学术论文｜西北太平洋黑潮−亲潮延伸体海域的沉积有机碳来源及储量

政务 2024-11-12 16:51 辽宁

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作者：崔咏晖、丁杨、陈朝晖、肖晓彤
单位：中国海洋大学深海圈层与地球系统前沿科学中心/海洋化学理论与工程技术教育部重点实验室、崂山实验室、中国海洋大学深海圈层与地球系统前沿科学中心/物理海洋教育部重点实验室
DOI：10.12111/j.mes.2023-x-0267

中文摘要

西北太平洋是全球CO₂的重要汇区，在海洋气候调节中起关键作用，其海洋生态系统的固碳和储碳过程对生产力的输出和储存有重要意义。本文测定了西北太平洋黑潮−亲潮延伸体海域沉积柱的总有机质参数（TOC、C/N和δ¹³C）和海源生物标志物含量（菜籽甾醇、甲藻甾醇和长链烯酮），并通过端元混合模型估算出该海域的有机质以海源贡献为主，平均可达80%以上。此外，本文估算了沉积物的有机碳储量来评估研究海域的储碳能力，结果显示，位于黑潮延伸体、混合海域和亲潮延伸体沉积柱的碳储量分别为14 t/ha、28 t/ha和21 t/ha（1 m深度），尽管这个结果远低于全球海洋平均碳储量，但和其他深海区域（如北大西洋中部和北太平洋中部）相比碳储量较高。因此，了解并重视该海域的有机碳埋藏情况对于缓解大气中日益增加的二氧化碳引起的温室效应具有重要意义。

关键词：

西北太平洋；黑潮−亲潮延伸体；有机碳来源；碳储量

Abstract

The Northwest Pacific is an important sink of global CO₂, which plays a key role in climate regulation. The carbon sequestration and storage processes of marine ecosystems in the Northwest Pacific are of great significance for the export and storage of primary productivity. The total organic carbon contents (TOC), stable carbon isotope (δ¹³C), and marine biomarkers (brassicasterol, dinosterol and C₃₇-alkenones) were measured in sediment cores of the Kuroshio-Oyashio Extension in the Northwest Pacific. The binary end-member mixing model was used to estimate the terrestrial and marine contributions of TOC, suggesting that sedimentary OC in this area is mainly from marine sources, with an average proportion more than 80%. In addition, carbon stock was calculated to evaluate the capacity of storing carbon in the study area. The results show that average carbon stock is 14 t/ha, 28 t/ha and 21 t/ha in Kuroshio Extension, mixed water region and Oyashio Extension (at 1 m), respectively. These values are much lower than the global average, but higher than the pelagic areas, e.g., central North Atlantic and central North Pacific. Therefore, understanding and emphasizing organic carbon burial in this area is of great significance for alleviating the greenhouse effect caused by the increasing CO₂ in the atmosphere.

Key words：

Northwest Pacific; Kuroshio-Oyashio Extension; the origin of organic carbon; carbon stocks

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来源：《海洋环境科学》

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