A comparison of limited‐area 3DVAR and ETKF‐En3DVAR data assimilation using radar observations at convective scale for the prediction of Typhoon Saomai (2006)
The ensemble transform Kalman filter based ensemble 3D variational ( ETKF‐En3DVAR ) data assimilation ( DA ) system is employed to evaluate the potential value of assimilating radar radial wind ( V r ) data for the analysis and forecasting of T yphoon S aomai (2006). The DA system conducted cycling...
Ausführliche Beschreibung
Autor*in: |
Shen, Feifei [verfasserIn] |
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Format: |
Artikel |
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Sprache: |
Englisch |
Erschienen: |
2017 |
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Rechteinformationen: |
Nutzungsrecht: © 2017 Royal Meteorological Society |
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Übergeordnetes Werk: |
Enthalten in: Meteorological applications - Bognor Regis : Wiley, 1994, 24(2017), 4, Seite 628-641 |
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Übergeordnetes Werk: |
volume:24 ; year:2017 ; number:4 ; pages:628-641 |
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DOI / URN: |
10.1002/met.1663 |
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Katalog-ID: |
OLC1998312445 |
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520 | |a The ensemble transform Kalman filter based ensemble 3D variational ( ETKF‐En3DVAR ) data assimilation ( DA ) system is employed to evaluate the potential value of assimilating radar radial wind ( V r ) data for the analysis and forecasting of T yphoon S aomai (2006). The DA system conducted cycling assimilation every 30 min when S aomai started to enter radar coverage. Within the DA cycles, the control analysis was updated by the ETKF‐En3DVAR algorithm whereas the forecast ensemble perturbations in the hybrid scheme were updated by the ETKF algorithm. The benefits from the use of the flow‐dependent ensemble covariance are explored by comparing the analysis increments, analysis and subsequent forecasts from the hybrid scheme with those from a pure 3DVAR using static background error covariance. Sensitivity to the horizontal correlation scale in the 3DVAR and the vertical covariance localization in the hybrid are also explored. The reduced horizontal correlation scale in the 3DVAR yields much more reasonable circulation analyses than the default scale. The vertical covariance localization scale specified in terms of geometric height instead of model levels allows for desirable spreading of V r data to the surface. It seems that the assimilation with the hybrid method leads to further improved vortex intensity forecast and track forecast of the typhoon compared to those in the analyses from the global forecast system and 3DVAR . The results also indicated that the hybrid has a significant effect on the 12 h accumulated rainfall forecasts. Such improvements for analysis and forecast are probably due to the use of the flow‐dependent background error covariance. | ||
540 | |a Nutzungsrecht: © 2017 Royal Meteorological Society | ||
650 | 4 | |a hybrid assimilation | |
650 | 4 | |a model | |
650 | 4 | |a WRF | |
650 | 4 | |a radar radial velocity | |
650 | 4 | |a Data collection | |
650 | 4 | |a Computational fluid dynamics | |
650 | 4 | |a Data processing | |
650 | 4 | |a Mathematical models | |
650 | 4 | |a Radar data | |
650 | 4 | |a Error detection | |
650 | 4 | |a Rainfall | |
650 | 4 | |a Kalman filters | |
650 | 4 | |a Kalman filter | |
650 | 4 | |a Localization | |
650 | 4 | |a Correlation | |
650 | 4 | |a Position (location) | |
650 | 4 | |a Data assimilation | |
650 | 4 | |a Covariance | |
650 | 4 | |a Data | |
650 | 4 | |a Analysis | |
650 | 4 | |a Radar | |
650 | 4 | |a Assimilation | |
650 | 4 | |a Rain | |
650 | 4 | |a Typhoons | |
700 | 1 | |a Xue, Ming |4 oth | |
700 | 1 | |a Min, Jinzhong |4 oth | |
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10.1002/met.1663 doi PQ20171228 (DE-627)OLC1998312445 (DE-599)GBVOLC1998312445 (PRQ)p1313-ccb5955d62085bf0ba874954689b053a8b4aaa91e36c3f8cc279917f38e86ad3 (KEY)0238303920170000024000400628comparisonoflimitedarea3dvarandetkfen3dvardataassi DE-627 ger DE-627 rakwb eng 550 ZDB Shen, Feifei verfasserin aut A comparison of limited‐area 3DVAR and ETKF‐En3DVAR data assimilation using radar observations at convective scale for the prediction of Typhoon Saomai (2006) 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The ensemble transform Kalman filter based ensemble 3D variational ( ETKF‐En3DVAR ) data assimilation ( DA ) system is employed to evaluate the potential value of assimilating radar radial wind ( V r ) data for the analysis and forecasting of T yphoon