Abstract: This paper discusses the global analyses of stratospheric ozone (O<sub>3</sub>) and nitrogen dioxide (NO<sub>2</sub>) obtained by the Belgian Assimilation System for Chemical Observations from Envisat (BASCOE). Based on a chemistry transport model (CTM) and the 4-dimensional variational (4D-Var) method, BASCOE has assimilated chemical observations of O<sub>3</sub>, NO<sub>2</sub>, HNO<sub>3</sub>, N<sub>2</sub>O, CH<sub>4</sub> and H<sub>2</sub>O, ma...
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Topics: 
Atmospheric sciences
Meteorology