School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, China.
School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, China; The Key Laboratory of Space Ocean Remote Sensing and Application, Ministry of Natural Resources, China.
Sci Total Environ. 2022 Sep 10;838(Pt 1):155876. doi: 10.1016/j.scitotenv.2022.155876. Epub 2022 May 17.
In this study, the interaction between the packaging effect (Q) and total chlorophyll-a concentration (C) or total size index (SI) was investigated to explore the potential bio-optical mechanism in phytoplankton cells in the global oceans. In addition, the long-term spatiotemporal characteristics of these interactions were necessary for grasping their variation. Numerous in situ surface measurements (phytoplankton pigment and absorption coefficients) from the global oceans were analyzed first, and then correlation and causality analyses were performed on the satellite-deduced Q, C, and SI in the global oceans during 2002-2020. The results show a negative correlation between Q and C or SI in the low latitudes (30°S-30°N) and a positive correlation in the middle latitudes (30°S-55°S and 30°N-55°N). The causality analysis reveals a mutual and asymmetric cause-effect relationship between Q and C or SI in the low latitudes. The stabilization effect of Q contributes to a 10%-50% variation in C and SI, with 40%-60% uncertainty of Q caused by C and SI in the low latitudes, which is inverse in the middle latitudes. The remaining contribution to each variable mainly originates from long-term trends and noise. Combining the analysis between Q and the irradiance, the balancing processes in phytoplankton cells are different in the low (phytoplankton-driving mode) and middle latitudes (irradiance-driving mode), which is related to photoacclimation and photoinhibition. The analyses provide insights into the quantitative interpretation of the relationship between Q and C or SI, which contribute knowledge that has not been previously reported.
在这项研究中，我们研究了包装效应（Q）与总叶绿素-a 浓度（C）或总大小指数（SI）之间的相互作用，以探索全球海洋浮游植物细胞中的潜在生物光学机制。此外，为了掌握其变化，还需要研究这些相互作用的长期时空特征。本研究首先分析了来自全球海洋的大量原位表面测量（浮游植物色素和吸收系数），然后对 2002-2020 年期间全球海洋中卫星反演的 Q、C 和 SI 进行了相关和因果分析。结果表明，在低纬度（30°S-30°N）地区，Q 与 C 或 SI 呈负相关，而在中纬度（30°S-55°S 和 30°N-55°N）地区则呈正相关。因果分析揭示了低纬度地区 Q 与 C 或 SI 之间存在相互的、不对称的因果关系。Q 的稳定作用导致 C 和 SI 发生 10%-50%的变化，其中 C 和 SI 引起的 Q 不确定性为 40%-60%，而在中纬度地区则相反。每个变量的剩余贡献主要来自长期趋势和噪声。结合 Q 与辐照度之间的分析，浮游植物细胞中的平衡过程在低纬度地区（浮游植物驱动模式）和中纬度地区（辐照度驱动模式）有所不同，这与光驯化和光抑制有关。这些分析为 Q 与 C 或 SI 之间关系的定量解释提供了深入的了解，为之前未报道过的知识做出了贡献。
