GOL 111: Introductory Oceanography Northern Virginia Community College Dr. Victor P. Zabielski Homework Assignment 1: Water Property Profiles Spring 2014 Name: ____________________ Due: March 18, 2014 Create the following graphs using the data for the equatorial Atlantic site used in the Excel Lab on February 4. If you came to lab that night you should already have these graphs completed. a) temperature vs. depth b) salinity vs. depth c) oxygen vs. depth d) phosphate vs. depth e) salinity vs. temperature The data is available on Blackboard. Please see the posted handout for instructions on how to graph using Excel. The depth axis on all the graphs (except the temperature vs. salinity graph) will be the y-axis with the scale reversed (0 meters at top of page with increasing depth downward on page) to more visually represent the changes in the property with increasing depth in the water column. The T-S diagram is always plotted with temperature on the y-axis and salinity on the x-axis with the left lower corner representing 0°C and 0 ‰. When you are completed with the graphs, answer the question on the following page.Using the graphs that you created answer the following questions: 1) At what depth is temperature the highest? Why? 2) At what depth is temperature the lowest? Why? 3) At what depth is salinity the highest? Why? 4) At what depth is oxygen the lowest? Why? 5) At what depth is oxygen the highest? Why? 6) At what depth is phosphate the lowest? Why? 7) At what depth is phosphate the highest? Why? 8) Is the water column stable (most dense water at bottom, least at top)? How can you tell? 9) How many water masses are present in the water column? What are the salinity and temperature values for each of the individual water masses? Try to identify the source of each water mass (see Figure 7.27 on page 226 of your text, Fig. 8-24, pg 258 of old textbook). Salinity (‰) Temperature (°C) Water Mass/SourceEquatorial Atlantic Latitude (deg) 3.3 N Longitude (deg) 37.5 W Depth (m) Temperature (C) Salinity (‰) Oxygen (O2) (µµµµmol/l) Phosphate (PO4) (µµµµmol/l) 5 26.74 35.88 206 0.03 6 26.747 35.875 193.18 7 26.75 35.875 198.67 10 26.752 35.875 205.08 15 26.752 35.875 211.03 20 26.753 35.875 206.46 25 26.754 35.875 210.58 30 26.755 35.876 209.2 35 26.756 35.875 204.63 40 26.756 35.876 206 41 26.756 35.876 207.37 0.03 45 26.756 35.877 208.75 50 26.756 35.878 210.12 55 26.717 35.904 210.12 60 26.067 36.114 207.83 65 24.789 35.998 202.79 70 22.305 36.101 180.36 75 18.918 35.966 164.8 80 16.475 35.665 160.68 85 14.31 35.413 168 90 13.858 35.392 162.51 95 13.6 35.362 161.59 100 13.197 35.31 156.56 120 12.418 35.193 150.15 125 12.371 35.188 149.69 1.36 140 12.218 35.165 145.57 160 12.087 35.149 146.03 180 11.941 35.132 142.37 200 11.607 35.087 146.95 201 11.602 35.086 146.95 1.49 225 11.47 35.068 150.15 250 11.313 35.049 151.07 275 11.058 35.027 135.96 300 10.764 34.986 138.71 1.61 325 10.35 34.939 143.28 350 10.059 34.903 150.15 375 9.926 34.888 149.69 400 9.725 34.88 141.91 1.74 425 9.083 34.83 135.96 450 8.5 34.77 131.38Pressure (dbars) Temperature (C) Salinity (psu) Oxygen (mmol/l) PO4 (mmol/l) 475 8.173 34.738 131.38 500 7.937 34.739 116.27 525 7.403 34.672 119.02 550 7.301 116.27 575 6.851 34.642 115.36 599 6.542 34.615 117.65 2.3 600 6.532 34.615 117.65 625 6.281 34.598 119.94 650 6.114 34.599 120.39 675 6.023 34.617 118.11 700 5.788 34.6 119.02 2.43 725 5.553 34.594 123.14 750 5.334 34.592 128.63 775 5.12 34.576 133.67 799 5.029 34.576 138.25 2.41 800 5.028 34.576 138.25 850 4.837 34.581 143.28 900 4.698 34.631 149.69 950 4.662 34.652 154.27 1000 4.655 34.68 157.47 2.26 1100 4.655 34.761 168 1200 4.605 34.873 187.69 1.91 1300 4.478 34.924 206.91 1399 4.456 34.96 221.11 1.59 1400 4.455 34.961 221.11 1500 4.296 34.979 234.38 1.45 1600 4.145 34.984 242.16 1.39 1699 4.035 34.985 247.66 1.36 1700 4.034 34.985 247.66 1798 3.886 34.985 253.15 1.33 1800 3.884 34.985 253.15 1900 3.689 34.978 254.98 1999 3.555 34.972 257.73 1.32 2000 3.553 34.972 257.73 2200 3.265 34.959 259.1 2201 3.264 34.959 259.1 1.32 2400 3.065 34.95 259.56 2401 3.065 34.95 259.56 1.35 2500 2.946 34.943 259.1 2600 2.885 34.939 260.02 2700 2.811 34.931 258.19 1.35 2800 2.738 34.925 256.81 2999 2.645 34.919 257.73 1.4 3000 2.645 34.919 257.73 3198 2.571 34.917 262.31 1.38 3200 2.57 34.917 262.31Pressure (dbars) Temperature (C) Salinity (psu) Oxygen (mmol/l) PO4 (mmol/l) 3398 2.5 34.912 264.59 1.37 3400 2.499 34.913 264.59 3549 2.444 34.909 266.43 1.35 3550 2.444 34.909 266.43 1.35 3600 2.432 34.908 266.88 3699 2.387 34.904 267.8 1.35 3800 2.331 34.9 268.26 3850 2.316 34.898 267.8 1.37 3998 2.22 34.885 266.43 1.4 4000 2.207 34.884 266.43 4198 1.817 34.839 256.81 1.63 4399 1.523 34.803 247.66 1.81 4500 1.444 34.793 244.45 1.86 4601 1.411 34.788 243.54 1.88 4602 1.411 34.788