Asian Monsoon Transport of Pollution to the Stratosphere

William J. Randel, Mijeong Park, Louisa Emmons, Doug Kinnison, Peter Bernath, Kaley A. Walker, Chris Boone, Hugh Pumphrey

Research output: Contribution to journalArticlepeer-review

Abstract

Transport of air from the troposphere to the stratosphere occurs primarily in the tropics, associated with the ascending branch of the Brewer-Dobson circulation. Here, we identify the transport of air masses from the surface, through the Asian monsoon, and deep into the stratosphere, using satellite observations of hydrogen cyanide (HCN), a tropospheric pollutant produced in biomass burning. A key factor in this identification is that HCN has a strong sink from contact with the ocean; much of the air in the tropical upper troposphere is relatively depleted in HCN, and hence, broad tropical upwelling cannot be the main source for the stratosphere. The monsoon circulation provides an effective pathway for pollution from Asia, India, and Indonesia to enter the global stratosphere.

Original languageEnglish
Pages (from-to)611-613
Number of pages3
JournalScience
Volume328
Issue number5978
Early online date25 Mar 2010
DOIs
Publication statusPublished - 30 Apr 2010

Keywords

  • WATER-VAPOR
  • TAPE-RECORDER
  • MODEL
  • HCN
  • BUDGETS
  • CH3CN

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