西双版纳热带季节雨林大气稳定度特征

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.

Characteristics of atmospheric stability at the boundary of atmosphere-tropical seasonal rainforest canopy in Xishuangbanna of Southwest China

Based on the routine observation data and eddy correlation data in 2003-2005, this paper analyzed the frequency distribution of atmospheric stability at the boundary of atmospheretropical seasonal rainforest canopy in Xishuangbanna of Southwest China. The atmospheric stability was estimated by Monin-Obukhov length and Bulk Richardson number, and the results showed that the change pattern of the stability estimated by the two parameters had a similar trend, but the occurrence frequency differed with atmospheric conditions. The atmospheric stability estimated by Bulk Richardson number exhibited more fluctuations in different seasons and years, compared with that estimated by Monin-Obukhov length.