S aomai (2006). The DA system conducted cycling assimilation every 30 min when S aomai started to enter radar coverage. Within the DA cycles, the control analysis was updated by the ETKF‐En3DVAR algorithm whereas the forecast ensemble perturbations in the hybrid scheme were updated by the ETKF algorithm. The benefits from the use of the flow‐dependent ensemble covariance are explored by comparing the analysis increments, analysis and subsequent forecasts from the hybrid scheme with those from a pure 3DVAR using static background error covariance. Sensitivity to the horizontal correlation scale in the 3DVAR and the vertical covariance localization in the hybrid are also explored. The reduced horizontal correlation scale in the 3DVAR yields much more reasonable circulation analyses than the default scale. The vertical covariance localization scale specified in terms of geometric height instead of model levels allows for desirable spreading of V r data to the surface. It seems that the assimilation with the hybrid method leads to further improved vortex intensity forecast and track forecast of the typhoon compared to those in the analyses from the global forecast system and 3DVAR . The results also indicated that the hybrid has a significant effect on the 12 h accumulated rainfall forecasts. Such improvements for analysis and forecast are probably due to the use of the flow‐dependent background error covariance. Nutzungsrecht: © 2017 Royal Meteorological Society hybrid assimilation model WRF radar radial velocity Data collection Computational fluid dynamics Data processing Mathematical models Radar data Error detection Rainfall Kalman filters Kalman filter Localization Correlation Position (location) Data assimilation Covariance Data Analysis Radar Assimilation Rain Typhoons Xue, Ming oth Min, Jinzhong oth Enthalten in Meteorological applications Bognor Regis : Wiley, 1994 24(2017), 4, Seite 628-641 (DE-627)188146865 (DE-600)1280578-6 (DE-576)334708931 1350-4827 nnns volume:24 year:2017 number:4 pages:628-641 http://dx.doi.org/10.1002/met.1663 Volltext http://onlinelibrary.wiley.com/doi/10.1002/met.1663/abstract https://search.proquest.com/docview/1947367120 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_601 AR 24 2017 4 628-641 |
spelling |
10.1002/met.1663 doi PQ20171228 (DE-627)OLC1998312445 (DE-599)GBVOLC1998312445 (PRQ)p1313-ccb5955d62085bf0ba874954689b053a8b4aaa91e36c3f8cc279917f38e86ad3 (KEY)0238303920170000024000400628comparisonoflimitedarea3dvarandetkfen3dvardataassi DE-627 ger DE-627 rakwb eng 550 ZDB Shen, Feifei verfasserin aut A comparison of limited‐area 3DVAR and ETKF‐En3DVAR data assimilation using radar observations at convective scale for the prediction of Typhoon Saomai (2006) 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The ensemble transform Kalman filter based ensemble 3D variational ( ETKF‐En3DVAR ) data assimilation ( DA ) system is employed to evaluate the potential value of assimilating radar radial wind ( V r ) data for the analysis and forecasting of T yphoon S aomai (2006). The DA system conducted cycling assimilation every 30 min when S aomai started to enter radar coverage. Within the DA cycles, the control analysis was updated by the ETKF‐En3DVAR algorithm whereas the forecast ensemble perturbations in the hybrid scheme were updated by the ETKF algorithm. The benefits from the use of the flow‐dependent ensemble covariance are explored by comparing the analysis increments, analysis and subsequent forecasts from the hybrid scheme with those from a pure 3DVAR using static background error covariance. Sensitivity to the horizontal correlation scale in the 3DVAR and the vertical covariance localization in the hybrid are also explored. The reduced horizontal correlation scale in the 3DVAR yields much more reasonable circulation analyses than the default scale. The vertical covariance localization scale specified in terms of geometric height instead of model levels allows for desirable spreading of V r data to the surface. It seems that the assimilation with the hybrid method leads to further improved vortex intensity forecast and track forecast of the typhoon compared to those in the analyses from the global forecast system and 3DVAR . The results also indicated that the hybrid has a significant effect on the 12 h accumulated rainfall forecasts. Such improvements for analysis and forecast are probably due to the use of the flow‐dependent background error covariance. Nutzungsrecht: © 2017 Royal Meteorological Society hybrid assimilation model WRF radar radial velocity Data collection Computational fluid dynamics Data processing Mathematical models Radar data Error detection Rainfall Kalman filters Kalman filter Localization Correlation Position (location) Data assimilation Covariance Data Analysis Radar Assimilation Rain Typhoons Xue, Ming oth Min, Jinzhong oth Enthalten in Meteorological applications Bognor Regis : Wiley, 1994 24(2017), 4, Seite 628-641 (DE-627)188146865 (DE-600)1280578-6 (DE-576)334708931 1350-4827 nnns volume:24 year:2017 number:4 pages:628-641 http://dx.doi.org/10.1002/met.1663 Volltext http://onlinelibrary.wiley.com/doi/10.1002/met.1663/abstract https://search.proquest.com/docview/1947367120 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_601 AR 24 2017 4 628-641 |
