Deep-Sea Research Part I-Oceanographic Research Papers最新文献_第3页

Evaluation of present-day hydrodynamic processes associated to the Belgica Mound contourite drift, offshore Ireland 爱尔兰近海比利时丘（Belgica Mound）轮廓岩漂移的现代水动力过程评价

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2025-12-11 DOI: 10.1016/j.dsr.2025.104640

Alice O. Matossian , Eoghan Daly , Sheena Fennell , Nadzeya Shymbaliova , Thomas Vandorpe , Martin White , David Van Rooij

The Belgica Mound Drift is a contourite drift located in the Porcupine Seabight, offshore Ireland, formed in association with cold-water coral mounds.

ROV imagery and bathymetry provided a close-up view of the drift seafloor, identifying multiple bedforms, including sinuous, linguoid and washed-out ripples as well as sediment waves. Three moorings equipped with current meters were deployed to better understand the spatial and temporal variations of the present-day hydrodynamic conditions over the drift moats and crest. Several velocity flows, ranging from 20 to 100 cm/s, were deduced from the interpretation of the bedforms and compared with the mooring-recorded flow values and character to evaluate the representativeness of the bedforms as a tool in the assessment of the strength and direction of bottom currents in deep environments. Both the tidally forced flows up to 50 cm/s, and the observed flow directions are consistent with the bedform estimation. While bedforms which require weaker bottom currents are currently formed during every tidal flow, the ripples created under stronger flows may be relic features formed during unrecorded peak flow events. This suggests that the drift and its moats are still being influenced by a strong hydrodynamic regime.

The spatial distribution of the bedforms suggests that the bottom current flow velocities are extremely variable, partly supported by the measured currents. This is likely related to the local topography which may have a very small spatial scale impact on the bottom flows.

比利时丘漂移是一个轮廓岩漂移，位于爱尔兰近海豪猪湾，与冷水珊瑚丘形成联系。ROV图像和测深技术提供了漂移海底的近距离视图，识别了多种床型，包括弯曲、舌状、冲刷波纹以及沉积物波。为了更好地了解漂移护城河和波峰上当前水动力条件的时空变化，部署了三个配备了流速计的系泊设施。通过对床型的解释，推导出了20 ~ 100 cm/s的速度流，并与系泊记录的流量值和特征进行了比较，以评价床型作为评估深海环境中底流强度和方向的工具的代表性。潮汐强迫流量均达到50 cm/s，观测到的流动方向与估算的床型基本一致。虽然需要较弱底流的河床在每次潮汐期间形成，但在较强的水流下产生的波纹可能是在未记录的峰值水流事件期间形成的遗迹特征。这表明，漂移及其护城河仍然受到强大的水动力体制的影响。河床的空间分布表明，底部水流速度变化很大，部分受到实测水流的支持。这可能与当地地形有关，地形对底部水流的空间尺度影响很小。

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引用次数: 0

Seasonal sea surface temperature variability in the northwestern Indian ocean 西北印度洋的季节性海面温度变化

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2025-12-11 DOI: 10.1016/j.dsr.2025.104641

Hongxuan Pan , Hongwei Liu , Yongliang Duan , Chongguang Pang

This study investigates the seasonal variability and underlying mechanisms of sea surface temperature (SST) in the Somali upwelling region of the northwestern tropical Indian Ocean (TIO), based on high-resolution ocean reanalysis and observational datasets. Motivated by the distinct bimodal SST cycle in this region — featuring two warming (spring and autumn) and two cooling (summer and winter) periods — we conduct a detailed mixed-layer heat budget analysis to quantify the relative contributions of atmospheric forcing and oceanic processes. While net surface heat flux (NSHF) dominates both warming phases, the underlying mechanisms differ significantly. For spring warming, it is primarily driven by increased shortwave radiation and weakened winds. In contrast, autumn warming — despite stronger NSHF — is partially offset by vertical entrainment and horizontal advection. For the cooling phases, summer SST decline is driven by dynamic oceanic processes such as vertical entrainment and horizontal advection under the southwest monsoon, while winter cooling is controlled mainly by enhanced latent heat loss. Compared to the Java upwelling region, which displays a weaker unimodal SST pattern, the Somali system exhibits more complex monsoon–ocean interactions. While earlier basin-scale modeling studies have identified general seasonal controls in the northern Indian Ocean, our region-specific, observation-constrained analysis uncovers pronounced asymmetries between distinct warming and cooling phases. These findings emphasize the critical role of monsoon-driven, phase-dependent air–sea interactions in shaping the seasonal SST variability in the northwestern TIO.

