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Climate Science

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ITCZ and La Niña Linked to 2025 Panama Upwelling Collapse

The 2025 Panama upwelling failure is attributed to reduced frequency and duration of Panama wind jets — not weaker winds when they blew — tied to ITCZ position during a weak 2024–2025 La Niña, with possible long-term influence from climate-driven ITCZ narrowing.

The 'First Time in 40 Years' Framing for the Panama Upwelling Failure

Calling the 2025 Panama upwelling collapse 'unprecedented' is accurate within the 40-year instrumental record but does not extend to geological timescales — paleoclimate proxies like coral isotopes and sediment cores could in principle test whether similar failures occurred before 1985 but have not been brought to bear in the PNAS paper.

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