By Andrew Freedman, CNN
(CNN) — Something unusual and with far-reaching consequences is lurking in the sea off the California coast, stretching all the way down the Baja Peninsula and more than 500 miles to the southwest.
In this broad region, a large, long-lasting and record-setting marine heat wave has set in and is forecast to persist and intensify, altering the weather conditions on the West Coast and adversely affecting the marine food chain.
This heat wave, which is the oceanic equivalent of a heat wave on land, could have broad ramifications for sea life, as warm water species like hammerhead sharks and bluefin tuna migrate into areas where they are normally not seen, and cold-water species move deeper and further north.
The marine heat wave may have widespread impacts on the weather in the West, making off-the-chart heatwaves like March’s more likely and intense, supercharging rainfall and even allowing tropical systems to come northward into California.
Scientists at Scripps Institution of Oceanography are monitoring ocean temperatures along the California coast, where their records stretch back more than a century. They have been recording one hot ocean record after another, especially during the past few weeks.
Since January 1 and through the end of last week, there were 36 days when sea surface temperatures at Scripps Pier in La Jolla, California set records for the hottest water temperature ever recorded on that date. This is significant, since daily data at that location goes all the way back to 1916.
Scripps’ scientists are using robotic ocean-going vehicles to investigate water temperatures below the sea surface. They have found that the unusually hot waters extend to deep depths and are comparable to conditions typically seen when a significant El Niño has taken hold.
El Niño features unusually hot ocean waters near the equator in the Pacific Ocean, along with significant changes to global weather patterns and the planet’s climate.
However, while a potentially strong El Niño is predicted to develop by the end of the summer to early fall, there is not one present right now. This warns of just how much hotter water temperatures could get in this region during the coming weeks and months.
According to Dillon Amaya, a research scientist at the National Oceanic and Atmospheric Administration, a climate cycle that is a precursor to El Niño now joins the distinct California marine heat wave with a far bigger area of unusually hot ocean waters that extends all the way to Indonesia. (The climate cycle is known as the Pacific Meridional Mode.)
Together, these two entities comprise one of the biggest marine heat waves on Earth right now.
Computer model projections show this broad hotter-than-average region morphing into an El Niño along the equator over time, while the smaller, closer-in marine heat wave continues to bake the waters off the California coast, potentially even into the fall and winter months, Amaya said.
The California marine heat wave is already having an impact on the Pacific Ocean’s food web. Tammy Russell, a marine ornithologist at Scripps, said that seabirds in particular are being impacted, which is a warning sign about more serious impacts to come for other species as well. Russell studies seabirds closely, and how they interact with the broader marine ecosystem.
“We have been seeing an increase in the number of seabirds coming into rehabilitation facilities and washing up dead on the beaches across southern and central California for a few months now,” she said in a statement. “Most of the birds are emaciated and have tested negative for HPAI (av