Open AccessThree‐dimensional model study of the influence of stratosphere‐troposphere exchange and its distribution on tropospheric chemistry
Author(s) -
Lamarque J.F.,
Hess P. G.,
Tie X. X.
Publication year - 1999
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/1999jd900762
Subject(s) - troposphere , stratosphere , atmospheric sciences , tropospheric ozone , northern hemisphere , environmental science , ozone , climatology , altitude (triangle) , atmospheric chemistry , tropopause , southern hemisphere , meteorology , geology , physics , geometry , mathematics
A three‐dimensional global chemistry transport model is used to examine the impact of stratosphere to troposphere fluxes of ozone (O 3 ) and nitric acid (HNO 3 ) on tropospheric chemistry. The stratospheric fluxes are parameterized as a tropospheric source of O 3 and HNO 3 . The accuracy of the resulting model simulation is compared with measurements. The tropospheric impact of the stratospheric fluxes is examined through a parallel simulation that includes no stratospheric fluxes of O 3 and HNO 3 . Stratosphere‐troposphere exchange (STE) increases the global average tropospheric ozone column by only 11.5%, increasing it in the Northern Hemisphere by 10.5% and in the Southern Hemisphere by 13%. STE shifts the springtime ozone maximum ∼1 month earlier in the Northern Hemisphere. The portion of the O 3 distribution of stratospheric origin in the troposphere increases with altitude, from a maximum of 10–20% in the lower troposphere to 40–50% in the upper troposphere. The sensitivity of the tropospheric response to the spatiotemporal distribution of STE is also examined. On a hemispheric and annual scale the tropospheric composition is particularly sensitive to the temporal distribution of STE. The separate roles of stratospheric fluxes of O 3 and HNO 3 are also identified.