Observations of the eruption of the Sarychev volcano and simulations using the HadGEM2 climate model.

[1] In June 2009 the Sarychev volcano located in the Kuril Islands to the northeast of Japan erupted explosively, injecting ash and an estimated 1.2 ± 0.2 Tg of sulfur dioxide into the upper troposphere and lower stratosphere, making it arguably one of the 10 largest stratospheric injections in the last 50 years. During the period immediately after the eruption, we show that the sulfur dioxide (SO2) cloud was clearly detected by retrievals developed for the Infrared Atmospheric Sounding Interferometer (IASI) satellite instrument and that the resultant stratospheric sulfate aerosol was detected by the Optical Spectrograph and Infrared Imaging System (OSIRIS) limb sounder and CALIPSO lidar. Additional surface-based instrumentation allows assessment of the impact of the eruption on the stratospheric aerosol optical depth. We use a nudged version of the HadGEM2 climate model to investigate how well this state-of-the-science climate model can replicate the distributions of SO2 and sulfate aerosol. The model simulations and OSIRIS measurements suggest that in the Northern Hemisphere the stratospheric aerosol optical depth was enhanced by around a factor of 3 (0.01 at 550 nm), with resultant impacts upon the radiation budget. The simulations indicate that, in the Northern Hemisphere for July 2009, the magnitude of the mean radiative impact from the volcanic aerosols is more than 60% of the direct radiative forcing of all anthropogenic aerosols put together. While the cooling induced by the eruption will likely not be detectable in the observational record, the combination of modeling and measurements would provide an ideal framework for simulating future larger volcanic eruptions.

[1]  A. Bourassa,et al.  Stratospheric aerosol retrieval with optical spectrograph and infrared imaging system limb scatter measurements , 2007 .

[2]  J. Hansen,et al.  GLOBAL SURFACE TEMPERATURE CHANGE , 2010 .

[3]  R. Stothers.  Stratospheric aerosol clouds due to very large volcanic eruptions of the early twentieth century: Effective particle sizes and conversion from pyrheliometric to visual optical depth , 1997 .

[4]  Simon A. Carn,et al.  Long range transport and fate of a stratospheric volcanic cloud from Soufriere Hills volcano, Montserrat , 2007 .

[5]  Olivier Boucher,et al.  A comparison of the climate impacts of geoengineering by stratospheric SO2 injection and by brightening of marine stratocumulus cloud , 2011 .

[6]  David M. Winker,et al.  CALIPSO observations of stratospheric aerosols: a preliminary assessment , 2007 .

[7]  R. Quentin Grafton,et al.  global surface temperature , 2012 .

[8]  Eric P. Shettle,et al.  Atmospheric Aerosols: Global Climatology and Radiative Characteristics , 1991 .

[9]  Lieven Clarisse,et al.  Retrieving radius, concentration, optical depth, and mass of different types of aerosols from high-resolution infrared nadir spectra. , 2010, Applied optics.

[10]  Charles S. Zender,et al.  A monthly and latitudinally varying volcanic forcing dataset in simulations of 20th century climate , 2003 .

[11]  B. Kravitz,et al.  Negligible climatic effects from the 2008 Okmok and Kasatochi volcanic eruptions , 2010 .

[12]  A. Robock.  Volcanoes and Climate , 1989 .

[13]  H. Jäger,et al.  Correction to “Lidar backscatter to extinction, mass and area conversions for stratospheric aerosols based on midlatitude balloonborne size distribution measurements” , 2003 .

[14]  Anthony J. Baran,et al.  New application of the operational sounder HIRS in determining a climatology of sulphuric acid aerosol from the Pinatubo eruption , 1994 .

[15]  J. Haywood,et al.  The effect of anthropogenic sulfate and soot aerosol on the clear sky planetary radiation budget , 1995 .

[16]  Andrew S. Jones,et al.  Indirect sulphate aerosol forcing in a climate model with an interactive sulphur cycle , 2001 .

[17]  Arlin J. Krueger,et al.  Global tracking of the SO2 clouds from the June , 1992 .

[18]  Michael Schulz,et al.  Radiative forcing by aerosols as derived from the AeroCom present-day and pre-industrial simulations , 2006 .

[19]  Georgiy L. Stenchikov,et al.  Regional climate responses to geoengineering with tropical and Arctic SO2 injections , 2008 .

[20]  R. Stothers.  A Chronology of Annual-Mean Effective Radii of Stratospheric Aerosols from Volcanic Eruptions During the Twentieth Century as Derived From Ground-based Spectral Extinction Measurements , 2001 .

[21]  Hermann Oelhaf,et al.  Optical and microphysical parameters of the Mt. Pinatubo aerosol as determined from MIPAS-B mid-IR limb emission spectra , 1998 .

[22]  Olaf Morgenstern,et al.  Technical Note: Description and assessment of a nudged version of the new dynamics Unified Model , 2007 .

[23]  Kevin Hamilton,et al.  Arctic oscillation response to the 1991 Pinatubo eruption in the SKYHI general circulation model with a realistic quasi-biennial oscillation , 2004 .

[24]  Lieven Clarisse,et al.  Monitoring of atmospheric composition using the thermal infrared IASI/METOP sounder , 2009 .

[25]  P. Rasch,et al.  An overview of geoengineering of climate using stratospheric sulphate aerosols , 2008, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[26]  Lieven Clarisse,et al.  Tracking and quantifying volcanic SO 2 with IASI, the September 2007 eruption at Jebel at Tair , 2008 .

