Open AccessQuasi‐biennial oscillation and tracer distributions in a coupled chemistry‐climate model
Author(s) -
Tian Wenshou,
Chipperfield Martyn P.,
Gray Lesley J.,
Zawodny Joseph M.
Publication year - 2006
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 - 10.1029/2005jd006871
Subject(s) - stratosphere , quasi biennial oscillation , atmospheric sciences , total ozone mapping spectrometer , equator , ozone , environmental science , trace gas , oscillation (cell signaling) , climatology , climate model , latitude , ozone layer , atmospheric chemistry , physics , climate change , meteorology , chemistry , geology , biochemistry , oceanography , astronomy
We have used a fully coupled chemistry‐climate model (CCM), which generates its own wind and temperature quasi‐biennial oscillation (QBO), to study the effect of coupling on the QBO and to examine the QBO signals in stratospheric trace gases, particularly ozone. Radiative coupling of the interactive chemistry to the underlying general circulation model tends to prolong the QBO period and to increase the QBO amplitude in the equatorial zonal wind in the lower and middle stratosphere. The model ozone QBO agrees well with Stratospheric Aerosol and Gas Experiment II and Total Ozone Mapping Spectrometer satellite observations in terms of vertical and latitudinal structure. The model captures the ozone QBO phase change near 28 km over the equator and the column phase change near ±15° latitude. Diagnosis of the model chemical terms shows that variations in NO x are the main chemical driver of the O 3 QBO around 35 km, i.e., above the O 3 phase change.