allfields_unstemmed |
10.1002/met.1663 doi PQ20171228 (DE-627)OLC1998312445 (DE-599)GBVOLC1998312445 (PRQ)p1313-ccb5955d62085bf0ba874954689b053a8b4aaa91e36c3f8cc279917f38e86ad3 (KEY)0238303920170000024000400628comparisonoflimitedarea3dvarandetkfen3dvardataassi DE-627 ger DE-627 rakwb eng 550 ZDB Shen, Feifei verfasserin aut A comparison of limited‐area 3DVAR and ETKF‐En3DVAR data assimilation using radar observations at convective scale for the prediction of Typhoon Saomai (2006) 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The ensemble transform Kalman filter based ensemble 3D variational ( ETKF‐En3DVAR ) data assimilation ( DA ) system is employed to evaluate the potential value of assimilating radar radial wind ( V r ) data for the analysis and forecasting of T yphoon S aomai (2006). The DA system conducted cycling assimilation every 30 min when S aomai started to enter radar coverage. Within the DA cycles, the control analysis was updated by the ETKF‐En3DVAR algorithm whereas the forecast ensemble perturbations in the hybrid scheme were updated by the ETKF algorithm. The benefits from the use of the flow‐dependent ensemble covariance are explored by comparing the analysis increments, analysis and subsequent forecasts from the hybrid scheme with those from a pure 3DVAR using static background error covariance. Sensitivity to the horizontal correlation scale in the 3DVAR and the vertical covariance localization in the hybrid are also explored. The reduced horizontal correlation scale in the 3DVAR yields much more reasonable circulation analyses than the default scale. The vertical covariance localization scale specified in terms of geometric height instead of model levels allows for desirable spreading of V r data to the surface. It seems that the assimilation with the hybrid method leads to further improved vortex intensity forecast and track forecast of the typhoon compared to those in the analyses from the global forecast system and 3DVAR . The results also indicated that the hybrid has a significant effect on the 12 h accumulated rainfall forecasts. Such improvements for analysis and forecast are probably due to the use of the flow‐dependent background error covariance. Nutzungsrecht: © 2017 Royal Meteorological Society hybrid assimilation model WRF radar radial velocity Data collection Computational fluid dynamics Data processing Mathematical models Radar data Error detection Rainfall Kalman filters Kalman filter Localization Correlation Position (location) Data assimilation Covariance Data Analysis Radar Assimilation Rain Typhoons Xue, Ming oth Min, Jinzhong oth Enthalten in Meteorological applications Bognor Regis : Wiley, 1994 24(2017), 4, Seite 628-641 (DE-627)188146865 (DE-600)1280578-6 (DE-576)334708931 1350-4827 nnns volume:24 year:2017 number:4 pages:628-641 http://dx.doi.org/10.1002/met.1663 Volltext http://onlinelibrary.wiley.com/doi/10.1002/met.1663/abstract https://search.proquest.com/docview/1947367120 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_601 AR 24 2017 4 628-641 |
allfieldsGer |
10.1002/met.1663 doi PQ20171228 (DE-627)OLC1998312445 (DE-599)GBVOLC1998312445 (PRQ)p1313-ccb5955d62085bf0ba874954689b053a8b4aaa91e36c3f8cc279917f38e86ad3 (KEY)0238303920170000024000400628comparisonoflimitedarea3dvarandetkfen3dvardataassi DE-627 ger DE-627 rakwb eng 550 ZDB Shen, Feifei verfasserin aut A comparison of limited‐area 3DVAR and ETKF‐En3DVAR data assimilation using radar observations at convective scale for the prediction of Typhoon Saomai (2006) 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The ensemble transform Kalman filter based ensemble 3D variational ( ETKF‐En3DVAR ) data assimilation ( DA ) system is employed to evaluate the potential value of assimilating radar radial wind ( V r ) data for the analysis and forecasting of T yphoon S aomai (2006). The DA system conducted cycling assimilation every 30 min when S aomai started to enter radar coverage. Within the DA cycles, the control analysis was updated by the ETKF‐En3DVAR algorithm whereas the forecast ensemble perturbations in the hybrid scheme were updated by