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NTIS 바로가기한국지구과학회지 = Journal of the Korean Earth Science Society, v.33 no.6, 2012년, pp.554 - 566
장유순 (미국 해양 대기청 지구유체역학 연구소, 프린스턴 대학교 포레스털 캠퍼스)
High-density temperature and salinity profiles from the successful international Argo project made it possible to reproduce the three-dimensional global ocean state in near-real time, which also increased much attention on the data analysis studies of global ocean. This paper reviewed several import...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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총 해수면 상승은 어떻게 계산될 수 있는가? | 총 해수면 상승(total sea level)은 해양의 열염 변동 성분(steric component)과 담수 및 해빙의 유입 등에 의한 질량 변동 성분(mass component)의 합으로 계산될 수 있다. 이러한 해수면 수지는 서로 다른 관측 시스템을 통해 독립적으로 얻어질 수 있다. | |
해양물리 연구 분야에서 수치 모델링을 하는 이유 세 가지는 무엇인가? | 해양물리 연구 분야에서 수치 모델링을 하는 이유를 다음과 같이 크게 세 가지로 정리할 수 있다. 첫째는 현상의 물리적 원인 규명을 위한 조건 실험을 위함이며, 둘째는 부족한 관측 자료를 역학적으로 보간하여 과거부터 현재까지의 해양 상태를 정확하게 재현하기 위함이며, 셋째는 현상의 예측을 위함이다. 그러나 수치 모델을 구성하는 기본 방정식들이 현상을 완벽하게 표현하지 못하고 해양 현상의 비선형성과 관계된 초기장에 대한 민감한 의존성을 가지기 때문에 해양 상태의 정확한 재현 및 예측에는 근본적인 한계를 가지고 있다. | |
재분석 자료의 한계는 무엇인가? | 이를 보완하기 위해 다양한 관측 자료를 수치 모델과 결합하는 자료동화(data assimilation) 기법이 꾸준히 연구되어 왔으며, 이를 통해 얻어진 재분석 자료(reanalysis data)가 전지구 해양 상태의 “관측값”으로 대표되어 해황 분석 및 예측 모델의 초기 자료로 사용되어 왔다. 그러나 재분석 자료에도 수치 모델 자체 및 동화 기법의 한계뿐만 아니라, 부정확한 모델 초기값 및 경계값 사용, 관측 자료 자체의 오차 및 비연속성 등 수 많은 오차 요인이 존재한다. 이러한 이유로 특히 해양의 3차원 수온, 염분 재분석 자료들에 관한 평가가 지속적으로 이루어지고 있다(Carton and Santorelli, 2008; Lee et al. |
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