期刊
GLOBAL BIOGEOCHEMICAL CYCLES
卷 27, 期 4, 页码 1151-1162出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GB004634
关键词
North Atlantic; dark ocean; mineralization; hetertrophic activity; mixing; prokaryotes
资金
- Spanish Ministry of Science and Innovation (MALASPINA expedition) [CSD2008-00077]
- Austrian Science Fund (FWF: PADOM project) [P23221-B11]
- Earth and Life Science Division of the Dutch Science Foundation (ALW-NWO) [835.20.023, 811.33.004]
- Austrian Science Fund (FWF) [P23221, Z194] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [P 23221, P 23234, Z 194] Funding Source: researchfish
The extent to which water mass mixing contributes to the biological activity of the dark ocean is essentially unknown. Using a multiparameter water mass analysis, we examined the impact of water mass mixing on the nutrient distribution and microbial activity of the Northeast Atlantic Deep Water (NEADW) along an 8000km long transect extending from 62 degrees N to 5 degrees S. Mixing of four water types (WT) and basin scale mineralization from the site where the WT where defined to the study area explained up to 95% of the variability in the distribution of inorganic nutrients and apparent oxygen utilization. Mixing-corrected average O-2:N:P mineralization ratios of 127(11):13.0(0.7):1 in the core of the NEADW suggested preferential utilization of phosphorus compounds while dissolved organic carbon mineralization contributed a maximum of 20% to the oxygen demand of the NEADW. In conjunction with the calculated average mineralization ratios, our results indicate a major contribution of particulate organic matter to the biological activity in the NEADW. The variability in prokaryotic abundance, high nucleic acid containing cells, and prokaryotic heterotrophic production in the NEADW was explained by large scale (64-79%) and local mineralization processes (21-36%), consistent with the idea that deep-water prokaryotic communities are controlled by substrate supply. Overall, our results suggest a major impact of mixing on the distribution of inorganic nutrients and a weaker influence on the dissolved organic matter pool supporting prokaryotic activity in the NEADW.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据