Observation of the nighttime variation of nitrogen oxides concentration in the stratosphere

平流层氮氧化物浓度夜间变化观测

基本信息

批准号：
08640555
负责人：
KITA Kazuyuki
金额：
$ 1.41万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640555/
关键词：
stratosphere ozone NOx global environment balloon observation

项目摘要

The objective of this research is a balloon observation of the nighttime variation of nitrogen oxides concentration in the stratosphere. The nighttime variation of inventory of nitrogen oxides in the stratosphere is quite significant because the heterogeneous process to convert N2O5, which is generated in the nighttime, to HNO3 in the presence of sulfuric acid aerosol is suggested to play a significant role in the ozone depletion in the lower stratosphere. For this purpose, we are developing an instrument to observe vertical distribution of NO2, NO3, ozone and aerosol by the spectroscopic method. By using blight stars as a light source, we can obtain more than 5 profiles of these species in one night. By numerical calculation, we confirm that the possibility of this observation. We have developed a star-tracker, optical system including a telescope and 6-color high-resolution photometer, signal processing electronics and data acquisition system. In the test of performance of the system, we found that the servo-control in the star-tracker was not stable enough to get good quality data. By changing servomotors with digital-controlled motors to improve stability of the star-tracker, we suppose that we can improve the instrument for the balloon experiment. However, **cause of the delay of developing and preparation of the instrument, we cannot make a balloon observation in the period of this grant-aided project research.

这项研究的目的是观察平流层氮氧化物浓度的夜间变化。平流层中氮氧化物库存的夜间变化非常重要，因为在硫酸气溶胶存在下，在夜间在夜间生成的N2O5的异质过程被认为在下层平流层的ozone耗竭中起着重要作用。为此，我们正在开发一种仪器，以通过光谱法观察NO2，NO3，臭氧和气溶胶的垂直分布。通过将枯萎星作为光源，我们可以在一个晚上获得这些物种的5个以上的轮廓。通过数值计算，我们确认了这种观察的可能性。我们已经开发了一个星形跟踪器，光学系统，包括望远镜和6色高分辨率光度计，信号处理电子设备和数据采集系统。在测试系统性能的测试中，我们发现Star-Tracker中的伺服控制不足以获得高质量的数据。通过使用数字控制的电动机更换伺服运动，以提高星形跟踪器的稳定性，我们认为我们可以改善气球实验的仪器。但是，**由于仪器开发和准备延迟的原因，我们在这项赠款项目研究期间无法进行气球观察。