Evaluating the Performance of a Convection-Permitting Model by Using Dual-Polarimetric Radar Parameters: Case Study of SoWMEX IOP8
In this study, a dual-polarimetric radar observation operator is established and modified for the Taiwan area for the purpose of model verification. A severe squall line case during the Southwest Monsoon Experiment Intensive Observing Period 8 (SoWMEX IOP#8) on 14 June 2008, is selected and examined...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-09-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/12/18/3004 |
| _version_ | 1797553663508480000 |
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| author | Cheng-Rong You Kao-Shen Chung Chih-Chien Tsai |
| author_facet | Cheng-Rong You Kao-Shen Chung Chih-Chien Tsai |
| author_sort | Cheng-Rong You |
| collection | DOAJ |
| description | In this study, a dual-polarimetric radar observation operator is established and modified for the Taiwan area for the purpose of model verification. A severe squall line case during the Southwest Monsoon Experiment Intensive Observing Period 8 (SoWMEX IOP#8) on 14 June 2008, is selected and examined. Because the operator is adopted from the use of the midlatitude region, sensitivity tests are performed to obtain the optimal setting of the operator in the subtropical region. To accurately capture the dynamic structure of the squall lines, the ensemble-based data assimilation system, which assimilates both radial wind and reflectivity data, is used to obtain the optimal analysis field on the mesoscale for evaluating the performance of model simulation. The characteristics of two microphysics schemes are investigated, and the results obtained using the schemes are compared with the S-band dual-polarimetric radar observations. The horizontal and vertical cross-sections show that the analyses resemble the observations. Both schemes can replicate the polarimetric parameter signature such as <inline-formula><math display="inline"><semantics><mrow><msub><mi>Z</mi><mrow><mi>D</mi><mi>R</mi></mrow></msub></mrow></semantics></math></inline-formula> and <inline-formula><math display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>D</mi><mi>P</mi></mrow></msub></mrow></semantics></math></inline-formula> columns. When comparing model simulation with polarimetric parameters through the drawing of contour frequency by altitude diagrams (CFADs), the results reveal that the single moment microphysics scheme performs better than the double moment scheme in this case. However, the reflectivity field in the stratiform area is more accurately captured when using the double moment scheme. Furthermore, validation with polarimetric variables (<inline-formula><math display="inline"><semantics><mrow><msub><mi>Z</mi><mi>H</mi></msub></mrow></semantics></math></inline-formula>, <inline-formula><math display="inline"><semantics><mrow><msub><mi>Z</mi><mrow><mi>D</mi><mi>R</mi></mrow></msub></mrow></semantics></math></inline-formula> and <inline-formula><math display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>D</mi><mi>P</mi></mrow></msub></mrow></semantics></math></inline-formula>) histograms shows underestimation of the <inline-formula><math display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>D</mi><mi>P</mi></mrow></msub></mrow></semantics></math></inline-formula> field in both schemes. Overall, this study indicates the benefit of assimilating radial wind and reflectivity data for the analyses of severe precipitation systems and the necessity of assimilating polarimetric parameters for the accuracy of microphysical processes, especially complex microphysics schemes in subtropical region. |
| first_indexed | 2024-03-10T16:19:47Z |
| format | Article |
| id | doaj.art-a30da95d912f415dbea607175eac1889 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T16:19:47Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-a30da95d912f415dbea607175eac18892023-11-20T13:49:08ZengMDPI AGRemote Sensing2072-42922020-09-011218300410.3390/rs12183004Evaluating the Performance of a Convection-Permitting Model by Using Dual-Polarimetric Radar Parameters: Case Study of SoWMEX IOP8Cheng-Rong You0Kao-Shen Chung1Chih-Chien Tsai2Department of Atmospheric Sciences, National Central University, Chung-Li District, Tao-Yuan City 32001, TaiwanDepartment of Atmospheric Sciences, National Central University, Chung-Li District, Tao-Yuan City 32001, TaiwanNational