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利用2003—2005年西双版纳热带季节雨林林冠上方的常规观测资料和涡度相关观测资料,对树冠边界层的大气稳定度频率分布进行了分析。分别计算了近地层尺度参数和理查逊数,并根据结果对大气稳定度类型进行了划分,分析了大气稳定状态的时间变化,对2种方法得到的结果进行了对比分析,结果表明:2种不同方法计算的稳定度变化趋势是一致的,但不同状态出现频次有所不同;相对于近地层尺度参数法,理查逊数法计算的大气稳定度季节变化和年际变化均较明显,而近地层尺度参数法则未表现出明显波动。
Based on the conventional observation data above the canopy of tropical seasonal rainforest in Xishuangbanna from 2003 to 2005 and the eddy covariance observation data, the frequency distribution of atmospheric stability in the boundary layer of the canopy was analyzed. Based on the results, the types of atmospheric stability are divided, and the time variation of the atmospheric steady state is analyzed. The results of the two methods are compared and analyzed. The results show that: 2 The stability trends of different kinds of methods are consistent, but the frequency of occurrence of different states is different. Compared with the stratospheric scale parameter method, the seasonal variation and interannual variation of atmospheric stability calculated by Richardson number method are all obvious, However, the law of scale parameter in the near-surface layer shows no obvious fluctuation.