Local Meteorological and Synoptic Characteristics of Fogs Formed over Incheon International Airport in the West Coast of Korea |
| |
Authors: | Chang Ki KIM and Seong Soo YUM |
| |
Institution: | Department of Atmospheric Sciences, Yonsei University 134 Shinchon-dong, Seodaemun-gu, Seoul 120--749, Korea,Department of Atmospheric Sciences, Yonsei University 134 Shinchon-dong, Seodaemun-gu, Seoul 120--749, Korea |
| |
Abstract: | Fogs observed over Incheon international airport (IIA) in the west
coast of Korea from January 2002 to August 2006 are classified into categories
of coastal fog, cold sea fog, and warm sea fog based on the areal extent of the
fogs and the difference between the air temperature (T) and the SST, i.e.,
cold sea fog if TSST = T-SST>0oC and warm sea fog if TSST
<0oC. The numbers of coastal, cold, and warm sea fog cases
are 64, 26, and 9. Coastal fogs form most frequently in winter, while cold sea
fogs occur mostly in summer and warm sea fogs are observed from January to May
but not in November and December. On average the air gets colder by
1.6oC during the three hours leading up to the coastal fog
formation, and an additional cooling of 1.1oC occurs during the
fog. The change in the dew point temperature (Td) is minimal except
during the fog (0.6oC). Decreases in T for the cold and warm
sea fogs are relatively smaller. The average Td is higher than SST
during the cold sea fog periods but this Td is more than
4oC higher than that for the corresponding non-fog days,
suggesting that cold sea fogs be formed by the cooling of already humid air
(i.e., Td>SST). Increases of Td are significant during the
warm sea fog periods (1.4oC), implying that efficient moisture
supply is essential to warm sea fog formation. Four major synoptic patterns are
identified in association with the observed fogs. The most frequent is a north
Pacific high that accounts for 38% of cases. Surface or upper inversions are
present in 77%, 69%, and 81% of the fog periods for coastal, cold, and
warm sea fogs, respectively. |
| |
Keywords: | costal fogs sea fogs west coast of Korea meteorological and synoptic characteristics |
本文献已被 维普 万方数据 SpringerLink 等数据库收录! |
| 点击此处可从《大气科学进展》浏览原始摘要信息 |
| 点击此处可从《大气科学进展》下载免费的PDF全文 |
|