Deep-Sea Research Part I-Oceanographic Research Papers最新文献_第2页

Suppressed vertical propagation of near-inertial waves by consecutive tropical cyclones in the northern South China Sea 南海北部连续热带气旋对近惯性波垂直传播的抑制

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2026-04-01 Epub Date: 2026-01-30 DOI: 10.1016/j.dsr.2026.104666

Wulinan Guo , Jiexin Xu , Yankun Gong , Zifei Chen , Zhiwu Chen , Yinghui He , Shuqun Cai

Mooring data near the Yitong Shoal in the South China Sea during July 2024 were used to analysis near-inertial waves (NIWs) induced by three consecutive tropical cyclones (TCs, hereafter TC1, TC2 and TC3). All three TCs generated marked energy increases in near-inertial band. Though induced by similar wind stress, NIWs from TC1 resembled those reported in previous studies, whereas TC2 and TC3 exhibited distinct characteristics. Compared with TC1, the propagation depth of NIWs induced by TC2 reduced by 15.56% whilst the maximum NIW velocity increased by 30%, and the propagation depth of NIWs by TC3 reduced by 33.33% whilst the maximum NIW velocity increased by 60%, indicating amplified yet suppressed vertical propagation NIWs. Directional decomposition and rotary spectra indicated that NIWs were downward-propagating from the surface, suggesting that they were mainly generated by TCs. Wind work analysis showed increased energy transfer into the mixed layer during consecutive TCs. They are also influenced by near-inertial currents induced by preceding TCs. During consecutive TCs period, oceanic stratification changed significantly, keeping weaken between 40 and 70 m but strengthen between 70 and 150 m, resulting in a reduction of NIW vertical wavelengths and group velocities, indicating a suppressed vertical propagation of NIWs. Enhanced shear and low Ri appeared where oceanic stratification was strengthened, suggesting an enhanced mixing. Consequently, near-inertial kinetic energy generated by TC3 dissipated largely in the shallowest depth. These results provide new insights into how consecutive extreme TCs modulate NIWs and upper-ocean mixing, highlighting the differences between consecutive TCs and single TC in induced NIWs.

利用2024年7月南海伊通浅滩附近的系泊资料，对连续三个热带气旋（以下简称TC1、TC2和TC3）诱发的近惯性波进行了分析。三种tc均在近惯性波段产生显著的能量增加。虽然由相似的风应力诱导，但TC1的NIWs与先前研究报告的NIWs相似，而TC2和TC3表现出不同的特征。与TC1相比，TC2诱导的NIWs传播深度减小了15.56%，最大NIW速度增加了30%；TC3诱导的NIWs传播深度减小了33.33%，最大NIW速度增加了60%，表明NIWs的垂直传播受到了放大和抑制。定向分解和旋转光谱表明，NIWs从地表向下传播，表明NIWs主要由tc产生。风功分析表明，连续的tc增加了向混合层的能量传递。它们也受到由前面的tc引起的近惯性电流的影响。在连续tc期间，海洋分层变化明显，在40 ~ 70 m之间保持减弱，在70 ~ 150 m之间增强，导致NIW垂直波长和群速度减少，表明NIW垂直传播受到抑制。在海洋分层增强的地方出现剪切增强和低Ri，表明混合增强。因此，TC3产生的近惯性动能在最浅的深度大量耗散。这些结果为了解连续极端TC如何调节NIWs和上层海洋混合提供了新的见解，突出了连续TC和单一TC在诱导NIWs中的差异。

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引用次数: 0

Horizontal evolution characteristics of near-inertial sea surface currents induced by the tropical cyclones in the Guangdong-Hong Kong-Macao Greater Bay area 粤港澳大湾区热带气旋诱发的近惯性海流水平演化特征

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2026-04-01 Epub Date: 2026-01-28 DOI: 10.1016/j.dsr.2026.104665

Lei Ren , Hexu Wang , Beinuo Zhou , Xiaofan Lou , Zhenglin Li , Long Bai , Fan Yang , Zhenchang Zhu , Fearghal O'Donncha , Jun Wei , Michael Hartnet

