Journal of Geophysical Research-Oceans最新文献_第7页

An Event-Based Framework Reveals Regionally Distinct Coastal Cold-Water Regimes Along the East Coast of Korea 基于事件的框架揭示了韩国东海岸地区独特的沿海冷水制度

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2026-09-09 DOI: 10.1029/2026JC024312

Deoksu Kim, Jang-Geun Choi, Hojin Kim, Eunjin Kang, Sung-Hwan Park, Jae-Il Kwon

{"title":"An Event-Based Framework Reveals Regionally Distinct Coastal Cold-Water Regimes Along the East Coast of Korea","authors":"Deoksu Kim, Jang-Geun Choi, Hojin Kim, Eunjin Kang, Sung-Hwan Park, Jae-Il Kwon","doi":"10.1029/2026JC024312","DOIUrl":"https://doi.org/10.1029/2026JC024312","url":null,"abstract":"Coastal cold-water events (CWEs) reduce nearshore sea surface temperature (SST) and can cause ecological and socioeconomic impacts; however, objective detection and process-based diagnostics remain limited in marginal seas influenced by western boundary currents. We developed a station-based framework that identifies CWEs by isolating event-scale SST variability after removing diurnal and seasonal signals, and applied it to hourly SST observations from 15 coastal stations along the east coast of Korea during 2004–2023. Spatial coherence revealed three distinct regimes (southern, central, and northern). CWEs in the northern and central regimes occurred earlier in the warm season, intensified more rapidly, and exhibited pronounced cooling-recovery asymmetry, whereas CWEs in the southern regime occurred later, persisted longer, and evolved more gradually. Lagged composites of cross-shore Ekman transport and CWE-targeted SST showed that southern CWE development was consistent with sustained wind forcing, whereas intense cooling in the central and northern regimes occurred despite weaker, shorter wind impulses, implicating oceanic preconditioning. We infer that boundary-current preconditioning sharpens the coastal thermocline, enabling moderate wind to uplift cold subsurface water. Cooling durations matched the theoretical two-layer upwelling timescale in the central and northern regimes but not in the south, where the low Burger number places upwelling under bottom boundary layer control, so cooling is gated by sustained wind. Applying the metric to a global ocean reanalysis revealed state-dependent skill, with systematic warm bias and larger errors during CWEs. The framework provides a transferable basis for CWE diagnostics, event-focused model evaluation, and coastal-hazard prediction.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"131 9","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JC024312","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149205296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Infragravity Waves Across a Steep-Sloping Rough Rocky Seabed on the Inner Shelf 亚重力波穿过内大陆架上陡峭的粗糙岩石海床

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2026-09-09 DOI: 10.1029/2025JC023188

Jamie MacMahan, Falk Feddersen, Ad J. H. M. Reniers, Edward B. Thornton, Olavo B. Marques

{"title":"Infragravity Waves Across a Steep-Sloping Rough Rocky Seabed on the Inner Shelf","authors":"Jamie MacMahan, Falk Feddersen, Ad J. H. M. Reniers, Edward B. Thornton, Olavo B. Marques","doi":"10.1029/2025JC023188","DOIUrl":"https://doi.org/10.1029/2025JC023188","url":null,"abstract":"Observations of infragravity (IG) waves were conducted from June to October 2023 along the rocky shores off China Rock, CA, on the inner shelf at depths of 8–13 m. The study examines inner-shelf IG wave dynamics over rough, steep rocky shores and compares them with those over smoother, gentler sandy shores and coral reefs. IG energy correlated with sea-swell (SS) energy but exhibited a flat spectral distribution across the IG frequency band, showing minimal temporal variations, except during storms. Cross-spectral phase analysis revealed a constant progressive IG wave structure. Theoretical spectral-phase computations based on linear wave dispersion agree well with observations, indicating that IG waves are predominantly free, a finding further supported by a newly derived theoretical relationship showing that the squared correlation coefficient estimates the bound-wave energy fraction. During storms, the IG waves behave increasingly as progressive bound and free waves. These findings contrast with sandy shores, where standing waves typically produce frequency-dependent nodal structures. A cross-shore energy-flux balance indicated that nonlinear energy transfer dominated the IG energy-flux gradient for local generation. Excess energy is balanced by bottom dissipation over the rough seabed, with friction factors larger than, though comparable to, those of coral reef flats. Relative IG-to-SS energy was lower than in other environments, likely due to the absence of reflected and refractively-trapped waves along the extended stretch of rocky shores. Findings suggest that IG waves in this region are locally generated, propagate shoreward as a progressive wave, and are dissipated by the rough, rocky seabed.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"131 9","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JC023188","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tracking Water Masses and Lithogenic Inputs Along the GEOTRACES GI10 Transect in the Arabian Sea With Dissolved Neodymium Concentration and Isotopes 用溶解钕浓度和同位素跟踪阿拉伯海GEOTRACES GI10样带的水团和成岩输入

