Quantifying pollution transport from the Asian monsoon anticyclone into the lower stratosphere
Pollution transport from the surface to the stratosphere within the Asian monsoon circulation may cause harmful effects on stratospheric chemistry and climate. Here, we investigate air mass transport from the monsoon anticyclone into the stratosphere using a Lagrangian chemistry transport model....
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2017-06-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/17/7055/2017/acp-17-7055-2017.pdf |
| Summary: | Pollution transport from the surface to the stratosphere within the Asian
monsoon circulation may cause harmful effects on stratospheric chemistry and
climate. Here, we investigate air mass transport from the monsoon anticyclone
into the stratosphere using a Lagrangian chemistry transport model. We show
how two main transport pathways from the anticyclone emerge: (i) into the
tropical stratosphere (tropical pipe), and (ii) into the Northern Hemisphere
(NH) extratropical lower stratosphere. Maximum anticyclone air mass fractions
reach around 5 % in the tropical pipe and 15 % in the extratropical
lowermost stratosphere over the course of a year. The anticyclone air mass
fraction correlates well with satellite hydrogen cyanide (HCN) and carbon
monoxide (CO) observations, confirming that pollution is transported deep
into the tropical stratosphere from the Asian monsoon anticyclone.
Cross-tropopause transport occurs in a vertical chimney, but with the
pollutants transported quasi-horizontally along isentropes above the
tropopause into the tropics and NH. |
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| ISSN: | 1680-7316 1680-7324 |