| 1. Identificação | ||||
| Tipo de Referência | Artigo em Evento (Conference Proceedings) | |||
| Site | mtc-m21c.sid.inpe.br | |||
| Código do Detentor | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S | |||
| Identificador | 8JMKD3MGP3W34R/3RD33LP | |||
| Repositório | sid.inpe.br/mtc-m21c/2018/07.02.16.02 | |||
| Repositório de Metadados | sid.inpe.br/mtc-m21c/2018/07.02.16.02.51 | |||
| Última Atualização dos Metadados | 2021:09.16.03.43.59 (UTC) administrator | |||
| Chave Secundária | INPE--PRE/ | |||
| Chave de Citação | DinizTodl:2018:CoAdEn | |||
| Título | Comparing the adjoint- and ensemble-based approaches to observation impact on short-range forecasts  | |||
| Ano | 2018 | |||
| Data de Acesso | 11 maio 2024 | |||
| Tipo Secundário | PRE CI | |||
| 2. Contextualização | ||||
| Autor | 1 Diniz, Fábio Luiz Rodrigues 2 Todling, R. | |||
| Grupo | 1 MET-MET-SESPG-INPE-MCTIC-GOV-BR | |||
| Afiliação | 1 Instituto Nacional de Pesquisas Espaciais (INPE) 2 NASA | |||
| Endereço de e-Mail do Autor | 1 fabio.diniz@cptec.inpe.br | |||
| Nome do Evento | Workshop on Sensitivity Analysis and Data Assimilation in Meteorology and Oceanography | |||
| Localização do Evento | Aveiro, Portugal | |||
| Data | 01-06 july | |||
| Histórico (UTC) | 2018-07-02 16:03:03 :: simone -> administrator :: 2018 2020-12-07 21:11:55 :: administrator -> simone :: 2018 2021-03-02 14:34:29 :: simone -> administrator :: 2018 2021-09-16 03:43:59 :: administrator -> simone :: 2018 | |||
| 3. Conteúdo e estrutura | ||||
| É a matriz ou uma cópia? | é a matriz | |||
| Estágio do Conteúdo | concluido | |||
| Transferível | 1 | |||
| Resumo | GMAO is one of the few Centers around the world that has been evaluating observation impact on the twenty-four hour forecasts using an adjoint-based approach for many years. This is implemented within its near-real time GEOS data assimilation system (DAS) which involves the adjoint of the GEOS general circulation model (GCM), responsible for calculating forecast sensitivities, and the adjoint of the Grid-point Statistical Interpolation (GSI) analysis, responsible for calculating analysis sensitivities. The GMAO implementation of the adjoint-based observation impact dates back to the times when GEOS DAS was still running 3dVar. More recently, the GEOS assimilation approach has evolved, first into ensemble hybrid 3dVar, and as of January 2017 into hybrid 4dEnVar. These ensemble hybrid systems rely on a reduced-resolution ensemble running in parallel with the high-resolution hybrid analysis, and combine an ensemble of GEOS GCM integrations with the Ensemble Square-Root Filter (EnSRF) analysis. The adjoint-based observation impact tool is automatically available in systems implementing traditional or hybrid, 3D or 4D, variational methods. Many hybrid data assimilation systems currently used at NWP centers do not have an adjoint of the underlying GCM, thus lacking the ability to evaluate observation impact through traditional adjoint-based methods. In such systems, an argument can be made for deriving observation impacts on forecasts using an ensemble-based approach instead. Unfortunately, typical hybrid systems use ensembles that operate at different resolution than the deterministic forecasting model which result in degraded forecast quality when compared to the central high-resolution forecasts. Worse still is the fact that in many hybrid systems, the ensemble analysis handles the observing system in substantially different ways than the way the hybrid, deterministic, analysis does. This particular issue is enough to argue that an ensemble-based approach to observation impact is bound to provide an incorrect assessments of the observations used in the hybrid systems. This presentation compares these approaches to observation impact using GEOS DAS. | |||
| Área | MET | |||
| Arranjo | urlib.net > BDMCI > Fonds > Produção pgr ATUAIS > MET > Comparing the adjoint-... | |||
| Conteúdo da Pasta doc | não têm arquivos | |||
| Conteúdo da Pasta source | não têm arquivos | |||
| Conteúdo da Pasta agreement |
| |||
| 4. Condições de acesso e uso | ||||
| Idioma | en | |||
| Grupo de Usuários | simone | |||
| Visibilidade | shown | |||
| Permissão de Atualização | não transferida | |||
| 5. Fontes relacionadas | ||||
| Unidades Imediatamente Superiores | 8JMKD3MGPCW/3F35TRS | |||
| Acervo Hospedeiro | urlib.net/www/2017/11.22.19.04 | |||
| 6. Notas | ||||
| Campos Vazios | archivingpolicy archivist booktitle callnumber contenttype copyholder copyright creatorhistory descriptionlevel dissemination doi e-mailaddress edition editor format isbn issn keywords label lineage mark mirrorrepository nextedition notes numberoffiles numberofvolumes orcid organization pages parameterlist parentrepositories previousedition previouslowerunit progress project publisher publisheraddress readergroup readpermission resumeid rightsholder schedulinginformation secondarydate secondarymark serieseditor session shorttitle size sponsor subject targetfile tertiarymark tertiarytype type url versiontype volume | |||
| 7. Controle da descrição | ||||
| e-Mail (login) | simone | |||
| atualizar | ||||