地理科学进展 ›› 2012, Vol. 31 ›› Issue (5): 602-608.doi: 10.11820/dlkxjz.2012.05.008

• 气候变化 • 上一篇    下一篇

鄂陵湖湖滨地区夏季近地层微气象特征与碳通量变化分析

李照国1,2, 吕世华1, 奥银焕1, 王少影1,2   

  1. 1. 中国科学院寒区旱区环境与工程研究所寒旱区陆面过程与气候变化重点实验室, 兰州730000;
    2. 中国科学院研究生院, 北京100049
  • 收稿日期:2011-10-01 修回日期:2012-02-01 出版日期:2012-05-25 发布日期:2012-05-25
  • 作者简介:李照国(1985-),男,河南洛阳人,硕士研究生,主要从事大气边界层观测与模拟研究。E-mail:lzgnuist@163.com
  • 基金资助:

    国家重点基础研究发展计划(973 计划)项目(2010CB950503);国家自然科学基金项目(41130961);中国科学院寒旱区陆面过程与气候变化重点实验室开放基金项目(LPCC201101);中国科学院" 西部之光" 博士资助项目(29Y128871)。

Analysis of Micrometeorology and CO2 Flux Characteristics over Lake Ngoring Lakeside Region in Summer

LI Zhaoguo1,2, LÜ Shihua1, AO Yinhuan1, WANG Shaoying1,2   

  1. 1. Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions,Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou, 730000, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2011-10-01 Revised:2012-02-01 Online:2012-05-25 Published:2012-05-25

摘要: 利用2010 年夏季鄂陵湖湖滨地区试验观测资料, 从中选取资料较好的5 个连续晴天, 分析了该地区高寒草甸夏季局地气候、辐射与能量平衡特征以及碳通量的日变化。结果表明:①夏季晴天湖滨地区近地层气象要素受到湖陆风的较大影响, 风向昼夜交替变化, 垂直风速和摩擦速度明显大于玛曲草原, 全天盛行上升气流, 昼夜温差较小;②湖滨地区日均太阳总辐射与净辐射高于玛曲草原和金塔绿洲, 地表能量不平衡现象较显著, 湍流输送以潜热为主, 夜间近地层存在明显的逆温和逆湿现象;③夏季湖滨草甸碳吸收的日最大值出现在上午11 时前后, 碳吸收显著大于碳排放, 其水分利用效率与海北草甸生态系统接近, 总体偏低。

关键词: 鄂陵湖, 湖泊效应, 黄河源区, 能量平衡, 碳通量

Abstract: In this paper, by using the measured data observed in Lake Ngoring lakeside region during the summerof 2010, five fine days with continuous and integrated data are selected, and then their characteristics of dailyvariations of the surface radiation and energy budget and CO2 flux and microclimate are analyzed over thehigh-cold meadow vegetation ecosystem in summer. The main conclusions can be drawn as follows. (1) For fine summer weather, the characteristics of micrometeorology are significantly affected by the lake breeze in lakeside region, not only the wind direction changes alternately but also the difference in temperature is relatively small between day and night. In addition, the updraft prevails in lakeside region, and the vertical wind speed andthe friction velocity are much greater than those in Maqu grasslands. (2) The daily mean values of solar radiationand net radiation are larger than those in Maqu grasslands and Jinta oasis. As to the energy budget, the latentflux is significantly higher than the sensible flux, and the energy imbalance is large in the observation. There aredistinct temperature inversion and humidity inversion phenomena in the surface layer at the night. (3) The maximum value of carbon absorption usually is observed at about 11o’clock every morning over the meadow in lakeside region, and carbon absorption is significantly more than carbon emission. In terms of the water use efficiency(WUE), it is small, which is similar to that in Haibei meadow.

Key words: CO2 flux, energy budget, lake effect, Lake Ngoring, the source region of Yellow River