Sung-Ho Baek, Jung-Hoon Kim, Yoo-Jeong Noh, Sang-Moo Lee, Daehyun Kim, Hye-Yeong Chun
{"title":"Distinct Characteristics of Convectively Induced Turbulence (CIT) and Non-CIT in the Western Pacific Using In Situ Aircraft Data and GK-2A Satellite Data","authors":"Sung-Ho Baek, Jung-Hoon Kim, Yoo-Jeong Noh, Sang-Moo Lee, Daehyun Kim, Hye-Yeong Chun","doi":"10.1029/2026GL125211","DOIUrl":"https://doi.org/10.1029/2026GL125211","url":null,"abstract":"<p>This study introduces a newly defined turbulence patch that includes continuous turbulence reports of in situ aircraft data, separating at least 5-min from others. This enables the individual turbulence patch to be characterized more easily by their possible sources than by an isolated data point. Using 5 years of satellite observations, we classified new turbulence patches into convectively induced turbulence (CIT) and non-CIT. We also classified patches into long- and short-duration events. Patch duration shows clear latitudinal differences, especially for CIT. CIT duration is linked to the size of underlying convective systems and strength of background winds. Signal analysis shows that CIT in low latitude exhibits a high skewness and kurtosis, indicating highly variable turbulence with occasional extreme fluctuations. Meanwhile, long-duration non-CIT patches occur frequently under enhanced Clear-Air-Turbulence (CAT) diagnostics, indicating an association between CAT-prone conditions and encounter duration. These findings support turbulence risk assessment and nowcasting.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"53 20","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026GL125211","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149205999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Offshore Freshened Groundwater Distribution Is Controlled by Along‐ and Cross‐Shore Topographic Variability","authors":"Yi‐Peng Zhang,Anner Paldor","doi":"10.1029/2026gl123775","DOIUrl":"https://doi.org/10.1029/2026gl123775","url":null,"abstract":"Abstract Offshore Freshened Groundwater (OFG) reservoirs are regarded as a potentially significant resource stored in continental shelves. While the role of subsurface geological conditions in controlling OFG has been widely recognized, the influence of the topography of the hosting continental shelf on OFG evolution remains poorly understood. Here, using generalized numerical modeling representative of a broad range of systems worldwide, we evaluate how the shelf slope affects the evolution of OFG in subsea aquifers, considering sea‐level rise over paleohydrogeological timescales. Our findings show that shallow dipping shelves are expected to have greater extents of OFG by up to 2.8 times and enhance the longevity of OFG preservation. Crucially, natural‐scale alongshore slope variability substantially influences the cross‐shore salt distribution. Considering alongshore flow shows that cross‐sectional analyses can overestimate OFG volumes by up to 3 times. These findings highlight the significance of shelf slope and lateral (alongshore) dynamics in estimating and predicting OFG resources.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"17 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Benjamin Laffitte,Zhihan Yang,Tao Zhou,Xiangjun Pei,Xiaolu Tang
{"title":"Interpretable Machine Learning Reveals Global Nonlinear Responses of Soil Respiration to Climate","authors":"Benjamin Laffitte,Zhihan Yang,Tao Zhou,Xiangjun Pei,Xiaolu Tang","doi":"10.1029/2026gl124051","DOIUrl":"https://doi.org/10.1029/2026gl124051","url":null,"abstract":"Abstract Soil respiration ( R s ) is a major component of the global carbon cycle, yet its responses to environmental drivers remain poorly constrained. Using 8,111 observations and a SHAP‐interpreted Random Forest model, we identified global response patterns for key environmental drivers of R s . Temperature contributions showed a peaked association with a descriptive maximum of 27.7°C, precipitation contributions plateaued at high values, and leaf area index contributions increased approximately linearly. These results provide a global, data‐driven characterization of peaked temperature and saturating precipitation associations, including how their shapes and supported ranges vary among climate zones. Our results indicate that monotonic assumptions in Earth system models may overlook important nonlinearities and potentially bias estimates of terrestrial carbon flux responses to seasonal climate extremes. Interpretable machine learning therefore provides a transparent framework for evaluating and improving the representation of soil carbon dynamics under climate change.