Influence of tropospheric SO2 emissions on particle formation and the stratospheric humidity

Details Influence of tropospheric SO2 emissions on particle formation and the stratospheric humidity Influence of tropospheric SO2 emissions on particle formation and the stratospheric humidity

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3207810n&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 7, CiteID L07810

Physics

18

Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Evolution Of The Atmosphere (1610, 8125), Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251), Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry

Scientific paper

Stratospheric water vapor plays an important role in the chemistry and radiation budget of the stratosphere. Throughout the last decades stratospheric water vapor levels have increased and several processes have been suggested to contribute to this trend. Here we present a mechanism that would link increasing anthropogenic SO2 emissions in southern and eastern Asia with an increase in stratospheric water. Trajectory studies and model simulations suggest that the SO2 increase results in the formation of more sulfuric acid aerosol particles in the upper tropical troposphere. As a consequence, more ice crystals of smaller size are formed in the tropical tropopause, which are lifted into the stratosphere more readily. Our model calculations suggest that such a mechanism could increase the amount of water that entered the stratosphere in the condensed phase by up to 0.5 ppmv from 1950-2000.

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