pressure and winds

Question 1

air pressure

Answer 1

force exerted per uni tarea of the earth surface by the weight of a column of air above it (barometer)

• high if above sea level value

isobars: lines joining places of equal pressure

• air pressure decreases as altitude increases, less dense air

Question 2

wind

Answer 2

air moves from area of high pressure to area of low pressure
pressure gradient is the difference in pressure between the two areas
greater difference in pressure, steeper air pressure gradient, faster wind speed
(anemometer)

wind direction is the direction which wind is coming FROMMMMM (wind rose and vane)

wind frequency is the percentage of tike wind blows in a particular direction.
wind thaty blows most frequently in a particular direction is -> prevailing winds (wind rose)

Question 3

land and sea breeze

Answer 3

1. land breeze night
   - blows from land to sea
   - difference in rate in which land and water bodies cool -> difference in air pressure
   - land lose heat faster than sea at night
   - sea has higher temp and lower AP than land
   - wind blows from land to sea at night
2. sea breeze day
   - blows from sea to land
   - during day land heats up faster than sea
   - land temp higher but AP lower than sea
   - wind blows from sea to land

Question 4

monsoon winds

Answer 4

• regional wind patterns that reverse direction seasonally
• leads to precipitation
• coriolis effect -> bending, deflection of winds
• coriolis effect strongest near the poles, weak in tropics, not felt in equator

Question 5

southwest monsoon

Answer 5

1. southwest monsoon
   - june to september
   - northern hemisphere summer, high temp, low AP
   - southern hemisphere winter, low temp, high AP
   - diff in AP -> area moeves from area of high pressure to area of low AP
   - when air moves from australia, travels in southeast direction as winds gets deflected to left in southern hemi due to coriolis effect
   - once it passes equator, deflected to right, moving in southwest direction
   - southwest monsoon passes Indian ocean and picks up alot of moisture, bringing heavy rain to imdia and bangladesh

Question 6

northeast monsoon

Answer 6

2. october to jan
   - northern hemi winter, low temp, high AP
   - southern hemi summer, high temp, low temp
   - diff in pressure, pressure gradient, air move from area of hgher AP to area of lower AP
   - air moves from central asia in northern hemi to australia in southern hemi
   - air moves from central asia, travlling in northeast directionas winds get deflected from right in northern hemi due to coriolis effect
   - northeast monsoon blows from inland areas , wind v dry, brings little rain when winds reach india and bangladesh
   - northeast monsoon brings alot of rain to SG as it passes by south china sea, picking up alot of moisture
   - once it passes equator, wind deflected to the left, moving in northwest direction
   - win warms up as it heads for australia
   - warm air picks up moisture and travels over indian ocean , bringin gheavy rain to auestralia