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RADIATION BALANCE AND TURBULENT FLUX CHARACTERISTICS OVER MIZUHO STATION IN ANTARCTICA 总被引:1,自引:0,他引:1
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In this paper,by using measurements in micrometeorology and radiation balance in the surface layer(Yamanouchiet al.,1981;Wada et al.,1981;Ishikawa et al.,1982;Ohata et al.,1983),we have analyzed the diurnal and annual varia-tion characteristics of radiation balance in spring,summer,autumn and winter,and calculated the momentum flux andsensible heat flux with the aerodynamic method and profile gradient alternate method in different seasons.We have alsoobtained the diurnal variation characters of the latent heat flux from the equation for energy balance.The results fromthe calculation are compared.Finally,the relationship between the turbulent heat and momentum exchange coefficientand the diurnal variation of the Richardson number is discussed. 相似文献
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流场如何适应非均匀地表面是微气象学的一个重要问题。本文通过建立一个包含地面过程参数化和水温预报方案的非静力平衡中小尺度数值模式来研究过水体气流流速改变的空间结构和变化规律。结果表明:由于水体使表面粗糙度有脉冲式跃变,当较强气流流过时,形成两个内边界层,这两个内边界层在空间交汇呈“舌状”分布,在此之内流速增大,并且地面粗糙度愈大,流速增大愈多。大气层结明显地影响过水体气流流速的改变,造成流速改变有明显的日变化和季节性变化。过水体气流流向改变不大。 相似文献
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According to the observation of the number and mass concentration spectra of atmosphericaerosols,the total suspended particulates (TSP) and their size distribution,micrometeorology,and the solar spectroscopic radiation,even neutron activation treatment of sand dust samples inHelan Mountainous area.the formation law of floating dust,blowing sand and sandstorm weatherand the characteristics of climatic variation in this area and the influence of the Helan Mountain arecounted and analyzed.In addition,the spectrum characteristics,optical depth and chemicalcomposition of sand aerosol particles are also analyzed and discussed. 相似文献
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高山草甸下垫面夏季近地层能量输送及微气象特征 总被引:8,自引:5,他引:3
利用青藏高原东坡理塘站2007年6~8月的观测资料, 分析了高原东坡草甸下垫面夏季近地层气象要素和湍流通量日变化特征, 并用涡动相关法估算地面的曳力系数。结果表明: 水平风速、 动量通量、 摩擦速度等均在下午最大, 早晨最小。二氧化碳浓度表现为早晚高、 中午低的日变化特征, 比湿的最大值出现在早晨。地表辐射、 热量平衡各分量最高值出现在中午, 最低值出现在早晨。地表反照率表现出早晚高中午低的 “U” 型分布, 日平均值为0.164。夏季地面热源强度在白天午后表现为强的热源, 在夜里表现为弱的冷、 热源交替出现。夏季近地层地气热量交换中, 感热输送作用小, 潜热输送占主要地位。 相似文献
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According to the observation of the number and mass concentration spectra of atmosphericaerosols,the total suspended particulates (TSP) and their size distribution,micrometeorology,and the solar spectroscopic radiation,even neutron activation treatment of sand dust samples inHelan Mountainous area.the formation law of floating dust,blowing sand and sandstorm weatherand the characteristics of climatic variation in this area and the influence of the Helan Mountain arecounted and analyzed.In addition,the spectrum characteristics,optical depth and chemicalcomposition of sand aerosol particles are also analyzed and discussed. 相似文献
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Micrometeorologists have traditionally used the framework of the ensemble mean, fluctuating decomposition in studying turbulence spectra, Reynolds-flux budgets, surface-exchange relations, and the universal functions of Monin-Obukhov similarity within the constant-flux layer. More recently, the growth in supercomputers and computational fluid dynamics has stimulated micrometeorological applications of large-eddy simulation (LES). LES uses a different framework, one based on the resolvable, subgrid-scale decomposition. This framework shift seems to have weakened the vital and historically strong coupling between experimental and computational work in micrometeorology. A challenge for experimentalists today is to address problems posed in the language of the resolvable, subgrid-scale decomposition. We illustrate by discussing measurement strategies for resolvable-scale turbulence fields and for local surface-exchange coefficients. 相似文献