基于高分辨率海洋再分析和观测资料，研究了热带印度洋西北部索马里上升流区海温（SST）的季节变化及其机制。由于该地区独特的双峰海温循环-具有两个增温期（春季和秋季）和两个降温期（夏季和冬季）-我们进行了详细的混合层热收支分析，以量化大气强迫和海洋过程的相对贡献。虽然净地表热通量（NSHF）在两个增温阶段都占主导地位，但潜在的机制却有显著差异。对于春季变暖，主要是由于短波辐射增加和风力减弱。相比之下，尽管NSHF较强，但秋季变暖被垂直夹带和水平平流部分抵消。在降温阶段，夏季海温下降主要受西南季风垂直夹带和水平平流等海洋动力过程驱动，而冬季降温主要受潜热损失增强控制。与爪哇上升流区单峰海温模式较弱相比，索马里系统表现出更复杂的季风-海洋相互作用。虽然早期的盆地尺度模拟研究已经确定了北印度洋的一般季节性控制，但我们针对特定区域的观测约束分析揭示了明显的增温和降温阶段之间的不对称性。这些发现强调了季风驱动的、相依赖的海气相互作用在形成西北东热带海温季节性变化中的关键作用。

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引用次数: 0

Phosphorus species in surface sediments of the Kermadec Trench: Distribution and controlling factors 克马德克海沟表层沉积物中磷的种类分布及其控制因素

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2025-12-08 DOI: 10.1016/j.dsr.2025.104639

Zhihao Xiong , Yuanqing Chen , Hengchao Xu , Liang Dong , Zijun Wu

Hadal trenches, as key deep-sea environments for organic matter burial and microbial respiration, are therefore recognized hotspots for early diagenesis. Although phosphorus (P) cycling has been extensively studied in marginal sea sediments, its behavior in hadal trench sediments remains poorly understood. This study examines sedimentary P partitioning in the Kermadec Trench to identify the dominant controls on P speciation. Geochemical data reveal that P distribution is collectively influenced by redox conditions, organic matter content, and volcanic inputs. In the southern part of the trench, higher sedimentary TOC content directly enhances the preservation of iron-bound P (P_Fe, 21 % of total P) and organic P (P_org, 10 %). In contrast, northern sites, which are enriched in volcanic material (Fe_TOT up to 63.2 mg g⁻¹), exhibit lower retention of reactive P (P_rea, 40–45 %), likely due to Fe(III)-mediated dissimilatory iron reduction, along with higher volcanic silicate iron. This spatial heterogeneity exhibits variation influenced by hydrodynamic processes: deep western boundary currents carry terrigenous sediments northward, whereas surface currents distribute volcanic ash southward. Relative to continental shelves, hadal trenches display a greater predominance of detrital P burial (P_detrital, 53 % of total P), as well as elevated proportions of iron-bound P (P_Fe,16 %) and authigenic apatite (P_authi, 20 %). Our findings reveal volcanic activity as a critical control on phosphorus cycling in hadal systems, indicating that these environments are governed by a distinct set of biogeochemical processes.

