GC 170A1 1st Edition Lecture 3Outline of Last Lecture I. What is science and how does it operate?a. Scientific method definitionb. Scientific method procedureII. The Keeling Curvea. Dave Keelingi. Locationsb. Resultsc. Graphi. Explanation of graphOutline of Current Lecture I. Quantifying Global Changea. Global Change scienceII. Time Plot Seriesa. Describing a time plot Current LectureI. Group Activity Todaya. Time Series Plotsi. Be able to describe a time series plot using these words1. Mean, Trend, Variance, Periodic, Quasi Periodic, RandomII. Quantifying Global Changea. Observation: Observe natural occurring without trying to change iti. Ex: Measure CO2 in the atmosphereii. Global Change Science uses observations to understand how the earth works1. Often through satellites (to observe temperature, sea level heights, atmospheric compositions)2. On earth: Temperature, CO2 and other gases, types of plants (abundances), rock types3. 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 yearsiii. Quantify= to make clear the quantity of something; to determine, express, or measure the quantity of somethingb. Experiments: Manipulate natural occurring and observe what happensi. Ex: Measure the CO2 in a room filled with plantsIII. Time Series Plota. Measure of an environmental variable at a given point in time i. Description1. Mean = average of x axis values a. A mean line is drawn 2. 2) Trend = lack of, increasing or decreasing direction of the mean line3. 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 pattern5. Quasi-periodic = almost regular fluctuations 6. Random = no pattern to the fluctuations7. Rate of change: Change in variable/change in time a. Exponential Rate of Change (The change increases instead of behaving
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