Observed declines in upper ocean phosphate-to-nitrate availability.

Proc Natl Acad Sci U S A · 2025 · PMC11831131 · PMID 39903118

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a negative trendno p-value reported

Fourth, we subtracted interpolated nutrient concentrations from the observations and another monthly climatology [GLODAPv2.2016 ( 59 )] to test whether nutrient detectability improved with time (i.e., a negative trend for concentrations below 1000 m depth).

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