edu.ucar.opensky::articles:26889 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T19:00:31.105791 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7zc870j https://doi.org/10.6075/J0TX3C9X https Related Dataset #1 Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) Float Data Archive Climatic changes in North Atlantic O2 amplified by temperature sensitivity of phytoplankton growth 2023-12-01T00:00:00Z publication https://n2t.org/ark:/85065/d7zc870j https://doi.org/10.1029/2023GB007930 Margolskee, A. author Ito, T. author Long, Matthew author Deutsch, C. author UCAR/NCAR - Library publisher Ocean warming is associated with a decline in the global oxygen (O-2) inventory, but the ratio of O-2 loss to heat gain is poorly understood. We analyzed historical variability in temperature (T), O-2, and nitrate (NO3- ) in hydrographic observations and model simulations of the North Atlantic, a relatively well-sampled region that is important for deep ocean ventilation. Multidecadal fluctuations of O-2 concentrations in subpolar thermocline waters (100-700 m) are correlated with changes in their heat content, with a slope 35% steeper than that expected from thermal solubility. Variations of O-2 in excess of the solubility effect are correlated with observed decadal changes in NO3- in the surface layer (0-50 m), which declines by similar to 1 mmol N m(-3) per degree of temperature anomaly. Enhanced biologically mediated drawdown of nutrients from the photic zone and associated respiration in deeper water account for the additional depletion of thermocline O-2 during warm years. In model simulations, increased nutrient consumption in warm periods is driven by an early start of the phytoplankton growing season and faster phytoplankton growth rates at higher temperatures. Our results highlight a role for phytoplankton T-dependent growth rates in amplifying ocean O-2 loss. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation