Development of calibration instrument for precise stratospheric and tropospheric ozone measurement

平流层和对流层臭氧精密测量校准仪的研制

基本信息

批准号：
11680526
负责人：
KITA Kazuyuki
金额：
$ 2.5万
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：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11680526/
关键词：
ozone stratospheric chemistry tropospheric chemistry instrumentation 航空機観測

项目摘要

To investigate the ozone decrease in the lower stratosphere and ozone increase in the upper troposphere, the precision of the measurement should be improved significantly. It is crucial to calibrate instruments for ozone measurement under the low-pressure condition similar to the upper troposphere/lower stratosphere. For this purpose, we have developed an instrument for calibration of ozone monitor under low-pressure condition. At first, we used a commercial standard ozone generator as the ozone source and made a Teflon chamber with backward pressure controller to reduce the pressure of ozone from the ozone generator. However, the adjustment of the pressure of the chamber was difficult and critical although the pressure reduction was successful. Thus we have improved this system : 1) pressure-stabilize the inlet and exhaust ports of the ozone generator, 2) flow monitor from ozone generator, 3) some capillaries (instead of needle valve) are used to make pressure drop between ozone generator and the Teflon chamber, and so on. After these improvements, the developed calibration system worked stably. By comparing a precise ozone monitor, this ozone calibration system can calibrate a ozone measurement instrument with an accuracy of 3%. However, for using this system easily in the observation field, the operation should be automated.

为了研究对流层上层平流层下部和臭氧的臭氧减少，应显着提高测量的精度。在低压条件下类似于对流层/下层平流层的低压条件下，校准仪器进行臭氧测量至关重要。为此，我们开发了一种在低压条件下校准臭氧监测器的仪器。首先，我们使用了商业标准的臭氧发电机作为臭氧源，并制造了带有向后压力控制器的特氟龙腔室，以降低臭氧发电机的臭氧压力。然而，尽管减压成功，但腔室压力的调整是困难而重要的。因此，我们改善了该系统：1）压力稳定的臭氧发电机的入口和排气口，2）来自臭氧发电机的流量监视器，3）使用一些毛细管（代替针阀），以使臭氧发生器和Teflon腔室之间的压力下降。这些改进后，开发的校准系统稳定起作用。通过比较精确的臭氧监测器，该臭氧校准系统可以精确地校准臭氧测量仪器。但是，对于在观测场中轻松使用此系统，应自动化操作。