Immediate and Long‐Lasting Impacts of the Mt. Pinatubo Eruption on Ocean Oxygen and Carbon Inventories

Author:

Fay Amanda R.1ORCID,McKinley Galen A.1ORCID,Lovenduski Nicole S.23ORCID,Eddebbar Yassir4ORCID,Levy Michael N.5ORCID,Long Matthew C.5ORCID,Olivarez Holly C.36ORCID,Rustagi Rea R.1

Affiliation:

1. Lamont‐Doherty Earth Observatory Columbia University Palisades NY USA

2. Department of Atmospheric and Oceanic Sciences University of Colorado Boulder CO USA

3. Institute of Arctic and Alpine Research University of Colorado Boulder CO USA

4. Scripps Institution of Oceanography University of California San Diego La Jolla CA USA

5. Climate and Global Dynamics Laboratory National Center for Atmospheric Research Boulder CO USA

6. Department of Environmental Studies University of Colorado Boulder CO USA

Abstract

AbstractLarge volcanic eruptions drive significant climate perturbations through major anomalies in radiative fluxes and the resulting widespread cooling of the surface and upper ocean. Recent studies suggest that these eruptions also drive important variability in air‐sea carbon and oxygen fluxes. By simulating the Earth system using two initial‐condition large ensembles, with and without the aerosol forcing associated with the Mt. Pinatubo eruption in June 1991, we isolate the impact of this volcanic event on physical and biogeochemical properties of the ocean. The Mt. Pinatubo eruption forced significant anomalies in surface fluxes and the ocean interior inventories of heat, oxygen, and carbon. Pinatubo‐driven changes persist for multiple years in the upper ocean and permanently modify the ocean's heat, oxygen, and carbon inventories. Positive anomalies in oxygen concentrations emerge immediately post‐eruption and penetrate into the deep ocean. In contrast, carbon anomalies intensify in the upper ocean over several years post‐eruption, and are largely confined to the upper 150 m. In the tropics and northern high latitudes, the change in oxygen is dominated by surface cooling and subsequent ventilation to mid‐depths, while the carbon anomaly is associated with solubility changes and eruption‐generated El Niño—Southern Oscillation variability. We do not find significant impact of Pinatubo on oxygen or carbon fluxes in the Southern Ocean; but this may be due to Southern Hemisphere aerosol forcing being underestimated in Community Earth System Model 1 simulations.

Funder

National Science Foundation

Publisher

American Geophysical Union (AGU)

Subject

Atmospheric Science,General Environmental Science,Environmental Chemistry,Global and Planetary Change

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