서울·대구 ASOS 지점에서 건물에 의한 일조 차단 영향
Blocking Effects of Buildings on Sunshine Duration at Seoul and Daegu ASOSs
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참고문헌
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초록
In this study, the observational environment for sunshine duration at Seoul andDaegu Automated Synoptic Observing Systems (ASOSs) was analyzed using a numericalmodel. In order to analyze the effects of topography and buildings on observational environmentfor sunshine duration, the model domains including the elevated building and mountainousareas around Seoul and Daegu ASOSs were considered. Three dimensional topography andbuildings used as input data for the numerical model were constructed using a geographic informationsystem (GIS) data. Solar azimuth and altitude angles calculated for the analysis period(one-week for each season in 2008) in this study were validated against those by Korea Astronomyand Space Science Institute (KASI). The starting and ending times of sunshine durationobserved at ASOSs largely differed from the respective sunrise and sunset times simply calculatedusing solar angles and information of ASOSs’ latitude and longitude, because uneventopography and elevated buildings around ASOSs cut off sunshine duration right after the sunriseand right before the sunset. The model produced the sunshine indices for Seoul and DaeguASOSs with the time interval of one minute and the period of one week for each season and wecompared the hourly averaged indices with those observed at the ASOSs. One week of whichthe cloudiness is lowest for each season is selected for analysis. Not only the adjacent buildingsbut also distant buildings and mountain cut off sunshine duration right after the sunrise and rightbefore the sunset. The buildings and topography cutting off sunshine duration were found foreach analyzing date. It was suggested that, in order to evaluate the observational environmentfor sunshine duration, we need to consider even the information of topography and/or buildingfar away from ASOSs. This study also showed that the analyzing method considering the GISdata is very useful for evaluation of observational environment for sunshine duration.
Abstract
In this study, the observational environment for sunshine duration at Seoul andDaegu Automated Synoptic Observing Systems (ASOSs) was analyzed using a numericalmodel. In order to analyze the effects of topography and buildings on observational environmentfor sunshine duration, the model domains including the elevated building and mountainousareas around Seoul and Daegu ASOSs were considered. Three dimensional topography andbuildings used as input data for the numerical model were constructed using a geographic informationsystem (GIS) data. Solar azimuth and altitude angles calculated for the analysis period(one-week for each season in 2008) in this study were validated against those by Korea Astronomyand Space Science Institute (KASI). The starting and ending times of sunshine durationobserved at ASOSs largely differed from the respective sunrise and sunset times simply calculatedusing solar angles and information of ASOSs’ latitude and longitude, because uneventopography and elevated buildings around ASOSs cut off sunshine duration right after the sunriseand right before the sunset. The model produced the sunshine indices for Seoul and DaeguASOSs with the time interval of one minute and the period of one week for each season and wecompared the hourly averaged indices with those observed at the ASOSs. One week of whichthe cloudiness is lowest for each season is selected for analysis. Not only the adjacent buildingsbut also distant buildings and mountain cut off sunshine duration right after the sunrise and rightbefore the sunset. The buildings and topography cutting off sunshine duration were found foreach analyzing date. It was suggested that, in order to evaluate the observational environmentfor sunshine duration, we need to consider even the information of topography and/or buildingfar away from ASOSs. This study also showed that the analyzing method considering the GISdata is very useful for evaluation of observational environment for sunshine duration.
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