Science and Technology Center for Disaster Reduction, Xin-Dian District, New Taipei City 23143, TaiwanIn this study, a dual-polarimetric radar observation operator is established and modified for the Taiwan area for the purpose of model verification. A severe squall line case during the Southwest Monsoon Experiment Intensive Observing Period 8 (SoWMEX IOP#8) on 14 June 2008, is selected and examined. Because the operator is adopted from the use of the midlatitude region, sensitivity tests are performed to obtain the optimal setting of the operator in the subtropical region. To accurately capture the dynamic structure of the squall lines, the ensemble-based data assimilation system, which assimilates both radial wind and reflectivity data, is used to obtain the optimal analysis field on the mesoscale for evaluating the performance of model simulation. The characteristics of two microphysics schemes are investigated, and the results obtained using the schemes are compared with the S-band dual-polarimetric radar observations. The horizontal and vertical cross-sections show that the analyses resemble the observations. Both schemes can replicate the polarimetric parameter signature such as <inline-formula><math display="inline"><semantics><mrow><msub><mi>Z</mi><mrow><mi>D</mi><mi>R</mi></mrow></msub></mrow></semantics></math></inline-formula> and <inline-formula><math display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>D</mi><mi>P</mi></mrow></msub></mrow></semantics></math></inline-formula> columns. When comparing model simulation with polarimetric parameters through the drawing of contour frequency by altitude diagrams (CFADs), the results reveal that the single moment microphysics scheme performs better than the double moment scheme in this case. However, the reflectivity field in the stratiform area is more accurately captured when using the double moment scheme. Furthermore, validation with polarimetric variables (<inline-formula><math display="inline"><semantics><mrow><msub><mi>Z</mi><mi>H</mi></msub></mrow></semantics></math></inline-formula>, <inline-formula><math display="inline"><semantics><mrow><msub><mi>Z</mi><mrow><mi>D</mi><mi>R</mi></mrow></msub></mrow></semantics></math></inline-formula> and <inline-formula><math display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>D</mi><mi>P</mi></mrow></msub></mrow></semantics></math></inline-formula>) histograms shows underestimation of the <inline-formula><math display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>D</mi><mi>P</mi></mrow></msub></mrow></semantics></math></inline-formula> field in both schemes. Overall, this study indicates the benefit of assimilating radial wind and reflectivity data for the analyses of severe precipitation systems and the necessity of assimilating polarimetric parameters for the accuracy of microphysical processes, especially complex microphysics schemes in subtropical region.https://www.mdpi.com/2072-4292/12/18/3004dual-polarimetric radar parametersradar data assimilationmodel validation |
| spellingShingle | Cheng-Rong You Kao-Shen Chung Chih-Chien Tsai Evaluating the Performance of a Convection-Permitting Model by Using Dual-Polarimetric Radar Parameters: Case Study of SoWMEX IOP8 Remote Sensing dual-polarimetric radar parameters radar data assimilation model validation |
| title | Evaluating the Performance of a Convection-Permitting Model by Using Dual-Polarimetric Radar Parameters: Case Study of SoWMEX IOP8 |
| title_full | Evaluating the Performance of a Convection-Permitting Model by Using Dual-Polarimetric Radar Parameters: Case Study of SoWMEX IOP8 |
| title_fullStr | Evaluating the Performance of a Convection-Permitting Model by Using Dual-Polarimetric Radar Parameters: Case Study of SoWMEX IOP8 |
| title_full_unstemmed | Evaluating the Performance of a Convection-Permitting Model by Using Dual-Polarimetric Radar Parameters: Case Study of SoWMEX IOP8 |
| title_short | Evaluating the Performance of a Convection-Permitting Model by Using Dual-Polarimetric Radar Parameters: Case Study of SoWMEX IOP8 |
| title_sort | evaluating the performance of a convection permitting model by using dual polarimetric radar parameters case study of sowmex iop8 |
| topic | dual-polarimetric radar parameters radar data assimilation model validation |
| url | https://www.mdpi.com/2072-4292/12/18/3004 |
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