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Impact of different ozone sounding networks on a 4D-Var stratospheric data assimilation system

Baier, Frank and Erbertseder, Thilo and Schwinger, Jörg and Elbern, Hendrik (2013) Impact of different ozone sounding networks on a 4D-Var stratospheric data assimilation system. Quarterly Journal of the Royal Meteorological Society, 139 (677), pp. 2055-2067. Wiley. doi: [10.1002/qj.2086]. ISSN 0035-9009.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/qj.2086/full


Observing system simulation experiments (OSSEs) are performed to examine the impact of ozonesonde observations on a data assimilation system during a simulated satellite data gap during February 2003. Using the four-dimensional variational chemical data assimilation system SACADA, the relative influence of launch rates and station coverage is investigated. Starting with the VINTERSOL/MATCH campaign, different network and sounding configurations are evaluated. To quantify the performance of assimilation experiments in the lower stratosphere, analysis skill and linear pattern correlation with respect to ERA-Interim reference data are assessed for the 20 km altitude level. Using first-guess and analysis minus observation error statistics, a priori error settings are tuned to optimise the assimilation of simulated and real-world ozone soundings. In summary, it is found that, during satellite data gaps, ozonesonde data can have a significant positive impact on the mean analysis skill depending both on the number of observations and the network layout. A better distributed network based on the GAW system, with 28 stations and three soundings bi-weekly, proves clearly superior to VINTERSOL/MATCH, showing a positive gain in skill of 0.26 compared to a free-running model.

Item URL in elib:https://elib.dlr.de/86731/
Document Type:Article
Title:Impact of different ozone sounding networks on a 4D-Var stratospheric data assimilation system
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Baier, Frankfrank.baier (at) dlr.deUNSPECIFIED
Erbertseder, Thilothilo.erbertseder (at) dlr.deUNSPECIFIED
Schwinger, Jörgjorg.schwinger (at) gfi.uib.noUNSPECIFIED
Elbern, Hendrikhe (at) eurad.uni-koeln.deUNSPECIFIED
Date:2 January 2013
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :[10.1002/qj.2086]
Page Range:pp. 2055-2067
Keywords:data assimilation; polar stratospheric ozone; ozonesondes; satellite data
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Vorhaben Datenprodukte für Klima- und Atmosphärenanwendungen (old)
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center
Deposited By: Baier, Dr.rer.nat. Frank
Deposited On:14 Jan 2014 14:24
Last Modified:17 Jun 2019 11:46

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