Comparisons with the GEOS-CHEM Model     

Liu, X., K. Chance, C.E. Sioris, R.J.D. Spurr, T.P. Kurosu, R.V. Martin, M.J. Newchurch, Ozone Profile and Tropospheric Ozone Retrieval from Global Ozone Monitoring Experiment (GOME): Algorithm Description and Validation, J. Geophys. Res., 110(D20), D20307, 10.1029/2005 JD006240, 2005. [Full text (pdf)]

　

Liu X., K. Chance,  C.E. Sioris, T.P. Kurosu, R.J.D. Spurr, R.V. Martin, M. Fu, J.A. Logan, D.J. Jacob, P.I. Palmer, M.J. Newchurch, I. Megretskaia, R. Chatfield, First directly-retrieved global distribution of tropospheric column ozone: comparison with the GOES-CHEM model,  J. Geophys. Res., 111(D2), D02308, 10.1029/2005JD006564, 2006. [Full text (pdf)]

　

　

Figure 1 compares the seasonally-averaged tropospheric column ozone between GOME and the GEOS-CHEM model simulation.  For a close comparison, both are with a hybrid tropopause (NCEP tropopause in the tropics and dynamic tropopause at higher latitudes).  The GEOS-CHEM simulations are sampled in accordance with GOME retrievals and are convolved with GOME retrieval averaging kernels to degrade the GOME resolution.  Finally, both are mapped to 2.5-longitude x 2-latitude horizontal resolution.  We can see that the overall structure is very similar especially in the Southern hemisphere, but there is large discrepancy of ~5-15 DU over northern tropics and subtropics.

　

GOME Tropospheric Ozone

　

GEOS-CHEM Tropospheric Ozone

　

Figure 1 Comparison of seasonal average GOME and GEOS-CHEM (convolved with GOME averaging kernels) tropospheric column ozone from 12/1996 to 11/1997.

　

Figure 2 shows the evaluation of GOME and GEOS-CHEM data with the MOZAIC (1994-2002) measurements at 17 locations, which shows there are good agreement between GOME and MOZAIC at most of the locations and during most of the periods.

　

Figure 9 Comparison of GOME, GOME a priori, GEOS-CHEM, and MOZAIC tropospheric column ozone (TCO) at MOZAIC locations.  GOME TCO for other years or adjacent locations is indicated by ＾´￣.  Error bars show 1s of the monthly means.

　

Last updated on 03/10/2006.