Korean Journal of Agricultural and Forest Meteorology (한국농림기상학회지)

Korean Society of Agricultural and Forest Meteorology (한국농림기상학회)
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Analysis of Upper- and Lower-level Wind and Trajectory in and from China During the P eriod of Occurrence of Migratory Insect Pests of South Korea

비래해충 발생기간 중국 발원지 바람 및 한반도 유입 궤적 분석

  • Received : 2023.07.06
  • Accepted : 2023.10.31
  • Published : 2023.12.30
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Abstract

In this study, the horizontal and vertical structure of wind speed and wind direction were analyzed at the origin of migratory insect pests in China. Wind rose analysis was carried out using the Land-Atmosphere Modeling Package (LAMP) - WRF data, which has the spatiotemporal resolution of about 20 km and 1 hour intervals. Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) was employed for backward trajectory analysis between South Korea and Southeastern China with Global Data Assimilation System (GDAS). The research interest date is July 16, when rice planthopper and leafhopper were observed at the same time. In order to examine where a jet stream occurs in the vertical in source regions and South Korea during the period (July 8 to July 17 in 2021), three-dimensional wind information was extracted and analyzed using the east-west, north-south, and vertical component wind data of the LAM P. The vertical distribution of wind showed that the wind changed in favor of the inflow of migratory insect pests during the period. As a result of analyzing the wind rose, about 30% or more of the wind at a point close to South Korea was classified into the low-level jet stream. In addition, majority of the wind directions for the low-level jet streams (rather than high-level jet streams) at the five origin sites were heading toward South Korea and even Japan, and this was supported by the HYSPLIT-based backward trajectory analysis.

본 연구는 수치모델 바람 자료를 통해서, 중국 비래해충 발원지의 기압별 분포와 바람장미도를 확인하여 풍향과 풍속을 분석하였다. 사용한 수치모델은 Land-Atmosphere Modeling Package (LAMP) - WRF 자료이며, 시공간 해상도는 1시간 간격의 약 20 km 수평해상도 자료이다. 2021년도에 벼멸구와 애멸구가 동시에 관찰된 예찰일인 7월 16일을 대상으로 하였다. 예찰일을 포함하는 7월 8일부터 7월 17일까지 발원지와 우리나라에 850 hPa부터 925 hPa에 이르는 하층대기에 제트 기류가 발생하는지를 살펴보기 위하여 LAMP 바람의 동서, 남북, 연직 성분 자료를 이용하여 풍속을 분석하였다. 바람의 연직 분포결과 비래해충 발생 시기가 될 때 바람이 비래해충 유입에 유리하게 바뀌는 것이 확인되었다. 바람장미도의 분석 결과, 우리나라와 가까운 지점에서 바람의 약 30% 이상이 제트 기류였고, 다섯 지점의 제트 기류의 풍향은 상층보다 하층에서 대부분 우리나라와 일본으로 향하고 있었으며, HYSPLIT의 역궤적 추적을 통해서도 하층 제트가 비래해충의 국내 유입에 영향을 준 것으로 분석이 되었다. 이 연구는 원하는 지점에서의 하층 제트의 풍속과 풍향을 비래해충 발생 시기와 비발생 시기를 비교 분석한 것으로, 국내로 유입되는 비래해충의 시기와 바람 통로에 대한 수평 및 연직적 연관 분석에 도움을 줄 것이다. 국내 144개 시군 농업기술센터에서 운영 중인 공중 포충망 설치 지역에 대한 검토와 평가에도 활용될 수 있을 것이다.

Keywords

Acknowledgement

본 연구는 농촌진흥청 연구사업 '자동 예찰 정보활용 주요 논 비래해충 발생 가능지 및 시기 분석 기술개발(PJ015620042022)'의 지원으로 수행되었습니다.

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