Limited time offer 20% OFF StudySoup Subscription details

ECU - AS 1300 - Class Notes - Week 9

Created by: Rachel Notetaker Elite Notetaker

ECU - AS 1300 - Class Notes - Week 9

0 5 3 35 Reviews
This preview shows pages 1 - 2 of a 6 page document. to view the rest of the content
background image Pressure & Wind: Forces on the Atmosphere Newton’s First Law of Motion o “A force is required to make something move”  Pressure- force exerted per unit area due to the weight of the air 
(units of pressure = millibars mb)
o Ex: more water in tank A = more pressure than tank B which has  less water If both tanks were connected the water would travel from 
the higher pressure tank to the lower tank by net force
1.Pressure gradient force- source of all wind Pressure gradient = difference in pressure/distance between points o Wind blows high to low and increases with a larger pressure  gradient o Larger pressure gradient the faster the wind will blow
o On a weather map, pressure gradient is larger where isobars are 
closer together o Vertical pressure gradient force is balanced by gravity
o Faster wind where pressure gradient is larger
       To change the air pressure, change the temperature Warm air – low density (expands/rises)
Cold air – high density (contracts/sinks)
Higher pressure: o Colder air
o Dry (clear skies)
o Dense
Low pressure o warmer air
o humid (clouds)
o less dense “taller”
2.Coriolis Force – air moves in the reference frame of the earth
depends on:
o Earth’s rotation
o Speed of object
o Latitude of object
*the atmosphere is not in a “fixed” frame of reference Pressure & Wind: Forces on the Atmosphere cont. *Isobars represent the air pressure on weather maps
background image Remember: 1. Pressure Gradient Force: H-L
2. Coriolis Force: is effected by the earth’s rotation
Increases with   o earth’s rotation
o faster speed of object
o higher latitude of object
o strongest at the poles, zero at the equator
o all moving objects are deflected by the Coriolis force
o is noticeable for objects that are in motion for a significant 
amount of time it takes for the earth to rotate once o ex: Colorado sized area in the northern hemisphere Pressure gradient force moves air high to low Once air moves Coriolis force takes effect Curves to the right and increases as air speeds up The pressure gradient force and Coriolis force 
become equal and point in opposite positions = air 
moves in straight path at constant speed
Geostrophic wind balance- pressure gradient force = Coriolis force 
(become equal and opposite)
o Also called a Jet stream- low pressure to the left of the motion & high pressure to the right 3. Friction (near the surface this force is also acting) o Slows the wind near the earth’s surface as air collides with trees,  hills, buildings, etc.  o Friction weakens the Coriolis force Low pressure systems spin: o Counterclockwise in northern hemisphere
Clockwise in the southern hemisphere
Extratropical Cyclones: Air masses, fronts, and their weather Convergence – air pushed together and piling up o Clouds and rain near a low (“Cyclone”) Divergence- air spread outward and sinking down o Clear and nice near a high (“anti-cyclone”) Air masses and fronts Air mass- large scale region of air (size of half the US) with similar 
characteristics
Temperature (Tropical vs Polar)
Humidity (maritime (humid and moist) vs continental (dry)) 
cP- continental polar mT- maritime tropical Front – boundary between air masses

This is the end of the preview. Please to view the rest of the content
Join more than 18,000+ college students at East Carolina University who use StudySoup to get ahead
School: East Carolina University
Department: Atmosphere Sciences
Course: Weather and Climate
Professor: Thomas Rickenbach
Term: Fall 2015
Tags: air, pressure, Fronts, weather, and maps
Name: ATMO/GEOG 1300: Weather & Climate
Description: These notes cover both topics discussed during week 8 and week 9 which covered weather fronts, air pressure, and understanding weather maps
Uploaded: 10/20/2017
6 Pages 45 Views 36 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
Join StudySoup for FREE
Get Full Access to ECU - ATMO 1300 - Class Notes - Week 9
Join with Email
Already have an account? Login here
×
Log in to StudySoup
Get Full Access to ECU - ATMO 1300 - Class Notes - Week 9

Forgot password? Reset password here

Reset your password

I don't want to reset my password

Need help? Contact support

Need an Account? Is not associated with an account
Sign up
We're here to help

Having trouble accessing your account? Let us help you, contact support at +1(510) 944-1054 or support@studysoup.com

Got it, thanks!
Password Reset Request Sent An email has been sent to the email address associated to your account. Follow the link in the email to reset your password. If you're having trouble finding our email please check your spam folder
Got it, thanks!
Already have an Account? Is already in use
Log in
Incorrect Password The password used to log in with this account is incorrect
Try Again

Forgot password? Reset it here