Near-inertial currents driven by barotropic wind forcing are pivotal in upper-ocean mixing and transport. This study investigates the horizontal structure and energy distribution of Near-Inertial Surface Currents (NISCs) in the South China Sea using High-Frequency Radar (HFR) measurements, compensating for the lack of large-scale continuous observations, particularly under tropical cyclone (TC) conditions. Wavelet and power spectral analyses reveal that NISCs, while secondary to tides under normal conditions, become the dominant mode of motion during intense TCs like Choi-wan. The currents organize into a cyclonic circulation with a 1–2 day period, exhibiting significant east-west coherence and enhanced velocities during TCs. Energy analysis confirms that the near-inertial wind stress is the primary forcing mechanism, with TC passages driving substantial energy accumulation and nonlinear tidal-inertial interactions leading to frequency shifts and dissipation. These findings underscore the critical role of wind forcing, especially during extreme weather, in generating and modulating NISCs.

由正压风强迫驱动的近惯性流是上层海洋混合和运输的关键。本文利用高频雷达（HFR）测量资料，研究了南海近惯性表面流（NISCs）的水平结构和能量分布，弥补了热带气旋（TC）条件下大尺度连续观测的不足。小波和功率谱分析表明，在正常情况下，NISCs次于潮汐，而在像Choi-wan这样的强烈tc期间，NISCs成为主要的运动模式。这些气流组织成一个周期为1-2天的气旋环流，在tc期间表现出明显的东西相干性和速度增强。能量分析证实，近惯性风应力是主要的强迫机制，TC通道驱动大量能量积累，非线性潮汐-惯性相互作用导致频移和耗散。这些发现强调了风的强迫作用，特别是在极端天气下，在产生和调节NISCs中的关键作用。

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引用次数: 0

Characterization and stabilization pathways of water-extractable dissolved organic matter in the Mariana Trench sediments 马里亚纳海沟沉积物中可水萃取溶解有机质的表征及其稳定途径

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2026-04-01 Epub Date: 2026-02-04 DOI: 10.1016/j.dsr.2026.104667

Jiayue Geng , Min Luo , Kexin Zheng , Linying Chen , Tingcang Hu , Dong Zhang , Jingqian Xie , Duofu Chen

Hadal trenches have been taken as hotspots for organic carbon burial and microbial activity in the deep-sea settings. In this study, water-extractable (WEOM) and porewater dissolved organic matter (PWOM) were analyzed from two sites in the Mariana Trench—MT04 (clay-dominated) and MT05 (laminated diatom mat, LDM sediments)—to evaluate the influence of mineral association on dissolved organic matter composition, optical characteristics, and stable carbon isotopic signatures. Compared to the LDM core, WEOM in the clay-dominated core shows higher SUVA₂₅₄, humification index (HIX), and A₂₅₃/A₂₀₃ values, but the fluorescence index (FI) is lower. These optical characteristics indicate higher aromaticity, a greater degree of humification and lower bioavailability of WEOM. Such patterns suggest that clay minerals selectively adsorb and occlude aromatic- and carboxyl-rich dissolved organic matter. This mineral association reduces microbial accessibility and enhances long-term preservation. Comparison between WEOM and PWOM further reveals distinct compositional and functional differences within the sedimentary organic carbon pool. WEOM is tightly associated with mineral surfaces, enriched in aromatic and humified components, and exhibits stronger stability, whereas PWOM contains more protein-like and labile constituents. The decreasing trend in δ¹³C (δ¹³C of sediment total organic carbon > δ¹³C of WEOM > δ¹³C of PWOM) indicates that selective microbial degradation and mineral protection jointly regulate dissolved organic matter transformation pathways. Therefore, WEOM represents a mineral-associated, relatively stable carbon reservoir that plays a crucial role in long-term organic carbon preservation in the deep-sea environment.

深海沟被认为是深海环境中有机碳埋藏和微生物活动的热点。本文分析了马里亚纳海沟mt04（粘土为主）和MT05（层状硅藻垫，LDM沉积物）两个地点的水可萃取（WEOM）和孔隙水溶解有机质（pom），以评价矿物组合对溶解有机质组成、光学特征和稳定碳同位素特征的影响。与LDM岩心相比，粘土占主导的岩心中WEOM的SUVA254、腐殖化指数（HIX）和A253/A203值较高，但荧光指数（FI）较低。这些光学特征表明WEOM具有较高的芳香性、较大的腐殖化程度和较低的生物利用度。这种模式表明粘土矿物选择性地吸附和封闭富含芳香和羧基的溶解有机质。这种矿物结合减少了微生物的可及性，增强了长期保存。WEOM与pom的对比进一步揭示了沉积有机碳库中明显的成分和功能差异。WEOM与矿物表面紧密结合，富含芳香和腐殖化成分，具有较强的稳定性，而wom含有更多的蛋白质样和不稳定成分。δ13C（沉积物总有机碳δ13C >； WEOM δ13C > wom δ13C）呈下降趋势，表明微生物选择性降解和矿物保护共同调节了溶解有机质转化途径。因此，WEOM代表了一种与矿物相关的、相对稳定的碳储层，对深海环境中有机碳的长期保存起着至关重要的作用。

