Paper Push: 2026-07-18
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每日论文推送：BGC-Argo、海色/海洋光学、海洋热浪与碳泵Daily Paper Push: BGC-Argo, ocean colour/ocean optics, marine heatwaves and carbon pump
本期由 GitHub Actions 自动检索生成：Nature/Science 系列优先，其次是用户指定重点期刊，再补充重点关注团队的新论文，最后纳入其他相关期刊；历史去重后保留 7 篇，不超过每日 50 篇上限。 This issue was generated automatically by GitHub Actions: Nature and Science series first, then the user-defined priority journals, then new papers from the focused team, followed by other relevant journals as topical supplements. After deduplication, 7 papers remain, below the daily limit of 50.
Download Word summary
无 mechanism sketch 图。今天的意大利语卡片： No mechanism sketch figure today. Daily Italian card:
每日一句意大利语Daily Italian
E quindi uscimmo a riveder le stelle.
Dante, Commedia, Inferno XXXIV, 139; Italian original from Kalliope
这是《地狱篇》的最后一句，意思是“于是我们走出那里，再次看见群星”。它常被用来表达穿过黑暗之后重新看见方向和希望。
This is the final line of Inferno: after passing through darkness, the travellers come out to see the stars again. It suggests recovery, orientation, and renewed hope.
趋势总结Trend Summary
本期重点关注 BGC-Argo、海色遥感/海洋光学、海洋热浪、浮游植物垂向结构和碳泵过程。筛选逻辑不再只限于重点期刊；当高影响力期刊当天新增较少时，会额外检索重点关注团队作者的新论文，并用海洋、海色/光学和碳循环关键词过滤，再从其他相关期刊补充候选论文。
This issue focuses on BGC-Argo, ocean-colour remote sensing, ocean optics, marine heatwaves, vertical phytoplankton structure and carbon-pump processes. The selection is no longer limited to priority journals; when few high-impact papers are newly available, the workflow also checks focused-team authors and filters those papers with ocean, ocean-colour/optics, and carbon-cycle keywords before adding other relevant journals as supplements.
重点期刊：按影响力和相关性排序Key journals: ordered by impact and relevance
1. A novel approach to estimate non‐algal particle absorption for improved retrieval of pigment concentrations in coastal waters
作者Authors: Margherita Costanzo; Vittorio E. Brando; Emmanuel Boss; Alison Chase; David Doxaran
发表月份Publication month: 2026-07 2026-07
Limnology and Oceanography · DOI: 10.1002/lom3.70073
关键词Tags: phytoplankton; absorption; bio-optics phytoplankton; absorption; bio-optics
摘要：浮游植物在海洋生物地球化学中发挥着核心作用，了解其组成和变异性对于监测海洋生态系统动态至关重要。沿着船迹进行连续分光光度测量（使用 Seabird Sci. AC-S）可以在大空间和时间尺度上高分辨率测量粒子光谱吸收 () 和光束衰减光谱 ()。在这里，我们提出了一种从 AC-S 数据估计非藻类颗粒吸收 () 的新方法，用于推导非藻类颗粒的光谱斜率 ()。该方法允许直接估计 的总光谱，从而推导浮游植物吸收 ()，通过从 AC-S 中减去来检索。通过已发表的高斯分解方法（Chase 等人，2017） ，海洋学方法2013； 7:110–124)，11 个相关的浮游植物色素吸收峰 () 直接源自该数据集的色素浓度并与之相关，建立新的色素关系和新系数。这种新方法可以使用 AC-S 数据改进组分之间的分解，从而更好地量化浮游植物组成，并改进叶绿素 a、b 和 c 等色素的检索。从以浮游植物为主的蓝色水域到富含悬浮颗粒物质（SPM）的沿海水域，这种改善已在具有不同光学条件的水域中进行了量化。新方法在高区域提供了最大的改进，几乎将具有这些复杂环境条件的站点的偏差减少了一半。
Abstract: Phytoplankton play a central role in ocean biogeochemistry and understanding their composition and variability is critical for monitoring marine ecosystem dynamics. Continuous spectrophotometric measurements (using a Seabird Sci. AC‐S) along ship tracks enable high‐resolution measurements of particle spectral absorption (), and beam attenuation spectra (), across large spatial and temporal scales. Here, we present a new method to estimate non‐algal particle absorption () from AC‐S data, using to derive both and the spectral slope of non‐algal particles (). This method allows the estimation of the total spectra of directly from , and consequently the derivation of phytoplankton absorption (), retrieved by subtraction from AC‐S . Through published Gaussian decomposition approach (Chase et al., Methods in Oceanography 2013; 7:110–124), 11 associated phytoplankton pigments absorption peaks () are derived directly from and related with pigment concentrations from this dataset, building new ‐pigments relationships and new coefficients. This new approach leads to improved decomposition between and components using AC‐S data, leading to a better quantification of phytoplankton composition and an improvement in the retrieval of pigments such as chlorophylls a , b and c . The improvement has been quantified in waters characterized by different optical conditions, from blue waters dominated by phytoplankton to coastal waters rich in suspended particles matter (SPM). The new method provides the greatest improvement in areas with high , almost halving the bias for stations characterized by these complex environmental conditions.
2. Assessment of Feature Selection Methods for Machine Learning-Based Chlorophyll-a Retrieval Across Optical Water Types
作者Authors: Behnaz Arabi; Masoud Moradi; Meng Lu
发表月份Publication month: 2026-07 2026-07
Remote Sensing · DOI: 10.3390/rs18142381
关键词Tags: phytoplankton; ocean colour; bio-optics phytoplankton; ocean colour; bio-optics
摘要：由于光谱冗余、非线性光学相互作用和水类型可变性，从海洋颜色反射率中准确检索叶绿素-a（Chla，mg m−3）仍然是一个具有挑战性的问题。本研究开发并评估了具有全球代表性的特征选择 (FS) 和机器学习 (ML) 框架，以改进多光谱反射率的 Chla 估计。使用聚合到中分辨率成像光谱仪 (MERIS) 波段的质量控制的原位全球数据集，我们评估了四种光水类型 (OWT) 的七种 FS 方法和五种 ML 架构。每个 OWT 相应的 FS-ML 模型都使用一种新颖的数据分区方案“空间分块分层蒙特卡罗分割”根据原位数据的分区子集进行训练和验证。利用三阶段模型评估和鲁棒性过滤器。 重要性驱动的 FS 方法始终能够生成紧凑的、物理上可解释的预测变量集，并产生最佳的泛化能力。强大的 FS-ML 组合可以以最小的训练-验证差距实现高验证性能。跨传感器传输测试表明，经 MERIS 训练的模型可以推广到独立的中分辨率成像光谱仪 (MODIS) 和 GlobColour 匹配。分布不确定性诊断进一步表征了空间和时间上的检索置信度。总体而言，OWT 自适应 FS 为从多光谱海洋颜色反射率中检索全局 Chla 提供了一种物理基础、统计稳健且可操作扩展的方法。
Abstract: Accurate retrieval of Chlorophyll-a (Chla, mg m−3) from ocean color reflectance remains a challenging issue due to spectral redundancy, nonlinear optical interactions, and water type variability. This study develops and evaluates a globally representative feature selection (FS) and machine learning (ML) framework to improve Chla estimation from multispectral reflectance. Using a quality-controlled in situ global dataset aggregated to Medium Resolution Imaging Spectrometer (MERIS) bands, we evaluate seven FS methods and five ML architectures across four optical water types (OWTs). The corresponding FS-ML models for each OWT are trained and validated based on partitioned subsets of in situ data using a novel data-partitioning scheme, ‘Spatially Blocked Stratified Monte-Carlo Split’. A three-stage model evaluation and a robustness filter are utilized. Importance-driven FS methods consistently produce compact, physically interpretable predictor sets and yielded the best generalization. Robust FS–ML combinations achieve high validation performance with minimal training–validation gaps. Cross-sensor transfer tests indicate that the MERIS-trained models could be generalized to independent Moderate Resolution Imaging Spectroradiometer (MODIS) and GlobColour matchups. Distributional uncertainty diagnostics further characterize retrieval confidence spatially and temporally. Overall, the OWT-adaptive FS provides a physically grounded, statistically robust, and operationally scalable approach for global Chla retrieval from multispectral ocean color reflectances.
