NASA | Earth’s Oceans Show Decline In Microscopic Plant Life

The video discusses a NASA study revealing a decline in global phytoplankton populations, focusing on diatoms. Diatoms, which contain chlorophyll, form visible blooms and rely on nutrients like nitrate and iron. The study uses satellite data and modeling to analyze changes from 1998 to 2012, noting significant declines in the northern hemisphere due to altered nutrient cycling. The mixed layer's depth affects nutrient availability, influenced by factors like wind and temperature. Further research is needed to determine if these changes are trends or variability.

Explain the significance of nutrient availability for diatoms in the mixed layer of the ocean.

What are some physical forces that can affect the depth of the mixed layer and nutrient availability?