TRAJECTORY-MAPPED OZONE DATA PRODUCTS FROM AURA OMI/MLS
This is the documentation for the (truncated) OMI/MLS ozone data
products generated using the trajectory code written by Mark
Schoeberl. The reference for these data products is (please use this
as the official reference in science publications):
Schoeberl, M. R., J. R. Ziemke, B. Bojkov, N. Livesey, B. Duncan,
S. Strahan, L. Froidevaux, S. Kulawik, P. K. Bhartia, S. Chandra,
P. F. Levelt, J. C. Witte, A. M. Thompson, E. Cuevas, A. Redondas,
D. W. Tarasick, J. Davies, G. Bodeker, G. Hansen, B. J. Johnson,
S. J. Oltmans, H. Vomel, M. Allaart, H. Kelder, M. Newchurch,
S. Godin-Beekmann, G. Ancellet, H. Claude, S. B. Andersen, E. Kyro,
M. Parrondos, M. Yela, G. Zablocki, D. Moore, H. Dier, P. von der
Gathen, P. Viatte, R. Stubi, B. Calpini, P. Skrivankova, V. Dorokhov,
H. de Backer, F. J. Schmidlin, G. Coetzee, M. Fujiwara, V. Thouret,
F. Posny, G. Morris, J. Merrill, C. P. Leong, G. Koenig-Langlo, and
E. Joseph, A trajectory-based estimate of the tropospheric ozone
column using the residual method, J. Geophys. Res., 112, D24S49,
doi:10.1029/2007JD008773, 2007.
"Truncation" means that the data files contain only a
small number of the original output data arrays. The file naming
convention is "traj_yymmdd", where yy is year, mm is month, and dd is
day. These are all daily IDL save files. Current coverage is from 1
January 2005 through 30 November 2014 with horizontal binning of 1
degree latitude by 1.25 degree longitude. There are some missing days
due to lack of measurements from either OMI or MLS. OMI ozone (etc.)
measurements were generated using the version 8.5 production
algorithm. MLS ozone measurements were generated using the MLS
version 3.3 algorithm.
Obtaining the daily data files - the entire truncated trajectory
dataset can be obtained via anonymous ftp as follows (total size
is 4.9 Gb):
> ftp jwocky.gsfc.nasa.gov
> Name: anonymous
> Password: (your email address)
> cd pub/ccd/traj
> mget traj_??????
Reading the data in IDL: restore,'traj_??????'
Below is listed the data arrays in each of the IDL save files:
Latitude of grid point in degrees: LATGRID(181)
Longitude of grid point in degrees: LONGRID(288)
OMI above-cloud_column ozone in Dobson Units: OMI_ABOVECLOUD_O3COL(288,181)
OMI below-cloud column ozone in Dobson Units
(from climatology): OMI_BELOWCLOUD_O3COL(288,181)
OMI Radiative Cloud Fraction: OMI_RCF(288,181)
OMI Optical-Centroid-Cloud Pressure (OCCP) in
units hPa: OMI_RCP(288,181)
Stratospheric column ozone from MLS v3.3
in Dobson Units: CO3_MLSI-FINAL(288,181)
OMI/MLS Residual tropospheric column ozone in
Dobson Units: RO3I_FINAL_ADJ(288,181)
OMI/MLS residual tropospheric ozone mean volume
mixing ratio in units parts per million: RO3I_VMR_N2_ADJ(288,181)
Tropopause pressure in units hPa (i.e., mb): TI_FINAL_TROP(288,181)