Herbaria macroalgae as a proxy for historical upwelling trends in Central California.

δ 18 O values varied but became slightly more enriched from 1878 to a peak in 1945 followed by a decreasing trend to depleted values from 1963 to 1986 ( figure 3 ). δ 18 O values became more enriched from 1986 to a peak in 2003 and have since become more depleted from 2010 to 2018 ( figure 3 ).

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