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引用次数: 0

Seasonal variability of Eddy Kinetic Energy in the Brazil current, South Brazil Bight 南巴西湾巴西海流涡旋动能的季节变化

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2026-02-01 Epub Date: 2025-12-29 DOI: 10.1016/j.dsr.2025.104645

Lucas da Silva Salimene, José Luiz Lima de Azevedo, Leopoldo Rota de Oliveira, André Lopes Brum

The seasonal variability of Eddy Kinetic Energy (EKE) in the Brazil Current (BC) within the South Brazil Bight (22°S–28°S) remains poorly understood, particularly the role of energy conversion and redistribution terms. Using fourteen years of output from an eddy-resolving numerical simulation, we perform the first seasonal analysis of the EKE budget in this region. We find a pronounced along-stream asymmetry in the EKE seasonal cycle: upstream EKE peaks in summer, while downstream it peaks in winter. The barotropic instability is the primary modulator of EKE within the offshore flank of the mean BC jet. In contrast, baroclinic instability processes dominate beneath the jet core, as indicated by vertical eddy density fluxes. A key finding is that the advection of EKE exhibits the strongest correlation with EKE variability, identifying it as the principal mechanism for redistributing energy from generation sites. While eddy wind work shows no direct influence, pressure work peaks in the region of the Intermediate Western Boundary Current (IWBC), suggesting a potential energy pathway between the BC and the IWBC. Our results establish that the seasonal EKE cycle is not driven by local generation alone but is fundamentally controlled by the advective redistribution of energy from regions of high mesoscale activity.

南巴西湾（22°S - 28°S）内巴西海流（BC）涡旋动能（EKE）的季节变化仍然知之甚少，特别是能量转换和再分配条款的作用。利用14年的涡解析数值模拟输出，我们对该地区的EKE预算进行了第一次季节性分析。我们发现EKE季节循环具有明显的沿流不对称性：上游EKE在夏季达到峰值，而下游EKE在冬季达到峰值。正压不稳定性是平均BC急流近海侧翼内EKE的主要调制器。相反，斜压不稳定过程在喷流核心下方占主导地位，垂直涡密度通量表明了这一点。一个关键的发现是，EKE平流与EKE变异性表现出最强的相关性，这表明它是发电场所能量再分配的主要机制。涡旋风功没有直接影响，而压力功在中西边界流（IWBC）区域达到峰值，表明中西边界流与中西边界流之间存在势能通道。我们的研究结果表明，季节性的EKE周期并非仅由本地发电驱动，而是从根本上由来自高中尺度活动区域的能量平流再分配控制。

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引用次数: 0

Response of deep-sea cold seep sediments to methane gas migration: Influence on sediment microstructure 深海冷渗沉积物对甲烷气体运移的响应：对沉积物微观结构的影响

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2026-02-01 Epub Date: 2025-11-12 DOI: 10.1016/j.dsr.2025.104621

Yue Zhang , Jing-chun Feng , Bin Wang , Hui Zhang , Yuhang Zhang , Zhifeng Yang , Si Zhang

