도시화에 의한 야간 대기 냉각율 변화에 관한 연구 (Study on the Variation of Nighttime Cooling RateAssociated with Urbanization)

서지정보

· 발행기관 : 한국대기환경학회
· 수록지 정보 : 한국대기환경학회지 / 24권 / 1호 / 83 ~ 90페이지
· 저자명 : 이순환, 박명희, 김해동

초록

In order to clarify the urbanization intensity of Daegu Metropolitan and its characteristics, comparative study onthe variation of the cooling rate of two different sites was carried out using observation data for 40 years by KoreaMeteorological Adminstration. Daegu Metropolitan and Chupungnyung represent well urbanized and rural areas,respectively. In comparison with Chupungnyung, yearly mean temperature at Daegu Metropolitan increases rapidly andespecially the differences of minimum temperature increasing rate during 40 years becomes greater. Thesedifferences of regional warming are caused by the different urbanization intensity between two sites. And theimpact of anthropogenic heat due to urbanization should be stronger in nighttime than in daytime.Sensible heat advection by regional wind during 6 hours from 18 LST contributes to atmospheric cooling. Forthis reason wind speed is in proportion to cooling rate of atmosphere. However, wind after 24 LST induces thewarm air advection and makes decrease the cooling rate in urban area. Although the cooling rates between DaeguMetropolitan and Chupungnyung are some different, the variation tendencies of cooling rate of two site are almostsame. Therefore atmospheric cooling rate in nighttime tends to be associated with the intensity of wind speed.

영어초록

In order to clarify the urbanization intensity of Daegu Metropolitan and its characteristics, comparative study onthe variation of the cooling rate of two different sites was carried out using observation data for 40 years by KoreaMeteorological Adminstration. Daegu Metropolitan and Chupungnyung represent well urbanized and rural areas,respectively. In comparison with Chupungnyung, yearly mean temperature at Daegu Metropolitan increases rapidly andespecially the differences of minimum temperature increasing rate during 40 years becomes greater. Thesedifferences of regional warming are caused by the different urbanization intensity between two sites. And theimpact of anthropogenic heat due to urbanization should be stronger in nighttime than in daytime.Sensible heat advection by regional wind during 6 hours from 18 LST contributes to atmospheric cooling. Forthis reason wind speed is in proportion to cooling rate of atmosphere. However, wind after 24 LST induces thewarm air advection and makes decrease the cooling rate in urban area. Although the cooling rates between DaeguMetropolitan and Chupungnyung are some different, the variation tendencies of cooling rate of two site are almostsame. Therefore atmospheric cooling rate in nighttime tends to be associated with the intensity of wind speed.

참고자료

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