重点关注团队Focused team
3. Adverse outcome pathways of titanium dioxide nanoparticles and marine heatwaves on byssal performance in mussels
作者Authors: Shuaishuai Wei; Zhihan Tu; Inna Sokolova; Liming Chen; Shixiu Wang; Menghong Hu; Youji Wang
发表月份Publication month: 2026-07 2026-07
Eco-Environment & Health · DOI: 10.1016/j.eehl.2026.100265
关键词Tags: marine heatwaves marine heatwaves
摘要：Crossref 未提供该 DOI 的摘要。
Abstract: Crossref did not provide an abstract for this DOI.
4. Projected future warming induces a long-term loss in global dissolved organic carbon pool
作者Authors: Jerry F. Tjiputra; Xosé A. Álvarez-Salgado; Richard Sanders; Damien Couespel
发表月份Publication month: 2026-07 2026-07
Communications Earth & Environment · DOI: 10.1038/s43247-026-03809-0
关键词Tags: microbial carbon microbial carbon
摘要：溶解有机碳是海洋中最大的碳还原库，但其对气候变化的敏感性及其对海洋生物地球化学的影响仍知之甚少。在这里，我们在地球系统模型中实施了四个溶解有机碳库，其具有根据经验得出的不同反应性和寿命，以研究它们的全球分布、影响和对气候变化的响应。耐火池的寿命长达数千年，改善了老化水体中低氧、高营养条件的模型表征。在高度变暖的情况下，预计所有溶解有机碳库都会大幅减少。这导致有机养分净转化为再矿化养分，这可能对初级生产的未来变化产生影响。 无论是未来的弱变暖还是强变暖，该模型都预测全球溶解有机碳库会出现长期损失，这种损失在百年时间范围内是不可逆转的，这凸显了维持观测和改进模型表征的必要性。
Abstract: Dissolved organic carbon is the largest reservoir of reduced carbon in the ocean but its sensitivity to climate change and consequent impacts on ocean biogeochemistry remain poorly understood. Here, we implement four dissolved organic carbon pools with the empirically-derived varying reactivities and lifetimes in an Earth system model to investigate their global distribution, impacts, and responses to climate change. The refractory pool, which has a lifetime of several thousand years, improves the model representations of low oxygen, high nutrient conditions in aged water masses. Under a high warming scenario, substantial decreases are projected across all dissolved organic carbon pools. This leads to a net conversion of organic to remineralised nutrients, which could have an effect on future changes in primary production. Under both weak and strong future warming, the model projects a long-term loss in the global dissolved organic carbon pool that is irreversible over centennial time scale, highlighting the need to sustain observations and improve model representations.
5. Spatial-temporal distribution of phytoplankton community and HAB species in the pelagic waters of South China Sea and its typical tropical islands
作者Authors: Jian Zou; Yayuan Xiao; Yu Liu; Peng Wu; Teng Wang; Sheng Liu; Jian Guan; Shannan Xu; et al.
发表月份Publication month: 2026-07 2026-07
Marine Environmental Research · DOI: 10.1016/j.marenvres.2026.108285
关键词Tags: phytoplankton phytoplankton
摘要：Crossref 未提供该 DOI 的摘要。
Abstract: Crossref did not provide an abstract for this DOI.
