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.

侵蚀过程动员并从土壤和植物中传递有机碳（OC），并可以将其供应给河流。河流到世界海洋的碳排放量在全球范围内具有重要意义，目前估计颗粒OC（POC，大于0.2微米）和溶解的OC的颗粒OC（POC，大于0.2微米）和200兆吨的碳（DOC（DOC）（DOC，小于0.2微米），目前估计为160吨碳。但是，这些估计并不能说明大于大约半厘米的材料，包括大木材。很少有研究研究了河流中木材递送，腐烂和运输的大规模模式，因此我们对大型木材影响OC流向海洋有限。这些知识差距导致了我们的主要研究目标，该目标是（i）以大型木材的形式量化每年的碳排放量与其他DOC和POC来源，从加拿大Mackenzie River排水到北极海洋，以及（ii）估计排水层中大型木材的衰减速率。我们对Mackenzie河的关注是基于以下事实，它是北极海洋的河流沉积物和POC的最大来源，轶事上有大量的木材在其三角洲向海洋中移动到海洋，但这些磁通量尚未测量，但这些磁通量已被衡量。所提出的研究的变革性是：（1）较大的植物量化物质的范围是固定的，而植物的相对范围却是一定的，而植物的相对范围却是一定的，而植物的相对范围却是一定的，而植物的实质性却是一定范围的，它的范围是一定的，而植物的范围却是一定的，而却是一定的，而却是一定的，而不是木材的范围，而却是一定的，而不是木材的范围，那么又有一定的物质范围。 OC在现代条件下的来源，以及（2）对材料相对年龄的首次评估，这是一条大河从<500微米到大型木材携带的颗粒大小的相对年龄，这为预测浓缩OC和大木材命运的变化提供了更清晰的基础，这可能会在温暖气候下影响碳循环。该项目还将在温暖的气候下大大提高对大型河流盆地的木制动力学的理解，这将改变木材募集，运输和沉积过程，改变对Mackenzie Delta和Arctic的木材出口的时机，体积和放置。

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.

• 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