深海沟作为深海有机质埋藏和微生物呼吸的关键环境，是公认的早期成岩作用热点。尽管磷(P)循环在边缘海沉积物中已被广泛研究，但其在hadal海沟沉积物中的行为仍然知之甚少。本文研究了克马德克海沟沉积磷的分配，以确定磷形成的主要控制因素。地球化学数据表明，磷的分布受氧化还原条件、有机质含量和火山输入的共同影响。在海沟南部，较高的沉积TOC含量直接促进了铁结合磷（PFe，占总磷的21%）和有机磷（Porg, 10%）的保存。相比之下，北部地区富含火山物质（FeTOT高达63.2 mg g−1），表现出较低的活性P保留率（Prea, 40 - 45%），可能是由于Fe（III）介导的异化铁还原，以及较高的火山硅酸盐铁。这种空间异质性表现出受水动力过程影响的变化：深层西部边界流向北携带陆源沉积物，而表层流向南分布火山灰。与陆架相比，海沟中碎屑P的埋藏占比更大（Pdetrital，占总P的53%），铁结合P （PFe, 16%）和自生磷灰石（Pauthi, 20%）的比例更高。我们的研究结果表明，火山活动是hadal系统中磷循环的关键控制因素，表明这些环境是由一套独特的生物地球化学过程控制的。

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引用次数: 0

Antarctic Bottom Water contraction drives abyssal ocean warming along SAMBA-West line (34.5°S) in the Argentine basin 南极底水收缩驱动阿根廷盆地SAMBA-West线（34.5°S）的深海海洋变暖

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2025-12-04 DOI: 10.1016/j.dsr.2025.104627

Daniel M.C. Santos , Tiago C. Biló , Dante C. Napolitano , Renellys C. Perez , Paulo S. Polito , Jonathan Gula , Shenfu Dong , Edmo J.D. Campos , Olga T. Sato

We present an updated assessment of abyssal temperature trends in the Argentine Basin using expanded hydrographic and moored observations from the SAMBA-West line. The study addresses two main questions: (1) What is the spatial distribution of the abyssal warming along the SAMBA-West line? (2) What mechanisms drive the observed changes? Using output from a high-resolution numerical simulation, we first characterize how the abyssal flow near 34.5°S relates to the broader basin-scale circulation, providing context for interpreting the observations. Within this framework, we find that SAMBA-West is situated within a dynamically complex junction of deep boundary currents and recirculation pathways in the northwestern portion of the Argentine Basin. A coherent, statistically significant warming trend is found across most of the array and vertically throughout the AABW layer, primarily due to its vertical contraction, likely reflecting reduced formation or export of the AABW.

我们利用扩展的水文和SAMBA-West线的系泊观测，对阿根廷盆地的深海温度趋势进行了最新评估。该研究解决了两个主要问题：(1)SAMBA-West线深海变暖的空间分布是怎样的？(2)是什么机制驱动了观测到的变化？利用高分辨率数值模拟的输出，我们首先描述了34.5°S附近的深海流动与更广泛的盆地尺度环流的关系，为解释观测结果提供了背景。在此框架内，我们发现SAMBA-West位于阿根廷盆地西北部深部边界流和再循环路径的动态复杂交界处。一个连贯的，统计上显著的变暖趋势贯穿了大部分阵列和垂直贯穿AABW层，主要是由于其垂直收缩，可能反映了AABW的减少形成或输出。

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引用次数: 0

Abyssal macrofaunal community structure in the eastern Clarion-Clipperton Fracture zone 克拉里昂-克利珀顿断裂带东部深海大型动物群落结构

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2025-11-30 DOI: 10.1016/j.dsr.2025.104637

Cheah Hoay Chuar, Samantha Jia Wen Tong, Chee Kong Chim, Helen Pei San Wong, Koh Siang Tan

