现场大气稳定度分类方法探讨
INVESTIGATION OF ON-SITE ATMOSPHERIC STABILITY CALSSIFICATION METHODS
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摘要: 大气稳定度是反映湍流活动的主要指标,恰当地选择大气稳定度分类方法是大气环境影响评价的基本问题之一。目前国内最常用的P-C法1(根据P-T法修改成适合我国应用的形式)有较强的经验性,分类精度不高。大气稳定度实质上是大气热力和动力过程对湍流产生、发展或抑制能力的一种客观量度,因此理查逊数和莫宁-奥布霍夫长度等指标将比P-C法能更客观地表征大气稳定度状况2。本文利用野外实测资料,给出总体理查逊数划分大气稳定度级别的方法和标准,以及不同分类方法结果比较。Abstract: In this paper, the bulk Richardson number,RiB, for dividing atmospheric stability classifications is introduced.Because of considering quantitatively heating and mechanical factors, it is better than P-C method for determining atmospheric stability classifications.