cold waters move south from poles via Labrador Current
  • this is a deepwater current bc water is denser at poles bc salinity and temp
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6
Q

explain pattern of rainfall in W africa

A
  • dependent on movement of ITCZ, meeting point of cT & mT air masses
  • ITCZ = zpne of convergence btw warm, wet, low p, unstable mT & hot, dry, high p, stable cT
  • warm, moist air forces to rise, colling & condensing into clouds = low pressure
  • ITCZ migrates N to S throughout yr w/ passage of overhead sun, thermal equator
  • as it moves N to position overhead the tropic of cancer, it brings associated band of rainfall w/it = rainy season Apr-Oct
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