[논문]Changed Relationship between Snowfall over the Yeongdong region of the Korean Peninsula and Large-scale Factors

Cho, Keon-Hee; Chang, Eun-Chul

doi:10.5467/jkess.2017.38.3.182

[국내논문] Changed Relationship between Snowfall over the Yeongdong region of the Korean Peninsula and Large-scale Factors 원문보기

한국지구과학회지 = Journal of the Korean Earth Science Society, v.38 no.3, 2017년, pp.182 - 193

Cho, Keon-Hee (Department of Atmospheric Science, Kongju National University) , Chang, Eun-Chul (Department of Atmospheric Science, Kongju National University)

Abstract ▼ AI-Helper

A typical snowfall pattern occurs over the east coastal region of the Korean Peninsula, known as the Yeongdong region. The precipitation over the Yeongdong region is influenced by the cold and dry northeasterly wind which advects over warm and moist sea surface of the East Sea of Korea. This study reveals the influence of large-scale factors, affecting local to remote areas, on the mesoscale snowfall system over the Yeongdong region. The National Centers for Environmental Prediction-Department of Energy reanalysis dataset, Extended Reconstructed sea surface temperature, and observed snowfall data are analyzed to reveal the relationship between February snowfall and large-scale factors from 1981 to 2014. The Yeongdong snowfall is associated with the sea level pressure patterns over the Gaema Plateau and North Pacific near the Bering Sea, which is remotely associated to the sea surface temperature (SST) variability over the North Pacific. It is presented that the relationship between the Yeongdong snowfall and large-scale factors is strengthened after 1999 when the central north Pacific has warm anomalous SST. These enhanced relationships explain the atmospheric patterns of recent strong snowfall years (2010, 2011, and 2014). It is suggested that the newly defined index in this study based on related SST variability can be used for a seasonal predictor of the Yeongdong snowfall with 2-month leading.

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문제 정의

We suggest the NPS index for the seasonal forecast of February YD snowfall. The index comprises the sum of the variability of the normalized SST over the Bering Sea, ENP, and CNP. The YD precipitation can be predicted by the 2-month leading NPS index, which can be utilized as a predictor for the seasonal forecast.

가설 설정

When the snowfall forms over the East sea with northeasterly, it initiates from coastal region and penetrates western part of the Taebaek Mountains (Yeongseo region) in strong snowfall years. Thus, in this study, we defined the YD region including part of Yeongseo region as well as the eastern part of the Mountains (i.e., original YD region) to represent the snowfall pattern.

제안 방법

In this study, we investigated relationship between large-scale factors and the YD snowfall for recent 34 years. Also, changes of the relationship are examined by analyzing changes of the large-scale factors related to the YD snowfall mechanism.

대상 데이터

This ERSST data has a resolution of 2º (latitude)×2º (longitude). The observed precipitation is obtained from 8 stations through the National Climate Data Service System (NCDSS) of the Korea Meteorological Administration (KMA). All datasets cover 34 years (1981-2014), the period selected to investigate the snowfall changes in this study.
The snowfall observation data are obtained from 8 stations (Chuncheon, Daegwallyeong, Donghae, Gangneung, Inje, Sokcho, Wonju, and Yeongwol) over the YD region from the NCDSS in the KMA. No significant trends are observed; however, there are some distinct strong snowfall years (1987, 1996, 2010, 2011, and 2014).
Two gridded data sets are used in this study. The SLP and wind data are obtained from the National Centers for Environmental Prediction (NCEP)-Department of Energy (DOE) Reanalysis (Kanamitsu et al.

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상세보기
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원문보기 상세보기
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원문보기 상세보기
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상세보기
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상세보기
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상세보기
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원문보기 상세보기
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원문보기 상세보기
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원문보기 상세보기
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[국내논문] Changed Relationship between Snowfall over the Yeongdong region of the Korean Peninsula and Large-scale Factors 원문보기

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[국내논문] Changed Relationship between Snowfall over the Yeongdong region of the Korean Peninsula and Large-scale Factors 원문보기

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