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Evaluation of environmental proxies based on long chain alkyl diols in the East China Sea
Organic Geochemistry ( IF 3 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.orggeochem.2019.103948
Linghui He , Manyu Kang , Dongrong Zhang , Guodong Jia

Abstract Long chain alkyl diols (LCDs) in marine environments are useful indicators of source organisms, ambient temperature, upwelling and nutrient conditions. However, the distribution of LCDs in the western Pacific marginal seas has been rarely reported, where wide shallow continental shelves and huge freshwater input from many rivers occur. In this study, we analyzed LCDs in surface sediments distributed from the Changjiang River estuary (CRE) to the East China Sea shelf to evaluate their sources and associated environmental proxies. Our results showed that the fractional abundance of C32 1,15-diol (FC32 1,15-diol) was highest in coastal area close to the CRE, with FC32 1,15-diol > 15% implying significant freshwater input. The C28 and C30 1,13-diols showed a similar spatial distribution to the C32 1,15-diol, suggesting that the long chain diol index (LDI), a sea surface temperature (SST) proxy, may be biased by freshwater-derived diols. By excluding the freshwater-influenced samples (i.e., FC32 1,15-diol > 15%), LDI reflected the autumn SST, yielding minimum temperature residuals (0.2 ± 1.5 °C). The C28, C30 and C30:1 1,14-diols were abundant in the mid-depth (15–45 m) offshore environment that was affected only slightly by the Changjiang River plume, and decreased toward both the eutrophic estuarine and oligotrophic marine environments; whereas the C28:1 1,14-diol showed higher fractional abundances close to the CE. The spatial distribution of 1,14-diols is similar to that reported for Proboscia diatoms in this region, although the exact sources of 1,14-diol requires further study. Nutrient proxies based on 1,14-diols did not correlate well with nutrient concentrations in this river-dominated marginal sea, where nutrient supply is dominated by the Changjiang River input.

中文翻译:

基于长链烷基二醇的东海环境代理评价

摘要 海洋环境中的长链烷基二醇 (LCD) 是生物源、环境温度、上升流和营养条件的有用指标。然而,LCD在西太平洋边缘海的分布鲜有报道,那里有广阔的浅大陆架和来自许多河流的大量淡水输入。在这项研究中,我们分析了从长江口 (CRE) 到东海陆架分布的表层沉积物中的 LCD,以评估它们的来源和相关的环境代理。我们的结果表明,C32 1,15-二醇(FC32 1,15-二醇)的丰度分数在靠近 CRE 的沿海地区最高,其中 FC32 1,15-二醇 > 15% 意味着大量的淡水输入。C28 和 C30 1,13-二醇显示出与 C32 1,15-二醇相似的空间分布,表明长链二醇指数(LDI)是海面温度(SST)的代表,可能会受到淡水衍生的二醇的影响。通过排除受淡水影响的样品(即 FC32 1,15-二醇 > 15%),LDI 反映了秋季海温,产生最低温度残差(0.2 ± 1.5 °C)。C28、C30 和 C30:1 1,14-二醇在受长江羽流影响较小的中深度(15-45 m)近海环境中含量丰富,并向富营养化河口和贫营养海洋环境减少; 而 C28:1 1,14-二醇在 CE 附近显示出更高的丰度分数。1,14-二醇的空间分布与该地区长鼻硅藻的报道相似,但 1,14-二醇的确切来源需要进一步研究。基于 1 的营养替代物,
更新日期:2020-01-01
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