其他相关期刊：按主题相关性补充Other relevant journals: topical supplements
6. Antarctic phytoplankton and krill diet, 1955–1963: observations from a poorly known era of Southern Ocean change
作者Authors: Alexandr I. Ivanov; Oleksandr Goncharov; Olena Bilous; Sergii Khutornoi; Yuriy Yurchenko
发表月份Publication month: 2026-07 2026-07
Antarctic Science · DOI: 10.1017/s0954102026100777
关键词Tags: phytoplankton; ocean colour phytoplankton; ocean colour
摘要：了解南极海洋生态系统的当代变化需要对卫星遥感和现代监测计划之前的早期时期进行定量观测。在这里，我们提供了 1955 年至 1963 年期间在南大洋（南纬 50-68°）的大西洋、印度洋和太平洋区域收集的浮游植物群落定量数据和南极磷虾饮食分析，这一时期记录很少，但其本身也发生了重大变化，包括大规模捕鲸的后期阶段和二十世纪中叶南极海冰范围的缩小。对561个浮游植物样本的分析发现，有150个以大型硅藻为主的类群，约占99个。总生物量的7%。 浮游植物生物量表现出明显的空间变异性，体积和深度积分值的升高与以融水引起的分层为特征的冰缘过渡区一致相关。 在冰缘过渡区，上部 0-100 m 的深度综合生物量通常超过 100 g m -2 。 最广泛分布的物种是 Corethron pennatum (Grunow) Ostenfeld（87% 出现）、Rhizosolenia hebetata f. semispina (Hensen) Gran (83%) 和 Fragilariopsis kerguelensis (O’Meara) Hustedt (68%)，反映了与水体特征和养分供应相关的部门差异。 根据生物量优势确定了 18 个浮游植物群落复合体：以 R. 赫贝塔塔 f. semispina 在大西洋区域盛行，而 C. 羽叶复合体在印度洋和太平洋地区最为常见。 对 425 个南极磷虾样本的肠道内容物分析表明，大小选择性摄食，优先保留小型羽状硅藻（5-20 μm），而大型硅藻主要表现为机械破碎的硅藻壳，这与摄入过程中的下颌加工一致。与当代观察结果的比较表明，尽管核心硅藻类群仍然存在，但区域细胞向更小的转变、水华物候的改变和磷虾种群的减少表明生态系统正在重组。这些观测结果为评估南大洋快速变化（包括今天发生的变化事件）的生物反应提供了环极参考。
Abstract: Understanding contemporary changes in Antarctic marine ecosystems requires quantitative observations from earlier periods that predate satellite remote sensing and modern monitoring programmes. Here, we present quantitative phytoplankton community data and Antarctic krill diet analyses collected across the Atlantic, Indian and Pacific sectors of the Southern Ocean (50–68°S) during 1955–1963 - a poorly documented period that itself encompassed substantial change, including the latter phase of large-scale whaling and the mid-twentieth-century reduction in Antarctic sea-ice extent. Analysis of 561 phytoplankton samples revealed 150 taxa dominated by large diatoms, which accounted for ~99.7% of total biomass. Phytoplankton biomass showed pronounced spatial variability, with elevated volumetric and depth-integrated values consistently associated with ice-edge transitional zones characterized by meltwater-induced stratification. Depth-integrated biomass for the upper 0–100 m commonly exceeded 100 g m −2 at ice-edge transitional zones. The most widespread species were Corethron pennatum (Grunow) Ostenfeld (87% occurrence), Rhizosolenia hebetata f. semispina (Hensen) Gran (83%) and Fragilariopsis kerguelensis (O’Meara) Hustedt (68%), reflecting sectoral differences linked to water mass characteristics and nutrient supply. Eighteen phytoplankton community complexes were identified based on biomass dominance: assemblages dominated by R. hebetata f. semispina prevailed in the Atlantic sector, whereas C. pennatum complexes were most common in the Indian and Pacific sectors. Gut content analysis of 425 Euphausia superba specimens demonstrated size-selective feeding, with preferential retention of small pennate diatoms (5–20 μm), whereas large diatoms appeared predominantly as mechanically fragmented frustules, consistent with mandibular processing during ingestion. Comparison with contemporary observations indicates that, although core diatom taxa persist, regional shifts towards smaller cells, altered bloom phenology and declining krill populations point to ongoing ecosystem reorganization. These observations provide a circumpolar reference for evaluating biological responses to rapid Southern Ocean change, including the episodes of change occurring today.
