EA_ Sea Ice Trends pg 249

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Oct 30, 2023

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Environmental Analysis #5, pg 249 Sea Ice Trends The National Snow & Ice Data Center monitors sea ice coverage and concentration. The Sea Ice Index is calculated from this coverage to assess the change in sea ice compared with the 30-year average. Data: Sea Ice Trends Activities Go to http://nsidc.org/data/seaice_index . Use the default map parameters of “Monthly” and “Extent” for the Arctic. 1. When did Sea Ice Index data collection start? 2. The “median ice edge” line on the map represents the 30-year median ice extent. Is the current ice cover more than or less than the 30-year median? View the “Northern Hemisphere Extent Anomalies” graph for the most recent month, and click on “I” (information icon) to get more information about the graph. 3. How is the monthly ice extent anomaly calculated? 4. Given the 1981–2010 mean sea ice extent labeled near the bottom of the graph, calculate the current sea ice extent. 5. How does the extent anomaly graph compare with the temperature anomaly graph of Figure 4-34 ? Click on “Animate Monthly Images”. 6. Which month has the lowest sea ice extent? Which month has the greatest sea ice extent? 7. According to the graph, how does the current sea ice extent compare with the 1981–2010 average?

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