Numerical Simulation and Diagnosis of a Precipitation in Qilian Mountains under the Coupling of Upper and Lower Systems
Based on ERA5 reanalysis data and CLDAS land grid precipitation data from the National Meteorological Information Center， a systematic WRF numerical simulation and precipitation mechanism diagnosis of a typical systematic precipitation process in the Qilian Mountains are carried out in this paper.Th...
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Science Press, PR China
2023-10-01
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| Series: | Gaoyuan qixiang |
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| Online Access: | http://www.gyqx.ac.cn/EN/10.7522/j.issn.1000-0534.2022.00096 |
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| author | Qiang JIANG LinBo WEI Chao LI Yan LI HongYu WANG |
| author_facet | Qiang JIANG LinBo WEI Chao LI Yan LI HongYu WANG |
| author_sort | Qiang JIANG |
| collection | DOAJ |
| description | Based on ERA5 reanalysis data and CLDAS land grid precipitation data from the National Meteorological Information Center， a systematic WRF numerical simulation and precipitation mechanism diagnosis of a typical systematic precipitation process in the Qilian Mountains are carried out in this paper.The dynamic diagnosis results of the circulation background field show that the interaction between the mesoscale upper trough system and the local lower flow around and flow over provides important dynamic conditions.The mesoscale dynamic uplift in front of the trough caused by the development of the upper trough determines the distribution of the heavy precipitation belt during the precipitation process， while the lower flow around and flow over provide direct dynamic conditions for local heavy precipitation.The further diagnosis results of water vapor transport and budget show that the water vapor source of this precipitation mainly comes from the Sichuan Basin.The flow around will transport abundant water vapor for the precipitation area in front of the windward slope， and the flow over will promote the reverse gradient transport of water vapor along the terrain height and converge near the precipitation center.In the stage of heavy precipitation， the vertical transport of water vapor contributes the most to the water vapor budget， followed by the convergence of water vapor， and the local variation of water vapor can be basically ignored.Finally， the diagnostic results of atmospheric stratification characteristics show that when both atmospheric dynamic conditions and water vapor conditions are conducive to precipitation， combined with the enhancement of the instability of low and medium tropospheric stratification， it is easier to trigger convection and enhance precipitation in front of the windward slope. |
| format | Article |
| id | doaj-art-ad3bbbb563294ea7b0d9e5c05093ca5a |
| institution | OA Journals |
| issn | 1000-0534 |
| language | zho |
| publishDate | 2023-10-01 |
| publisher | Science Press, PR China |
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| series | Gaoyuan qixiang |
| spelling | doaj-art-ad3bbbb563294ea7b0d9e5c05093ca5a2025-08-20T02:11:26ZzhoScience Press, PR ChinaGaoyuan qixiang1000-05342023-10-014251298131010.7522/j.issn.1000-0534.2022.000961000-0534（2023）05-1298-13Numerical Simulation and Diagnosis of a Precipitation in Qilian Mountains under the Coupling of Upper and Lower SystemsQiang JIANG0LinBo WEI1Chao LI2Yan LI3HongYu WANG4School of Atmospheric Sciences， Lanzhou University， Lanzhou 730000， Gansu， ChinaSchool of Atmospheric Sciences， Lanzhou University， Lanzhou 730000， Gansu， ChinaHubei Key Laboratory of Rainstorm Monitoring and Early Warning， Wuhan Rainstorm Research Institute， China Meteorological Administration， Wuhan 430205， Hubei， ChinaSchool of Atmospheric Sciences， Lanzhou University， Lanzhou 730000， Gansu， ChinaSchool of Atmospheric Sciences， Lanzhou University， Lanzhou 730000， Gansu， ChinaBased on ERA5 reanalysis data and CLDAS land grid precipitation data from the National Meteorological Information Center， a systematic WRF numerical simulation and precipitation mechanism diagnosis of a typical systematic precipitation process in the Qilian Mountains are carried out in this paper.The dynamic diagnosis results of the circulation background field show that the interaction between the mesoscale upper trough system and the local lower flow around and flow over provides important dynamic conditions.The mesoscale dynamic uplift in front of the trough caused by the development of the upper trough determines the distribution of the heavy precipitation belt during the precipitation process， while the lower flow around and flow over provide direct dynamic conditions for local heavy precipitation.The further diagnosis results of water vapor transport and budget show that the water vapor source of this precipitation mainly comes from the Sichuan Basin.The flow around will transport abundant water vapor for the precipitation area in front of the windward slope， and the flow over will promote the reverse gradient transport of water vapor along the terrain height and converge near the precipitation center.In the stage of heavy precipitation， the vertical transport of water vapor contributes the most to the water vapor budget， followed by the convergence of water vapor， and the local variation of water vapor can be basically ignored.Finally， the diagnostic results of atmospheric stratification characteristics show that when both atmospheric dynamic conditions and water vapor conditions are conducive to precipitation， combined with the enhancement of the instability of low and medium tropospheric stratification， it is easier to trigger convection and enhance precipitation in front of the windward slope.http://www.gyqx.ac.cn/EN/10.7522/j.issn.1000-0534.2022.00096qilian mountain precipitationwrf numerical simulationdifferent scalesformation mechanism |
| spellingShingle | Qiang JIANG LinBo WEI Chao LI Yan LI HongYu WANG Numerical Simulation and Diagnosis of a Precipitation in Qilian Mountains under the Coupling of Upper and Lower Systems Gaoyuan qixiang qilian mountain precipitation wrf numerical simulation different scales formation mechanism |
| title | Numerical Simulation and Diagnosis of a Precipitation in Qilian Mountains under the Coupling of Upper and Lower Systems |
| title_full | Numerical Simulation and Diagnosis of a Precipitation in Qilian Mountains under the Coupling of Upper and Lower Systems |
| title_fullStr | Numerical Simulation and Diagnosis of a Precipitation in Qilian Mountains under the Coupling of Upper and Lower Systems |
| title_full_unstemmed | Numerical Simulation and Diagnosis of a Precipitation in Qilian Mountains under the Coupling of Upper and Lower Systems |
| title_short | Numerical Simulation and Diagnosis of a Precipitation in Qilian Mountains under the Coupling of Upper and Lower Systems |
| title_sort | numerical simulation and diagnosis of a precipitation in qilian mountains under the coupling of upper and lower systems |
| topic | qilian mountain precipitation wrf numerical simulation different scales formation mechanism |
| url | http://www.gyqx.ac.cn/EN/10.7522/j.issn.1000-0534.2022.00096 |
| work_keys_str_mv | AT qiangjiang numericalsimulationanddiagnosisofaprecipitationinqilianmountainsunderthecouplingofupperandlowersystems AT linbowei numericalsimulationanddiagnosisofaprecipitationinqilianmountainsunderthecouplingofupperandlowersystems AT chaoli numericalsimulationanddiagnosisofaprecipitationinqilianmountainsunderthecouplingofupperandlowersystems AT yanli numericalsimulationanddiagnosisofaprecipitationinqilianmountainsunderthecouplingofupperandlowersystems AT hongyuwang numericalsimulationanddiagnosisofaprecipitationinqilianmountainsunderthecouplingofupperandlowersystems |