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Flood Responses to Climate Warming on Tribal Lands Using High-Resolution Hydrodynamic Modeling","authors":"Tianjiao Pu, Gabriele Villarini, Renato S. Amorim, Donghui Li, Sudershan Gangrade, Martha Durr, Brandi Janssen","doi":"10.1029/2026GL124766","DOIUrl":"https://doi.org/10.1029/2026GL124766","url":null,"abstract":"<p>Tribal nations across the United States face disproportionate flood impacts yet remain significantly underrepresented in national-scale assessments, creating a critical equity gap in climate adaptation. We address this deficiency through a climate-to-local-inundation framework for the Santee Sioux Nation, Nebraska, by forcing 10-m hydrodynamic simulations with a 42-year paired historical and pseudo-global-warming CONUS404 runoff event set. Results show that projected changes in inundation frequency and flood depth are limited, with no evidence of widespread intensification of flood extremes. Instead, changes manifest as localized adjustments in floodplain activation and tributary connectivity. Pixel-wise return-period analysis shows small changes in flood depth and only minor deviations in the statistical structure of extremes. These findings demonstrate a transferable pathway for translating climate-driven hydrologic forcing into locally resolved inundation information for under-mapped Tribal lands.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"53 20","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026GL124766","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149206000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhuoyue Zhang,Chenglong Wang,Tianyu Chen,Rui Bao,Zicheng Chen,Xiao Huang,Yang Zhang,Xinqing Zou
{"title":"Sandy Turbidity Current Acts as a Rusty Carbon Pump at the Shelf Edge","authors":"Zhuoyue Zhang,Chenglong Wang,Tianyu Chen,Rui Bao,Zicheng Chen,Xiao Huang,Yang Zhang,Xinqing Zou","doi":"10.1029/2026gl124581","DOIUrl":"https://doi.org/10.1029/2026gl124581","url":null,"abstract":"Abstract Sandy turbidity currents (STCs) efficiently sequester organic carbon (OC) through rapid burial. Yet our understanding of OC preservation within STC deposits remains far less constrained, especially considering STC deposits as an inferred major sink for iron‐bound OC (Fe‐OC), a long‐term stabilized form of OC. Here, we investigate a sediment core with five STC events from the northern slope of the South China Sea (SCS) and compare our observations against a globally compiled sedimentary Fe‐OC data set synthesized from published literature. We demonstrate that STC deposits host a higher Fe‐OC contribution (22.1% ± 7.6%) than background deposits. STCs drive rapid Fe‐OC transportation from shelf to slope under elevated accumulation rates (185.4 ± 84.6 g m −2 time −1 ). This process shields Fe‐OC from remineralization and favors the formation of refractory OC stabilized within iron matrices. We propose that STCs constitute a “rusty carbon pump,” and that continental slopes represent potential hotspots for long‐term Fe‐OC preservation.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"11 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Ammonia Air‐Sea Exchange in Southwest UK","authors":"S. Louw,T. G. Bell,E. M. S. Woodward,M. Yang","doi":"10.1029/2025gl120401","DOIUrl":"https://doi.org/10.1029/2025gl120401","url":null,"abstract":"Abstract Ammonia (NH 3 ) measurements are challenging to make, and air‐sea flux estimates are sparse, with coastal observations complicated by overlapping marine and terrestrial signals. Here we present high‐resolution NH 3 air‐sea flux estimates based on two years (2022–2023) of atmospheric and seawater measurements at the Penlee Point Atmospheric Observatory (PPAO), on the southwest UK coast. NH 3 concentrations peak in spring and summer and were strongly influenced by terrestrial air masses from the UK and Continental Europe. Net NH 3 deposition occurred across all seasons, with seasonal median deposition ranging from 20.5 to 34.5 μmol m −2 d −1 or 1.0 to 1.8 kg NH 3 ‐N ha −1 yr −1 . The flux direction is primarily controlled by atmospheric NH 3 , while seasonal changes in seawater biogeochemistry have a secondary role. These findings highlight the role of anthropogenic NH 3 in coastal nitrogen budgets and underscore the need for high‐resolution flux estimates.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"64 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Montgomery, P. A. Delamere, A. R. Smith, C. Spitler, G. Fuller, R. W. Ebert, F. Allegrini, S. A. Fuselier, R. J. Wilson
