Dissolved Organic Carbon in Coastal Waters: Global Patterns, Stocks and Environmental Physical Controls

IF 5.4 2区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Christian Lønborg, Isabel Fuentes-Santos, Cátia Carreira, Valentina Amaral, Javier Arístegui, Punyasloke Bhadury, Mariana Bernardi Bif, Maria Ll. Calleja, Qi Chen, Luiz C. Cotovicz Jr., Stefano Cozzi, Bradley D. Eyre, E. Elena García-Martín, Michele Giani, Rafael Gonçalves-Araujo, Renee Gruber, Dennis A. Hansell, Johnna M. Holding, William Hunter, J. Severino P. Ibánhez, Valeria Ibello, Piotr Kowalczuk, Federica Maggioni, Paolo Magni, Patrick Martin, S. Leigh McCallister, Xosé Anxelu G. Morán, Joanne M. Oakes, Helena Osterholz, Hyekyung Park, Digna Rueda-Roa, Jiang Shan, Eva Teira, Nicholas Ward, Youhei Yamashita, Liyang Yang, Qiang Zheng, Xosé Antón Álvarez-Salgado
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Abstract

Dissolved organic carbon (DOC) in coastal waters is integral to biogeochemical cycling, but global and regional drivers of DOC are still uncertain. In this study we explored spatial and temporal differences in DOC concentrations and stocks across the global coastal ocean, and how these relate to temperature and salinity. We estimated a global median coastal DOC stock of 3.15 Pg C (interquartile range (IQR) = 0.85 Pg C), with median DOC concentrations being 2.2 times higher than in open ocean surface waters. Globally and seasonally, salinity was the main driver of DOC with concentrations correlated negatively with salinity, without a clear relationship to temperature. DOC concentrations and stocks varied with region and season and this pattern is likely driven by riverine inputs of DOC and nutrients that stimulate coastal phytoplankton production. Temporally, high DOC concentrations occurred mainly in months with high freshwater input, with some exceptions such as in Eastern Boundary Current margins where peaks are related to primary production stimulated by nutrients upwelled from the adjacent ocean. No spatial trend between DOC and temperature was apparent, but many regions (19 out of 25) had aligned peaks of seasonal temperature and DOC, related to increased phytoplankton production and vertical stratification at high temperatures. Links of coastal DOC with salinity and temperature highlight the potential for anthropogenic impacts to alter coastal DOC concentration and composition, and thereby ecosystem status.

Abstract Image

沿海水域溶解有机碳:全球格局、储量和环境物理控制
沿海水域溶解有机碳(DOC)是生物地球化学循环的重要组成部分,但其全球和区域驱动因素仍不确定。在这项研究中,我们探讨了全球沿海海洋DOC浓度和储量的时空差异,以及它们与温度和盐度的关系。我们估计全球沿海DOC储量中位数为3.15 Pg C(四分位数范围(IQR) = 0.85 Pg C), DOC浓度中位数是开阔海洋表层水域的2.2倍。从全球和季节来看,盐度是DOC的主要驱动因素,浓度与盐度呈负相关,与温度无明显关系。DOC浓度和储量随区域和季节的变化而变化,这种模式可能是由河流输入的DOC和刺激沿海浮游植物生产的营养物质驱动的。从时间上看,高DOC浓度主要发生在淡水输入量高的月份,但也有一些例外,如东部边界流边缘,其峰值与邻近海洋上涌的营养物质刺激的初级生产有关。DOC与温度的空间变化趋势不明显,但有19个区域(25个区域中有19个)的季节温度与DOC的峰值排列一致,这与高温下浮游植物产量增加和垂直分层有关。海岸带DOC与盐度和温度的联系凸显了人为影响可能改变海岸带DOC浓度和组成,进而改变生态系统状况。
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来源期刊
Global Biogeochemical Cycles
Global Biogeochemical Cycles 环境科学-地球科学综合
CiteScore
8.90
自引率
7.70%
发文量
141
审稿时长
8-16 weeks
期刊介绍: Global Biogeochemical Cycles (GBC) features research on regional to global biogeochemical interactions, as well as more local studies that demonstrate fundamental implications for biogeochemical processing at regional or global scales. Published papers draw on a wide array of methods and knowledge and extend in time from the deep geologic past to recent historical and potential future interactions. This broad scope includes studies that elucidate human activities as interactive components of biogeochemical cycles and physical Earth Systems including climate. Authors are required to make their work accessible to a broad interdisciplinary range of scientists.
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