The abyssal plains of the Clarion-Clipperton Fracture Zone (CCFZ) contain vast amounts of commercially important polymetallic nodules. As deep-sea nodule mining becomes increasingly likely, understanding the spatial distribution of benthic communities and their relationships with environmental variables is critical for developing effective management practices to conserve biodiversity. This study examined macrofaunal communities within the Ocean Mineral Singapore (OMS) contract area located in the easternmost region of the CCFZ. Data collected from 13 box cores during the Resource Cruise 01 (RC01) in 2020 were compared with those from 12 previously analysed box cores sampled during the Abyssal Baseline Project (AB02) in 2015. Sampling sites were between 20 km and 200 km apart. Macrofaunal diversity from RC01 stations was positively correlated with nodule surface cover and sediment shear strength. Higher taxa and family-level analyses revealed varying patterns of clustering depending on the fauna group. Sediment shear strength contributed at least in part to RC01 macrofaunal community variation. When AB02 data were incorporated, significant differences in sediment shear strength and macrofaunal diversity were observed between northern and southern OMS sites. Community composition also differed significantly among sites, with nematodes and copepods primarily driving these differences. Community variation may be attributed to differences in nodule surface cover, albeit in a small proportion. Our findings suggest that sediment shear strength and surface nodule cover are important in shaping benthic community structure. These environmental variables are also most likely to be permanently altered by nodule mining activities. Future studies should incorporate such factors to ascertain their relationship with CCFZ faunal communities. Overall the observed patterns showed that there are considerable biodiversity differences within the OMS contract area. Further studies at higher taxonomical resolution (genus or species level) are needed to determine taxa-specific ecological responses, species connectivity, and dispersal abilities.

克拉里昂-克利珀顿断裂带（CCFZ）的深海平原含有大量具有重要商业价值的多金属结核。随着深海结核采矿的可能性越来越大，了解底栖生物群落的空间分布及其与环境变量的关系对于制定有效的管理措施以保护生物多样性至关重要。本研究调查了位于CCFZ最东部地区的新加坡海洋矿产（OMS）合同区内的大型动物群落。2020年Resource Cruise 01 （RC01）期间收集的13个盒芯数据与2015年Abyssal Baseline Project （AB02）期间收集的12个盒芯数据进行了比较。采样点相距20至200公里。RC01站点的大型动物多样性与结核表面覆盖和沉积物抗剪强度呈正相关。更高的分类群和科水平分析揭示了不同动物群的不同聚类模式。沉积物剪切强度对RC01大型动物群落的变化至少有部分贡献。当AB02数据被纳入时，南北OMS站点的沉积物剪切强度和大型动物多样性存在显著差异。群落组成在不同地点之间也存在显著差异，线虫和桡足类是造成这些差异的主要原因。群落变异可归因于根瘤表面覆盖的差异，尽管比例很小。我们的研究结果表明，沉积物剪切强度和表面结核覆盖在形成底栖生物群落结构中很重要。这些环境变量也很可能被结核采矿活动永久改变。未来的研究应纳入这些因素，以确定它们与CCFZ动物群落的关系。总体而言，观察到的模式表明，OMS合同区域内存在相当大的生物多样性差异。需要在更高的分类学分辨率（属或种）上进一步研究，以确定类群特异性生态响应、物种连通性和扩散能力。

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引用次数: 0

Machine learning reconstruction of multiyear missing nutrient data along the 137°E section, northwestern Pacific 西北太平洋137°E剖面多年缺失营养数据的机器学习重建

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2025-11-30 DOI: 10.1016/j.dsr.2025.104638