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2026-09-09 DOI: 10.1029/2026JC024726

Tapas Kumar Mishra, Chhaya Yadav, Sunil Kumar Singh

{"title":"Tracking Water Masses and Lithogenic Inputs Along the GEOTRACES GI10 Transect in the Arabian Sea With Dissolved Neodymium Concentration and Isotopes","authors":"Tapas Kumar Mishra, Chhaya Yadav, Sunil Kumar Singh","doi":"10.1029/2026JC024726","DOIUrl":"https://doi.org/10.1029/2026JC024726","url":null,"abstract":"The distributions of dissolved neodymium concentrations (dNd) and their isotopic compositions (εNd) were investigated along the GEOTRACES India transect (GI10) in the Arabian Sea (AS) during the winter monsoon. In the southeastern AS, low-salinity surface waters are characterized by elevated dNd concentrations (∼18.2–21.9 pmol kg−1) and less radiogenic isotope signatures (εNd ∼ −10.9 to −12.0). This fingerprint reflects the advection of Bay of Bengal (BoB) waters via the East India Coastal Current during the winter monsoon. In contrast, the surface waters of the northern and central AS exhibit more radiogenic εNd values (∼−6.1 to −6.7), capturing the signal of aeolian dust deposited from the surrounding arid regions of the Arabian Peninsula. At intermediate depths, more radiogenic water masses, including Arabian Sea High Salinity Water, Persian Gulf Water, and Red Sea Water (εNd ∼ −6.1 to −7.0), can be tracked advecting from northern to southern AS. Within the core of the intense Oxygen Minimum Zone, a sharp increase in dNd coincides with peaks in dissolved manganese (dMn) and dissolved iron (dFe) at the secondary nitrite maximum, indicating the release of Nd during reductive dissolution of Fe-Mn oxides. The southeastern AS maintains higher dNd and less radiogenic signatures, demonstrating non-conservative behavior driven by the ongoing dissolution of BoB-derived lithogenic material. Conversely, deep waters below 2,000 m in the western, central, and northern AS display a remarkably uniform εNd value of −8.2 ± 0.3, consistent with Circumpolar Deep Water (CDW) and preserving conservative water mass mixing.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"131 9","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Decadal-Scale Bathymetric Change in a Shallow Coastal Bay 浅海沿岸海湾十年尺度的水深变化

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2026-09-09 DOI: 10.1029/2026JC024313

Tyler E. Barnes, Qingguang Zhu, Patricia L. Wiberg

{"title":"Decadal-Scale Bathymetric Change in a Shallow Coastal Bay","authors":"Tyler E. Barnes, Qingguang Zhu, Patricia L. Wiberg","doi":"10.1029/2026JC024313","DOIUrl":"https://doi.org/10.1029/2026JC024313","url":null,"abstract":"Coastal marshes and bays must accumulate sediment to maintain their position relative to mean sea level during periods of sea level rise (SLR). Resuspension of bay-bottom sediment, which together with tidal inundation promotes marsh deposition, is sensitive to water depth, but quantitative measurements of bathymetric change across shallow bays are rare. This study quantified bathymetric change over a 24-year period in a shallow coastal bay lacking fluvial sediment input by repeating a high-resolution survey. On average, shallow tidal flats (0–2 m) deepened 1.9 ± 0.3 cm yr−1, due to a combination of relative SLR and erosion, while a large channel bisecting the bay accreted 6.6 ± 0.7 cm yr−1. The net sediment volume eroded from shallow tidal flats far exceeded that estimated for marshes to keep pace with relative SLR. Month-long model simulations were consistent with observations, reproducing erosion of shallow subtidal flats dominated by storm-wave-driven resuspension and deposition in the channel. Tide-induced resuspension of channel bed sediment during fairweather conditions resulted in net sediment export to the coastal ocean over the simulation period despite import during a northeasterly storm. Modeled sediment fluxes to adjacent marshes based on the two bathymetric surveys were approximately the same despite the increase in depth, consistent with nearly constant rates of marsh accretion in nearby marshes over the same two decades. These findings highlight the value of decadal-scale bathymetric surveys, the potential deepening of shallow coastal bays without large external sediment sources, and the importance of fairweather conditions when sediment budgeting.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"131 9","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JC024313","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unraveling Short-Term Coral Connectivity: The Dominant Influence of Tides on Larval Retention in the Great Barrier Reef 解开短期珊瑚连通性：潮汐对大堡礁幼虫滞留的主要影响

