Based on the observational data of Large Aperture Scintillometer(LAS) and Eddy-covariance System (EC) from Dali National Climate Observatory, the structure parameter of the refractive index of air (Cn2) between LAS and EC measurement was analyzed.The results show that there was a very good correlation between logCn2 values measured by two kinds of instruments with the correlation coefficient up to 0.73.The values of Cn2 measured by LAS lay between 10-17 and 10-14 m-2/3, and measured by EC lay between 10-16 and 10-13 m-2/3.The diurnal variations of Cn2 were evident and the values of Cn2 reached the maximum in the afternoon and the minimum in the sunrise and sunset for a clear, cloudy and overcast day in paddy field covered with vegetation and dry land covered with no vegetation.The diurnal variation tendency of Cn2 measured by EC and LAS were consistent.However, the most values of Cn2 measured by EC were 1 hour order bigger in magnitude than measured by LAS due to the effects of installation height, measurement method, noise level of electronics, sky condition, wind speed and direction, net radiation fluxes, atmospheric stability and so on, wherein the installation height was the major factor.
XU Anlun
,
PENG Hao
,
DONG Baoju
. Comparison of Large Aperture Scintillometer and Eddy-Covariance System Measurements with Structure Parameter of Refractive Index of Air[J]. Plateau Meteorology, 2015
, 34(4)
: 935
-941
.
DOI: 10.7522/j.issn.1000-0534.2014.00104
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