Applying a new integrated mass-flux adjustment filter in rapid update cycling of convective-scale data assimilation for the COSMO model (v5.07)
<p>A new integrated mass-flux adjustment filter is introduced, which uses the analyzed integrated mass-flux divergence field to correct the analyzed wind field. The filter has been examined in twin experiments with rapid update cycling using an idealized setup for convective-scale radar data a...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2021-03-01
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| Series: | Geoscientific Model Development |
| Online Access: | https://gmd.copernicus.org/articles/14/1295/2021/gmd-14-1295-2021.pdf |
| _version_ | 1818790206187241472 |
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| author | Y. Zeng A. de Lozar T. Janjic A. Seifert |
| author_facet | Y. Zeng A. de Lozar T. Janjic A. Seifert |
| author_sort | Y. Zeng |
| collection | DOAJ |
| description | <p>A new integrated mass-flux adjustment filter is introduced, which uses the analyzed integrated mass-flux divergence field to correct the
analyzed wind field. The filter has been examined in twin experiments with rapid update cycling
using an idealized setup for convective-scale radar data assimilation. It is found that the new filter slightly reduces the accuracy of background and analysis states;
however, it preserves the main structure of cold pools and primary mesocyclone properties of supercells.
More importantly, it considerably diminishes spurious mass-flux divergence and the high surface pressure tendency, and it thus results in more
dynamically balanced analysis states.
For the ensuing 3 h forecasts, the experiment that employs the filter becomes more skillful after 1 h.
These preliminary results show that the filter is a promising tool to alleviate the imbalance problem caused by data assimilation, especially for convective-scale
applications.</p> |
| first_indexed | 2024-12-18T14:51:46Z |
| format | Article |
| id | doaj.art-6f773da4dbaa4903badb1271bef76a07 |
| institution | Directory Open Access Journal |
| issn | 1991-959X 1991-9603 |
| language | English |
| last_indexed | 2024-12-18T14:51:46Z |
| publishDate | 2021-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Geoscientific Model Development |
| spelling | doaj.art-6f773da4dbaa4903badb1271bef76a072022-12-21T21:04:09ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032021-03-01141295130710.5194/gmd-14-1295-2021Applying a new integrated mass-flux adjustment filter in rapid update cycling of convective-scale data assimilation for the COSMO model (v5.07)Y. Zeng0A. de Lozar1T. Janjic2A. Seifert3Meteorologisches Institut, Ludwig-Maximilians-Universität (LMU) München, Munich, GermanyDeutscher Wetterdienst, Offenbach, GermanyMeteorologisches Institut, Ludwig-Maximilians-Universität (LMU) München, Munich, GermanyDeutscher Wetterdienst, Offenbach, Germany<p>A new integrated mass-flux adjustment filter is introduced, which uses the analyzed integrated mass-flux divergence field to correct the analyzed wind field. The filter has been examined in twin experiments with rapid update cycling using an idealized setup for convective-scale radar data assimilation. It is found that the new filter slightly reduces the accuracy of background and analysis states; however, it preserves the main structure of cold pools and primary mesocyclone properties of supercells. More importantly, it considerably diminishes spurious mass-flux divergence and the high surface pressure tendency, and it thus results in more dynamically balanced analysis states. For the ensuing 3 h forecasts, the experiment that employs the filter becomes more skillful after 1 h. These preliminary results show that the filter is a promising tool to alleviate the imbalance problem caused by data assimilation, especially for convective-scale applications.</p>https://gmd.copernicus.org/articles/14/1295/2021/gmd-14-1295-2021.pdf |
| spellingShingle | Y. Zeng A. de Lozar T. Janjic A. Seifert Applying a new integrated mass-flux adjustment filter in rapid update cycling of convective-scale data assimilation for the COSMO model (v5.07) Geoscientific Model Development |
| title | Applying a new integrated mass-flux adjustment filter in rapid update cycling of convective-scale data assimilation for the COSMO model (v5.07) |
| title_full | Applying a new integrated mass-flux adjustment filter in rapid update cycling of convective-scale data assimilation for the COSMO model (v5.07) |
| title_fullStr | Applying a new integrated mass-flux adjustment filter in rapid update cycling of convective-scale data assimilation for the COSMO model (v5.07) |
| title_full_unstemmed | Applying a new integrated mass-flux adjustment filter in rapid update cycling of convective-scale data assimilation for the COSMO model (v5.07) |
| title_short | Applying a new integrated mass-flux adjustment filter in rapid update cycling of convective-scale data assimilation for the COSMO model (v5.07) |
| title_sort | applying a new integrated mass flux adjustment filter in rapid update cycling of convective scale data assimilation for the cosmo model v5 07 |
| url | https://gmd.copernicus.org/articles/14/1295/2021/gmd-14-1295-2021.pdf |
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