In deep-sea cold seep sediments, the modification of the microstructure of sediments by methane (CH₄) gas migration will directly affect sediment stability, the accumulation of hydrates, and the ecological and geological environment of the seafloor. Although the decomposition of hydrates caused by geological activities in deep-sea cold seeps lead to CH₄ release, it is still unclear how the migration behavior resulting from the release of CH₄ gas in cold seep areas alters the microstructure of sediments. In this study, we investigated the microstructural evolution of cold seep sediments during CH₄ migration, combined with X-ray computed tomography (X-CT). Here, we set up experimental conditions with different gas flow rates and different sediment particle sizes to study the influence of CH₄ migration on the microstructure modification of sediments, and to analyze its impact on hydrate accumulation and the ecological and geological environment of the seafloor. The changes in the distribution of particle theta (θ) and phi (φ) values indicated that the orientation distribution of coarse and medium sand particles tends to be isotropic. Compared to the initial state, the high gas flow rate caused bubble expansion, resulting in a slight increase of 2–5 % in local porosity. In addition, the migration channel selectivity of CH₄ was higher in coarse and medium sand sediments, while the low connectivity of fine sand sediments limits the migration of CH₄. While the tiny bubbles remaining in the pores of fine sand sediments can enhance the mass transfer and transformation of CH₄.

在深海冷渗沉积物中，甲烷（CH4）气体运移对沉积物微观结构的改变将直接影响沉积物的稳定性、水合物的富集以及海底的生态地质环境。虽然深海冷渗漏区地质活动导致水合物分解导致CH4释放，但冷渗漏区CH4气体释放导致的迁移行为如何改变沉积物微观结构尚不清楚。在这项研究中，我们结合x射线计算机断层扫描（X-CT）研究了CH4迁移过程中冷渗沉积物的微观结构演变。本研究通过设置不同气体流速和不同沉积物粒径的实验条件，研究CH4迁移对沉积物微观结构改性的影响，并分析其对水合物聚集和海底生态地质环境的影响。颗粒θ (θ)和φ (φ)值分布的变化表明，粗粒和中粒的取向分布趋于各向同性。与初始状态相比，高气体流速导致气泡膨胀，导致局部孔隙度略微增加2 - 5%。此外，CH4在粗、中沙质沉积物中运移通道选择性较高，而细沙质沉积物的低连通性限制了CH4的运移。而细砂沉积物孔隙中残留的微小气泡则能促进CH4的传质转化。

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引用次数: 0

Carbon cycle system and origin of organic molecules in subseafloor serpentinized rocks of the Atlantis Massif (Mid-Atlantic ridge, 30°N) oceanic core complex 亚特兰提斯地块（大西洋中脊，30°N）洋核杂岩海底蛇纹岩碳循环系统及有机分子成因

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2026-02-01 Epub Date: 2025-12-23 DOI: 10.1016/j.dsr.2025.104643

Amila Sandaruwan Ratnayake , Yoshikazu Sampei , Minoru Ikehara , David Lawrence Dettman

The Atlantis Massif (Mid-Atlantic Ridge, 30°N) provides a natural laboratory in the deep ocean for understanding the links among the hydrothermal system, serpentinization, abiogenic organic synthesis, and microbial activity in mantle-derived rocks. This study examined the potential origin of organic compounds in the subsurface geosphere. Subsurface rocks were recovered using seabed drilling during the International Ocean Discovery Program (IODP) Expedition 357 “Atlantis Massif Serpentinization and Life”. These samples include a range of lithologies such as dunite, gabbro, basalt, serpentinite, serpentinized dunite, and carbonate. Bulk and molecular organic geochemical parameters were evaluated for thirty-nine rock samples. Total organic carbon (TOC) values range from 0.010 % to 0.174 % (average = 0.058 % ± 0.04). Bulk δ¹³C_total and δ¹³C_TOC values range from −24.6 ‰ to 5.6 ‰ (average = −14.3 ‰ ± 7.2) and from −28.4 ‰ to −26.3 ‰ (average = −27.7 ‰ ± 0.5), respectively. Bulk chemical composition, organic molecular composition, and stable isotope data (including compound-specific) show systematic changes for different lithologies at the Atlantis Massif. δ¹³C values of long-chain n-alkanes (C₂₀ to C₃₅) are higher in minerals of the rocks (average = −17.2 ‰ ± 2.1), indicating the traces of abiotic processes such as Fischer–Tropsch type synthesis. Sterane and hopane biomarkers suggest the occurrence of successive biotic processes in the Atlantis Massif. The low δ¹³C values of esters (i.e., fatty acid methyl ester after the esterification), phenol and alcohol molecules, and the approximate correlation between TOC and total sulfur (TS) contents may indicate a contribution of bacteria. The inverse isotopic trend could result from abiotic processes such as Fischer–Tropsch type synthesis during serpentinization with overprinting by biotic organic matter. Therefore, the submarine hydrothermal systems of the Atlantis Massif show a systematic process of abiotic hydrocarbon formation and their use by bacterial activity.

