WEI Yongheng,FAN Guangzhou.Day and Night Comparison Analysis of the Effect of Soil Moisture on a Case of Convective Precipitation over Qinghai-Tibetan Plateau[J].Journal of Chengdu University of Information Technology,2020,35(01):96-103.[doi:10.16836/j.cnki.jcuit.2020.01.013]
青藏高原土壤湿度对一次对流降水影响的昼夜对比分析
- Title:
- Day and Night Comparison Analysis of the Effect of Soil Moisture on a Case of Convective Precipitation over Qinghai-Tibetan Plateau
- 文章编号:
- 2096-1618(2020)01-0096-08
- Keywords:
- meteorology; numerical simulation; Qinghai-Tibetan Plateau; soil moisture; convective precipitation; day and night contrast
- 分类号:
- P435+.1
- 文献标志码:
- A
- 摘要:
- 为了研究青藏高原土壤湿度与降水的反馈机制,使用WRF模式对2014年8月6-9日青藏高原对流降水过程进行模拟和敏感性实验。结果表明,控制实验能较好地模拟本次降水。土壤湿度增加会使白天降水量减少,夜间降水量增加。土壤湿度增大使白天地表温度增温更慢,地表温度降低,地表感热通量减少,使对流层内不稳定能量减少,使垂直气流和辐合辐散强度降低,对流强度减弱,产生负反馈,使白天降水量减少; 而夜间地表温度降温更慢,地表温度更高,使对流层内不稳定能量增加,使垂直气流和辐合辐散强度增加,对流强度增加,产生正反馈,使夜间降水量增加。且土壤湿度增加越多,白天负反馈越强,降水减少越多; 夜间正反馈越强,降水增加越多。
- Abstract:
- In order to study the feedback mechanism of soil moisture and precipitation in the Qinghai-Tibetan Plateau, the simulation and sensitivity test of convective precipitation process of the Qinghai-Tibetan Plateau from 6 to 9 August 2014 were carried out by using WRF model.The results show that the precipitation can be well simulated by the control experiment. The amount of the precipitation will be reduced in daytime while it will be increased in nighttime as a result of the increase of soil moisture. The increase of soil moisture will reduce the amount of precipitationin the daytime and increase the amount of precipitation at night.The increase of soil moisture slows the increase ofthe surface temperature at daytime,lowers the temperature of the surface,decreases the surface sensible heat flux, and reduces the unstable energy in the troposphere.It also reduces the intensity of the vertical airflow, the convergence and the divergence, and weakens the convection intensity, which in return form a negative feedback that reduces the amount of precipitation in the daytime.In the nighttime, the surface temperature is reduced more slowlyand is higher than in daytime, as a result, the unstable energy in the troposphere is increased, the intensity of the vertical airflow and theconvergence and the divergence are increased, hence the convection intensity is increased, whichin returnproduces a positive feedback effect thatincrease the amount of precipitation at night.In general,the more soil moisture increases, the stronger negative feedbackwill be and the more the precipitation will decreaseduring the day.Similarly, the stronger positive feedbackisat night, the more precipitation increases.
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备注/Memo
收稿日期:2019-06-11基金项目:国家自然科学基金资助项目(91537214); 国家重点研发计划资助项目(2018YFC1505702); 公益性(气象)行业科研专项资助项目(GYHY201506001)