摘要
本工作用梯度法测定了大气与其下垫的森林间ＣＯＳ的交换通量。测量在德国哥廷根大学的一座５０ｍ高的森林观测塔上进行，该塔坐落在德国中部的Ｓｏｌｌｉｎｇ自然保护区的森林中。观测现场生长着树龄分别为１２０ａ和８０ａ的山毛榉和云杉。树冠线约２８ｍ高。在塔上离地面３２ｍ，３８ｍ和５０ｍ的地方用冷以法同时采集了空气样品。样品用气相色谱－火焰光度检测法测定。ＣＯＳ通量由其梯度及扩散系数求出。扩散系数由与ＣＯＳ一起测得的感热和水蒸气通量导出。在稳定边界层条件下共获得２０条廓线。每条廓线都显示ＣＯＳ浓度随高度下降而降低的趋势，说明森林吸收ＣＯＳ。总的结果表明，ＣＯＳ向森林中的平均输送通量为（１４３±５４）ｎｇＣＯＳｍ－２·ｓ－１．
he flux of carbonyl sulfide between the atmosphere and the underlying forest hasbeen measured by a flux-gradient technique on the 50m tower of the forestry faculty ofthe University of Goettingen in the Natural Reserve Solling in Central Germany. Thesite is covered by beech and spruce of 120 and 80 years of age, respectively. The canopyheight is around 28 meters. Carbonyl sulfide was sampled simultaneously at 32, 38 and50m above the ground by cryo-trapping over 10min intervals. Samples were analyzed byGC/FPD. Fluxes of COS above the forest were derived from COS gradients and diffusivities of heat and water vapor. Diffusivities were derived from gradients and fluxes ofheat and water vapor measured simultaneously with COS. Twenty sets of profiles havebeen obtained during daytime under stable boundary layer conditions. Each of the individual profiles showes a decrease of COS towards the top of the canopy that exceeds theanalytical uncertainty of the measurement. indicating uptake of COS by the forest. Anaverage COS flux of - (143±54) ng COSm-2· s-1 have been obtained.
出处
《气象学报》
CSCD
北大核心
1996年第3期357-364,共8页
Acta Meteorologica Sinica
