chapter 19 test Flashcards
where is the greatest air pressure
at sea level
what is the name of the barometer that does not have mercury in it
anaroid barometer
what is the name of the barometer that has mercury in it. How does it work
mercury barometer. air perssure pushed down which makes the mercury go up the tubes so that we can read it in IN or CM
what does pressure indicate about weather
the more pressure the clearer it is and the more pressure the more cloudy and rainy it is
why do people store tennis balls or food in vacuum sealed containers
because they are at a certain pressure. It is so the pressure does not leak
what are the lines on a map called
isobars
what do Ls and Hs mean on maps
the lowest number on the map is for the L and the highest number on the map is for the H
which way does air flow
from high to low
which way does the win go in the southern and northern hemispher and why does it do that
in the northern is goes clockwise and in the southern it goes counterclockwise because of the coriolis effect.
low pressure(cyclone) explaon
low pressure ascending clouds and rain. the air moves up and the temp cools to dew point. and then we get clouds and rain.
why doesn’t air just go straight from high pressure to low pressure areas
because friction and earths rotation affect the winds direction
why is it the hottest at the equator
because the sun shines directly to it but on the poles the suns heat has to spread out. also since the light goes to the poles at an angle it could bounce off but at the equator its mostly absorbed
high pressure(anticyclone) explain
air goes out and clockwise. the temp increases, and the relative humidity decreases and we have clear skies.
what is the efect called that can sometiems cause snow on sunny days
the lake effect. it picks up humidy and then we get snow.
what is another name for the equatorial lows
doldrums
what are doldrums
calm area where warm air rises
what are horse latitueds
calm areas of falling air
what are the prevaiilng westerlies
blow away form the hosre latitudes
what are trade winds
blow away from the horse latitudes towards the equator
what are polar easterlies
they blow cold air away form the poles
what would happen if the earth was not rotating. why does it not do a perfect cycle.
the hot air would rise and go toward the pole and it cools and sinks and then flows along the surface towards the euqator and then does the same thing. Coriolis effect
why are their trade winds
hot air rises and goes to the poles it cools and sinks then air goes out to make trade winds
describe high pressure
goes out and clockwise
describe low pressure
goes in and counterclockwise
what is a polar front
its is when the polar easterlies bump into the prevailng westerlies
where do jet streams hang out
in the tropopause. It is high and the winds are very strong.
what would happen if a jet stream comes down. It goes straight?
it brings the cold. if it goes stright that means it is warm
descibe sea breeze day
the land heats the hot air rises. then the cold air will sink. c
what will happen at land breeze night
the land cools so that the water on teh air rises and cools at the land
how do people name winds
they name them based on where they come from
valley breeze when is happen
it happens in the daytime. the mountains heat up quicker the hot air above the mountain becomes less dense this air sies creating a low pressure.
when mountain breeze happen
at night. it cools faster gets more dense and slides down the mountain
monsoon winds explain summer and winter.
winter: during winter the land is cooler than the ocean this more dense air flows over the land resulting in droughts.
summer: in the summer monsoon the land is warmer because the land warms up quicker than water so air molecules move faster thus less dense air rises, the cool air of the ocean moves onto the land bringing moisture which causes the rainy season
describe el nino
every 3-7 years the warm currents become to strong and replace normally cold offshore water with warm equatorial waters.
describe la nina
when surface temp of the eastern pacific are colder than avg a la nina even is triggered that has a distinct set of weather patterns.
