Research Letter

Total volcanic stratospheric aerosol optical depths and implications for global climate change

D. A. Ridley

Corresponding Author

Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

Correspondence to: D. A. Ridley,E-mail address:daridley@mit.edu
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S. Solomon

Department of Earth, Atmospheric, and Planetary Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

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J. E. Barnes

Mauna Loa Observatory, NOAA, Hilo, Hawaii, USA

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V. D. Burlakov

V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk, Russia

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T. Deshler

Department of Atmospheric Sciences, University of Wyoming, Laramie, Wyoming, USA

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S. I. Dolgii

V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk, Russia

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A. B. Herber

Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany

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T. Nagai

Meteorological Research Institute, Tsukuba, Ibaraki, Japan

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R. R. Neely III

Advanced Study Program, National Center for Atmospheric Research, Boulder, Colorado, USA

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A. V. Nevzorov

V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk, Russia

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C. Ritter

Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany

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T. Sakai

Meteorological Research Institute, Tsukuba, Ibaraki, Japan

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B. D. Santer

Program for Climate Model Diagnosis and Intercomparison, Lawrence Livermore National Laboratory, Livermore, California, USA

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M. Sato

The Earth Institute, Columbia University, New York, New York, USA

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A. Schmidt

School of Earth and Environment, University of Leeds, Leeds, UK

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O. Uchino

Meteorological Research Institute, Tsukuba, Ibaraki, Japan

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J. P. Vernier

Science Systems and Applications, Inc., Hampton, Virginia, USA

NASA Langley Research Center, Hampton, Virginia, USA

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First published: 31 October 2014
Cited by: 53

Abstract

Understanding the cooling effect of recent volcanoes is of particular interest in the context of the post‐2000 slowing of the rate of global warming. Satellite observations of aerosol optical depth above 15 km have demonstrated that small‐magnitude volcanic eruptions substantially perturb incoming solar radiation. Here we use lidar, Aerosol Robotic Network, and balloon‐borne observations to provide evidence that currently available satellite databases neglect substantial amounts of volcanic aerosol between the tropopause and 15 km at middle to high latitudes and therefore underestimate total radiative forcing resulting from the recent eruptions. Incorporating these estimates into a simple climate model, we determine the global volcanic aerosol forcing since 2000 to be −0.19 ± 0.09 Wm−2. This translates into an estimated global cooling of 0.05 to 0.12°C. We conclude that recent volcanic events are responsible for more post‐2000 cooling than is implied by satellite databases that neglect volcanic aerosol effects below 15 km.

Number of times cited: 53

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