Lecture 10 - EARTH AND PLANETARY SCIENCES 80 Professor...

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EARTH AND PLANETARY SCIENCES 80 Professor Berry 2/24/10 Lecture 10 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 Unfortunately, today’s guest speakers got ill. An hour or so before lecture, I got an email saying that the food staff got ill. I’m going to give the lecture that I was planning on giving next week. Today, a lot of the driving force behind what the Obama administration is doing is climate change. Fundamentally, a number of advisors in the Obama administration are involved in this issue. This is what is driving the whole movement about putting more money in alternative energy. LECTURE A good exam question would be to address how the climate has changed in the past. What is climate? Climate is an average of weather, more specifically temperature and moisture, over a long time, which is more than 2 to 3 weeks. Weather is the daily fluctuations and climate is the average. What makes the climate change? Several factors do so. There are natural factors such as changes in the sun. Changes in the earth’s orbit have a greater impact. We know that the earth is tilted on an axis, and the degree of tilt of the axis varies over time. Another change is the path that the earth makes around the sun, from an ellipse to a sphere. Thirdly, the earth spins on the axis like a top. All three of these factors alter the amount of energy coming from the sun. Clouds also affect climate change, as some clouds absorb the sun and some do not. To add on ice sheets also makes the climate change, because the sun is reflected from the ice sheets and the dark areas absorb the sun more. Volcanic
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Lecture 10 - EARTH AND PLANETARY SCIENCES 80 Professor...

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