한국농림기상학회지, 제 13권 제2호(2011) (pISSN 1229-5671, eISSN 2288-1859)
Korean Journal of Agricultural and Forest Meteorology, Vol. 13, No. 2, (2011), pp. 48~55
DOI: 10.5532/KJAFM.2010.13.2.048
ⓒ Author(s) 2014. CC Attribution 3.0 License.


해수면에 의해 반사된 태양복사 성분의 특성: 남한의 제주도 사례

Uno Fumichika(1), Yousay Hayashi(1), 황수진(2), 김해동(3)
(1)일본 쓰쿠바대학교 생명환경과학대학원, (2)부산대학교 지구과학교육과, (3)계명대학교 지구환경학과

(2011년 05월 24일 접수; 2011년 06월 15일 수정; 2011년 06월 24일 수락)

Properties of Solar Radiation Components Reflected by the Sea Surface:
- A Case of Jeju Island, South Korea –

Uno Fumichika(1), Yousay Hayashi(1), Soo-Jin Hwang(2), Hae-Dong Kim(3)
(1)Graduate School of Life and Environmental Science, University of Tsukuba, Tsukuba 305-0001, Japan
(2)Department of Earth Science Education, Pusan National University, Pusan 609-735, Korea
(3)Department of Global Environment, Keimyung University, Daegu 704-701, Korea

(Received May 24, 2011; Revised June 15, 2011; Accepted June 24, 2011)

ABSTRACT
Solar radiation components reflected by the sea surface (Rss↑) are additional energy sources comprising the solar radiation regime. Previous studies, based on observational approaches, indicated that Rss↑ is an available climatological resource. However, an estimation process for Rss↑ has not been established. In this case study over Jeju Island in South Korea, we applied a new estimation process to solar radiation modeling and discussed the spatial distribution of Rss↑ and its seasonal variation. Our results showed that the illuminated area and the intensity of Rss↑ became greatest at the winter solstice and least at the summer solstice. We estimated the illuminated area of Rss↑ as it expanded over the southern slope of Jeju Island. At the winter solstice, on a daily basis, the area and intensity of illumination by Rss↑ were 182.3km2 and 0.41 MJ m-2day-1, respectively. Comparing the daily accumulative and instantaneous values of Rss↑ intensity, the difference was about 20 times greater in daily cases than in instantaneous cases. On the other hand, for instantaneous values, the Rss↑ intensity accounted for up to 33% of the three components, i.e., direct, diffuse and reflected radiation in winter solstice. In addition, it was estimated that the sea surface reflectance depended on the wind speed. Therefore, in a practical use of this revised model, wind conditions should be considered as a critical factor in estimating Rss↑.

Keyword: Solar radiation, Reflection by the sea, Topographic shading, Jeju Island

MAIN

적요

해안지대의 에너지평형을 결정짓는 복사성분 가운데 주변 바다로부터 반사되는 양을 무시할 수 없지만 아직 해수면 반사성분을 추정할 수 있는 방법이 확립되지 못한 실정이다. 본 연구에서는 새로운 추정방법을 고안하여 해수면 반사성분의 지리적, 계절적 분포양상을 모의하였으며, 그 결과 영향권의 면적과 수광량 모두 동지 무렵에 가장 크고 하지 무렵에 가장 적다는 것을 밝혔다. 이 방법을 제주도 한라산 사면에 적용할 경우 동지 무렵의 해수면 반사영향권은 182.3km2이고 하루 누적 수광량은 0.41MJ m-2 이었다. 순간값의 경우 일 중 시간에 따라 전체 일사수광량 가운데 해수면 반사성분이 최대 33%를 차지하였다. 이 모형에 의해 해수면 반사성분을 추정할 때 가장 큰 영향을 주는 기상요인은 풍속으로 나타났다. 따라서, 현실적인 산출을 위해서는 모형에서 풍속을 고려해 주어야만 한다.

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