Table 1. Results of OSE Studies of the Impact of TES and Combined TES+OMI Ozone Assimilation on the RAQMS Chemical Analysisa


				No Assimilation	TES Assimilation	TES+OMI Assimilation
Column bias (%)			-8.47	-3.46	+0.30
Stratospheric bias (%)		-12.87	-12.17	+0.06
Middle stratosphere bias (%)	-17.63	-17.60	-5.18
Lower stratosphere bias (%)	-4.31	-2.40	+9.51
Tropospheric bias (%)		-5.05	+3.32	+0.49
Upper troposphere bias (%)	-3.65	+2.21	-11.31
Lower troposphere bias (%)	-6.44	+4.42	+12.29

aBiases are determined with respect to August 2006 IONS ozonesonde data. [Thompson et al., 2007, 2008], consisting of more than 370 profiles during TexAQS-II. The accuracy of the sondes in the troposphere is ~5-7% [Smit et al., 2007].