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Introduction
Brochure
Science:
Envisat
Data assimilation
Objectives
Links:
ASSET database
Current data
Ozone intercomparison
Partners
Publications
Calendar
Document archive 
Contacts
= ASSET members and
PAG only
 = ASSET members and
PAG; others may request access from the coordinators
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This page contains links to most
code,
data
and plots associated with the
ASSET intercomparison of ozone analyses.
Most of the data is made freely available for
research purposes, though please note that additional restrictions apply to the use
of the ECMWF analyses. Depending on which of the analyses you use,
please cite the appropriate references from the list below, along with Geer et al.
(2006, ACP). See the intercomparison paper for the full details
of these citations.
- ECMWF - Dethof et al. (2003)
- BASCOE - Errera and Fonteyn (2001)
- DARC/Met Office - Geer et al. (2006, QJ)
- KNMI - Eskes et al. (2003) or Segers et al. (2005a)
- Meteo France - Massart et al. (2005)
- MIMOSA - Fierli et al. (2002)
- Juckes - Juckes (2005)
For further information please contact Alan Geer (ageer@met.reading.ac.uk)
or William Lahoz (wal@met.reading.ac.uk)
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The ASSET intercomparison of ozone analyses: method and first
results, 2006: A. J. Geer, W. A. Lahoz, S. Bekki, N. Bormann, Q. Errera, H. J. Eskes, D. Fonteyn, D. R. Jackson, M. N. Juckes, S. Massart, V.-H. Peuch, S. Rharmili, and A. Segers, Atmos. Chem. Phys., 6, 5445-5474.
Abstract and link to PDF
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Plots
Key
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Key to all line figures, also available as a
ps file:
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Analysis fields
Ozonesonde comparisons
HALOE comparisons
MIPAS comparisons
MIPAS calibration - using the analyses as a transfer standard
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Latitude band mean of (MIPAS - analysis) - (HALOE - analysis)
Percentage: Jul: ps
png
Aug: ps
png
Sep: ps
png
Oct: ps
png
Nov: ps
png
Jul-Nov: ps
png
18 Aug - 30 Nov: ps
png
Latitude band mean of (MIPAS - analysis) - (sonde - analysis)
Percentage: Jul: ps
png
Aug: ps
png
Sep: ps
png
Oct: ps
png
Nov: ps
png
Jul-Nov: ps
png
18 Aug - 30 Nov: ps
png
Latitude band mean of (MIPAS - analysis) - (HALOE
(dotted)/sonde(solid) - analysis); BASCOE v3q34 only
Percentage: Jul: ps
png
Aug: ps
png
Sep: ps
png
Oct: ps
png
Nov: ps
png
Jul-Nov: ps
png
18 Aug - 30 Nov: ps
png
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TOMS and total column comparisons
Data
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All data is in NetCDF format. In these files, the parameter "julian_day" contains the date and time in the format used in IDL. This is the time in days since 12UTC, 1st January 4713 B.C, including fractions of days to represent the time precisely. In this representation, 00UTC on 1st January 2000 is given by 2451544.5. Other parameters and units should be self-explanatory from the contents of the NetCDF file.
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Analyses
Independent data
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The original indepdendent data files can be downloaded from the TOMS,
HALOE, SHADOZ, WOUDC and NDSC websites. MIPAS data can be obtained via ESA.
Observational data pre-processed for use in the ASSET intercomparison is available to
ASSET project members, those that contact the ASSET PI and ask for access, but
in the case of MIPAS data, only those who are allowed access via an ESA AO project.
Independent data on original levels:
Ozone sonde: asset_2003.nc
readme file
HALOE: haloe_asset.nc
MIPAS: mipas_asset_o3.nc
Independent data interpolated onto the common pressure levels:
Ozone sonde: sonde_on_clev.nc
HALOE: haloe_on_clev.nc
MIPAS: mipas_on_clev.nc
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Climatology
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Logan (1999) and Fortuin and Kelder (1998) climatologies combined and
meaned in
latitude bands. These are the values used in the calculation of normalised
statistics:
banded_logan_fk_clev.nc
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Code
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All IDL code used in the intercomparison is listed here.
The top-level program is asset_run.pro. In the interpolation of analysis data to the common
grid, and the interpolation of independent data to common levels,
there are dependencies on many data files that are not
supplied on this website. However, all operations on the common-gridded data
should work.
Code directory
Tar file containing all code
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