Xinling Song , Zhenyan Wang , Yijia Jia , Meihan Zhao , Yujie Fu

Nutrients are fundamental to marine primary production and serve as key tracers of deep-sea circulation. However, continuous in-situ nutrient observations in the open ocean remain challenging. Despite over fifty years of surveys by the Japan Meteorological Agency along the 137°E section in the northwestern Pacific, substantial missing data persist, requiring reconstruction to support future studies on deep nutrient transport in carbon cycling. This study applies three machine learning (ML) methods—Support Vector Regression (SVR), Random Forest (RF), and Extreme Gradient Boosting (XGBoost)—to develop an ML framework for reconstructing summer nutrient data (1997–2022) along this section. The results demonstrate that, compared to baseline models (multiple linear regression, Artificial Neural Networks and Deep Neural Networks), these ML methods achieved a favorable balance between accuracy and stability in predicting nutrients, with RF consistently performing best. Shapley values reveal that RF effectively captures key features like temperature and depth, relies less on weak predictors, and models nonlinear interactions more robustly, which explains its advantage over SVR and XGBoost. RF, selected as the optimal model, was used to reconstruct the three nutrients, capturing characteristic zonal and vertical patterns. Furthermore, compared to the Global Ocean Biogeochemistry Hindcast product, RF achieved a 74–79 % reduction in RMSEs across the three nutrients. This study demonstrates that ML methods (particularly RF) achieve superior accuracy for nutrient reconstruction within the analyzed spatiotemporal scope and may provide a practical framework for nutrient reconstruction in other high-missing-rate marine regions, supporting biogeochemical and deep-sea process studies.

营养物质是海洋初级生产的基础，是深海环流的关键示踪剂。然而，在开阔海域进行连续的原位营养观测仍然具有挑战性。尽管日本气象厅沿着西北太平洋137°E剖面进行了50多年的调查，但大量缺失的数据仍然存在，需要重建以支持未来对碳循环中深层营养物质运输的研究。本研究应用了三种机器学习（ML）方法——支持向量回归（SVR）、随机森林（RF）和极端梯度增强（XGBoost）——来开发一个机器学习框架，用于重建夏季营养数据（1997-2022）。结果表明，与基线模型（多元线性回归、人工神经网络和深度神经网络）相比，这些机器学习方法在预测营养成分的准确性和稳定性之间取得了良好的平衡，其中RF一直表现最好。Shapley值表明，RF有效地捕获了温度和深度等关键特征，对弱预测因子的依赖更少，对非线性相互作用的建模更可靠，这解释了它比SVR和XGBoost的优势。选择RF作为最优模型，利用该模型重构了三种营养成分，并捕获了特征的带状和垂直模式。此外，与全球海洋生物地球化学Hindcast产品相比，RF在三种营养素中的rmse降低了74 - 79%。该研究表明，在分析的时空范围内，ML方法（特别是RF方法）在养分重建方面取得了卓越的准确性，并可能为其他高缺失率海洋区域的养分重建提供实用框架，支持生物地球化学和深海过程研究。

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引用次数: 0

Dissolved iron concentrations in the upper 500 m waters of the eastern Indian ocean 东印度洋500米以上水域的溶解铁浓度

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2025-11-27 DOI: 10.1016/j.dsr.2025.104629

Han Su , Jie Jin , Shuo Jiang , Wei Zheng , Zheng Bo Liu , Yan Chang , Xunchi Zhu , Jing Zhang

Dissolved iron (DFe) in ocean waters often limit phytoplankton growth because of its low bioavailability. In this study, we examined data on the surface and sectional distribution of DFe in the eastern Indian Ocean (EIO) to understand its influence on the surface and upper waters. Our sampling covered the upper 500 m of the EIO between 10°S and 10°N and 78°E−100°E, encompassing the Bay of Bengal (BoB) and the equatorial EIO during the 2017 (March–April) and 2018 (March–May) cruises. In surface waters, DFe concentrations in the Bay of Bengal (0.35 ± 0.06 nmol/kg, n = 20) and at station I507 (the extension of the Indonesian Throughflow, ITF, 0.36 nmol/kg) were higher than those in the equatorial EIO (0.27 ± 0.04 nmol/kg, n = 76). The vertical distribution of DFe exhibited significant spatial differences, with higher concentrations in the BoB than in the equatorial EIO, recorded at 0.79 ± 0.25 nmol/kg and 0.64 ± 0.26 nmol/kg, respectively. The distribution of DFe in the EIO was influenced by three types of water masses and hydrographic features, including the extension of ITF. The relative contributions of different DFe sources, such as river input, dust deposition, and other external sources, varied between the equatorial EIO and BoB as well as between the Indo-Pacific and western Pacific Oceans. Furthermore, the external Fe (Fe∗) and the molar ratios of macronutrients suggest that nitrogen is a more significant limiting factor than Fe in both the BoB and equatorial EIO surface waters. Therefore, our findings contribute to understanding of the distribution patterns and influencing factors of the BoB and the equatorial EIO.

