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首页> 外文期刊>Journal of oceanography >Determination of the freshwater origin of Coastal Oyashio Water using humic-like fluorescence in dissolved organic matter
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Determination of the freshwater origin of Coastal Oyashio Water using humic-like fluorescence in dissolved organic matter

机译：腐殖质样荧光在溶解有机物中测定沿海八潮水的淡水来源

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Coastal Oyashio Water (COW), defined as a water mass with a temperature lower than 2?°C and a salinity lower than 33.0, is distributed in the North Pacific Ocean off southeastern Hokkaido, Japan, from winter to spring. COW is rich in macronutrients and dissolved iron and is thus considered to affect the spring phytoplankton blooms in the Oyashio region. Although river water and sea-ice melt water have been considered freshwater end-members of COW, the contributions of these freshwater sources to COW have not been well described. In this study, the humic-like components in dissolved organic matter were first applied as a parameter to evaluate the freshwater end-members of COW in March 2015. Linear regressions with negative slopes were determined between the humic-like components and the salinity of COW. The intercepts of the regressions against the humic-like components were within the ranges of those observed for the local rivers of Hokkaido but were very different from those of sea ice. These findings suggest that river water contributed to the COW observed here as a freshwater end-member, although the contribution of sea-ice melt water to COW could not be evaluated. This novel approach also highlighted two different less-saline water masses in COW. The first was characterized by a lower temperature and relatively high levels of humic-like components, while the second was higher in temperature and had higher levels of humic-like components. It is suggested that these different characteristics are due to the contributions of water from different rivers and/or different effects of sea-ice melt water.
机译：Oyashio沿海水（COW）是指温度低于2？C，盐度低于33.0的水团，从冬季到春季分布在日本北海道东南部的北太平洋。 COW富含大量营养素和溶解的铁，因此被认为会影响Oyashio地区春季浮游植物的开花。尽管河水和海冰融化水被认为是COW的淡水终端成员，但这些淡水源对COW的贡献尚未得到很好的描述。在这项研究中，首先在2015年3月将溶解有机质中的腐殖质类成分作为参数来评估COW的淡水末端成员。在腐殖质类成分和COW盐度之间确定了具有负斜率的线性回归。对腐殖质样成分的回归截距在北海道当地河流观测的范围内，但与海冰截然不同。这些发现表明，尽管无法评估海冰融化水对COW的贡献，但河水作为淡水终端成员对COW的贡献。这种新颖的方法还突出了COW中两个不同的盐度较低的水团。第一个特征是较低的温度和相对较高水平的腐殖质类成分，而第二个特征是温度较高且具有较高的腐殖质类成分。建议这些不同的特性归因于来自不同河流的水的贡献和/或海冰融化水的不同影响。

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