the ETKF algorithm. The benefits from the use of the flow‐dependent ensemble covariance are explored by comparing the analysis increments, analysis and subsequent forecasts from the hybrid scheme with those from a pure 3DVAR using static background error covariance. Sensitivity to the horizontal correlation scale in the 3DVAR and the vertical covariance localization in the hybrid are also explored. The reduced horizontal correlation scale in the 3DVAR yields much more reasonable circulation analyses than the default scale. The vertical covariance localization scale specified in terms of geometric height instead of model levels allows for desirable spreading of V r data to the surface. It seems that the assimilation with the hybrid method leads to further improved vortex intensity forecast and track forecast of the typhoon compared to those in the analyses from the global forecast system and 3DVAR . The results also indicated that the hybrid has a significant effect on the 12 h accumulated rainfall forecasts. Such improvements for analysis and forecast are probably due to the use of the flow‐dependent background error covariance. Nutzungsrecht: © 2017 Royal Meteorological Society hybrid assimilation model WRF radar radial velocity Data collection Computational fluid dynamics Data processing Mathematical models Radar data Error detection Rainfall Kalman filters Kalman filter Localization Correlation Position (location) Data assimilation Covariance Data Analysis Radar Assimilation Rain Typhoons Xue, Ming oth Min, Jinzhong oth Enthalten in Meteorological applications Bognor Regis : Wiley, 1994 24(2017), 4, Seite 628-641 (DE-627)188146865 (DE-600)1280578-6 (DE-576)334708931 1350-4827 nnns volume:24 year:2017 number:4 pages:628-641 http://dx.doi.org/10.1002/met.1663 Volltext http://onlinelibrary.wiley.com/doi/10.1002/met.1663/abstract https://search.proquest.com/docview/1947367120 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_601 AR 24 2017 4 628-641 |
allfieldsSound |
10.1002/met.1663 doi PQ20171228 (DE-627)OLC1998312445 (DE-599)GBVOLC1998312445 (PRQ)p1313-ccb5955d62085bf0ba874954689b053a8b4aaa91e36c3f8cc279917f38e86ad3 (KEY)0238303920170000024000400628comparisonoflimitedarea3dvarandetkfen3dvardataassi DE-627 ger DE-627 rakwb eng 550 ZDB Shen, Feifei verfasserin aut A comparison of limited‐area 3DVAR and ETKF‐En3DVAR data assimilation using radar observations at convective scale for the prediction of Typhoon Saomai (2006) 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The ensemble transform Kalman filter based ensemble 3D variational ( ETKF‐En3DVAR ) data assimilation ( DA ) system is employed to evaluate the potential value of assimilating radar radial wind ( V r ) data for the analysis and forecasting of T yphoon S aomai (2006). The DA system conducted cycling assimilation every 30 min when S aomai started to enter radar coverage. Within the DA cycles, the control analysis was updated by the ETKF‐En3DVAR algorithm whereas the forecast ensemble perturbations in the hybrid scheme were updated by the ETKF algorithm. The benefits from the use of the flow‐dependent ensemble covariance are explored by comparing the analysis increments, analysis and subsequent forecasts from the hybrid scheme with those from a pure 3DVAR using static background error covariance. Sensitivity to the horizontal correlation scale in the 3DVAR and the vertical covariance localization in the hybrid are also explored. The reduced horizontal correlation scale in the 3DVAR yields much more reasonable circulation analyses than the default scale. The vertical covariance localization scale specified in terms of geometric height instead of model levels allows for desirable spreading of V r data to the surface. It seems that the assimilation with the hybrid method leads to further improved vortex intensity forecast and track forecast of the typhoon compared to those in the analyses from the global forecast system and 3DVAR . The results also indicated that the hybrid has a significant effect on the 12 h accumulated rainfall forecasts. Such improvements for analysis and forecast are probably due to the use of the flow‐dependent background error covariance. Nutzungsrecht: © 2017 Royal Meteorological Society hybrid assimilation model WRF radar radial velocity Data collection Computational fluid dynamics Data processing Mathematical models Radar data Error detection Rainfall Kalman filters Kalman filter Localization Correlation Position (location) Data assimilation Covariance Data Analysis Radar Assimilation Rain Typhoons Xue, Ming oth Min, Jinzhong oth Enthalten in Meteorological applications Bognor Regis : Wiley, 1994 24(2017), 4, Seite 628-641 (DE-627)188146865 (DE-600)1280578-6 (DE-576)334708931 1350-4827 nnns volume:24 year:2017 number:4 pages:628-641 http://dx.doi.org/10.1002/met.1663 Volltext http://onlinelibrary.wiley.com/doi/10.1002/met.1663/abstract https://search.proquest.com/docview/1947367120 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_601 AR 24 2017 4 628-641 |