海水中溶解的铁（DFe）由于其低生物利用度而限制了浮游植物的生长。在这项研究中，我们检查了东印度洋（EIO） DFe的表面和剖面分布数据，以了解其对表面和上层水域的影响。在2017年（3月至4月）和2018年（3月至5月）的巡航期间，我们的采样覆盖了10°S至10°N和78°E至100°E之间的EIO上层500米，包括孟加拉湾（BoB）和赤道EIO。在地表水中，孟加拉湾（0.35±0.06 nmol/kg, n = 20）和I507站（印度尼西亚通流延伸，ITF, 0.36 nmol/kg）的DFe浓度高于赤道EIO（0.27±0.04 nmol/kg, n = 76）。DFe的垂直分布存在显著的空间差异，BoB的DFe浓度高于赤道EIO，分别为0.79±0.25 nmol/kg和0.64±0.26 nmol/kg。三种类型的水团和包括ITF扩展在内的水文特征影响了环礁中DFe的分布。不同DFe源（如河流输入、粉尘沉积和其他外部源）的相对贡献在赤道EIO和BoB以及印度洋-太平洋和西太平洋之间存在差异。此外，外部铁（Fe *）和常量营养物质的摩尔比表明，在BoB和赤道EIO地表水中，氮是比铁更重要的限制因素。因此，我们的研究结果有助于理解赤道BoB和赤道EIO的分布格局及其影响因素。

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引用次数: 0

An abnormal Taylor cap observed on the west side of the Beipo seamount in the South China Sea 南海北坡海山西侧异常泰勒帽

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2025-11-20 DOI: 10.1016/j.dsr.2025.104628

Zhengpu Luo , Dezhou Yang , Wuhong Guo , Lingjing Xu , Yuxuan Li , Xiquan Liu , Sheng Dai , Baoshu Yin , Kuidong Xu

An abnormal Taylor cap (ATC) was observed around the Beipo seamount (BPS) in the South China Sea. Unlike previously observed Taylor caps, the ATC is located on the west side of the BPS, rather than at the summit, and deviates by approximately 20 km. Using a high-resolution regional ocean model, we reproduced and investigated the ATC. Numerical experiments revealed that the west deviation and vertical structure of the ATC are controlled by the background flow. A vorticity budget analysis further indicated that the ATC is maintained by a balance between advection and friction. Additionally, both the BPS and ATC contribute to the observed high subsurface chlorophyll concentrations in the region.

在南海北坡海山附近观测到异常的泰勒帽（ATC）。与之前观测到的泰勒帽不同，ATC位于BPS的西侧，而不是峰顶，并且偏离了大约20公里。利用高分辨率区域海洋模型，我们重现并研究了ATC。数值实验表明，ATC向西偏移和垂直结构受背景气流控制。涡度预算分析进一步表明，ATC是由平流和摩擦的平衡维持的。此外，BPS和ATC都对该地区观测到的高地表下叶绿素浓度有贡献。

引用次数: 0

Development of a full-ocean-depth biogeochemistry experiment system and its first application at hadal zone 全海洋深度生物地球化学实验系统的研制及其在深海的首次应用

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2025-11-19 DOI: 10.1016/j.dsr.2025.104626

