ESReview Guide Midterm 3

ESReview Guide Midterm 3 - Review Guide Midterm 3 Chinas...

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Review Guide Midterm 3 China’s Three Gorges Dam What is the main purpose of the dam? Prevent a future catastrophic flood like the one that occurred in 1998. How is the Three Gorges Dam viewed as a symbol? Viewed as the new “Great Wall of China” What are the human health benefits of the dam? Clean hydroelectric power instead of dirty coal. Name one cultural and physical Impact of the dam. Resettling of thousands of people—loss of river side fishing culture What will river look like with continued glacier retreat? In 50 years, it will decrease by an average of 14 meters—and this glacier serves 1/3 of the population of the world Electromagnetic Radiation (EMR) A recent study shows that low-energy electromagnetic fields, such as areas near power lines have some potential health effects that can cause brain cancer. This non-ionizing radiation was always thought to be harmless. Although there is no conclusive evidence, further research is being sought out. Notes from Lecture 1) The dialogue of the scientific method is three dimensional and ever changing. a. The three basic categories of the scientific method include laws & theories, empirical observations and data, and thematic content 2) Electromagnetic Radiation a. F (frequency)=1/sec or Hertz b. W (wavelength)=meters c. C=Speed of light (3E8 M/SEC) d. C=W*F i. As frequency increases, wavelength decreases
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e. Ionizing radiation has enough power to ionize human skin f. Gamma rays originate from nuclear reactions i. Radioactive material can be detected because they emit gamma rays and can be scanned g. Wavelength Units i. Micron=10^-6 meterss ii. Nanometer=10^-9 meters 3) EMR Energy a. E=EMR Energy (Measured in joules) b. E=h (Planck’s constant 6.6E-34)*F c. Thus, E=h*(C/W) 4) EMR Guidelines a. Wavelength and frequency are inversely proportional b. EMR energy is directly proportional to F or inversely to W c. Ionizing EMR occurs at Wavelengths<visible d. All bodies radiate thermal EMR 5) Remote Sensing Applications a. Because EMR is easily detectable, one can see it from special satellite cameras i. White=Lights ii. Blue=Nighttime fishing iii. Red=Deforestation fires iv. Yellow=Flaring of natural gas The Atmospheric Commons 1) Climate vs. Weather a. Weather is highly variable whereas climate varies much more slowly and is highly predictable because it is dependent on the features of the earth i. Latitude determines the amount of radiation the earth recieves from the sun
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ii. Water is very slow to cool and warm, thus areas near water benefit from their moderating influence 2) Atmosphere a. Atmospheric levels i. Troposphere—Bottommost level 1. Layer in contact with earth’s surface up to 17 KM, makes up the clouds and the rain 2. Also contain isothermal layers which have constant temperature—keeping in all the water vapor in the troposphere 3. The Environment Lapse Rate or the rate at which the temperature is decreasing is -6C/KM ii. Tropopause
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This note was uploaded on 04/02/2009 for the course ENV S 2 taught by Professor Keller during the Winter '09 term at UCSB.

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ESReview Guide Midterm 3 - Review Guide Midterm 3 Chinas...

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