Chemistry Solved_Part_10 - 25-20.46 29-20.9 33-20.5...

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©2010 Digital Interactive Video Education Week 6 29 Has the source of organic carbon for the Mississippi Delta shifted? Hypothesis References: Brian J. Eadie et. al. 1994. Records of Nutrient Enhanced Coastal Ocean Productivity in Sediments from the Louisiana Continental Shelf. Estuaries: Vol. 17, No. 4. www4.nau.edu/cpsil/isotopes.htm “What are stable isotopes?” ftp://ftp.aoml.noaa.gov/pub/ocd/necop/necop91/baldridge91/eadie/edtbox2.dat http://www.ssec.wisc.edu/~gumley/modis_gallery/images/MississippiDelta_20040127_1940_1000m.jpg Methods Materials Equipment: 13 C data from the Mississippi River Delta, Microsoft Excel or similar spreadsheet program. Chemicals: none Procedure Graph the data shown onto the chart on the next page, or better yet, make a graph in Microsoft Excel. The data is available to anyone at the National Oceanic and Atmospheric Administration (NOAA) ftp link listed above. Depth (cm) 13 C 0 -19.8 2 -19.8 5 -20 6 -19.9 9 -20 10 -20.2 12 -20.2 14 -20.3 19 -20.6 20 -20.5
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Unformatted text preview: 25 -20.46 29 -20.9 33 -20.5 35 -20.79 37 -20.54 ©2010 Digital Interactive Video Education 1990 Depth in cm 1900 ∂ 13 C ‰ 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40-19.0-19.2-19.4-19.6-19.8-20.0-20.2-20.4-20.6-20.8-21.0 Results: 1. Describe the pattern that you see. Does it suggest an increase, decrease, or no change in marine organic carbon over time? Record any observations you think are interesting. 2. Using Microsoft Excel or similar program, determine the best regression coefFcient, R 2 , for this data. Week 6 30 del C-13 vs depth R 2 = 0.8809-21-20.8-20.6-20.4-20.2-20-19.8-19.6 10 20 30 40 core depth in cm del C-13 ppt ©2010 Digital Interactive Video Education Discussion: 1. Was your hypothesis correct? Why or why not? 2. List at least three sources of error. 3. Considering the question answered in this experiment, list some similar questions that could be answered by conducting a science experiment. Week 6 31...
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