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Enthalten in Meteorological applications 24(2017), 4, Seite 628-641 volume:24 year:2017 number:4 pages:628-641 |
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hybrid assimilation model WRF radar radial velocity Data collection Computational fluid dynamics Data processing Mathematical models Radar data Error detection Rainfall Kalman filters Kalman filter Localization Correlation Position (location) Data assimilation Covariance Data Analysis Radar Assimilation Rain Typhoons |
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Shen, Feifei ddc 550 misc hybrid assimilation misc model misc WRF misc radar radial velocity misc Data collection misc Computational fluid dynamics misc Data processing misc Mathematical models misc Radar data misc Error detection misc Rainfall misc Kalman filters misc Kalman filter misc Localization misc Correlation misc Position (location) misc Data assimilation misc Covariance misc Data misc Analysis misc Radar misc Assimilation misc Rain misc Typhoons A comparison of limited‐area 3DVAR and ETKF‐En3DVAR data assimilation using radar observations at convective scale for the prediction of Typhoon Saomai (2006) |
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550 ZDB A comparison of limited‐area 3DVAR and ETKF‐En3DVAR data assimilation using radar observations at convective scale for the prediction of Typhoon Saomai (2006) hybrid assimilation model WRF radar radial velocity Data collection Computational fluid dynamics Data processing Mathematical models Radar data Error detection Rainfall Kalman filters Kalman filter Localization Correlation Position (location) Data assimilation Covariance Data Analysis Radar Assimilation Rain Typhoons |
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ddc 550 misc hybrid assimilation misc model misc WRF misc radar radial velocity misc Data collection misc Computational fluid dynamics misc Data processing misc Mathematical models misc Radar data misc Error detection misc Rainfall misc Kalman filters misc Kalman filter misc Localization misc Correlation misc Position (location) misc Data assimilation misc Covariance misc Data misc Analysis misc Radar misc Assimilation misc Rain misc Typhoons |
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ddc 550 misc hybrid assimilation misc model misc WRF misc radar radial velocity misc Data collection misc Computational fluid dynamics misc Data processing misc Mathematical models misc Radar data misc Error detection misc Rainfall misc Kalman filters misc Kalman filter misc Localization misc Correlation misc Position (location) misc Data assimilation misc Covariance misc Data misc Analysis misc Radar misc Assimilation misc Rain misc Typhoons |
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A comparison of limited‐area 3DVAR and ETKF‐En3DVAR data assimilation using radar observations at convective scale for the prediction of Typhoon Saomai (2006) |
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A comparison of limited‐area 3DVAR and ETKF‐En3DVAR data assimilation using radar observations at convective scale for the prediction of Typhoon Saomai (2006) |
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comparison of limited‐area 3dvar and etkf‐en3dvar data assimilation using radar observations at convective scale for the prediction of typhoon saomai (2006) |
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A comparison of limited‐area 3DVAR and ETKF‐En3DVAR data assimilation using radar observations at convective scale for the prediction of Typhoon Saomai (2006) |
abstract |
The ensemble transform Kalman filter based ensemble 3D variational ( ETKF‐En3DVAR ) data assimilation ( DA ) system is employed to evaluate the potential value of assimilating radar radial wind ( V r ) data for the analysis and forecasting of T yphoon S aomai (2006). The DA system conducted cycling assimilation every 30 min when S aomai started to enter radar coverage. Within the DA cycles, the control analysis was updated by the ETKF‐En3DVAR algorithm whereas the forecast ensemble perturbations in the hybrid scheme were updated by the ETKF algorithm. The benefits from the use of the flow‐dependent ensemble covariance are explored by comparing the analysis increments, analysis and subsequent forecasts from the hybrid scheme with those from a pure 3DVAR using static background error