Universität zu Köln

Baier, F., Erbertseder, T., Elbern, H. and Schwinger, J. (2013). Impact of different ozone sounding networks on a 4D-Var stratospheric data assimilation system. Q. J. R. Meteorol. Soc., 139 (677). S. 2055 - 2068. HOBOKEN: WILEY. ISSN 1477-870X

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Abstract

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 Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Baier, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Erbertseder, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Elbern, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schwinger, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-474421
DOI:	10.1002/qj.2086
Journal or Publication Title:	Q. J. R. Meteorol. Soc.
Volume:	139
Number:	677
Page Range:	S. 2055 - 2068
Date:	2013
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1477-870X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CHEMICAL OBSERVATIONS; 3-DIMENSIONAL MODEL; ENVISAT-GOMOS; VALIDATION; TRANSPORT; PROFILES; CONSTITUENTS; SENSITIVITY; VORTEX Multiple languages Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47442