NI: Benthos of the Arctic as a Storage reservoir for sea-Ice Carbon

NI：北极底栖动物作为海冰碳储存库

• 批准号: NE/S007245/1
• 负责人: Thomas Brown
• 金额: $ 10.31万
• 依托单位: Scottish Association For Marine Science
• 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%2FS007245%2F1
• 关键词: NI; Benthos; Arctic; Storage; reservoir

Sea ice extent in the Arctic Ocean has seen a steady decline since satellite-borne measurements began in the late 1970s. Sea ice supports the growth of ice algae, a fundamental component of the Arctic carbon cycle, providing food to Arctic animals. When sea ice melts every spring, ice algae are released to the water where they are either consumed by pelagic animals, or sink to the seafloor. Gaining an accurate understanding of these pathways for this important energy rich carbon resource represents a major scientific challenge that holds the key to understanding the future of Arctic ecosystems. However, until recently, this has not been possible because of the challenges associated with distinguishing sea ice carbon from other similar sources of carbon, such as phytoplankton. Having recently overcome these challenges in the last 3 years, it is now possible to unambiguously trace the pathway of sea ice-derived carbon. Recent findings have therefore shown that sea ice-derived carbon can be found in Arctic animals year-round. This is believed to be because excess (not consumed during sinking) sea ice-derived carbon that sinks can also become 'stored' within sediments where it can remain available as a food source to animals year-round. Consequently, if this idea is correct, our present assumption of the role sea ice carbon plays in the ecosystem is severely underestimating its importance.This project will bring together the expertise of British, Canadian and American scientists in a new collaborative partnership to assess whether the seafloor (e.g. rock, sand, mud, silt) acts as a 'store' of Arctic sea ice-derived primary production that can be considered available for marine animals to consume. Completion of the project aims relies upon collaboration between Brown's established (Mundy) and new (Iken) links within the assembled team. We will carry out studies on the marine region around Southampton Island, northwest Hudson Bay (Nunavut) which encompasses one of Canada's largest summer and winter aggregations of Arctic marine mammals. By sharing resources with a funded Canadian research project we will access a unique field site to collect primary preliminary data to improve understanding of ecosystem structure and function. Our findings will be relevant to the whole Arctic region and so will stimulate new research interests on an international scale.

自20世纪70年代末卫星测量开始以来，北冰洋的海冰面积一直在稳步下降。海冰支持冰藻的生长，冰藻是北极碳循环的基本组成部分，为北极动物提供食物。当每年春天海冰融化时，冰藻被释放到水中，它们要么被远洋动物吃掉，要么沉入海底。准确了解这一重要能源丰富的碳资源的这些途径是一项重大的科学挑战，是了解北极生态系统未来的关键。然而，直到最近，这还不可能实现，因为将海冰碳与其他类似碳来源（例如浮游植物）区分开来存在挑战。在过去三年中克服了这些挑战之后，现在可以明确地追踪海冰衍生碳的路径。因此，最近的研究结果表明，北极动物全年都可以发现海冰衍生的碳。这被认为是因为多余的（在下沉过程中没有消耗）海冰衍生的碳也可以“储存”在沉积物中，在那里它可以全年作为动物的食物来源。因此，如果这一想法是正确的，我们目前对海冰碳在生态系统中所起作用的假设严重低估了它的重要性。该项目将汇集英国、加拿大和美国科学家的专业知识，建立一个新的合作伙伴关系，评估海底是否（例如岩石、沙子、泥浆、淤泥）充当北极海冰衍生初级产品的“储存库”，可以被认为可供海洋动物食用。该项目目标的完成依赖于布朗的既定（芒迪）和新的（伊肯）之间的合作，在组装团队的联系。我们将对哈德逊湾（努纳武特）西北部的南安普顿岛周围的海洋区域进行研究，该区域是加拿大夏季和冬季北极海洋哺乳动物最大的聚集地之一。通过与一个受资助的加拿大研究项目共享资源，我们将访问一个独特的实地站点，收集主要的初步数据，以提高对生态系统结构和功能的理解。我们的发现将与整个北极地区相关，因此将在国际范围内激发新的研究兴趣。