7. Impact of deployment duration of surface-tethered sediment traps on downward flux rates of chlorophyll a and particulate organic carbon
作者Authors: Ingrid Wiedmann; Emma Persson; Camilla Svensen; Rolf Gradinger; Marit Reigstad; Angelika H. H. Renner
发表月份Publication month: 2026-07 2026-07
Elem Sci Anth · DOI: 10.1525/elementa.2025.00103
关键词Tags: phytoplankton; microbial carbon phytoplankton; microbial carbon
摘要：每日向下通量的现场测量对于了解海洋生态系统动态以及为区域和全球碳通量模型提供输入和参考数据至关重要。短期表面系留沉积物捕集器通常用于量化上部水柱的向下通量，但使用了不同的部署持续时间（2-360 小时）。在这项在欧洲（亚）北极的五个地点进行的研究中，我们调查了这种沉积物捕集器量化的向下通量在较长（20-24 小时）和较短（2-7 小时）部署后是否具有可比性。我们的数据表明，由较短的部署确定的叶绿素a和颗粒有机碳的每日向下通量平均比较长的部署估计的通量高四倍。 圆筒处理的差异（预先填充过滤海水或留空）、向下通量的每日或昼夜变化以及微生物或浮游动物的放牧都不能解释观察到的较短和较长部署之间的向下通量差异。因此，我们推测这种差异可能是由于方法上的差异造成的，这种差异通过错误传播和放大，对较短的部署产生相对较强的影响。在确定向下通量测量对部署持续时间敏感的根本原因之前，我们建议在比较不同的向下通量研究和/或在模型中使用通量数据时考虑部署持续时间。 我们还建议使用大约 24 小时的持续时间进行表面系留沉积物捕集器的部署，以确定每日向下通量作为建立每日通量的最合适值。如果在逻辑上不可能，我们建议对一项研究中的所有部署使用相似的持续时间，以确保可比性。
Abstract: Field measurements of daily downward fluxes are crucial for understanding marine ecosystem dynamics and for providing input and reference data for regional and global carbon flux models. Short-term surface-tethered sediment traps are often used to quantify the downward flux in the upper water column, but different deployment durations have been used (2–360 h). In this study, conducted at five locations in the European (sub-)Arctic, we investigated whether the downward flux quantified by this type of sediment trap is comparable after longer (20–24 h) and shorter (2–7 h) deployments. Our data suggest that the daily downward flux of chlorophyll a and particulate organic carbon determined by shorter deployments was, on average, four times higher than the flux estimated by longer deployments. Neither differences in treatment of the cylinder (pre-filled with filtered seawater or left empty), daily or diurnal variations of the downward flux, nor microbial or zooplankton grazing explained the observed differences in downward flux between the shorter and longer deployments. We therefore speculate that the difference may be caused by a methodological dissimilarity which, through error propagation and magnification, has a relatively stronger effect on shorter deployments. Until the underlying reason is identified as to why downward flux measurements are sensitive to deployment duration, we recommend considering the deployment duration when comparing different downward flux studies and/or using flux data in models. We also recommend using a duration of approximately 24 h for surface-tethered sediment trap deployments to determine daily downward fluxes as the most adequate for establishing a daily flux. If not possible logistically, we suggest using a similar duration for all deployments within one study to ensure comparability.
