Researchers assume that geographic barriers, and coastal upwellings, might keep various types of Patiriella regularis from being able to spread or comingle.

During the months of June to September, the warm Southwest monsoon moves the coastal waters northeastward, creating coastal upwelling.

In other areas, HABs are a predictable seasonal occurrence resulting from coastal upwelling, a natural result of the movement of certain ocean currents.

Spatially, the focus is on the California Current region and coastal upwelling in eastern boundary currents.

Northerly winds keep the spring very cool and create a coastal upwelling of deep, cold ocean water.

Increased mixing of the oceans renews silica and other nutrients necessary for diatom growth in surface waters, especially in regions of coastal and oceanic upwelling.

Unlike most other major ocean currents, there is no large-scale coastal upwelling associated with the Leeuwin Current.

This is actually a type of coastal upwelling.

Natural causes include coastal upwelling and changes in wind and water circulation patterns.

Continental margins can consist of organic rich sedimentation, strong coastal upwelling, and pronounced low oxygen zones.