Evaluation of ozone analyses from UARS MLS assimilation by BASCOE between 1992 and 1997
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Discipline
Earth and related Environmental sciences
Subject
4D-Var assimilation
Antarctic ozone hole
Assimilation system
Chemical species
Chemical transport models
Dynamical fields
Free model
Ground based
Horizontal grid
Lowermost stratosphere
Ozone analysis
Ozone hole
Ozonesondes
Pressure level
Sensitivity tests
Service elements
Stratospheric chemistry
Stratospheric ozone profiles
Atmospherics
Meteorological instruments
Optical radar
Ozone layer
Sulfur compounds
Three dimensional
Upper atmosphere
Value engineering
Ozone
air temperature
atmospheric chemistry
atmospheric pressure
atmospheric transport
data assimilation
ozone
ozonesonde
stratosphere
wind
Audience
Scientific
Date
2010Metadata
Show full item recordDescription
We present the analyses of UARS MLS ozone data obtained by the Belgian Assimilation System for Chemical ObsErvations (BASCOE). This system, based on the 4D-var method, is dedicated to the assimilation of stratospheric chemistry observations. It uses a 3-D Chemical Transport Model (3D-CTM) including 57 chemical species with explicit calculation of stratospheric chemistry. The CTM is driven by ECMWF ERA-40 analyses of winds and temperature, with a horizontal grid of 3.75° in latitude by 5° in longitude, and with 37 pressure levels from the surface to 0.1 hPa. BASCOE has assimilated UARS MLS observations acquired during the period 19921997. We discuss how BASCOE is able to reproduce MLS data, and we evaluate the BASCOE analyses with respect to independent observations from UARS HALOE, ozonesondes, and ground-based lidars. An excellent agreement is found with independent observations (bias usually less than 10%), except in the lowermost stratosphere and in the Antarctic ozone hole. The performances of BASCOE ozone analyses are also compared to those of two other long-term ozone reanalyses; namely, ERA-40 and ERA-Interim, both from ECMWF. Finally, sensitivity test based on BASCOE free model runs suggest that ozone analyses during the ozone hole period would be greatly improved by driving BASCOE with the dynamical fields of the new ECMWF reanalyses ERA-Interim. This work is part of the Stratospheric Ozone Profile Record service raised by the GMES Service Element PROMOTE.
Citation
Viscardy, S.; Errera, Q.; Christophe, Y.; Chabrillat, S.; Lambert, J.-C. (2010). Evaluation of ozone analyses from UARS MLS assimilation by BASCOE between 1992 and 1997. , IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol. 3, Issue 2, 5418830, DOI: 10.1109/JSTARS.2010.2040463.Identifiers
scopus: 2-s2.0-77952680459
Type
Article
Peer-Review
Yes
Language
eng