NSFGEO-NERC: WOOD-BASED CARBON DISCHARGE TO THE ARCTIC OCEAN

NSFGEO-NERC：向北冰洋排放木材碳

• 批准号: NE/R017530/1
• 负责人: Robert Hilton
• 金额: $ 6.94万
• 依托单位: Durham University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FR017530%2F1
• 关键词: NSFGEO; NERC; WOOD; BASED; CARBON

Erosion processes mobilize and deliver organic carbon (OC) from soils and plants and can supply it to rivers. The resultant discharge of carbon by rivers to the world's oceans is globally significant, with current estimates of 160 Mega tonnes of carbon per year in particulate OC (POC, larger than 0.2 microns) and 200 Mega tonnes of carbon per year in dissolved OC (DOC, smaller than 0.2 microns). These estimates, however, do not account for material larger than about half a centimeter, including pieces of large wood. Few studies have investigated the large-scale patterns of wood delivery, decay, and transport in rivers, and so we have limited knowledge of how large wood influences OC discharge to the ocean. This knowledge gap leads to our primary research goals, which are to (i) quantify annual carbon discharge in the form of large wood versus other sources of DOC and POC from the Mackenzie River drainage of Canada to the Arctic Ocean and (ii) estimate storage volume, residence time, and decay rates of large wood in the drainage basin. Our focus on the Mackenzie River is based on the fact it is the largest source of river sediment and POC to the Arctic Ocean, and anecdotally has large volumes of wood moving through its delta to the ocean, but these fluxes have not been measured.The transformative aspects of the proposed research are: (1) quantification of proportions of OC exported as wood versus finer material from a large river, providing insight into the relative importance of different sources of OC under modern day conditions, and (2) the first assessment of the relative ages of material across the full range of particulate sizes carried by a large river from < 500 microns to large wood, providing a clearer basis for predicting how changes in the fate of coarser OC and large wood may impact the carbon cycle under a warming climate. This project will also substantially advance understanding of wood dynamics in large river basins under a warming climate that will alter wood recruitment, transport, and deposition processes, altering timing, volume, and placement of wood exports to the Mackenzie Delta and the Arctic.

侵蚀过程从土壤和植物中动员和输送有机碳（OC），并将其供应给河流。河流向世界海洋排放的碳在全球范围内都很重要，目前估计每年有1.6亿吨碳以颗粒OC（POC，大于0.2微米）的形式排放，每年有200兆吨碳以溶解OC（DOC，小于0.2微米）的形式排放。然而，这些估计并不包括大于半厘米的材料，包括大块木头。很少有研究调查大规模的木材输送，腐烂和运输的河流，所以我们有有限的知识如何大木材影响OC排放到海洋。这种知识差距导致我们的主要研究目标，这是（一）量化的大型木材与其他来源的DOC和POC从加拿大的麦肯齐河流域的北冰洋和（ii）估计存储量，停留时间和大型木材在流域盆地的腐烂率的形式，每年的碳排放。我们对麦肯齐河的关注是基于这样一个事实，即它是河流沉积物和POC到北冰洋的最大来源，并且有大量的木材通过其三角洲进入海洋，但这些通量尚未被测量。拟议研究的变革方面是：（1）量化一条大河中作为木材和较细材料出口的有机碳的比例，以了解现代条件下不同有机碳来源的相对重要性，以及（2）首次评估了大河携带的从< 500微米到大型木材的整个颗粒尺寸范围内材料的相对年龄，为预测气候变暖下较粗的OC和大型木材的命运变化如何影响碳循环提供了更清晰的基础。该项目还将大大促进对气候变暖下大河流域木材动态的了解，气候变暖将改变木材的补充、运输和沉积过程，改变向麦肯齐三角洲和北极出口木材的时间、数量和地点。

项目成果

Wood-Based Carbon Storage in the Mackenzie River Delta: The World's Largest Mapped Riverine Wood Deposit

麦肯齐河三角洲的木质碳储存：世界上最大的测绘河流木材矿床

• DOI: 10.1029/2022gl100913
• 发表时间: 2023
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Sendrowski A

Mapping wood deposits across the Mackenzie River Delta: Towards an understanding of delta-scale transport processes

绘制麦肯齐河三角洲木材沉积图：了解三角洲规模的运输过程

• 发表时间: 2019
• 作者: Sendrowski A

Vegetal Undercurrents-Obscured Riverine Dynamics of Plant Debris.

植物潜在的植物碎片河流动力学。

• DOI: 10.1029/2021jg006726
• 发表时间: 2022-03
• 期刊: JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
• 影响因子: 3.7
• 作者: Schwab, Melissa S.;Hilton, Robert G.;Haghipour, Negar;Baronas, J. Jotautas;Eglinton, Timothy, I
• 通讯作者: Eglinton, Timothy, I

Old Dissolved Inorganic Carbon in the Mackenzie River Basin: A Smoking gun for the Degradation of Aged Organic Matter?

麦肯齐河流域的旧溶解无机碳：老化有机物降解的铁证？

• 发表时间: 2018
• 作者: Hilton RG

Analyzing the Multi-scale Heterogeneity of Wood Depositional Environments in the Mackenzie River Delta

马更些河三角洲木材沉积环境的多尺度非均质性分析

• 发表时间: 2021
• 作者: Sendrowski A