기상청 지구시스템모델에서의 구름입자 수농도 모수화 방법 개선
Improvement of Cloud Physics Parameterization in the KMA Earth System Model
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초록
In the Korea Meteorological Administration earth system model (HadGEM2-AO),cloud drop number concentration is determined from aerosol number concentration accordingto the observed relationship between aerosol and cloud drop number concentrations. However,the observational dataset used for establishing the relationship was obtained from limitedregions of the earth and therefore may not be representative of the entire earth. Here we reestablishedthe relationship between aerosol and cloud drop number concentrations based on acomposite of observational dataset obtained from many different regions around the world thatincludes the original dataset. The new relationship tends to provide lower cloud drop numberconcentration for aerosol number concentration < 600 cm−3 and the opposite for > 600 cm−3. This new empirical relationship was applied to the KMA earth system model and the historicalrun (1861~2005) is made again. Here only the 30 year (1861~1890) averages from the runswith the new and the original relationships between aerosol and cloud drop number concentrations(newHIST and HIST, respectively) were compared. For this early period aerosol numberconcentrations were generally lower than 600 cm−3 and therefore cloud drop number concentrationswere generally lower but cloud drop effective radii were larger for newHIST than forHIST. The results from the complete historical run with the new relationship are expected toshow more significant differences from the original historical run.
Abstract
In the Korea Meteorological Administration earth system model (HadGEM2-AO),cloud drop number concentration is determined from aerosol number concentration accordingto the observed relationship between aerosol and cloud drop number concentrations. However,the observational dataset used for establishing the relationship was obtained from limitedregions of the earth and therefore may not be representative of the entire earth. Here we reestablishedthe relationship between aerosol and cloud drop number concentrations based on acomposite of observational dataset obtained from many different regions around the world thatincludes the original dataset. The new relationship tends to provide lower cloud drop numberconcentration for aerosol number concentration < 600 cm−3 and the opposite for > 600 cm−3. This new empirical relationship was applied to the KMA earth system model and the historicalrun (1861~2005) is made again. Here only the 30 year (1861~1890) averages from the runswith the new and the original relationships between aerosol and cloud drop number concentrations(newHIST and HIST, respectively) were compared. For this early period aerosol numberconcentrations were generally lower than 600 cm−3 and therefore cloud drop number concentrationswere generally lower but cloud drop effective radii were larger for newHIST than forHIST. The results from the complete historical run with the new relationship are expected toshow more significant differences from the original historical run.
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