A Geospatial Evaluation of Potential Sea Effects on Observed Air Temperature
2010
Kim, S.O., Kyung Hee University, Yongin, Republic of Korea | Yun, J.I., Kyung Hee University, Yongin, Republic of Korea | Chung, U.R., National Center for Agro-Meteorology, Seoul National University, Seoul, Republic of Korea | Hwang, K.H., STA Inc., Seoul, Republic of Korea
This study was carried out to quantify potential effects of the surrounding ocean on the observed air temperature at coastal weather stations in the Korean Peninsula. Daily maximum and minimum temperature data for 2001-2009 were collected from 66 Korea Meteorological Administration (KMA) stations and the monthly averages were calculated for further analyses. Monthly data from 27 inland sites were used to generate a gridded temperature surface for the whole Peninsula based on an inverse distance weighting and the local temperature at the remaining 39 sites were estimated by recent techniques in geospatial climatology which are widely used in correction of small - scale climate controls like cold air drainage, urban heat island, topography as well as elevation. Deviations from the observed temperature were regarded as the 'apparent' sea effect and showed a quasi-logarithmic relationship with the distance of each site from the nearest coastline. Potential effects of the sea on daily temperature might exceed 6.0℃ cooling in summer and 6.5℃ warming in winter according to this relationship. We classified 25 sites within the 10 km distance from the nearest coastline into 'coastal sites' and the remaining 15 'fringe sites'. When the average deviations of the fringe sites (0.5℃ for daily maximum and 1.0℃ for daily minimum temperature) were used as the 'noise' and subtracted from the 'apparent' sea effects of the coastal sites, maximum cooling effects of the sea were identified as 1.5℃ on the west coast and 3.0℃ on the east and the south coast in summer months. The warming effects of the sea in winter ranged from 1.0℃ on the west and 3.5℃ on the south and east coasts.
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