meteo 003 section 3 tips for problem sets: get started early, use the wednesday class to work on the...
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METEO 003Section 3
Tips for Problem Sets:
• Get started early, use the Wednesday class to work on the lab assignment and ask questions!
• The mini-lecture on Wednesdays is based on that week’s assignment. Make sure
you come to class.
• Use the office hours to ask for help! The chapters assigned in the book are also a good reference so make sure to read what was assigned.
• Work on the assignment with other people in the class. Just make sure that
what you turn in is your own work!
• Make sure to attempt all the problems! I cannot give partial credit for questions left blank.
Matthew Brothers email: [email protected] hours: Thursday 3:45pm – 4:45pm or by appointmentLocation: 606B Walker
Assignment 1: Due Sept 5• Chapter 1
Problem 1a and b – consult google if you are not sureProblem 4 – pages 8 and 10 in the text are helpful
How to Isopleth
• Isopleth – line of equal value • Uses of isoplething:– See patterns in data– Estimate values where no data is observed
How to Isopleth
• Isopleth – line of equal value • Uses of isoplething:– See patterns in data– Estimate values where no data is observed
• Common isopleths in meteorology:– Isobar: line of equal pressure– Isotherm: line of equal temperature– Isodrosotherm: line of equal dew point
How to Isopleth
1. Pick a value to isopleth first2. Find a location on the map where this value is observed3. Draw a line so locations on one side of your line have
greater value and locations on the other side of the line have a lesser value
4. Stop drawing once you reach an edge of the data or the line closes on itself (circle)
5. Label the isopleth
*Analysis should be neat & smooth, not jagged & messy*Isopleth only the area on the map where data is available
Example
Assignment 1: Due Sept 5• Chapter 1
Problem 1a and b – consult google is you are not sureProblem 4 – pages 8 and 10 in the text are helpfulProblem 7a,b,c – tips1/ Find the multiple of 10, example 30⁰F2/ Look at the numbers around it, and decide which way to proceed3/You want to draw your 30⁰line so that it is closer to 28⁰ than to 34⁰
Gradients
• Gradient of B = Change in Value of B Distance• Isopleths close together = large gradient
• In general, large gradients in weather variables point toward interesting meteorological activity
Assignment 1: Due Sept 5• Chapter 1
Problem 10a, c, d, e Ex: the green line starts at 1000 ft and goes to 4000 ft, over 30 km
So the gradient for the green trail is 100 ft/km
Wind Direction
• EAST WIND = Winds are coming from the EAST and moving WEST
• Easterly Wind = From the East• Eastward Wind = From the West
Assignment 1: Due Sept 5• Chapter 2 – Don’t forget to Convert to Kelvin
Problem 1a, b, c and 6 use Stefan-Boltzmann equation E = σT4
Ex: If sun’s temp is 5538⁰C and your skin is 32⁰C Sun: E = σ *(5811.15 K)4
Person: E = σ*(305.15 K)4
= 131521
So the ratio of the energy emitted per unit area by the sun to the energy emitted per unit area by a person is 131521 to 1
Assignment 1: Due Sept 5• Chapter 2
Problem 2 – Wein’s Law
Ex: If Mars has a surface Temperature of -60⁰C, then the wavelength for maximum emission on Mars is:
= = and λ = 13.59 μm
Assignment 1: Due Sept 5• Chapter 1 - 1a,b, 4, 7a,b,c, 10a,c,d,e• Chapter 2 – 1a,b,c, 2, 6
Useful equations From pg 10 ⁰F = (9/5)⁰C + 32; ⁰C = 5/9(⁰F - 32); ⁰C = K - 273.15
From pg 57, the Stefan-Boltzmann equation E = σT4
From pg 75, Wein’s Law λ =
• Units give numbers meaning, so don’t forget them• Please don’t forget to convert your temperatures to Kelvin