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Long-term interaction between dynamics of marine organic pools and earth's surface bioelemental cycles

海洋有机库动态与地球表面生物元素循环之间的长期相互作用

基本信息

批准号：
14103001
负责人：
TANOUE Eiichiro
金额：
$ 74.63万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (S)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2006
项目状态：
已结题

项目摘要

The measurements of fluorescent intensity derived from marine humic-like materials and ^<14>C of dissolved lipids as well as dissolved organic carbon (DOC) were carried out in 2006 fiscal year for better understanding the dynamics of marine organic matter pool. The results are summarized as follows.Fluorescence dissolved organic matter (FDOM) was selected as a representative of major component of DOM in quantity but chromatographically-uncharacterizable component in quality, and the basin scale distribution of fluorescent intensity were clarified. The lowest fluorescent intensity was always found in surface waters, and it increased with increasing depth. The distribution of FDOM was similar to the of apparent oxygen untilization (AOU), and they are positively correlated in the mesopelagic and abyssal layers, indicating that FDOM is in situ produced to biological degradation of organic matter and is bio-refractory for〜900 yr. The production rate of FDOM is comparable to riverine input of DOC and burial rate of organic carbon to sediment.^<14>C concentration of dissolved lipid and DOC collected from the depth of 5 m were 72.32 ± 2.01 pMC (2600 yr BP), 93.48 ± 2.03 pMC (540 yr BP), respectively, at the innermost station in Ise Bay, and were 41.31 ± 1.64 pMC (7100 yr BP) and 95.25±2.09 pMC (390 yr BP), respectively, at the station on the mouth of Sagami Bay. Interestingly, ^<14>C concentrations of lipid were commonly lower than those of DOC, implying that the dynamics of dissolved lipid and bulk dissolved organic matter were different each other.

为了更好地了解海洋有机质池的动态，在2006财年进行了海洋类腐殖质的荧光强度和溶解脂质和溶解有机碳的^&lt；14&gt；C的测量。研究结果表明，荧光溶解有机物(FDOM)是DOM中数量最多、质量最难表征的主要成分，并明确了荧光强度的流域尺度分布。表层水体的荧光强度最低，且随深度的增加而增大。FDOM的分布与表观氧解作用(AOU)相似，且在中层和深海层呈正相关，表明FDOM是有机质生物降解的原位产物，是生物难降解的产物，可持续约900年。FDOM的产生率与河流输入的DOC和有机碳对沉积物的埋藏率相当，在伊势湾最内侧站，5m深处的溶解脂和DOC浓度分别为72.32±2.01PMC(260yrBP)、93.48±2.03PMC(540yrBP)和41.31±1.64PMC(7100yrBP)和95.25±2.09PMC(390yrBP)。有趣的是，脂类的14&gt；C浓度普遍低于DOC的浓度，这意味着溶解的脂类和整体溶解的有机物的动态是不同的。