Recent anthropogenic increases in SO2 from Asia have minimal impact on stratospheric aerosol

  title={Recent anthropogenic increases in SO2 from Asia have minimal impact on stratospheric aerosol},
  author={Ryan R. Neely and Owen Brian Toon and Stanley C. Solomon and J. P. Vernier and Carolina {\'A}lvarez and Jason M. English and Karen H. Rosenlof and Michael J. Mills and Charles G. Bardeen and John Daniel and Jeffrey P. Thayer},
  journal={Geophysical Research Letters},
Observations suggest that the optical depth of the stratospheric aerosol layer between 20 and 30 km has increased 4–10% per year since 2000, which is significant for Earth's climate. Contributions to this increase both from moderate volcanic eruptions and from enhanced coal burning in Asia have been suggested. Current observations are insufficient to attribute the contribution of the different sources. Here we use a global climate model coupled to an aerosol microphysical model to partition the… 

The contribution of anthropogenic SO2 emissions to the Asian tropopause aerosol layer

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MIPAS observations of volcanic sulfate aerosol and sulfur dioxide in the stratosphere

Abstract. Volcanic eruptions can increase the stratospheric sulfur loading by orders of magnitude above the background level and are the most important source of variability in stratospheric sulfur.

The contribution of anthropogenic SO[subscript 2] emissions to the Asian tropopause aerosol layer

Recent observations reveal a seasonally occurring layer of aerosol located from 0◦ to 100◦E, 20◦ to 45◦N and extending vertically from about 13 km to 18 km; this has been termed the Asian tropopause

Stratospheric sulfur and its implications for radiative forcing simulated by the chemistry climate model EMAC

Multiyear simulations with the atmospheric chemistry general circulation model EMAC with a microphysical modal aerosol module at high vertical resolution demonstrate that the sulfur gases COS and

SO2 Observations and Sources in the Western Pacific Tropical Tropopause Region

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Global volcanic aerosol properties derived from emissions, 1990–2014, using CESM1(WACCM)

Accurate representation of global stratospheric aerosols from volcanic and nonvolcanic sulfur emissions is key to understanding the cooling effects and ozone losses that may be linked to volcanic

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Interest in stratospheric aerosol and its role in climate have increased over the last decade due to the observed increase in stratospheric aerosol since 2000 and the potential for changes in the



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Recent optical observations of aerosols in the upper stratosphere and mesosphere show significant amounts of extinction at altitudes above about 40 km where the stratospheric sulfate aerosol layer

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The stratospheric aerosol layer has been monitored with lidars at Mauna Loa Observatory in Hawaii and Boulder in Colorado since 1975 and 2000, respectively. Following the Pinatubo volcanic eruption

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An increase in the amount of aerosols in the stratosphere during the past decade has decreased the rate of global warming, and climate model projections neglecting these changes would continue to overestimate the radiative forcing and global warming in coming decades.

CALIPSO detection of an Asian tropopause aerosol layer

The first four years of the CALIPSO lidar measurements have revealed the existence of an aerosol layer at the tropopause level associated with the Asian monsoon season in June, July and August. This

Improved SAGE II cloud/aerosol categorization and observations of the Asian tropopause aerosol layer: 1989–2005

Abstract. We describe the challenges associated with the interpretation of extinction coefficient measurements by the Stratospheric Aerosol and Gas Experiment (SAGE II) in the presence of clouds. In

Microphysical simulations of large volcanic eruptions: Pinatubo and Toba

Simulations of stratospheric clouds from eruptions ranging in size from the 1991 eruption of Mount Pinatubo to that of Toba 74,000 years ago have been completed using a 3D microphysical sectional

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The monsoon circulation provides an effective pathway for pollution from Asia, India, and Indonesia to enter the global stratosphere, using satellite observations of hydrogen cyanide (HCN), a tropospheric pollutant produced in biomass burning.

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[1] The evolution of the aerosols in the tropical stratosphere since the beginning of the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) mission in June 2006 is

Post-Pinatubo Evolution and Subsequent Trend of the Stratospheric Aerosol Layer Observed by Mid-Latitude Lidars in Both Hemispheres

Lidar observations of the stratospheric aerosol layer have been carried out at Tsukuba and Naha, Japan, and at Lauder, New Zealand. Evolution of the volcanic aerosols originating from the 1991 Mt.

Massive global ozone loss predicted following regional nuclear conflict

We use a chemistry-climate model and new estimates of smoke produced by fires in contemporary cities to calculate the impact on stratospheric ozone of a regional nuclear war between developing