In this part we present five figures to show how the model compares with observations. Figures one and four show the position of the available data. In figures 2 and 3 we show time series comparing tidal elevations and tidal currents, while tidal ellipses (their axes) derived from model and observations are compared in figure 5. 34 USA 32 Currentmeter 100 SF 20 Mexico 0 30 BLA 500 28 100 0 GUY 26 Pacific 20 Ocean 00 24 MZT CSL 22 −118 −116 −114 −112 −110 −108 −106 −104 Figure 1. The Gulf of California. Contour lines are the bathymetry in meters. SF, BLA, GUY, CSL, and MZT stand for San Felipe, Bahía de los Ángeles, Guaymas, Cabo San Lucas, and Mazatlán, respectively, where the sea level is shown in Figure 2. The currentmeter position corresponds to the results of Figure 3. San Felipe cm 200 0 −200 Bahia de los Angeles cm 200 0 −200 Guaymas cm 200 0 −200 Cabo San Lucas cm 200 0 −200 700 720 740 760 780 800 820 hrs starting/January/2000 840 860 880 900 Figure 2. Surface elevation in places indicated in Figure 1. Dotted and solid lines are the elevations predicted from the observations and the model, respectively. 29.4oN −113.15oW 110 m, solid model, dotted data 60 (a) u component 40 cm s−1 20 0 −20 −40 −60 0 50 100 150 200 250 300 350 400 450 200 250 300 hrs starting 20/July/1990 350 400 450 60 (b) v component 40 cm s−1 20 0 −20 −40 −60 0 50 100 150 Figure 3. (a) u and (b) v components of velocity in the northern Gulf of California from the model (solid) and the observations (dotted). See figure 1 for the position of the currentmeter in the gulf. Figure 4. (a) The Gulf of California. The upper and lower rectangles are enlarged in (b) and (c) to show the position of the current meter stations. Stations that are too close together for their position to be shown individually are grouped by letters. In (b) AGI and TI stand for Angel de la Guarda and Tiburon islands, respectively. Figure 5. Magnitude of the semimajor axis (cm s-1) for the different tidal constituents. Data and model are shown with ‘+’ and ‘.’, respectively. The horizontal axis labels the position of the different time series along the gulf; the vertical lines separate, from left to right, the northern, island, and southern regions.