Figure 6. Seasonal wind stress along the California margin from ship reports in the period 1854-1972 (from Huyer, 1983). Darkest shading marks wind stress >1.5 dynes/cm2, whereas intermediate and light shading represents 1.0-1.5, and 0.5-1.0, respectively. Upwelling wind stress (southward vectors parallel to the California margin) varies tremendously by season. Just north of the Leg 167 region at about 45°N, there is little seasonal upwelling; instead, there are short upwelling events. The northern end of the Leg 167 region exhibits the highest seasonality because of movements of the northeast Pacific high.