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Study on Ozone Related Atmosheric Minor Constituents with Tunable Diode Laser Heterodyne Spectroscopy

可调谐二极管激光外差光谱法研究臭氧相关大气微量成分

基本信息

批准号：
01460059
负责人：
FUKUNISHI Hiroshi
金额：
$ 3.84万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

1. Improvement of laser heterodyne spectrometer and validity of observation results(1) Signal-to-noise ratio of the laser heterodyne spectrometer with a tunable diode laser as a local oscillator has been improved to a level of greater than 1000 for an observation time of less than 1 hour. This made it possible to reduce the lower limit of the altitude range for ozone observation from 10km in the past to 7km.(2) Concurrent observations of the altitude profile of ozone with the laser heterodyne spectrometer and an ozonesonde have been performed for 4 times. Validity of the laser heterodyne measurements was confirmed from the good agreement in the results obtained by the two methods.(3) Long-term comparison in total ozone amounts obtained from laser heterodyne measurements and those from Dobson spectrophotometer measurements made at Sapporo and Tateno showed validity of the laser heterodyne results.2. Observation results for ozoneOzone observations were performed for 79 days in 1989 fiscal year and 68 days in 1990 fiscal year. Seasonal variations in total ozone which have a maximum in spring and minimun in autum, and large day-to-day variation in early spring were obtained. Increase of ozone mixing ratio has been sometimes observed around tropopause altitude. Comparison between the observed profiles of ozone mixing ratio and potential vorticities calculated from meteorological sonde data showed that the correlation between the two values is as high as 0.944, and that the increase of ozone around the tropopause is caused by flowing ozone rich stratospheric air into the tropospnere associated with tropopause folding.

1.激光外差光谱仪的改进及观测结果的有效性（1）用可调谐半导体激光器作为本振源的激光外差光谱仪，在观测时间小于1小时的情况下，信噪比已提高到大于1000的水平。这使得臭氧观测高度范围的下限从过去的10公里降低到7公里成为可能。(2)用激光外差光谱仪和臭氧探空仪进行了4次臭氧高度廓线的同步观测。激光外差测量的有效性得到证实，从两种方法得到的结果的良好协议。(3)通过对激光外差法和多布森分光光度计在札幌和Tateno的测量结果进行长期比较，证实了激光外差法测量结果的有效性. 1989财政年度进行了79天的臭氧观测，1990财政年度进行了68天的臭氧观测。臭氧总量的季节变化特征是春季最大，秋季最小，早春日变化较大。在对流层顶附近，有时可以观测到臭氧混合比的增加。将观测到的臭氧混合比廓线与由气象探空资料计算的位涡廓线进行比较，发现两者之间的相关系数高达0.944，对流层顶附近臭氧的增加是由于平流层中富含臭氧的空气流入对流层而引起的，而对流层顶的折叠则与之有关。