The role of surface vertical mixing in phytoplankton distribution in a stratified reservoir

摘要: We investigated convection caused by surface cooling and mixing attributable to wind shear stress their roles as agents for the transport of phytoplankton cells in water column carrying out two daily surveys during stratified period Sau reservoir. Green algae, diatoms, cryptophyceae were dominant communities carried middle (July) end (September) period. show that a system with linear stratification is subject weak forcing, winds , 4ms 21 low energy dissipation rate values order 10 28 m 2 s 23 or lower, enables formation thin layers. These layers quickly disappear when parcels mix because there medium external forcing (convection) induced night cooling, which characterized rates on ,5 3 1028 m2 s23. During both generated internal waves entire diurnal cycle. day, winds, rise up depth determined solar heating waves. In contrast, mixes down waves, together wind-driven current at surface, seem be responsible horizontal across