On July 2^(nd),2025,32 scientists representing 15 countries gathered at Tartu,Estonia to make on-site endorsements for the Global ONCE(Ocean Negative Carbon Emissions)Program at the 12th INTECOL Wetlands Conference.Th...On July 2^(nd),2025,32 scientists representing 15 countries gathered at Tartu,Estonia to make on-site endorsements for the Global ONCE(Ocean Negative Carbon Emissions)Program at the 12th INTECOL Wetlands Conference.This marks a significant milestone for ONCE in establishing a systematic framework for coastal wetland carbon sequestration research and global collaboration(Figs.1,2).Coastal wetlands are critical transition zones linking terrestrial and marine ecosystems,yet they face severe degradation from anthropogenic land-based activities and sea level rise that propagate impacts to the ocean.As a UN Ocean Decade Program,the Global ONCE Program champions interdisciplinary and cross-regional collaboration to enhance carbon sequestration in the ocean and coastal wetlands through science and innovation.Aligned with the Tartu Declaration on Wetlands that includes resolutions to promote the rights of global wetlands(especially peatlands)and advance the discipline of wetland science based on facts,this initiative addresses key knowledge gaps in land-ocean interactions.The goal is to harness the full potential of coastal wetlands and ocean systems for climate mitigation,thereby laying a scientific foundation for international policy formulation and implementation.展开更多
为了研究2021年调水调沙期间黄河口水沙分布及生态环境变化,探讨调水调沙对黄河口地区水动力和生态环境的影响机制。本文基于非结构网格有限体积海洋模型(Finite volume community ocean model,FVCOM)建立渤海三维水动力模型和生态模型...为了研究2021年调水调沙期间黄河口水沙分布及生态环境变化,探讨调水调沙对黄河口地区水动力和生态环境的影响机制。本文基于非结构网格有限体积海洋模型(Finite volume community ocean model,FVCOM)建立渤海三维水动力模型和生态模型,并结合遥感资料,分析调水调沙期间黄河口冲淡水、悬浮泥沙、营养盐及叶绿素a质量浓度的时空变化特征。结果表明,调水调沙显著改变了黄河口冲淡水和悬浮泥沙的分布与扩散特征。调水调沙期间,黄河口海域悬浮泥沙和营养盐浓度明显增加,悬浮泥沙扩散范围在排沙期和排水期基本一致,但因入海径流量减少,排沙期扩散范围有所限制。陆源物质主要集中在河口南北两侧,南侧扩散范围大于北侧。同时,调水调沙期间氮磷比增大,营养盐输入促进浮游植物生长,导致叶绿素a质量浓度显著升高。然而,悬浮泥沙浓度上升引发光限制效应,部分抵消了营养盐增加对初级生产的促进作用。研究表明,将排沙期设置在调水期之后,对降低光限制效应和抑制有害藻华具有重要作用。本研究为优化黄河口调水调沙方案、有效防控藻华及维护生态环境提供了科学依据。展开更多
文摘On July 2^(nd),2025,32 scientists representing 15 countries gathered at Tartu,Estonia to make on-site endorsements for the Global ONCE(Ocean Negative Carbon Emissions)Program at the 12th INTECOL Wetlands Conference.This marks a significant milestone for ONCE in establishing a systematic framework for coastal wetland carbon sequestration research and global collaboration(Figs.1,2).Coastal wetlands are critical transition zones linking terrestrial and marine ecosystems,yet they face severe degradation from anthropogenic land-based activities and sea level rise that propagate impacts to the ocean.As a UN Ocean Decade Program,the Global ONCE Program champions interdisciplinary and cross-regional collaboration to enhance carbon sequestration in the ocean and coastal wetlands through science and innovation.Aligned with the Tartu Declaration on Wetlands that includes resolutions to promote the rights of global wetlands(especially peatlands)and advance the discipline of wetland science based on facts,this initiative addresses key knowledge gaps in land-ocean interactions.The goal is to harness the full potential of coastal wetlands and ocean systems for climate mitigation,thereby laying a scientific foundation for international policy formulation and implementation.
文摘为了研究2021年调水调沙期间黄河口水沙分布及生态环境变化,探讨调水调沙对黄河口地区水动力和生态环境的影响机制。本文基于非结构网格有限体积海洋模型(Finite volume community ocean model,FVCOM)建立渤海三维水动力模型和生态模型,并结合遥感资料,分析调水调沙期间黄河口冲淡水、悬浮泥沙、营养盐及叶绿素a质量浓度的时空变化特征。结果表明,调水调沙显著改变了黄河口冲淡水和悬浮泥沙的分布与扩散特征。调水调沙期间,黄河口海域悬浮泥沙和营养盐浓度明显增加,悬浮泥沙扩散范围在排沙期和排水期基本一致,但因入海径流量减少,排沙期扩散范围有所限制。陆源物质主要集中在河口南北两侧,南侧扩散范围大于北侧。同时,调水调沙期间氮磷比增大,营养盐输入促进浮游植物生长,导致叶绿素a质量浓度显著升高。然而,悬浮泥沙浓度上升引发光限制效应,部分抵消了营养盐增加对初级生产的促进作用。研究表明,将排沙期设置在调水期之后,对降低光限制效应和抑制有害藻华具有重要作用。本研究为优化黄河口调水调沙方案、有效防控藻华及维护生态环境提供了科学依据。