covariance. Sensitivity to the horizontal correlation scale in the 3DVAR and the vertical covariance localization in the hybrid are also explored. The reduced horizontal correlation scale in the 3DVAR yields much more reasonable circulation analyses than the default scale. The vertical covariance localization scale specified in terms of geometric height instead of model levels allows for desirable spreading of V r data to the surface. It seems that the assimilation with the hybrid method leads to further improved vortex intensity forecast and track forecast of the typhoon compared to those in the analyses from the global forecast system and 3DVAR . The results also indicated that the hybrid has a significant effect on the 12 h accumulated rainfall forecasts. Such improvements for analysis and forecast are probably due to the use of the flow‐dependent background error covariance. |
abstractGer |
The ensemble transform Kalman filter based ensemble 3D variational ( ETKF‐En3DVAR ) data assimilation ( DA ) system is employed to evaluate the potential value of assimilating radar radial wind ( V r ) data for the analysis and forecasting of T yphoon S aomai (2006). The DA system conducted cycling assimilation every 30 min when S aomai started to enter radar coverage. Within the DA cycles, the control analysis was updated by the ETKF‐En3DVAR algorithm whereas the forecast ensemble perturbations in the hybrid scheme were updated by the ETKF algorithm. The benefits from the use of the flow‐dependent ensemble covariance are explored by comparing the analysis increments, analysis and subsequent forecasts from the hybrid scheme with those from a pure 3DVAR using static background error covariance. Sensitivity to the horizontal correlation scale in the 3DVAR and the vertical covariance localization in the hybrid are also explored. The reduced horizontal correlation scale in the 3DVAR yields much more reasonable circulation analyses than the default scale. The vertical covariance localization scale specified in terms of geometric height instead of model levels allows for desirable spreading of V r data to the surface. It seems that the assimilation with the hybrid method leads to further improved vortex intensity forecast and track forecast of the typhoon compared to those in the analyses from the global forecast system and 3DVAR . The results also indicated that the hybrid has a significant effect on the 12 h accumulated rainfall forecasts. Such improvements for analysis and forecast are probably due to the use of the flow‐dependent background error covariance. |
abstract_unstemmed |
The ensemble transform Kalman filter based ensemble 3D variational ( ETKF‐En3DVAR ) data assimilation ( DA ) system is employed to evaluate the potential value of assimilating radar radial wind ( V r ) data for the analysis and forecasting of T yphoon S aomai (2006). The DA system conducted cycling assimilation every 30 min when S aomai started to enter radar coverage. Within the DA cycles, the control analysis was updated by the ETKF‐En3DVAR algorithm whereas the forecast ensemble perturbations in the hybrid scheme were updated by the ETKF algorithm. The benefits from the use of the flow‐dependent ensemble covariance are explored by comparing the analysis increments, analysis and subsequent forecasts from the hybrid scheme with those from a pure 3DVAR using static background error covariance. Sensitivity to the horizontal correlation scale in the 3DVAR and the vertical covariance localization in the hybrid are also explored. The reduced horizontal correlation scale in the 3DVAR yields much more reasonable circulation analyses than the default scale. The vertical covariance localization scale specified in terms of geometric height instead of model levels allows for desirable spreading of V r data to the surface. It seems that the assimilation with the hybrid method leads to further improved vortex intensity forecast and track forecast of the typhoon compared to those in the analyses from the global forecast system and 3DVAR . The results also indicated that the hybrid has a significant effect on the 12 h accumulated rainfall forecasts. Such improvements for analysis and forecast are probably due to the use of the flow‐dependent background error covariance. |
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title_short |
A comparison of limited‐area 3DVAR and ETKF‐En3DVAR data assimilation using radar observations at convective scale for the prediction of Typhoon Saomai (2006) |
url |
http://dx.doi.org/10.1002/met.1663 http://onlinelibrary.wiley.com/doi/10.1002/met.1663/abstract https://search.proquest.com/docview/1947367120 |
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