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Tracing water mass fractions in the deep western Indian Ocean using fluorescent dissolved organic matter
Marine Chemistry ( IF 3 ) Pub Date : 2019-11-06 , DOI: 10.1016/j.marchem.2019.103720
Jeonghyun Kim , Yeseul Kim , Hyoun-Woo Kang , Suk Hyun Kim , TaeKeun Rho , Dong-Jin Kang

The meridional distributions of fluorescent dissolved organic matter (FDOM) and various hydrologic properties were investigated along 67°E in the western Indian Ocean. Our results showed that the highest fluorescence of the humic FDOM (FDOMH) was discovered in the Indian Deep Water (IDW), and relatively lower values were observed in the intruding water masses from the upper layer (e.g., Circumpolar Deep Water (CDW), Antarctic Intermediate Water (AAIW), and South Indian Central Water (SICW)). The deep FDOMH was robustly correlated with apparent oxygen utilisation (AOU), as suggested by previous studies. In particular, the slopes of the regression line AOU on FDOMH varied for different water masses and the two humic components. In this study, to identify the factor inducing the variations of the slope, we estimated the relative water mass fraction of different water masses using a three-end-member mixing model with a salinity-FDOMH diagram. The distribution of water mass fractions was in good agreement with water mass distribution from the conventional method from temperature and salinity distribution and previous studies. The FDOMH components were positively correlated with the aged water mass fraction (i.e., IDW; r = 0.93) and negatively correlated with fresher ones originating from the upper water (r = −0.93, −0.51, and − 0.95 for CDW, AAIW, and SICW, respectively). The fluorescence ratio between the two FDOMH components was also observed to be linked to the water mass fractions. The results indicate that the distribution of FDOMH is attributed to the mixing of various deep-water masses during the global ocean circulation.



中文翻译:

利用荧光溶解的有机物追踪印度洋西部深层的水质量分数

在印度洋西部沿67°E方向研究了荧光溶解有机物(FDOM)的子午分布和各种水文特性。我们的结果表明,在印度深水(IDW)中发现了腐殖质FDOM(FDOM H)的荧光最高,而在上层侵入的水团中(例如,圆极深水(CDW))则观察到相对较低的值。 ,南极中间水(AAIW)和南印度中央水(SICW))。如先前的研究所表明的那样,深层FDOM H与表观氧气利用率(AOU)密切相关。特别是FDOM H上回归线AOU的斜率对于不同的水团和两种腐殖质组分,其变化也不同。在这项研究中,为了确定引起坡度变化的因素,我们使用具有盐度-FDOM H图的三端混合模型估算了不同水质的相对水质分数。从温度和盐度分布以及先前的研究来看,水质量分数的分布与常规方法中的水质量分布非常吻合。FDOM H成分与老化水质量分数(即IDW;r  = 0.93)呈正相关,而与源自上层水的较新鲜水成分呈负相关(r 对于CDW,AAW和SICW,分别为-0.93,-0.51和-0.95)。还观察到两个FDOM H组分之间的荧光比率与水的质量分数有关。结果表明,FDOM H的分布归因于全球海洋环流期间各种深水团块的混合。

更新日期:2019-11-06
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