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学科主题: 地理学::自然地理学
题名: 夏季青藏高原纳木错地区大气边界层及局地环流的观测和数值模拟
作者: 吕雅琼
答辩日期: 2008
导师: 马耀明
专业: 自然地理学
授予单位: 中国科学院研究生院
授予地点: 北京
学位: 硕士
关键词: 湖陆风 ;  山谷风 ;  探空资料 ;  MM5中尺度模式 ;  纳木错
索取号: S000008
部门归属: 图书馆
摘要: 青藏高原纳木错地区位于藏北高原东南部,湖面海拔4718 米,是我国第二大咸水湖,也是世界上海拔最高的咸水湖,这一地区涵盖了“大气-高原湖泊-冰川(雪山)-高原草甸-高原湿地”系统的各个部分,是青藏高原复杂下垫面的代表地区之一。本论文拟利用中国科学院青藏高原研究所纳木错圈层相互作用综合观测研究站在冰川(雪山)、高原草甸、湿地及湖泊等不同下垫面上设置的观测仪器,通过同步野外观测试验、观测资料分析和数值模拟相结合的方法,研究青藏高原纳木错地区“大气-高原湖泊-冰川(雪山)-高原草甸-高原湿地”系统大气边界层特征以及该系统内冰川风、山谷风和湖陆风等局地环流的变化特征。本论文主要包括观测和数值模拟两个方面的内容。首先我们利用纳木错圈层相互作用综合观测研究站5个测站的地面观测资料,包括纳木错站的边界层塔和通量观测仪以及周围四个自动气象站(保吉站、北坡站、垭口站、南坡站),分析了纳木错大气边界层内各要素(气温、比湿、感热、潜热等)和局地环流(湖陆风、山谷风)的日变化特征。为了更为详尽的说明局地环流的高空分支以及大气边界层垂直结构,我们于2007年8月8日到19日进行了为期12天的纳木错圈层相互作用综合观测研究站首次探空观测,通过留气球低探空和GPS无线电探空两种设备,我们得到了包括大气边界层及对流边界层顶部的探空资料,并利用这些资料分析了纳木错湖区大气边界层高度、气温、比湿等要素的垂直结构,同时结合地面观测,着重分析了湖陆风环流的高空表现。虽然对地面和高空观测资料的分析是比较真实的结果,可这只能代表“点”上的情况,而且我们也无法观测资料的分析中看出纳木错湖的存在对该地区的影响,为此我们使用美国NCAR新版MM5V3.7非静力模式,采用三重嵌套方法,设计了有湖、3/4湖、1/2湖、无湖四组试验,对比研究了西藏纳木错湖区域的局地环流及大气边界层特征,并以中国科学院纳木错综合观测站观测资料为真值,对模拟结果进行了验证,结果显示模式在风场和气温的模拟方面取得了很好的结果。
英文摘要: Located in the southeastern of Tibetan Plateau, Lake Nam Co is the second largest inland salty lake of China with elevation of 4718 meters, and also the highest salty lake of the world. The area is typically complex terrain and heterogeneity surface of Tibetan Plateau, which included a variety of lake, meadow, marsh, glacier, and crop. The aim of this paper is using the observation data from Nam Co comprehensive station and numerical simulation to reveal the characteristics of atmospheric boundary layer, as well as lake breeze, mountain-valley wind, under a complex system which contains the atmosphere - highland lakes - Glaciers (Snow Mountain) - highland meadow - the plateau wetland. Both observations and numerical simulation used to investigate the characteristic of atmosphere boundary layer and local circulation over Lake Nam Co. Firstly, using the ground observation data from five sites of Nam Co comprehensive observation station, including boundary tower and flux instrument and the four surrounding automatic weather stations (Baoji site, the North Slope site, Yakou site, the Southern Slope site ), we analyzed the characteristic of atmospheric boundary layer (e.g. temperature, specific humidity, the sensible heat flux and latent heat flux, etc.) and local circulation (e.g. Lake- Land wind, Valley Wind). In order to reveal the vertical structure of atmospheric boundary layer and the wind distribution in the upper layer, we carried the first sounding observation over Lake Nam Co area from 8 to 19 August 2007 through thermal sounding and GPS radio equipment. We analyzed the atmospheric boundary layer height, air temperature, mix vapor ratio, and the performance of local circulation in the upper layer. Although the observation analyses show the real situation, they are just the point results which can not represent the whole area situation. Moreover, observation analyses can not show the importance of the existence of lake Nam Co. Thus, four set of triple simulations which include with lake simulation, 3/4 lake simulation,1/2 lake simulation, without lake simulation were conducted by using NCAR non-hydrostatic meso-scale model (MM5V3.7) as an expansion of observation analysis. The characteristics of surface temperature, atmospheric boundary layer height, sensible heat flux, and latent heat flux were analyzed. The vertical circulation, land-lake breeze, mountain-valley winds were also simulated. The modeled results were validated by the observations. The wind and temperature simulation show good corresponding with observation.
语种: 中文
内容类型: 学位论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/1201
Appears in Collections:图书馆_学位论文

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Recommended Citation:
吕雅琼.夏季青藏高原纳木错地区大气边界层及局地环流的观测和数值模拟[硕士].北京.中国科学院研究生院.2008
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