亚特兰提斯地块（大西洋中脊，30°N）为了解幔源岩中热液系统、蛇纹石作用、非生物有机合成和微生物活动之间的联系提供了一个天然的深海实验室。本研究考察了地下地圈中有机化合物的潜在来源。在国际海洋发现计划（IODP）第357次远征“亚特兰蒂斯地块蛇纹石化和生命”期间，使用海底钻井回收了地下岩石。这些样品包括一系列岩性，如白云岩、辉长岩、玄武岩、蛇纹岩、蛇纹岩化的白云岩和碳酸盐。对39个岩石样品的体积和分子有机地球化学参数进行了评价。总有机碳（TOC）值范围为0.010% ~ 0.174%（平均值= 0.058%±0.04）。δ13Ctotal和δ13CTOC的变化范围分别为- 24.6‰~ 5.6‰（平均= - 14.3‰±7.2）和- 28.4‰~ - 26.3‰（平均= - 27.7‰±0.5）。总体化学组成、有机分子组成和稳定同位素数据（包括化合物特异性）显示了亚特兰提斯地块不同岩性的系统变化。岩石矿物中长链正构烷烃（C20 ~ C35）的δ13C值较高（平均= - 17.2‰±2.1），显示出费托合成等非生物过程的痕迹。甾烷和藿烷生物标志物表明亚特兰蒂斯地块发生了连续的生物过程。酯类（即酯化后的脂肪酸甲酯）、苯酚和醇分子的δ13C值较低，TOC与总硫（TS）含量呈近似相关性，可能是细菌的贡献。逆同位素趋势可能是由生物有机质叠印蛇纹石过程中的费托合成等非生物过程引起的。因此，亚特兰提斯地块海底热液系统显示了一个系统的非生物烃形成和细菌活动利用的过程。

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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 : 2026-02-01 Epub 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

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 : 2026-02-01 Epub 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

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 : 2026-02-01 Epub 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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引用次数: 0

Tracking blind journey in the deep-sea: origin and evolutionary history of the Typhlotanaidae (Crustacea: Tanaidacea) 深海盲行追踪：斑藻科的起源与进化史（甲壳纲：斑藻科）

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Deep-Sea Research Part I-Oceanographic Research Papers

Pub Date : 2026-02-01 Epub Date: 2025-10-24 DOI: 10.1016/j.dsr.2025.104608

Marta Gellert , Magdalena Błażewicz , Tomasz Mamos , Graham J. Bird

The Typhlotanaidae are regarded as one of the most diverse families within the suborder Tanaidomorpha; their actual diversity and evolutionary history remain poorly understood. To elucidate the evolutionary history within this group, we analysed three molecular markers, i.e., the mitochondrial cytochrome oxidase I (COI), the nuclear 18S rRNA, and histone 3 (H3) gene. This represents the first phylogenetic investigation of the family Typhlotanaidae and, more broadly, the first molecular attempt to reconstruct evolutionary relationships within the suborder Tanaidomorpha. The phylogenetic reconstruction revealed the polyphyletic nature of the Typhlotanaidae, leading to elevation of two genera to family rank. Furthermore, by applying an integrative approach that combined molecular and morphological evidence, three new typhlotanaid subfamilies were defined, one subfamily was re-established, and two new genera were erected. As a result of this study, the number of species included in the Typhlotanaidae has considerably reduced, with the family now comprising 119 valid species.

斑蝶科被认为是斑蝶亚目中最多样化的科之一；它们的实际多样性和进化历史仍然知之甚少。为了阐明这一群体的进化历史，我们分析了三个分子标记，即线粒体细胞色素氧化酶I (COI)，核18S rRNA和组蛋白3 （H3）基因。这代表了斑竹科的第一次系统发育研究，更广泛地说，是重建斑竹亚目进化关系的第一次分子尝试。系统发育的重建揭示了蝗科的多系性，导致两个属的科级上升。在此基础上，采用分子和形态证据相结合的综合方法，确定了3个新的斑虱亚科，重建了1个亚科，建立了2个新属。这项研究的结果是，蝗科的物种数量大大减少，目前该科包括119种有效物种。

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引用次数: 0