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2026-09-06 DOI: 10.1029/2025JC023633

Katherine C. Lee, Jon Pitchford, Ana Vila-Concejo, Jon Hill

{"title":"Unraveling Short-Term Coral Connectivity: The Dominant Influence of Tides on Larval Retention in the Great Barrier Reef","authors":"Katherine C. Lee, Jon Pitchford, Ana Vila-Concejo, Jon Hill","doi":"10.1029/2025JC023633","DOIUrl":"https://doi.org/10.1029/2025JC023633","url":null,"abstract":"The Great Barrier Reef (GBR) is the world's largest coral reef system, stretching 2,000 km along Australia's north-east continental shelf, where it experiences complex and intricate tidal dynamics. Despite being one of the most studied reef systems, the extent to which local hydrodynamic processes drive local retention, where larvae return to the natal reef they were released from, as a key mechanism underpinning coral connectivity, remains poorly understood. This study examines how tidal dynamics and wind dynamics influence coral connectivity across the GBR, focusing on short-term larval local retention. High-resolution unstructured mesh hydrodynamic modeling (250–20,000 m) was used to drive Lagrangian particle tracking to assess differences between wind driven connectivity, tidally driven connectivity and combined connectivity. Results show that tides, particularly tight, asymmetric, tidal ellipses, play a critical role in driving larval retention, whereas wind disrupts local retention and drives dispersal away from natal reefs. Reef location within the GBR heavily dictates whether tides or wind are the dominant driver of larvae transportation. These findings help quantify the relative contributions of the physical drivers of coral connectivity, with implications for understanding reef resilience, forecasting connectivity and informing management.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"131 9","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bayesian Analysis of Infragravity Edge Waves 次重力边缘波的贝叶斯分析

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2026-09-04 DOI: 10.1029/2026JC024479

Cassandra S. Henderson, R. T. Guza, Bruce D. Cornuelle

{"title":"Bayesian Analysis of Infragravity Edge Waves","authors":"Cassandra S. Henderson, R. T. Guza, Bruce D. Cornuelle","doi":"10.1029/2026JC024479","DOIUrl":"https://doi.org/10.1029/2026JC024479","url":null,"abstract":"Infragravity (IG) waves (periods nominally 25–250 s) are generated in shallow water by nonlinear difference-frequency interactions between shorter period (nominally 4–25 s) incident sea-swell waves. Previous studies show strong IG reflection from the beach face and detectable IG energy in alongshore-propagating edge waves. Here, a linear wave model is developed to invert observed pressure (P) and velocity (cross-shore and alongshore, U, V) cross-spectra (including sensors separated in both the alongshore and cross-shore directions) into cross-shore standing and alongshore progressive linear shallow-water modes. This inversion uses the Bayesian maximum a posteriori method (MAP). Infragravity edge waves on a moderately sloped ocean beach are characterized using 60 days of observations with low-to-moderate energy incident waves. Colocated P and UV sensors were deployed from the shoreline to 30 m depth, with an eight-element PUV array in 7 m depth spanning 1.5 km alongshore. MAP estimates qualitatively agree with previous results obtained using the maximum likelihood estimator and smaller arrays. Edge waves average (28%, 14%, 43%) of the IG (P, U, V) variances in 7 m depth. Edge waves are most energetic at high tide when the shoreline slope is largest, possibly because the steep beach supports the multiple constructively interfering shoreline reflections required to form edge waves. The numerical wave model SWASH 1D assumes normally incident waves and neglects edge waves, but reproduces approximately the energy and cross-shore structure of P and U.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"131 9","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JC024479","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Attribution of the Spread in Antarctic Sea Ice-Driven Water Mass Transformation in Coupled Climate Models 耦合气候模式下南极海冰驱动水团转换扩展的归因

