| 1999. Chlorophyll maxima occurred at depths of an inflow of stream water due to a rainstorm at the time of ice off. It is contained between the 5 and 10 oC isotherms. While the increased fluorescence between 2 and 5 m beginning on day 199 appears to be entrainment, in fact it is due to an inflow of stream water due to a second rainstorm. |
| 2000. A. Chlorophyll maxima on July 12 to 13. The thermocline alternately expands and contracts due to motion of a second mode internal wave likely in resonance with the wind. During contraction, high frequency waves with periods of 1 to 5 minutes were generated and high shear occurred at the top of the thermocline and at 8 m depth. This shear may have entrained nutrients from below the chlorophyll maximum and did entrain phytoplanton into the upper mixed layer. |
| 2000. B. Chorophyll maxima from July 12 to 14. The longer time duration more clearly indicates the regular expansion and contraction of the thermocline due to second vertical mode internal wave activity. Due to this movement, phytoplankton that remain in the chlorophyll maximum may alternately exposed to higher irradiances and periodic injection of nutrients. |