Understand air pressure and its causes, as well as how the pressure of the atmos
ID: 298584 • Letter: U
Question
Understand air pressure and its causes, as well as how the pressure of the atmosphere is measured and standard air pressure at sea level @ 14.7. Understand Corilis effect, and the clockwise or counterclockwise rotation of winds in the northern or southern hemisphere around low or high pressure centers. We did a lab on EINino and LaNina- understand the differences between the two events, the minimal amount of sea surface temperatures involves, and the effects on climate of the two events. Also understand what land and sea breezes are as they occur adjacent to the Great Lakes.Explanation / Answer
The air pressure is a result of the weight of the air molecules above,that make up the various levels of the atmosphere.The air pressures is measured using a barometer .The original instrument had a basin full of mercury and an upside down glass tube.As the pressure increased the pressure would force more mercury in the tube and when pressure decreased the level of mercury in the tube would go down.This is a mercurial barometer.The height of the mercury column is measured in centimeters(or inches).The value for this height at sea level is 76cm of mercury column.
Coriolis effect is the apparent curvature of global winds,ocean currents and everything else that moves freely across the Earth's surface.The curvature is due to rotation of the Earth on it's axis.If not for Earth's rotation,the global winds would blow in straight North South lines,it actually blows diagonally,and so in the northern hemisphere it curves the winds to the right and in the southern hemisphere it curves it to the left.The exceptions are low pressure systems ,in these systems there is a balance between the Coriolis effect and the pressure gradient force and the wind flows in reverse.
El Niño is the warm phase of the El Niño southern oscillation(ENSO) and is associated with a band of warm ocean waters that develops in the central and the east central equatorial Pacific including the west coast of South America.
ENSO refers to the cycle of warm and cold temperatures as measured by sea surface temperatures.
The cool phase of ENSO is termed as La Nina with sea surface temperatures in the eastern Pacific below average and air pressures high in eastern and low in the western Pacific.
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