Affiliation:
1. Department of Geosciences Princeton University Princeton NJ USA
2. Atmospheric and Oceanic Sciences Program Princeton University Princeton NJ USA
3. High Meadows Environmental Institute Princeton University Princeton NJ USA
4. LOCEAN‐IPSL CNRS Sorbonne Université Paris France
5. LMD/IPSL ENS Université PSL École Polytechnique Institut Polytechnique de Paris Sorbonne Université CNRS Paris France
Abstract
AbstractObservations suggest that the tropical Pacific Ocean has lost oxygen since the 1960s leading to the expansion of its oxygen minimum zone (OMZ). Attribution to anthropogenic forcing is, however, difficult because of limited data availability and the large natural variability introduced by the Pacific Decadal Oscillation (PDO). Here, we evaluate the PDO influence on oxygen dynamics and OMZ extent using observations and hindcast simulations from two global ocean circulation models (NEMO‐PISCES, MOM6‐COBALT). In both models, the tropical Pacific oxygen content decreases by about 30 Tmol.decade−1 and the OMZ volume expands by 1.3 × 105 km3.decade−1 during PDO positive phases, while variations of similar magnitude but opposite sign are simulated during negative phases. Changes in equatorial advective oxygen supply, partially offset by biological demand, control the oxygen response to PDO. Observations which cover 39% of the tropical Pacific volume only partially capture spatio‐temporal variability, hindering the separation of anthropogenic trend from natural variations.
Publisher
American Geophysical Union (AGU)
Subject
General Earth and Planetary Sciences,Geophysics
Cited by
2 articles.
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