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A weak-constraint four-dimensional variational analysis system in the stratosphere
SMHI, Forskningsavdelningen, Meteorologi.ORCID-id: 0000-0003-4870-5459
Vise andre og tillknytning
2009 (engelsk)Inngår i: Quarterly Journal of the Royal Meteorological Society, ISSN 0035-9009, E-ISSN 1477-870X, Vol. 135, nr 640, s. 695-706Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A weak-constraint four-dimensional variational (4D-Var) analysis system designed to correct stratospheric model errors has been evaluated. Verifications against upper-level radiosonde temperature observations and Stratospheric Sounding Unit (SSU) radiance data show that the addition of a weak constraint in the stratosphere call greatly reduce analysis bias. Both single-observation analysis experiments and extended assimilations have been performed to help us understand the impact of the model error covariance specifications required for the weak-constraint formulation. It is found that the use of multivariate balance constraints similar to those implemented in background-error covariances can be problematic. Copyright (C) 2009 Royal Meteorological Society

sted, utgiver, år, opplag, sider
2009. Vol. 135, nr 640, s. 695-706
Emneord [en]
variational data assimilation, weak-constraint 4D-Var, stratospheric model error
HSV kategori
Forskningsprogram
Meteorologi
Identifikatorer
URN: urn:nbn:se:smhi:diva-622DOI: 10.1002/qj.392ISI: 000266552400010OAI: oai:DiVA.org:smhi-622DiVA, id: diva2:807311
Tilgjengelig fra: 2015-04-23 Laget: 2015-04-21 Sist oppdatert: 2017-12-04bibliografisk kontrollert

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