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[O07-P68] Bad visibility in the past at Tachikawa High School
Keywords:visibility , meteorological, air pollution
Transitions of visibility in the past for 10years in TachikawaVisibility is a meteorological term indicating the distance with which an object can be identified from the observation site and is information to measure how far we can see.
It is used as an indicator of air pollution.
Tachikawa high school astronomy meteorological club have been observing visibility for about 70 years since the 1950s.
A senior of the club conducted a survey focused on visibility and analyzed data.
The results show the condition of visibility was very bad in Tachikawa in the past.
In this study, the cause of visibility was investigated by comparing the data of visual range data for about 10 years from 1957 when visibility was the worst with recorded meteorological phenomena (smoke, haze, fog, inversion layer, and wind dust).
For the survey, we used monthly reports written in the past and interviewed our alumni.
The data of visibility showed that visibility tended to be poor in winter especially in the morning and phenomena such as soot, haze and inversion layer were more frequent during the same period than the present.
After 1965, the number of soot and haze decreased and the visibility tended to improve accordingly.
Also, unlike the soot and haze generated by the soaring dust and dirt, the inversion layer and fog caused by changes in temperature did not increase nor decrease throughout the 10 years.
The author discovered that the poor visibility and the occurrence of meteorological phenomena related to visibility are associated with each other.
It is used as an indicator of air pollution.
Tachikawa high school astronomy meteorological club have been observing visibility for about 70 years since the 1950s.
A senior of the club conducted a survey focused on visibility and analyzed data.
The results show the condition of visibility was very bad in Tachikawa in the past.
In this study, the cause of visibility was investigated by comparing the data of visual range data for about 10 years from 1957 when visibility was the worst with recorded meteorological phenomena (smoke, haze, fog, inversion layer, and wind dust).
For the survey, we used monthly reports written in the past and interviewed our alumni.
The data of visibility showed that visibility tended to be poor in winter especially in the morning and phenomena such as soot, haze and inversion layer were more frequent during the same period than the present.
After 1965, the number of soot and haze decreased and the visibility tended to improve accordingly.
Also, unlike the soot and haze generated by the soaring dust and dirt, the inversion layer and fog caused by changes in temperature did not increase nor decrease throughout the 10 years.
The author discovered that the poor visibility and the occurrence of meteorological phenomena related to visibility are associated with each other.