Shuangquan Liu , Jian Zhang , Mengran Du , Shun Chen , Jiwei Li , Xiaotong Peng

Obtaining actual in situ rate of biogeochemical processes is essential for understanding marine biogeochemical cycles. Automated sampling systems capable of conducting both sampling and incubation under ambient conditions are a powerful approach. Here, we present a full-ocean-depth Biogeochemistry Experiment System (BES), designed for in-situ measurements of ammonium (NH₄⁺) and nitrite (NO₂⁻) oxidation rates in hadal zone (>6000 m). The BES was successfully deployed at four stations in the Yap Trench and the Mariana Trench (Depths: 7869–10903 m), demonstrating its robustness and operational feasibility. NH₄⁺ oxidation rates ranged from undetectable to 0.03 nmol L⁻¹d⁻¹, while NO₂⁻ oxidation rates ranged from 0.64 to 2.29 nmol L⁻¹d⁻¹. These results underscore the utility of BES for deep-sea research and highlight its potential for revealing spatial variability in biogeochemical processes, particularly in regions where depressurization compromises sample integrity.

获得生物地球化学过程的实际原位速率是理解海洋生物地球化学循环的必要条件。能够在环境条件下进行采样和孵育的自动采样系统是一种强大的方法。在这里，我们提出了一个全海洋深度生物地球化学实验系统（BES），设计用于在hadal带（>6000 m）原位测量铵（NH4+）和亚硝酸盐（NO2−）氧化速率。BES已成功部署在雅浦海沟和马里亚纳海沟（深度：7869-10903米）的四个站点，证明了其稳健性和操作可行性。NH4+的氧化速率从检测不到到0.03 nmol L−1d−1，而NO2−的氧化速率从0.64到2.29 nmol L−1d−1。这些结果强调了BES在深海研究中的实用性，并强调了它在揭示生物地球化学过程的空间变异性方面的潜力，特别是在减压损害样品完整性的地区。

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引用次数: 0

The role of geological feature shape on the abundance and diversity of deep sea corals 地质形态对深海珊瑚丰度和多样性的影响

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2025-11-19 DOI: 10.1016/j.dsr.2025.104625

Brian R.C. Kennedy , Randi D. Rotjan

The role of geological gross geomorphology (shape) as an abiotic control governing the abundance and diversity of deep-sea corals has not been previously considered, but has the potential to provide easily-accessible and transformative insight into deep water coral community dynamics. This study aims to investigate the influence of geological shape (e.g. atolls, islands, banks, guyots, conical, ridges) on deep-sea coral genera and habitats in the Pacific Ocean to determine whether feature shape is an important predictor of deep water biological communities. Multivariate analyses were used to test whether the gross geomorphology (shape) of islands and seamounts influences the abundance and diversity of deep water coral genera. Geological features across the entire Pacific basin were categorized using a standard classification scheme to determine their shape category. Across the 50 most abundant deep water coral genera in the data set, all 50 showed a statically significant preference for at least one geomorphology. Additionally, the abundance of the different feature shapes was not evenly distributed across the Pacific basin. Gross geomorphology influences the abundance and diversity of deep-sea corals across the central Pacific, which provides insight into deep water coral community structure and resulting conservation implications.

地质地貌（形状）作为控制深海珊瑚丰富度和多样性的非生物控制的作用以前没有被考虑过，但有可能为深水珊瑚群落动态提供易于获取和变革性的见解。本研究旨在探讨地质形状（如环礁、岛屿、滩、丘、锥形、脊）对太平洋深海珊瑚属和生境的影响，以确定特征形状是否为深水生物群落的重要预测因子。采用多变量分析方法检验了岛屿和海底山的总体地貌（形状）是否影响深水珊瑚属的丰度和多样性。整个太平洋盆地的地质特征使用标准分类方案进行分类，以确定其形状类别。在数据集中50个最丰富的深水珊瑚属中，所有50个都表现出至少一种地貌的静态显著偏好。此外，不同地物形状的丰度在太平洋盆地的分布并不均匀。总体地貌影响着太平洋中部深海珊瑚的丰富度和多样性，这为深入了解深水珊瑚群落结构和由此产生的保护意义提供了依据。

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