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| BADC Metadata | |
|---|---|
| Data set name | Reading Assimilated Atmospheric Satellite Data |
| Data set location | BADC archive /badc/nerc-assim-prog/data/tropostra/Version_1/ |
| NERC Thematic Programme | Assimilation of Remote-sensed Data for Applications in the Atmospheric and Oceanographic Sciences (ARDAAOS) |
| Project | Assimilation of research satellite data using a general circulation model of the troposphere and stratosphere |
| Principal investigators | Prof Alan O'Neill Dr William Lahoz |
| Data set version | Version 1 |
| Compiled by | Dr Stefano Migliorini |
| Date | 5 March 2002 |
The numerical forecast model which is the basis of the assimilation system
is the HADAM3 version of the stratospheric configuration of the Unified
Model (UM) [Cullen and Davies, 1991].
The tracer advection scheme used for the advection of ozone is a positive
definite scheme based on the flux redistribution method of Roe [1985] with
a superbee limiter [Cullen and Barnes, 1997].
To approximate the atmospheric ozone photochemistry, the Cariolle [Cariolle
and Deque, 1986] ozone photochemistry parameterisation was included in the
UM.
The radiation scheme in the HADAM3 configuration of the UM has been
modified so the ozone used to calculate the radiative forcings are the
assimilated ozone rather than climatology.
The scheme used for the assimilation of the ozone data is the Analysis Correction (AC) method, which is described by Lorenc et al. [1991]. This scheme was used for real time meteorological analysis of the stratosphere at the Met Office from 1991 to 2000 as described by Swinbank and O'Neill [1994]. The analysis is performed by repeated insertion using a modified successive-correction scheme.
UARS MLS profiles of ozone mixing ratios along track (version 4 'level 3AT'
retrieved product) and UARS MLS temperature profiles.
GOME Data Processor (GDP) version 2.7 operational level 2 total ozone
column values, derived at the Deutschen Zentrum für Luft- und
Raumfahrt (DLR).
A full range of operational meteorological observational data was used in
the assimilation in addition to the MLS and GOME observations.
These are National Environmental Satellite Data and Information Service
(NESDIS) temperature retrievals from the NOAA polar orbiters, radiosonde
temperature, winds and relative humidity, aircraft temperature and winds,
geostationary satellite cloud track winds and surface pressure observations.
Ozone mass mixing ration (kg/kg).
Global spatial coverage with lowermost model level at 1000 hPa and
uppermost at 0.316 hPa.
Temporal coverage from 10th April to 30th April 1997.
Arakawa B grid (nx = 96, ny = 73) with 2.5 deg resolution in latitude and
3.75 deg resolution in longitude.
22 levels in the vertical corresponding to UARS vertical levels (approx. 6
UARS levels for every decade of pressure change) with approximately 1.6 km
resolution in the stratosphere.
Six-hourly temporal resolution.
Analyses have been compared against independent observations (UARS HALOE
profiles and TOMS total ozone measurements).
Results:
rms(HALOE - analysis) from 7% to 10% depending on the pressure level (lowest
values are in the stratosphere)
rms(TOMS - vertically integrated analysis) from 5% to 15% depending on
latitude (highest values for latitudes South of 30 deg S, where there is a
bias between GOME and TOMS).
Quoted errors in HALOE and TOMS instruments: 5%.
NetCDF (binary)
83 files, 618 560 bytes each
| o3_qtgsyymmddhh.netcdf | where | yy = 97 | ||
| mm = 04 | ||||
| dd = 10, 11, 12, ..., 29, 30 | ||||
| hh = 00, 06, 12, 18 | ||||
| from | yymmddhh = 97041006 | |||
| to | yymmddhh = 97043018 |
3D ozone mass mixing ratio analysis at a given date and time (UTC).
Date and time coding is given as o3_qtgs_yymmddhh.netcdf.
Example: o3_qtgs_97042812.netcdf is O3 analysis
at 12 on 28 April 1997.
For a complete description of the work see:
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