High-Resolution Fengyun-4 Satellite Measurements of Dynamical Tropopause Structure and Variability
The dynamical tropopause is the interface between the stratosphere and the troposphere, whose variation gives indication of weather and climate changes. In the past, the dynamical tropopause height determination mainly depends on analysis and diagnose methods. While, due to the high computational co...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-05-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/12/10/1600 |
| _version_ | 1797567706836238336 |
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| author | Yi-Xuan Shou Feng Lu Shaowen Shou |
| author_facet | Yi-Xuan Shou Feng Lu Shaowen Shou |
| author_sort | Yi-Xuan Shou |
| collection | DOAJ |
| description | The dynamical tropopause is the interface between the stratosphere and the troposphere, whose variation gives indication of weather and climate changes. In the past, the dynamical tropopause height determination mainly depends on analysis and diagnose methods. While, due to the high computational cost, it is difficult to obtain tropopause structures with high spatiotemporal resolution in real time by these methods. To solve this problem, the statistical method is used to establish the dynamical tropopause pressure retrieval model based on Fengyun-4A geostationary meteorological satellite observations. Four regression schemes including random forest (RF) regression are evaluated. By comparison with GEOS-5 (the Goddard Earth Observing System Model of version 5) and ERA-Interim (European Center for Medium-Range Weather Forecasts Reanalysis-Interim) reanalysis, it is found that among the four schemes, the RF-based retrieval model is most accurate and reliable (RMSEs (root mean square errors) are 25.99 hPa and 43.05 hPa, respectively, as compared to GEOS-5 and ERA-Interim reanalysis). A series of sensitivity experiments are performed to investigate the contributions of the predictors in the RF-based model. Results suggest that 6.25 μm channel information representing the distributions of the potential vorticity and water vapor in upper troposphere has the greatest contribution, while 10.8 and 12 μm channels information have relatively weak influences. Therefore, a simplified model without involving a brightness temperature of 10.8 and 12 μm can be adopted to improve the calculation efficiency. |
| first_indexed | 2024-03-10T19:46:18Z |
| format | Article |
| id | doaj.art-06e36b7f38fc4859b66106cc3e628f3b |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T19:46:18Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-06e36b7f38fc4859b66106cc3e628f3b2023-11-20T00:47:00ZengMDPI AGRemote Sensing2072-42922020-05-011210160010.3390/rs12101600High-Resolution Fengyun-4 Satellite Measurements of Dynamical Tropopause Structure and VariabilityYi-Xuan Shou0Feng Lu1Shaowen Shou2Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration (LRCVES/CMA) National Satellite Meteorological Center, Beijing 100081, ChinaKey Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration (LRCVES/CMA) National Satellite Meteorological Center, Beijing 100081, ChinaKey Laboratory of Meteorological Disasters, Nanjing University of Information Sciences & Technology, Nanjing 210044, ChinaThe dynamical tropopause is the interface between the stratosphere and the troposphere, whose variation gives indication of weather and climate changes. In the past, the dynamical tropopause height determination mainly depends on analysis and diagnose methods. While, due to the high computational cost, it is difficult to obtain tropopause structures with high spatiotemporal resolution in real time by these methods. To solve this problem, the statistical method is used to establish the dynamical tropopause pressure retrieval model based on Fengyun-4A geostationary meteorological satellite observations. Four regression schemes including random forest (RF) regression are evaluated. By comparison with GEOS-5 (the Goddard Earth Observing System Model of version 5) and ERA-Interim (European Center for Medium-Range Weather Forecasts Reanalysis-Interim) reanalysis, it is found that among the four schemes, the RF-based retrieval model is most accurate and reliable (RMSEs (root mean square errors) are 25.99 hPa and 43.05 hPa, respectively, as compared to GEOS-5 and ERA-Interim reanalysis). A series of sensitivity experiments are performed to investigate the contributions of the predictors in the RF-based model. Results suggest that 6.25 μm channel information representing the distributions of the potential vorticity and water vapor in upper troposphere has the greatest contribution, while 10.8 and 12 μm channels information have relatively weak influences. Therefore, a simplified model without involving a brightness temperature of 10.8 and 12 μm can be adopted to improve the calculation efficiency.https://www.mdpi.com/2072-4292/12/10/1600dynamical tropopause pressurestatistical retrievalrandom forest regressionFengyun-4 geostationary meteorological satellite |
| spellingShingle | Yi-Xuan Shou Feng Lu Shaowen Shou High-Resolution Fengyun-4 Satellite Measurements of Dynamical Tropopause Structure and Variability Remote Sensing dynamical tropopause pressure statistical retrieval random forest regression Fengyun-4 geostationary meteorological satellite |
| title | High-Resolution Fengyun-4 Satellite Measurements of Dynamical Tropopause Structure and Variability |
| title_full | High-Resolution Fengyun-4 Satellite Measurements of Dynamical Tropopause Structure and Variability |
| title_fullStr | High-Resolution Fengyun-4 Satellite Measurements of Dynamical Tropopause Structure and Variability |
| title_full_unstemmed | High-Resolution Fengyun-4 Satellite Measurements of Dynamical Tropopause Structure and Variability |
| title_short | High-Resolution Fengyun-4 Satellite Measurements of Dynamical Tropopause Structure and Variability |
| title_sort | high resolution fengyun 4 satellite measurements of dynamical tropopause structure and variability |
| topic | dynamical tropopause pressure statistical retrieval random forest regression Fengyun-4 geostationary meteorological satellite |
| url | https://www.mdpi.com/2072-4292/12/10/1600 |
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