PROGRESS IN GEOGRAPHY ›› 2012, Vol. 31 ›› Issue (5): 602-608.doi: 10.11820/dlkxjz.2012.05.008

• Original Articles • Previous Articles     Next Articles

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

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