Monthly hydrographic data were obtained at one station for four years at the eastern entrance to the Gulf of California to determine the influence on the pycnocline of waters from river discharge or from the California Current. Data were collected from 2005 to 2009, 20 km offshore over a depth of 127 m on the continental shelf in the vicinity of the Tropic of Cancer. The 4-yr average of the maximum surface temperature was 30.01 °C and the minimum was 21.07 °C, with an absolute minimum of 18.32 °C in January 2008. For salinity, the 4-yr average of the maximum salinity was 35.35 g/kg. Most remarkably, an absolute minimum salinity of 31.08 g/kg was recorded in October 2018 due to freshwater runoff. Waters from the California Current were detected between 35 and 105 m depth from August to September during the four years of observations. Anomalies in sea surface height, with amplitude of centimeters, were associated to pycnocline base oscillations (isotherm of 18 °C) with an amplification factor of 250. The isotherm of 18° was correlated (r = -0.9) to the coefficients of the first empirical mode, which explained 90% of the temperature variance.

每月一次的水文数据是在加利福尼亚湾东入口的一个站点上获得的，为期四年，以确定河流排放或加利福尼亚洋流对水的斜线的影响。数据收集自2005年至2009年，在北回归线附近大陆架深127 m处离岸20公里处。最高表面温度的4年平均值为30.01°C，最低为21.07°C，2008年1月的绝对最小值为18.32°C。对于盐度，最高盐度的4年平均值为35.35 g /公斤。最值得注意的是，由于淡水径流，2018年10月记录的绝对最低盐度为31.08 g / kg。在四年的观测期间，从8月到9月，在加利福尼亚海流的水深被检测到介于35至105 m之间。