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2026-09-04 DOI: 10.1029/2026JC024388

Zijin Chen, William Hobbs, Zanna Chase, Jan Zika

{"title":"Attribution of the Spread in Antarctic Sea Ice-Driven Water Mass Transformation in Coupled Climate Models","authors":"Zijin Chen, William Hobbs, Zanna Chase, Jan Zika","doi":"10.1029/2026JC024388","DOIUrl":"https://doi.org/10.1029/2026JC024388","url":null,"abstract":"Sea ice plays a critical role in the Southern Ocean freshwater budget and influences water mass transformation (WMT) by redistributing freshwater across density classes. However, the mechanisms driving inter-model spread in this process remain poorly understood. Here, we analyze 18 climate models from the Coupled Model Intercomparison Project Phase 6 to identify the processes controlling sea ice–driven WMT. We show that the inter-model spread is governed by three factors: sea ice production, sea ice spatial redistribution, and ocean density-driven redistribution. Sea ice production is the dominant contributor, as it sets the total freshwater flux available for redistribution. Sea ice spatial redistribution controls how efficiently freshwater is transported across the Southern Ocean and across surface density classes, making it the main pathway through which sea-ice freshwater forcing contributes to cross-isopycnal transformation and ventilation in most models. In contrast, ocean density-driven redistribution, arising from seasonal surface density changes, determines the density classes interacting with freezing and melting and dominates in low-ventilation models. Together, sea ice production sets the freshwater input and the two redistribution processes control its transfer across density classes. Among these, sea ice production shows the strongest correlation with inter-model spread. We further show that differences in sea ice production are closely linked to surface ocean temperature through differences in air–sea heat flux. Overall, sea ice–driven WMT emerges from tightly coupled ocean–atmosphere–sea ice interactions. Reducing model uncertainty therefore requires improved representation of air–sea heat exchange, sea ice thermodynamics, and their coupling with ocean density structure.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"131 9","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JC024388","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Importance and Mechanics of Near-Seafloor Oxygenation Events in Shallow Coastal Environments 浅海环境中近海底氧合事件的重要性和机制

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2026-09-03 DOI: 10.1029/2026JC024176

Jonas P. Fredriksson, Christian Stranne, Inga Monika Koszalka, Jakob Walve, Volker Brüchert

{"title":"The Importance and Mechanics of Near-Seafloor Oxygenation Events in Shallow Coastal Environments","authors":"Jonas P. Fredriksson, Christian Stranne, Inga Monika Koszalka, Jakob Walve, Volker Brüchert","doi":"10.1029/2026JC024176","DOIUrl":"https://doi.org/10.1029/2026JC024176","url":null,"abstract":"Bottom-water oxygen (O2) possibly constitutes the strongest regulating factor on ecosystem function of the seafloor environment. The conventional view of bottom-water O2 regulation in temperate regions is a strong seasonal variability imposed by deposition of fresh, labile organic carbon following the spring and fall plankton bloom generating changing sediment O2 demand. The supply of O2 is considered mainly regulated by seasonally-varying thermal stratification or large-scale lateral advection of water masses. However, benthic O2 also varies over much shorter timescales, but the spatiotemporal regulation of this O2 variability is not well resolved. We conducted a 10-month-long in situ study (2022–2023) of bottom-water O2 dynamics at a 40-m-deep coastal site in the Baltic Sea. Following the spring bloom and the onset of thermal stratification, the gradual decline in O2 was regularly interrupted by rapid (<24 hr) oxygenation events in which O2 levels spiked, subsided, but remained elevated by between 25 and 180 μmol L−1 relative to conditions before the event. Without these events, extrapolation of the observed O2 decline implied hypoxic or anoxic bottom-water conditions by mid-May. Similarly, reoxygenation of the lower water column in the late fall was controlled by a few rapid and strong reoxygenation events. These events are consistent with regional-scale ocean circulation and mixing processes, potentially involving a downwelling mixing front and/or coastal trapped/internal waves. However, we lack data to unambiguously distinguish between these mechanisms. We suggest that rapid benthic oxygenation events are likely a common characteristic of coastal seafloors and critical for benthic ecosystem functioning.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"131 9","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JC024176","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149205359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Processes Impacting the Fate of Small River Plumes Following Storms 风暴后影响小河羽流命运的过程

