초록 ▼

목표1. 질소오염물질 유입에 의한 해양질소순환 정량ㆍ정성적 변동 규명 [Science 포함 SCI 논문 7편 발표]
(1) 대기/해양 관측데이터 기반 질소오염물질 해양유입의 시ㆍ공간적 변동
(2) 해양질소순환변동을 일으키는 주요 질소공급원(대기침적, 강유입, 질소고정생물)의 상대적 기여도
목표2. 질소오염물질 유입에 의한 해양일차생산력 정량ㆍ정성적 변동 규명 [SCI 논문 7편 발표]
(1) 질소오염물질 유입에 의한 해양일차생산력(식물플랑크톤) 변동
(2) 퇴적유기물 질소동위원소 측정으로 질소오염물질 기원

목표1. 질소오염물질 유입에 의한 해양질소순환 정량ㆍ정성적 변동 규명 [Science 포함 SCI 논문 7편 발표]
(1) 대기/해양 관측데이터 기반 질소오염물질 해양유입의 시ㆍ공간적 변동
(2) 해양질소순환변동을 일으키는 주요 질소공급원(대기침적, 강유입, 질소고정생물)의 상대적 기여도
목표2. 질소오염물질 유입에 의한 해양일차생산력 정량ㆍ정성적 변동 규명 [SCI 논문 7편 발표]
(1) 질소오염물질 유입에 의한 해양일차생산력(식물플랑크톤) 변동
(2) 퇴적유기물 질소동위원소 측정으로 질소오염물질 기원의 일차생산력 기여
목표3. 해양질소-탄소순환의 상호작용 규명 [SCI 논문 6편 발표]
(1) 해양질소고정 및 대기오염물질(질소, 탄소) 유입에 의한 해양 질소순환과 탄소순환의 상호영향 연구

(출처 : 보고서 요약서 3p)

Abstract ▼

□ Purpose
Goal 1. Reconstruct changes in marine nitrogen cycle induced due to nitrogen pollutant inputs.
Goal 2. Evaluate changes in marine primary production associated with nitrogen pollutant inputs.
Goal 3. Evaluate anthropogenic impacts on the interaction between ocean N and C cycles.

□ Purpose
Goal 1. Reconstruct changes in marine nitrogen cycle induced due to nitrogen pollutant inputs.
Goal 2. Evaluate changes in marine primary production associated with nitrogen pollutant inputs.
Goal 3. Evaluate anthropogenic impacts on the interaction between ocean N and C cycles.

□ contents
1.(1) Rates of increase in nitrogen abundance relative to phosphorous.
(2) Contribution of major nitrogen sources (atmospheric deposition, riverine input, nitrogen fixation) to oceanic nitrogen abundance.
2. (1) Variation of phytoplankton by the introduction of nitrogen pollutant.
(2) Contribution of nitrogen pollutant to marine primary production using measurements of nitrogen isotope composition of sedimentary organic matter.
3. Impacts of marine N fixation and inflow of air pollutants on ocean N and carbon cycles.

□ Developement results
Goal 1. Science and 6 SCI papers presented
(1-1) Spatial and temporal variations in nitrate concentration using analysis of nutrient data observed in the surrounding waters of the Korean peninsula over the past 40 years.
(1-2) Input of nitrates through the atmosphere by a novel method to estimate the rate of increase in nitrogen availability relative to phosphorous, using nutrient and transient tracer CFC-12 concentration data in the East Sea & North Pacific Ocean.
(2-1) Relative contributions of anthropogenic (atmospheric deposition, riverine input) and natural (nitrogen fixation) N sources using seasonal observations of marine organic N isotopes.
(2-2) Contribution of N fixation to seawater nitrate increase uisng measurements of N fixation rate over time.
Goal 2. Geophysical Research Letters and 6 SCI papers presented
(1) phytoplankton (chlorophyll) increase and species change of red tide bloom by inflow of nitrogen pollutants in the South / East China Sea.
(2) Contribution of nitrogen pollutant to marine primary production by N isotope analysis in marine sediment organic.
Goal 3. Global Biogeochemical Cycles and 5 SCI papers presented
C removal by marine N fixation and the effect of pollutants (N, C) on ocean N-C cycles.

□ Expected Contribution
1.(1) A novel method to estimate the rate of increase in nitrogen is applicable to other major basins including the Atlantic and Indian Oceans, and potentially enables establishment of a global inventory of anthropogenic nitrogen in the oceans. The results also improve the assessment of human impacts on the marine nitrogen cycle.
(2) The nitrogen isotope-based method to identify nitrogen sources is a powerful tool for identifying temporal dynamics of marine nitrogen fixation and major nitrogen inputs in waters surrounding Korea. It will improve our understanding of the marine nitrogen cycle in waters surrounding Korea. In particular, time-series data at ALOHA station would be included in the upcoming IPCC report.
2. The recent evolution of the relative abundance of nitrogen relative to phosphorous in the entire North Pacific Ocean(NPO), including the marginal seas. This result reveals how rapidly various parts of the NPO will shift from nitrogen-limited to phosphorous-limited conditions. This information enables assessment of the post-impacts of anthropogenic activities on the response of the marine ecosystem.
3. Results from Goal 3 can serve as a base for the development of an ocean model evaluating human-induced interactions of carbon and nitrogen cycles. As a result, future atmospheric CO₂ concentrations under various fossil-fuel CO₂ emission scenarios can be more accurately predicted.(A key theme for working group I of IPCC 5th report)

(출처 : SUMMARY 6p)