太平洋北极地区悬浮颗粒的组成和来源
Xiaoguo Yu1, Liming Ye1, Yeping Bian1
1Key Laboratory of Submarine Geosciences & Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, 310012, China.
Marine environmental research
|August 13, 2023
概括
这项研究调查了北极的有机物质来源,发现陆地物质在地表水中占主导地位,被运往北方. 垂直分层阻碍了向下运动,影响了这种不断变化的环境中的生物地球化学循环.
科学领域:
- * 海洋地质化学
- * 北极海洋学研究
- * 生物地质化学循环
背景情况:
- *北冰洋是一个快速变化的环境,对全球生物地球化学循环有重大影响.
- *了解有机物质的来源和运输对于预测生态系统动态至关重要.
研究的目的:
- * 调查贝林海和北冰洋西部的地表和地下水中的有机物质的分布和来源.
- * 分析分层对颗粒物垂直传输的影响.
主要方法:
- * 在2014年和2016年中国北极探险 (CHINARE) 期间收集悬浮颗粒物 (SPM).
- *分析了SPM度,有机颗粒碳 (POC) 和 (PN),以及稳定的碳同位素组成 (δ13C).
- * 用扫描电子显微镜检查粒子样本.
主要成果:
- * SPM和POC度显示出地理分区和时间变化,在近岸,架裂和海冰边缘处的较高值.
- *陆地有机物被确定在地表水中,特别是在圣劳伦斯岛以南和北73度以北,以较轻的δ13C值表示.
- * 垂直分层阻碍了陆地物质的向下运输,在极地混合层和上环氧层的交叉点观察到独特的δ13C值.
结论:
- * 陆地来源对太平洋北极地表水中的有机物有着显著的贡献.
- *海洋分层在控制有机颗粒物垂直分布和运输方面发挥着关键作用.
- * 发现为太平洋北极地区的生物地化学过程和生态系统功能提供了关键的见解.
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