edu.ucar.opensky::articles:24687 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T23:07:25.921114 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7pn992x https://doi.org/10.5281/zenodo.4716840 https Related Dataset #1 Monthly average air-sea fluxes of O2, CO2, and N2 from Earth System Models An atmospheric constraint on the seasonal air-sea exchange of oxygen and heat in the extratropics 2021-08-01T00:00:00Z publication https://n2t.org/ark:/85065/d7pn992x https://doi.org/10.1029/2021JC017510 Morgan, E. J. author Manizza, M. author Keeling, R. F. author Resplandy, L. author Mikaloff-Fletcher, S. E. author Nevison, C. D. author Jin, Y. author Bent, Jonathan author Aumont, O. author Doney, S. C. author Dunne, J. P. author John, J. author Lima, I. D. author Long, Matthew author Rodgers, K. B. author UCAR/NCAR - Library publisher The air-sea exchange of oxygen (O-2) is driven by changes in solubility, biological activity, and circulation. The total air-sea exchange of O-2 has been shown to be closely related to the air-sea exchange of heat on seasonal timescales, with the ratio of the seasonal flux of O-2 to heat varying with latitude, being higher in the extratropics and lower in the subtropics. This O-2/heat ratio is both a fundamental biogeochemical property of air-sea exchange and a convenient metric for testing earth system models. Current estimates of the O-2/heat flux ratio rely on sparse observations of dissolved O-2, leaving it fairly unconstrained. From a model ensemble we show that the ratio of the seasonal amplitude of two atmospheric tracers, atmospheric potential oxygen (APO) and the argon-to-nitrogen ratio (Ar/O-2), exhibits a close relationship to the O-2/heat ratio of the extratropics (40-70 degrees). The amplitude ratio, A(APO)/A(ArN2), is relatively constant within the extratropics of each hemisphere due to the zonal mixing of the atmosphere. A(APO)/A(ArN2) is not sensitive to atmospheric transport, as most of the observed spatial variability in the seasonal amplitude of delta APO is compensated by similar variations in delta(Ar/N-2). From the relationship between O-2/heat and A(APO)/A(ArN2) in the model ensemble, we determine that the atmospheric observations suggest hemispherically distinct O-2/heat flux ratios of 3.3 +/- 0.3 and 4.7 +/- 0.8 nmol J(-1) between 40 and 70 degrees in the Northern and Southern Hemispheres respectively, providing a useful constraint for O-2 and heat air-sea fluxes in earth system models and observation-based data products. 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 2021 American Geophysical Union. None eng geoscientificInformation