| 大理苍山—洱海局地环流的数值模拟 |
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| 引用本文： | 许鲁君,刘辉志,曹杰.大理苍山—洱海局地环流的数值模拟[J].大气科学,2014,38(6):1198-1210. |
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| 作者姓名： | 许鲁君 刘辉志 曹杰 |
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| 作者单位： | 1.中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室, 北京100029;云南大学大气科学系, 昆明650091 |
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| 基金项目： | 国家自然科学基金项目41030106,中国科学院战略性先导科技专项项目XDA05110102 |
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| 摘 要： | 利用耦合了湖泊模型的WRF_CLM模式模拟了秋季大理苍山—洱海地区的局地环流特征。结果表明:模式对近地面温度、风向、风速的模拟与观测基本一致,模拟结果能较好地再现该地区山谷风和湖陆风相互作用的局地环流特征。在秋季,大理苍山的谷风起止时间为08:00~17:00(北京时,下同),湖风起止时间为09:00~19:00。局地环流受高山地形及洱海湖面影响明显,山谷风形成早于湖陆风1 h,夜间山风、陆风强盛于白天谷风、湖风。白天苍山谷风与洱海湖风的叠加作用会驱动谷风到达2600 m的高度,而傍晚最先形成的苍山山风则会减弱洱海的湖风环流。夜间盆地南部在两侧山风、陆风的共同作用下,形成稳定而持续的气旋式环流。日出以后,对流边界层迅速发展,边界层高度逐渐增高。陆地17:00温度达到最高,边界层高度也达到峰值2000 m,之后逐渐降低。日落后形成稳定边界层,边界层高度在夜间基本保持在100 m。相对于陆地,湖面白天边界层高度低300 m,夜间边界层高度高100 m。
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| 关 键 词： | WRF_CLM模式 湖陆风 山谷风 局地环流 |
| 收稿时间： | 2013/10/24 0:00:00 |
| 修稿时间： | 2014/1/15 0:00:00 |
Numerical Simulation of Local Circulation over the Cangshan Mountain-Erhai Lake Area in Dali, Southwest China |
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| XU Lujun,LIU Huizhi and CAO Jie.Numerical Simulation of Local Circulation over the Cangshan Mountain-Erhai Lake Area in Dali, Southwest China[J].Chinese Journal of Atmospheric Sciences,2014,38(6):1198-1210. |
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| Authors: | XU Lujun LIU Huizhi and CAO Jie |
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| Institution: | 1.State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;Department of Atmospheric Sciences, Yunnan University, Kunming 6500912.State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 1000293.Department of Atmospheric Sciences, Yunnan University, Kunming 650091 |
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| Abstract: | The characteristics of local circulation in autumn over Cangshan Mountain-Erhai Lake in Dali were simulated using the WRF_CLM model, which includes a lake module. Simulated near-surface temperature, wind speed, and wind direction by the WRF_CLM model show good agreement with the observation data. In autumn, valley breezes start at 0800 BT (Beijing Time) and end at 1700 BT, while lake breezes last from 0900 BT to 1900 BT. The local alp terrain and Erhai Lake have a large impact on the local circulation. Starting time of the mountain-valley breeze is 1 hour earlier than that of the lake-land breeze. Mountain and land breezes at night are stronger than valley and lake breezes in daytime. Valley and lake breezes cooperate, reaching up to 2600 m in height during the day, while lake-land circulation is weakened by mountain breezes from Cangshan at dusk. A cyclonic circulation is maintained by the combination of mountain breeze and land breeze in the south of the basin at night. The convective boundary layer develops quickly after sunrise, and reaches a peak height of 2000 m at 1700 BT, then decreases to 100 m at night over the land surface. The boundary layer height over the lake surface is 300 m lower at daytime than over the land surface and 100 m higher at night. |
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| Keywords: | WRF_CLM model Lake-land breeze Mountain-valley breeze Local circulation |
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