The Xiamen Symposium on Marine Environmental Sciences

2027 Xiamen Symposium on Marine Environmental Sciences

January 12-15, 2027

Evaluating Mesopelagic Carbon Transfer Efficiency in Low-to-Mid Latitude Oceans Using a Global UVP5 Imaging Dataset
ID:915 Poster Presentation

2027-01-15 18:30 (China Standard Time)

Session:Session 16 - Quantifying marine microbial processes in a changing ocean – synthesizing experiments/fieldwork and models/theories

Abstract
颗粒有机质通过中层暮光带(150–550米)的衰减决定了海洋生物碳泵的效率和长期碳储存。尽管幂律马丁曲线被广泛应用于建模这种垂直下降,但其指数(b值)及其驱动机制的全球尺度空间变异性仍然受限较少。本研究探讨了低纬度至中纬度海洋粒子衰减(b值)的空间模式和环境控制。我们利用了一份已发布的全球海洋颗粒粒径分布数据集,该数据集源自2008年至2022年间的原位水下视觉剖析器5(UVP5)观测数据。总颗粒浓度和生物体积剖面从颗粒尺寸谱(等效球径,ESD:0.04–26毫米)在两个不同的垂直窗口内积分:140–160米(名义出口深度)和530–570米(下中层空间)。
通过将这些垂直分辨的颗粒剖面拟合到马丁曲线,我们计算了b值,以量化跨主要海洋盆地的颗粒转移效率。应用交叉分组和相关分析来评估跨时空维度(采样年份和航线)以及关键环境梯度(海面/DCM温度和叶绿素-a水平)的b值变异。初步结果显示b值在时空上存在显著异质性,对热结构和地表初级生产力状态表现出强烈敏感性。此外,我们正在进行的工作将这些物理化学减弱模式与从塔拉海洋元数据中提取的微生物群落组成和功能基因丰度整合起来。总体而言,本研究建立了坚实的粒子衰减动力学生物地球化学基线,为将环境强迫与微生物代谢特征在全球碳循环建模中联系起来提供了关键基础。


 
Speaker
Xiwen Cui State Key Laboratory of Marine Environmental Science and College of Ocean and Earth Sciences, Xiamen University

Author
Xiwen Cui State Key Laboratory of Marine Environmental Science and College of Ocean and Earth Sciences, Xiamen University

    Important Dates

    • Jan 30

      2026

      Session / Event proposals open

    • Mar 31

      2026

      Session / Event proposals close
      (Extended to April 7)

    • Apr 30

      2026

      Session acceptance notifications

    • Apr 30

      2026

      Abstract submissions & registration open

    • Jun 30

      2026

      Abstract submissions close
      (Extended to July 21)

    • Aug 31

      2026

      Abstract acceptance notifications

    • Sep 15

      2026

      Scientific program released

    • Oct 15

      2026

      Early bird registration closes

    • Jan 12–15

      2027

      XMAS 2027