Record-breaking Ocean Temperatures Observed in Monterey Bay Amid El Niño
Record-breaking Ocean Temperatures Observed in Monterey Bay Amid El Niño
US · Published Nov 3, 2026
• Scientists at the Monterey Bay Aquarium Research Institute (MBARI) have recorded an unprecedented ocean temperature of 18.18°C (64.72°F) at a depth of 200 feet in Monterey Bay, California, on 26 October
• This temperature surpasses the previous record set during the 1997 El Niño event, marking the highest temperature recorded at this depth in nearly 40 years of monitoring. The warming is attributed to the ongoing 2026-27 El Niño, which has also brought tropical marine species into the region. The data was collected from MBARI’s M1 mooring station, which has been monitoring oceanographic and meteorological conditions since

Impact & Risks

The record-breaking ocean temperatures are already impacting marine ecosystems in Monterey Bay. Tropical species, such as winged comb jellies, rose siphonophores, and juvenile pelagic red crabs, have been observed in the region, indicating a shift in marine biodiversity. These changes could disrupt existing food webs and force cold-water species to migrate to higher latitudes. Additionally, the warming has led to a reduction in phytoplankton biomass, which could affect the availability of marine snow, a critical food source for deep-sea organisms. The long-term ecological consequences of these changes remain uncertain.

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