[27]  Klaus-Peter Heue,et al.  Influence of the 2008 Kasatochi volcanic eruption on sulfurous and carbonaceous aerosol constituents in the lower stratosphere , 2009 .

[28]  A. Prata,et al.  Ash and sulfur dioxide in the 2008 eruptions of Okmok and Kasatochi: Insights from high spectral resolution satellite measurements , 2010 .

[29]  A. Slingo,et al.  General Circulation Model Calculations of the Direct Radiative Forcing by Anthropogenic Sulfate and Fossil-Fuel Soot Aerosol , 1997 .

[30]  T. Eck,et al.  Variability of Absorption and Optical Properties of Key Aerosol Types Observed in Worldwide Locations , 2002 .

[31]  Kai Yang,et al.  Band residual difference algorithm for retrieval of SO/sub 2/ from the aura ozone monitoring instrument (OMI) , 2006, IEEE Transactions on Geoscience and Remote Sensing.

[32]  Lieven Clarisse,et al.  Detection of volcanic SO2, ash, and H2SO4 using the Infrared Atmospheric Sounding Interferometer (IASI) , 2010 .

[33]  A. Krueger,et al.  Stratospheric Loading of Sulfur From Explosive Volcanic Eruptions , 1997, The Journal of Geology.

[34]  Andreas Stohl,et al.  Lidar observations of Kasatochi volcano aerosols in the troposphere and stratosphere , 2010 .

[35]  A. Smirnov,et al.  AERONET-a federated instrument network and data archive for aerosol Characterization , 1998 .

[36]  Adam E. Bourassa,et al.  Evolution of the stratospheric aerosol enhancement following the eruptions of Okmok and Kasatochi: Odin‐OSIRIS measurements , 2010 .

[37]  H. Jäger,et al.  Lidar backscatter to extinction, mass and area conversions for stratospheric aerosols based on midlatitude balloonborne size distribution measurements , 2002 .

[38]  A. Staniforth,et al.  Semi-Lagrangian integration schemes for atmospheric models - A review , 1991 .

[39]  D. Winker,et al.  Initial performance assessment of CALIOP , 2007 .

[40]  Sundar A. Christopher,et al.  Updated estimate of aerosol direct radiative forcing from satellite observations and comparison against the Hadley Centre climate model , 2008 .

[41]  A. Robock.  Volcanic eruptions and climate , 2000 .

[42]  John E. Barnes,et al.  Increase in background stratospheric aerosol observed with lidar at Mauna Loa Observatory and Boulder, Colorado , 2009 .

[43]  Roland Neuber,et al.  Lidar measurements of the Kasatochi aerosol plume in August and September 2008 in Ny‐Ålesund, Spitsbergen , 2010 .

[44]  P. Pilewskie,et al.  Pinatubo and pre‐Pinatubo optical‐depth spectra: Mauna Loa measurements, comparisons, inferred particle size distributions, radiative effects, and relationship to lidar data , 1993 .

[45]  D. Weisenstein,et al.  SPARC Assessment of Stratospheric Aerosol Particles , 2006 .

[46]  E. J. Llewellyn,et al.  The OSIRIS instrument on the Odin spacecraft , 2004 .

[47]  K. Carslaw,et al.  Stratospheric Aerosol Processes , 2006 .

[48]  J. Liley,et al.  Thirty years of in situ stratospheric aerosol size distribution measurements from Laramie, Wyoming (41°N), using balloon‐borne instruments , 2003 .

[49]  R. Tubbs,et al.  Forecasting Research and Development , 2010 .

[50]  I. Tang.  Chemical and size effects of hygroscopic aerosols on light scattering coefficients , 1996 .

[51]  J. Haywood,et al.  Multi‐spectral calculations of the direct radiative forcing of tropospheric sulphate and soot aerosols using a column model , 1997 .

[52]  E. J. Llewellyn,et al.  Retrieval of stratospheric aerosol size information from OSIRIS limb scattered sunlight spectra , 2008 .

[53]  O. Boucher,et al.  Geoengineering by stratospheric SO 2 injection: results from the Met Office HadGEM2 climate model and comparison with the Goddard Institute for Space Studies ModelE , 2010 .

[54]  Arlin J. Krueger,et al.  Retrieval of large volcanic SO2 columns from the Aura Ozone Monitoring Instrument: Comparison and limitations , 2007 .

[55]  J. Hansen,et al.  Stratospheric aerosol optical depths, 1850–1990 , 1993 .

[56]  D. Hofmann,et al.  Lidar measurements of stratospheric aerosol over Mauna Loa Observatory , 1997 .

[57]  A. Robock,et al.  Climatic response to high‐latitude volcanic eruptions , 2005 .

[58]  P. Braesicke,et al.  Reassessment of causes of ozone column variability following the eruption of Mount Pinatubo using a nudged CCM , 2009 .

[59]  Diego G. Loyola,et al.  Satellite Monitoring of Volcanic Sulfur Dioxide Emissions for Early Warning of Volcanic Hazards , 2009, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

[60]  H. Lamb,et al.  Volcanic dust in the atmosphere; with a chronology and assessment of its meteorological significance , 1970, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[61]  S. Self,et al.  The volcanic explosivity index (VEI) an estimate of explosive magnitude for historical volcanism , 1982 .