Measurements of sulfur dioxide and ozone dry deposition over short vegetation in northern China - A preliminary study
Measurements of sulfur dioxide and ozone dry deposition over short vegetation in northern China - A preliminary study
复制标题
DOI：
10.1016/s1352-2310(03)00180-8
复制
发表时间：
2003-07-01
影响因子：
5
通讯作者：
Quan, H
中科院分区：
文献类型：
--
作者：
Sorimachi, A;Sakamoto, K;Quan, H
在北京郊区的一个短草覆盖的农田上，于夏末冬初观测了SO2和O-3的干沉降通量。作为获取中国北方干沉降信息的初步尝试。测量是基于微气象梯度法，只分析了符合中性大气稳定度的数据，因为我们收集的数据不足以将分析扩展到其他稳定度情况。根据一些选择标准进一步筛选数据，以确保其可信度。对于选定的时间段V-d（沉积速度）的SO2表现出最大值在上午和下午的最小值，在这种行为几乎没有季节依赖性。夏末和初冬的平均（标准差）V-d分别为0.2（+/-0.1）cm s（-1）和0.4（+/-0.2）cm s（-1）。Vd的日变化基本上受R-a（空气动力阻力）+ R-b（准层流边界层阻力）的影响，其日变化明显大于R-c（冠层阻力）。在夏末和初冬，O-3的平均（+/-标准差）V-d分别为0.2（+/-0.2）cm s（-1）和0.4（+/-0.3）cm s（-1），因此与SO2的V-d基本相同。O-3Vd的变化在性质上与SO2的变化相似，但在这种情况下，R-c与R-a + R-b相当或大于R-a + R-b。小明显的季节性依赖是明显的O-3沉积，无论是。一种趋势是明显的R-C增加在下午，这可能是由于气孔导度下降，由于增加蒸汽压赤字和/或温度上升。(C)2003爱思唯尔科技有限公司版权所有。
We measured dry deposition fluxes Of SO2 and O-3 Over a field covered mostly with short grass in a suburb of Beijing during late summer and early winter. as an initiatory attempt to obtain information on dry deposition in northern China. The measurement was based on a micrometeorological gradient method, and only the data conforming to neutral atmospheric stability were analyzed because the data we collected were not adequate to extend the analysis to other stability cases. The data were further screened out according to a few selection criteria to ensure their credibility. For the selected periods V-d (deposition velocity) of SO2 showed a maximum in the morning and a minimum in the afternoon, with little seasonal dependence in this behavior. The mean ( standard deviation) V-d was 0.2 (+/-0.1) cm s(-1) in late summer and 0.4 (+/-0.2) cm s(-1) in early winter. The diurnal variation of Vd seemed to be more or less governed by that of R-a (aerodynamic resistance) + R-b (quasi-laminar boundary layer resistance), which was considerably larger than R-c (canopy resistance). The mean (+/-standard deviation) V-d Of O-3 was 0.2 (+/-0.2) cm s(-1) in late summer and 0.4 (+/-0.3) cm s(-1) in early winter, thus much the same as those for SO2. The variation Of O-3 Vd was qualitatively similar to that of SO2, but in this case R-c was comparable to or larger than R-a + R-b. Little distinct seasonal dependence was evident for O-3 deposition, either. A tendency was discernible for R-c to increase in the afternoon, which was probably caused by a decline in stomatal conductance due to an increase in vapor pressure deficit and/or a rise in temperature. (C) 2003 Elsevier Science Ltd. All rights reserved.