Geog 107: Dynamic Earth Day 1…..

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Presentation transcript:

Geog 107: Dynamic Earth Day 1….

The basics! All course material at www.onlinegeographer.com All grades, quizzes, and assignment submissions will be via Canvas. Go over syllabus, in the news, quizzes, labs, grading, etc. Assign in the news 1 and lab 1 Lecture re how to study IFLS

Google Earth Using it all quarter, both in labs and lecture Get started on lab 1 (download, etc). Get all your technical difficulties out of the way this week while I can help. I can’t do anything over the weekend….

What is physical geography? Nothing more than moving energy around. Two sources: Sun Radioactive decay These drive everything that happens on planet earth

Scientific Method (theoretical)

Insolation. Aphelion and perihelion (closest in January) The tilt of the earth. Solstices and equinoxes. These are the three things that determine how much energy any location on the earth’s surface receives from the sun.

A little lat/long.

Effects of latitude (Go over latitude/longitude) Seasons. (tie orbit, tilt, hours of sunlight, angle of sunlight, and temperature together) Summary – the equator gets more energy than the poles. Ma Nature hates inequality. Thus weather (and ocean circulation) is nothing more than energy moving from the equator toward the poles. But.. It’s more complicated… more later. Once we know a bit more about energy transfer.

Energy transfer Radiation Conduction Convection

What happens to all this energy from the sun? Entering atmosphere as radiation. Difference between shortwave and longwave Absorbed, reflected, or scattered

Albedo Fancy word for reflectance Discuss albedo for different earth materials

Water Magical stuff. Truly. High specific heat Required for life Absorbs and transfers incredible amounts of heat both in oceans and atmosphere. continentality

Elevation Warmer or colder? More or less radiation from the sun?

Results in uneven heating of the earth’s surface!!!

A quick look at ocean circulation

Uneven heating – the result is “Air masses” So… large chunks of land/water with similar properties generate air masses. Ie. Ocean near the equator = warm, wet air. High latitudes, middle of continent = warm and dry in summer, cool and dry in winter.

So.. Uneven energy input + air masses We get air masses moving around. Roughly, warmer stuff headed away from equator and cooler stuff moving toward the equator. Energy transfer via primarily Conduction (molecule to molecule) Convection (matter moving about) and Where these air masses bump into each other (or mountains), something happens. Usually precipitation of some sort. And wind. And changes in temperature. Yup, weather!

How this energy is actually transported: A basic convection cell

From here, we digressed a little bit and talked about: Absolute humidity, relative humidity, max humidity, and dew point temperature And how all these things relate.

We moved onto how to get water out of the air. You must cool the air, but how? Answer, force it to rise. Know the relationships between temperature, humidity, and pressure as air is forced to rise. Many diagrams put on the board.