March 4, 2026
The Breath of the Blue: Sanctuary at Risk
Along the rugged California coastline, a silent, powerful phenomenon acts as the heartbeat of our marine ecosystem. Known as coastal upwelling, and it is the engine that drives the incredible biodiversity of our Golden State waters.
Upwelling occurs when strong winds from the north blow along the coastline. Due to the Earth’s rotation (the Coriolis effect), these winds push the warm surface water away from the shore. To fill the gap, cold, nutrient-rich water from the deep ocean rises to the surface.
This deep water is like a concentrated liquid fertilizer. It is packed with nitrates and phosphates that have settled on the seafloor over time. When this “blue gold” hits the sunlight at the surface, it triggers a massive bloom of phytoplankton—the microscopic plants that form the foundation of the entire marine food web.
Impact on Marine Life and Weather
This process transforms our coastal waters into one of the most productive marine environments on Earth. These plankton blooms feed vast swarms of krill and small forage fish like sardines and anchovies, which in turn attract the giants: humpback whales, sea lions, and the apex predators Shark Stewards works so hard to protect.
Beyond the water, upwelling dictates our weather. The interaction between the cold upwelled water and the warm inland air creates California’s iconic coastal fog. This “marine layer” acts as a natural air conditioner, regulating temperatures and providing vital moisture to coastal redwoods.
The Economic Engine of the Ocean
A healthy upwelling system is not just an ecological marvel; it is an economic powerhouse. California’s ocean economy generates tens of billions of dollars annually.
- Commercial & Recreational Fishing: The abundance of life fueled by upwelling supports world-class fisheries. From Dungeness crab to Chinook salmon, the harvest sustains coastal communities and provides food security.
- Recreation and Tourism: Millions of visitors flock to the coast for whale watching, diving, and surfing. These activities support thousands of jobs in hospitality and eco-tourism, proving that a live shark or whale is worth far more to our economy than a harvested one.
- Economic Value -The Greater Farallones National Marine Sanctuary provides significant annual economic value to California and the U.S., including roughly $87.2 million from recreation, 17.5 million from recreational fishing, and $16.3 million from commercial fishing. It supports extensive non-consumptive activities (kayaking, surfing) generating an additional $80 million in income.
Threats to Our Underwater Sanctuaries
While the entire coast benefits from this cycle, certain areas like the Cordell Bank National Marine Sanctuary (NMS) play a significant role in this process. Located offshore of Point Reyes, the bank’s unique topography helps deflect nutrients into the upper water column. While it is one of several protected areas, its contribution to the local biomass is notable. The productivity of this marine ecosystem benefits marine life and productivity downstream into the Greater Farallones National Marine Sanctuary and
However, the integrity of this system is currently at a crossroads. Newly proposed groundfish rules under the National Marine Fisheries Service (NMFS) threaten to damage fragile marine habitat and alter the balance of species within these protected zones. Perhaps more concerning is the shadow of proposed oil exploration offshore. Any seismic testing or drilling activity near the Cordell Bank or the Greater Farallones NMS risks devastating the fragile benthic communities and the migratory paths of the marine megafauna that rely on these upwelling “hotspots.” Oil spills would have a devastating effect on our coastal marine life and ecosystems, and the humans that rely on them.
Take Action with Shark Stewards
The California Current is a masterpiece of nature, but it requires vigilant protection. At Shark Stewards, we believe that understanding the science of our oceans is the first step toward saving them. We are working tirelessly to advocate for stronger sanctuary protections and sustainable fisheries management to ensure the upwelling continues to bring life to our shores.
Help us keep our oceans wild and productive. Join the movement, donate to our conservation efforts, or learn how you can advocate for our National Marine Sanctuaries.
Visit SharkStewards.org to take action today.