【摘要】 新疆地区地处亚欧大陆腹地，气候条件干燥，水资源时空分布不均，可用水资源匮乏。湖泊是新疆水资源主要贮存方式之一，其通过多界面、多要素大气边界层物理过程调控区域水热物质交换与循环，对缓解干旱区沙漠化发挥不可或缺的作用。本文以博斯腾湖为研究对象，利用WRF-CLM模拟2020年夏季6～8月共计92 d的局地环流形势，分析近地面风场、水汽分布并结合去湖试验，获得局地环流对湖面蒸发的影响机制，具体表现为：盛行湖风时，湖面蒸发的水汽会在上岸气流的携带下向陆地输送，同时在湖风锋的上升气流影响下向高空扩散，在山谷风等背景风的综合作用下，湖风环流会携水汽下沉并聚集于湖岸形成离散分布的水汽聚集区，这些区域的比湿保持在较高水平。博斯腾湖的水汽聚集区分布于湖区西侧，这些区域具有边界层高度较周边其他陆面边界层低，下垫面多为植被覆盖等特点。更多还原

【Abstract】 Xinjiang is situated in the interior of the Eurasian continent. This region is characterized by arid climatic conditions, presenting an uneven spatial and temporal distribution of water resources, as well as a scarcity of accessible water resources. Lakes constitute one of the primary means of water resource storage in Xinjiang. They play a pivotal and irreplaceable role in combating desertification within the arid region. They modulate the regional exchange and circulation of water and heat-carrying materials through complex multi-interface and multifactor physical processes occurring within the atmospheric boundary layer. Bosten Lake in Xinjiang was the target of this study. The Weather Research and Forecasting model coupled with the Community Land Model was employed to simulate local circulation patterns over the lake for a period of 92 days from June to August 2020. By meticulously analyzing the near-surface wind fields and water vapor distribution and using lake-removal experimental setups, the mechanism underlying the influence of local circulation on the evaporation of the lake surface was revealed: Because of the lake breeze, the water vapor evaporating from the lake surface moves toward the land, driven by the onshore air currents. Concurrently, the updraft at the lake breeze front causes this water vapor to disperse into the upper atmosphere. Under the combined forces of the valley wind and background wind, the lake breeze circulation drives the water vapor downward, accumulating it along the lakeshore to form discretely scattered water vapor accumulation zones. The specific humidity within these areas persists at an elevated level. The water vapor accumulation area of Bosten Lake is predominantly distributed on the western flank of the lake.Notably, the boundary layer height in these regions is lower than that in the neighboring land surfaces, and the underlying surface is largely blanketed by vegetation.更多还原