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2026-09-02 DOI: 10.1029/2026JC024342

Sierra M. Byrne, Sarah N. Giddings, Mark A. Merrifield, Alexander R. Horner-Devine, Matthew S. Spydell, Alexandra J. Simpson, William C. O’Reilly

{"title":"Processes Impacting the Fate of Small River Plumes Following Storms","authors":"Sierra M. Byrne, Sarah N. Giddings, Mark A. Merrifield, Alexander R. Horner-Devine, Matthew S. Spydell, Alexandra J. Simpson, William C. O’Reilly","doi":"10.1029/2026JC024342","DOIUrl":"https://doi.org/10.1029/2026JC024342","url":null,"abstract":"We investigate conditions for small discharge plume formation and transport using observations near a low-inflow estuary in San Diego, CA. We find that the precise timing of discharge and tides influences the source region of small plumes and determines when plume formation occurs. Two plume formation regimes (tidal and river) are identified and distinguished by a non-dimensional parameter. The tidal regime occurs when tides dominate over discharge and plumes only form during ebb tide. The river regime occurs when river discharge dominates and resulting plume formation can persist over one or more full tidal cycles. Small plumes are known to be impacted by surf zone processes at the mouth and here we find that the “surf zone field,” which encompasses the unique dynamics of plumes within the surf zone, impacts the location and timing of plume arrival to the far-field. Three case studies of river regime plumes show that direct wind forcing sets the direction of, and transports, inner-shelf plumes in the far-field. Buoyancy also contributes to plume speed in the far-field during storm conditions. Under moderate winds and waves, the plume spreads predominantly alongshore, however if a storm has weak winds and waves, buoyancy can carry the plume over a large cross-shore extent. The strength and timing of both the wind and wave forcings relative to precipitation, tides, and river discharge can alter transport, highlighting the sensitivity of small discharge plumes to variability in environmental conditions.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"131 9","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JC024342","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anomalous Relationship Between Kuroshio Transport Variability and ENSO During 1993–2020 1993-2020年黑潮输运变率与ENSO的异常关系

IF 3.3 2区地球科学

Journal of Geophysical Research-Oceans Pub Date : 2026-09-01 DOI: 10.1029/2025JC023899

Jiazhen Li, Linlin Zhang, Yuchao Hui, Qinbo Xu, Xuhua Cheng

{"title":"Anomalous Relationship Between Kuroshio Transport Variability and ENSO During 1993–2020","authors":"Jiazhen Li, Linlin Zhang, Yuchao Hui, Qinbo Xu, Xuhua Cheng","doi":"10.1029/2025JC023899","DOIUrl":"https://doi.org/10.1029/2025JC023899","url":null,"abstract":"The origin of the Kuroshio significantly modulates the variations of the Kuroshio system, playing an important role in exchanging water masses, heat, and salt between the low- and mid-latitude Pacific. On the interannual time scale, it is well documented that El Niño and Southern Oscillation (ENSO) is the main factor regulating the origin of the Kuroshio, showing an anticorrelation (i.e., El Niño event relates to a weakened Kuroshio). However, while some studies have reported the decoupled variations between them, in-depth investigations into the underlying mechanisms remain lacking. This study identifies two anomalous states where ENSO variations (leading Kuroshio variations by 10 months) decouple from the origin of the Kuroshio transport anomaly (KTA) variations, thereby elucidating the underlying mechanisms. In state 1 (S1, 1999.5–2002.10), despite an evidently negative ENSO phase, the KTA remains weakly negative (weak Kuroshio). During state 2 (S2, 2005.3–2007.12), ENSO is primarily in positive phase but accompanied by positive KTA. Based on 1.5-layer nonlinear reduced gravity model and spice-heave decomposition, this study suggests that the heaving process caused by mesoscale eddies results in weakly negative KTA in S1. The positive KTA in S2 is ascribed to negative wind stress curl anomalies over the northwestern Pacific (5°N–30°N, 100°E–180°E) approximately 1 year before the S2 period, and to those over the northeastern Pacific (5°N–30°N, 140°W–70°W) approximately 3 years before the S2 period. Such wind changes are likely linked to the influence from the Indian Ocean and a persistent positive ENSO phase (2002–2005), respectively.","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"131 9","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0