Land Ocean Carbon Transfer (1-year extension)

陆地海洋碳转移（LOCATE）方案在国家石油公司、CEH、PML和BGS之间建立了真正新的和高效的合作，以提供对陆源溶解有机质（tDOM）通量的新认识，这些通量跨越溪流、河流、河口并进入沿海海洋和全球海洋。这些通量共同代表了全球C循环中一个重要的、不断变化的、但人们知之甚少的组成部分。我们已经取得了以下主要进展：1)首次将tDOM通量与GB河流的潮汐范围进行内部一致的整合，表明高原针叶林增强了这种通量；2)对温带河口水域的tDOM运输进行了最大规模的研究，强调了这种物质的组成和命运受到陆地人类活动的强烈影响；3)对整个北海的tDOM分布进行了最全面的评估，确定从西北欧和斯堪的纳维亚大陆出口的大部分tDOM必须在内部埋藏或再矿化，并有可能向大气损失；4)开发了一个全新的模型，UniDOM，它统一了陆地-海洋水生连续体（LOAC）中tDOM周转的概念、状态变量和参数化。我们在了解tDOM的通量和命运方面取得的进展使人们对水生生态系统中温室气体（ghg; CO2, CH4, N2O）通量和控制这些通量的过程知之甚少。我们的主要利益相关者，包括BEIS和主要的水务公司，认识到这种缺乏理解阻碍了国家温室气体排放报告和可持续土地和水管理政策的发展，从而使英国政府能够在2050年实现温室气体净零排放。在我们以往成果的基础上，我们提出的推广活动旨在：1)为GB LOAC制定温室气体预算；2)了解控制这些温室气体的生物和非生物过程；3)评估人类活动的影响。我们将通过一系列相互关联的目标来实现这些目标，这些目标结合了基于桌面的合成和建模活动，分析了我们最初长达一年的gb规模现场项目的存档样本，利用我们的传统焦点集水区建立一套基线观察结果，以及利益相关者的参与。我们将继续与区域、国家和国际各利益攸关方合作，确定这种新认识在何处以及如何为碳封存和气候调节相关的政策和实践带来有益的结果。

The Land Ocean Carbon Transfer (LOCATE) programme has established genuinely new and highly effective collaborations across NOC, CEH, PML and BGS to deliver new understanding of terrigenous dissolved organic matter (tDOM) fluxes across streams, rivers, estuaries and into coastal seas and the global ocean. These fluxes collectively represent a significant and changing, yet poorly understood, component of the global C cycle. Together, we have already achieved the following, major advances: 1) the first internally consistent integration of tDOM fluxes to the tidal extent of GB rivers, demonstrating that coniferous forestry in uplands enhances this flux; 2) the largest study of tDOM transport across temperate estuarine waters, highlighting that the composition and fate of this material is strongly influenced by human activities on land; 3) the most comprehensive assessment of the distribution of tDOM throughout the North Sea, identifying that the bulk of tDOM exported from the Northwest European and Scandinavian landmasses must be buried or remineralized internally, with potential losses to the atmosphere; 4) the development of a fundamentally new model, UniDOM, that unifies concepts, state variables and parameterisations of tDOM turnover across the land-ocean aquatic continuum (LOAC). Our developments in understanding the fluxes and fate of tDOM have brought into sharp focus how little is known about greenhouse gas (GHGs; CO2, CH4, N2O) fluxes and the processes that control these in aquatic ecosystems. Our key stakeholders, including BEIS and major water companies, recognise that this lack of understanding hinders national GHG emissions reporting and the development of sustainable land- and water management policies to enable the UK government to achieve net-zero GHG emissions by 2050. Building upon our previous achievements, our proposed extension activities aim to:1) develop a GHG budget for the GB LOAC, 2) understand the biotic and abiotic processes that control these, and 3) assess the influence of human activities. We will achieve these through a series of interconnected objectives that combine desk-based syntheses and modelling activities, analysis of archived samples from our original year-long GB-scale field programme, use of our legacy focal catchments to establish a suite of baseline observations, and stakeholder engagement. We will continue to work with our diverse range of regional, national and international stakeholders to identify where and how this new understanding can achieve beneficial outcomes for policies and practices relating to C sequestration and climate regulation.