doi:  10.3878/j.issn.1006-9895.1701.16205
2014年夏季青藏高原狮泉河与林芝降水低频振荡及陆气过程日变化特征

The Low Frequency Oscillation of Precipitation and Characteristics of Air-Land Process Daily Variation in Shiquanhe Station and Linzhi Station over Tibetan Plateau in the summer of 2014
摘要点击 1898  全文点击 69  投稿时间:2016-08-02  最后修改时间:2016-11-16
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基金:  Funded by National Key Basic Research Program (Grants 2015CB453202, 2014CB953902),National Natural Science Foundation of China (Grants 91337216, 41305065);国家重点基础研究规划项目;国家自然科学基金
中文关键词:  青藏高原 低频振荡 近地面层 日内变化 湍流
英文关键词:  Tibetan Plateau, Low frequency oscillation, Surface layer, Diurnal variation, Turbulence
           
作者中文名作者英文名单位
段丽君duanlijun成都信息工程大学大气科学学院;中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室LASG
段安民duananmin中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室LASG
胡文婷huwenting中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室LASG
巩远发gongyuanfa成都信息工程大学大气科学学院
引用:段丽君,段安民,胡文婷,巩远发.2017.2014年夏季青藏高原狮泉河与林芝降水低频振荡及陆气过程日变化特征[J].大气科学
Citation:duanlijun,duananmin,huwenting,gongyuanfa.2017.The Low Frequency Oscillation of Precipitation and Characteristics of Air-Land Process Daily Variation in Shiquanhe Station and Linzhi Station over Tibetan Plateau in the summer of 2014[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      根据“第三次青藏高原大气科学试验”2014年7、8月青藏高原西南部狮泉河站、东南部林芝站的3m涡动相关系统原始数据和10Hz湍流资料、中国气象局台站观测资料、JRA-55逐日再分析资料、GPCP全球降水逐日观测资料,分别讨论了这两个站在10~20天低频振荡的天气背景下其干湿位相近地层气象要素的日变化特征以及湍流变化特征。结果表明:两站高低空环流场、水汽通量场、热源的10~20d低频分量在其干、湿位相期间的配置相反。低频地表感热和潜热的不同变化对降水的影响分别在高原西部和东部有不同表现。狮泉河站的低频振荡在纬向上自西向东传播,而林芝站的低频振荡在纬向上自东向西传播,结果表明这两个站分别存在两种不同起源的低频振荡。两站干湿位相的近地面气象要素以及湍流通量具有明显的日变化特征,通常温度极大值出现在午后14时,但狮泉河站干湿位相的温度极大值均出现在夜间20时;由波文比可知,狮泉河站湿位相全天以潜热为主导,干位相期间,北京时06时之前潜热为主,06时之后以感热为主;林芝站干湿位相均为08时之前以感热为主,08时之后以潜热为主。两站湍流平均动能与平均风速正相关,垂直动量表现为向下传输,热量和水汽表现为向上传输。
Abstract:
      Through the original data of 3m eddy correlation system and 10Hz turbulence data obtained in Shiquanhe station and Linzhi station which respectively located in southwest and southeast of Tibetan Plateau area based on “The 3rd Tibetan Plateau atmospheric scientific experiment”、station observation data provided by China Meteorological Administration、JRA-55 and GPCP daily Reanalysis data in July and August of 2014, study is performed on the diurnal variations of surface layer meteorological elements and turbulent changes under the background of 10~20-day low frequency oscillation in two stations,respectively. The results are shown as follows:the 10~20-day low frequency component of high and low circulation fields、water vapor fields and heat sources in the two stations are opposite during its dry or wet phase. The different variation of low frequency surface sensible/latent heat flux have influence on precipitation,this influence has different performances in west and east Plateau,respectively. The low frequency oscillation of Shiqianhe station is propagates from west to east,but in Linzhi station propagating from east to west. Thus,there are two kinds of different origins of low frequency oscillations. Surface layer meteorological elements and turbulent flux have obvious diurnal variation in the dry and wet phases. Usually,the highest temperature appeared at two o ''clock in the afternoon,but in the dry and wet phase of Shiquanhe station,it appeared at eight o ''clock in the evening. From Bowen ratio,we can see that in Shiquanhe station wet phase dominated by latent heat throughout the day,dry phase dominated by latent heat before 6 a.m. and takes a leading by sensible heat after 6 a.m.. In Linzhi station,wet and dry phase are all lead by sensible heat before 8 a.m. and dominated by latent heat after 8 a.m.. The average kinetic energy of turbulence and average wind speed are positive correlation in two stations,the vertical momentum is transported downward,heat and moisture are upward.
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