Temporal and spatial characteristics of fog occurrence over the Korean Peninsula

In this study, fogs are classified based on the spatial and temporal characteristics over South Korea using the visibility data and the empirical orthogonal function (EOF) and wavelet analyses. With fog defined in terms of visibility (

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Published in:Journal of Geophysical Research: Atmospheres 2010-07, Vol.115 (D14), p.n/a
Main Authors: Lee, Yong Hee, Lee, Jeong-Soon, Park, Seon Ki, Chang, Dong-Eon, Lee, Hee-Sang
Format: Article
Language:English
Subjects:
Atmospheric boundary layer
Atmospheric sciences
Coastal environments
Earth sciences
Earth, ocean, space
empirical orthogonal function
Exact sciences and technology
Fog
Geophysics
Mesoclimatology
Meteorology
Orthogonal functions
Spatial distribution
Temporal logic
Variance
Visibility
Wavelet analysis
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creator Lee, Yong Hee
Lee, Jeong-Soon
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Chang, Dong-Eon
Lee, Hee-Sang
description In this study, fogs are classified based on the spatial and temporal characteristics over South Korea using the visibility data and the empirical orthogonal function (EOF) and wavelet analyses. With fog defined in terms of visibility (
doi_str_mv 10.1029/2009JD012284
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With fog defined in terms of visibility (&lt;1 km), the EOF analysis is performed to extract spatial distribution characteristics via dimension reduction, whereas the space‐time wavelet expansion is applied to the EOF time series to specify the fog characteristics in the space of time versus scale (i.e., period in this study). The first EOF mode occupies 48.9% of total variance and shows the fog distribution covering almost entire areas of South Korea with one sign (+), except at the eastern coast and western part of the southern coast. The wavelet analysis reveals that this fog occurs based on meteorological conditions of various scales from daily to seasonal, thus classified as mixed fog. The second EOF mode, which occupies 19.5% of total variance, shows distinct separation of spatial distribution of fog, with a negative (−) sign in winter over northwestern coastal/inland, western coastal, and south central mountain areas of South Korea and a positive (+) sign in other seasons elsewhere. With cycles of 1–2 weeks and 1–2 months being dominant in the wavelet analysis, this fog is considered to be strongly affected by synoptic scale weather systems and monsoon. Fog over the positive area is mostly affected by monsoon and/or cyclonic frontal systems, thus classified as frontal fog, whereas that over the negative area is affected by the cold‐core anticyclones moving over warm sea surface in winter or by radiative cooling, thus classified as steam fog (coastal/sea) or radiation fog (inland), respectively. The mountain area may have upslope fog because of orographic lifting. 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Geophys. Res</addtitle><description>In this study, fogs are classified based on the spatial and temporal characteristics over South Korea using the visibility data and the empirical orthogonal function (EOF) and wavelet analyses. With fog defined in terms of visibility (&lt;1 km), the EOF analysis is performed to extract spatial distribution characteristics via dimension reduction, whereas the space‐time wavelet expansion is applied to the EOF time series to specify the fog characteristics in the space of time versus scale (i.e., period in this study). The first EOF mode occupies 48.9% of total variance and shows the fog distribution covering almost entire areas of South Korea with one sign (+), except at the eastern coast and western part of the southern coast. The wavelet analysis reveals that this fog occurs based on meteorological conditions of various scales from daily to seasonal, thus classified as mixed fog. 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With fog defined in terms of visibility (&lt;1 km), the EOF analysis is performed to extract spatial distribution characteristics via dimension reduction, whereas the space‐time wavelet expansion is applied to the EOF time series to specify the fog characteristics in the space of time versus scale (i.e., period in this study). The first EOF mode occupies 48.9% of total variance and shows the fog distribution covering almost entire areas of South Korea with one sign (+), except at the eastern coast and western part of the southern coast. The wavelet analysis reveals that this fog occurs based on meteorological conditions of various scales from daily to seasonal, thus classified as mixed fog. 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source Wiley-Blackwell Journals; Wiley-Blackwell AGU Digital Archive
subjects Atmospheric boundary layer
Atmospheric sciences
Coastal environments
Earth sciences
Earth, ocean, space
empirical orthogonal function
Exact sciences and technology
Fog
Geophysics
Mesoclimatology
Meteorology
Orthogonal functions
Spatial distribution
Temporal logic
Variance
Visibility
Wavelet analysis
title Temporal and spatial characteristics of fog occurrence over the Korean Peninsula
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