Ucsd cplot 211/6/2022 ![]() ![]() ![]() Set the silicate (X-axis) range from 0 to 140, with an axis increment of 20 and 3 minor ticks between each labeled axis tick, and set the potential temperature (THTA, Y-axis) increment to 5 and 4 minor ticks between each labeled axis tick. This time, experiment with the tick-mark options by clicking on the 'Advanced' tab near the top of the dialog box. Set up a THTA (Y-axis) - SILCAT (X-axis) plot. Now again select 'Property-property.' from the Plots menu. See Figure 10 for a picture of both parts of the dialog box with these selections.Ĭlick 'Plot' in the Property-Property Plot dialog box, and you should see the plot shown in Figure 11. On the Advanced panel you can also adjust the X-axis range to 34 to 37 with an increment of 0.5 and the Y-axis range to 0 to 24 with an increment of 2. Also, because this is a potential temperature versus salinity plot, we can add isopycnals - lines of constant density - to the plot (same holds for a temperature (CTDTMP) versus salinity plot): click on the 'Advanced' tab near the top of the dialog box, and near the bottom of the Advanced panel click on 'Isopycnals', leaving the 'Pressure' slider set to '0' decibars. Select 'Color Legend', which adds the current color bar to the plot, make the marker size '5', and 'Connect observations', which will add a line connecting the observations at the station currently in the Data Window. Set up a potential temperature-salinity plot, by selecting THTA for the Y-axis and SALNTY for the X-axis. Select 'Property-property.' from the 'Plots' menu. No further user actions are required other than clicking 'Plot'. ![]() In Java OceanAtlas we permit you to plot any observed or calculated parameter versus any other, and to color the data points by any color bar which corresponds to a parameter named in the Data Window.Īs noted previously in the Guided Tour, we have configured the dialog boxes for each JOA plot type so that a basic plot can be made with a minimum of user input:įor a JOA property-property (X-Y) plot, the 'Plot' button is activated after at least one parameter is chosen for the X-axis and any one parameter is selected for the Y-axis. Many property-property correlations are of interest to oceanographers. You can visualize which waters along this section would most readily mix, that is, if they were brought together. However, physical oceanographers have a special fondness for temperature versus salinity plots (often as not potential temperature versus salinity plots for the reasons discussed earlier in the Guided Tour), because of the imprinting from the source regions and because isopycnals at appropriate reference pressures can be added to potential temperature versus salinity X-Y plots.įor example, we show in Figure 9 a potential temperature versus salinity plot prepared from a global selection of data (a long section from many cruises extending from the Ross Sea to the Bering Sea in the Pacific Ocean, across the Arctic Ocean and Nordic Seas, and then from Iceland to the Weddell Sea in the Atlantic Ocean), colored by a specially-made color-contour bar with equal divisions of sigma-0 from 22.7 to 27.95.Įach transition of the bands of color in Figure 9 marks an isopycnal. The most basic oceanographic property-property plot is a property plotted against pressure (or depth) as the vertical axis. For example, waters originally from the sea surface in a region of low air temperatures and high precipitation would remain relatively cold and fresh as they spread from their source region, whereas those from the subtropics remained warm and salty due to heating and evaporation there. As the science of oceanography developed in the late 1800s, and as physical/chemical observations became available from widespread regions, it became apparent that ocean waters had imprinted upon them clear and traceable patterns of characteristics. Property-property plots (X-Y plots) are essential to oceanographic data interpretation. ![]()
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