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http://dx.doi.org/10.14191/Atmos.2018.28.4.427

Sensitivity Analysis of Near Surface Air Temperature to Land Cover Change and Urban Parameterization Scheme Using Unified Model  

Hong, Seon-Ok (Applied Meteorology Research Division, National Institute of Meteorological Sciences)
Byon, Jae-Young (Applied Meteorology Research Division, National Institute of Meteorological Sciences)
Park, HyangSuk (Applied Meteorology Research Division, National Institute of Meteorological Sciences)
Lee, Young-Gon (Applied Meteorology Research Division, National Institute of Meteorological Sciences)
Kim, Baek-Jo (Observation and Forecast Research Division, National Institute of Meteorological Sciences)
Ha, Jong-Chul (Applied Meteorology Research Division, National Institute of Meteorological Sciences)
Publication Information
Atmosphere / v.28, no.4, 2018 , pp. 427-441 More about this Journal
Abstract
This study examines the impact of the urban parameterization scheme and the land cover change on simulated near surface temperature using Unified Model (UM) over the Seoul metropolitan area. We perform four simulations by varying the land cover and the urban parameterization scheme, and then compare the model results with 46 AWS observation data from 2 to 9 August 2016. Four simulations were performed with different combination of two urban parameterization schemes and two land cover data. Two schemes are Best scheme and MORUSES (Met Office Reading Urban Surface Exchange Scheme) and two land cover data are IGBP (International Geosphere and Biosphere Programme) and EGIS (Environmental Geographic information service) land cover data. When land use data change from IGBP to EGIS, urban ratio over the study area increased by 15.9%. The results of the study showed that the higher change in urban fraction between IGBP and EGIS, the higher the improvement in temperature performance, and the higher the urban fraction, the higher the effect of improving temperature performance of the urban parameterization scheme. 1.5-m temperature increased rapidly during the early morning due to increase of sensible heat flux in EXP2 compared to CTL. The MORUSES with EGIS (EXP3) provided best agreement with observations and represents a reasonable option for simulating the near surface temperature of urban area.
Keywords
Unified Model; urban parameterization; land-cover change; surface energy balance;
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