GC 170A1 1st Edition Lecture 3 Outline of Last Lecture I What is science and how does it operate a Scientific method definition b Scientific method procedure II The Keeling Curve a Dave Keeling i Locations b Results c Graph i Explanation of graph Outline of Current Lecture I Quantifying Global Change a Global Change science II Time Plot Series a Describing a time plot Current Lecture I Group Activity Today a Time Series Plots i Be able to describe a time series plot using these words 1 Mean Trend Variance Periodic Quasi Periodic Random II Quantifying Global Change a Observation Observe natural occurring without trying to change it i Ex Measure CO2 in the atmosphere ii Global Change Science uses observations to understand how the earth works 1 Often through satellites to observe temperature sea level heights atmospheric compositions 2 On earth Temperature CO2 and other gases types of plants abundances rock types 3 Global change processes occur over an huge range of spatial and temporal scales These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute 4 Ex Arctic Sea Ice decrease over the years iii Quantify to make clear the quantity of something to determine express or measure the quantity of something b Experiments Manipulate natural occurring and observe what happens i Ex Measure the CO2 in a room filled with plants III Time Series Plot a Measure of an environmental variable at a given point in time i Description 1 Mean average of x axis values a A mean line is drawn 2 2 Trend lack of increasing or decreasing direction of the mean line 3 3 Variance the height of the values amplitude above or below the mean How high or low the values go above below the mean 4 Periodic perfect fluctuations Up and Down pattern a Wave like pattern 5 Quasi periodic almost regular fluctuations 6 Random no pattern to the fluctuations 7 Rate of change Change in variable change in time a Exponential Rate of Change The change increases instead of behaving linear
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