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Step 1 - Students will download from the web data for a recent hurricane that moved across the Gulf of Mexico (e.g. Katrina) and create a Sea Surface Height (SSH) map of the Gulf at that time using the Colorado Center for Astrodynamics Research. (Note: all links are provided in the "Other Materials" section below). They will plot the positions of the hurricane on the map and add wind speed and atmospheric pressure. They will then analyze the data and discuss the relationship between hurricane intensity and surface temperatures (in the Gulf of Mexico SSH is a good proxy for temperatures). Step 2 â Formulate a hypothesis on how the global warming of the last century may have affected hurricane intensity. Step 3 â Test the hypothesis. Download from the web and plot on an XY graph data on SST, hurricane intensities and frequency changes in the tropical Atlantic between 1950 and today; identify and discuss similarities and differences. Is there any evidence of a common trend? Download from the web and plot on an XY graph the number of landfalls before and after 1950, compare the data to SSTs and discuss if and how this information support previous conclusions. Extend the SST and frequency curves back to the 1800s, verify if the pattern(s) previously identified persist (s). Search the web to learn how data were collected before the 1960s, and discuss the reliability of historical data vs. instrumental data. Step 4 â Consideration of indirect effects of global warming on hurricane damage â the case of higher sea level. Using Google Earth students will analyze how the combination of increased sea level due to a warmer climate and hurricane-induced storm surges will increase the risk of extensive flooding along coastal regions.
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