24 - EARTH AND PLANETARY SCIENCES 80 Professor Berry...

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EARTH AND PLANETARY SCIENCES 80 Professor Berry 4/21/10 Lecture 24 ASUC Lecture Notes Online is the only authorized note-taking service at UC Berkeley. Do not share, copy or illegally distribute (electronically or otherwise) these notes. Our student-run program depends on your individual subscription for its continued existence. These notes are copyrighted by the University of California and are for your personal use only. D O N O T C O P Y Sharing or copying these notes is illegal and could end note taking for this course. ANNOUNCEMENTS On Monday I will talk about current environmental events. Of course, a week from today, we will have a second midterm covering the second part of the course. What we cover today and on Monday will be on the exam. It will be scantron based and will be similar to the first midterm. Those are the basics. More information is on bSpace. Bring a scantron. The last assignment is the paper with the two questions. They should be easy to answer, based on the last two lectures. The paper can be turned in any time up to our final exam date. There will be a mailbox on the 3 rd floor of McCone labeled EPS 80. I also sent out a bSpace announcement about that. About halfway through the semester, I got a message from some bureaucrat. There aren’t enough rooms for final exams. The final paper will be your final, and there will be no final exam during the final exam period. LECTURE Today, I am going to talk about the oceans. The oceans are about 70 % of the Earth’s surface. I am going to tell you some basic facts about the oceans, basic life in the oceans, and how fisheries are decreasing. Of the water on earth, 95% is salt water, only 5% is fresh water, and 70% of that is ice. We know that the surface waters from about 25-30 degrees north and south of the equator are the warmest in the oceans. The ocean currents move this warm water around the face of the earth. All of the oceans are just one massive body of water that is totally interconnected. The oceans are always in motion. Tides happen twice daily, caused by the gravity pull by the moon and to a lesser degree by the sun. The tides do suck the water back. The tide tables are published, so fishermen rely on tidal action for when they go to fish. There are two types of ocean currents. One is surface current . These make up 10% of all the water. These waters are the upper 400 meters of the ocean, and they are all wind driven. The warm water we just pointed to comes along from the East to the West in the Central Pacific, hits Asia, is deflected and pushed away and then travels north. The cold water is what we have on our shores. This
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24 - EARTH AND PLANETARY SCIENCES 80 Professor Berry...

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