{"title":"Exploring Jupiter's Mid-Latitude Dusk Magnetopause: The Impact of Magnetic Reconnection","authors":"J. Montgomery, P. A. Delamere, A. R. Smith, C. Spitler, G. Fuller, R. W. Ebert, F. Allegrini, S. A. Fuselier, R. J. Wilson","doi":"10.1029/2026GL123272","DOIUrl":"https://doi.org/10.1029/2026GL123272","url":null,"abstract":"<p>The Juno mission has elucidated magnetosphere processes, structure, and dynamics via multi-instrument plasma and magnetic field observations. In this study, these instruments are used to identify magnetic reconnection during the Juno extended mission from a survey of 490 magnetopause crossings at the mid-latitude southern dusk magnetopause. This survey spans distances of 30–99 <i>R</i><sub>J</sub>, 14–20 local time, and 30°–65° in southern latitude. We identify reconnection outflow jets, plasma heating, and Hall magnetic fields as reconnection signatures while independently applying the Swisdak and Walén relations to each magnetopause crossing. Additionally, eastward versus westward interplanetary magnetic field (IMF) conditions are compared in this context. The results show that magnetic reconnection is most likely to occur during eastward IMF at the mid-latitude dusk magnetopause due to favorable magnetic shear conditions. The identified eastward IMF reconnection events strongly adhere to the Walén relation, showing signatures of Alfvénic flow perturbations.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"53 20","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026GL123272","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149206001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Sakai,Y. Fukamatsu,V. J. Clementi,Y. Rosenthal,J. Gruetzner,S. Bünz,A. Plaza‐Faverola,K. St. John,R. G. Lucchi,T. A. Ronge,O. Libman‐Roshal,L. Monito,Y. Liu,M. Iizuka,L. Duxbury,L. Haygood,O. Tadai,G.‐I. Uramoto,W. Lin,Expedition 403 Shipboard Scientists
{"title":"Million‐Year Scale Hydrothermal and Hydrocarbon Evolution Hosted Within Stratified Thermohydraulic Systems in Sedimented Ultraslow‐Spreading Settings, Svyatogor and Vestnesa Ridges","authors":"Y. Sakai,Y. Fukamatsu,V. J. Clementi,Y. Rosenthal,J. Gruetzner,S. Bünz,A. Plaza‐Faverola,K. St. John,R. G. Lucchi,T. A. Ronge,O. Libman‐Roshal,L. Monito,Y. Liu,M. Iizuka,L. Duxbury,L. Haygood,O. Tadai,G.‐I. Uramoto,W. Lin,Expedition 403 Shipboard Scientists","doi":"10.1029/2026gl123130","DOIUrl":"https://doi.org/10.1029/2026gl123130","url":null,"abstract":"Abstract Hydrothermal systems at ultraslow‐spreading ridges are poorly understood, especially where thick sediments overlay detachment faults. The International Ocean Discovery Program Expedition 403 obtained the longest sediment record in Atlantic‐Arctic ultraslow‐spreading systems, reaching ∼628 m below the seafloor. Heat‐flow measurements, fluid geochemistry, and mineralogical analyses, combined with seismic interpretation, revealed thermohydraulic systems within two contourite drifts on ridge flanks. The Svyatogor Ridge site exhibits extreme heat flow and crustal‐fluid migration from two detachment faults, accompanied by newly documented thermogenic hydrocarbons, resulting in stratified thermohydraulic systems. The Vestnesa Ridge site exhibits moderate heat flow, and partial crustal‐fluid migration suggests developing thermohydraulic systems. The results reveal complex, long‐lived hydrothermal systems in the present day with significant, previously poorly understood reservoirs of geological carbon and suggest their million‐year‐scale evolution. This study advances understanding of fluid dynamics, fluid‐sediment interactions, and carbon cycling in sedimented ultraslow‐spreading ridge environments.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"478 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Biomass Burning in Australia: No Evidence for Carbonyl Sulfide (OCS) Enhancement in Fire Plumes From In‐Situ Measurements During SouthTRAC","authors":"S. Kessler,N. Emig,H.‐C. Lachnitt,D. Kunkel,H. Bozem,V. Bense,P. Joppe,T. Kaluza,J.‐U. Grooß,A. Zahn,H. Ziereis,M. Riese,P. Hoor","doi":"10.1029/2025gl118750","DOIUrl":"https://doi.org/10.1029/2025gl118750","url":null,"abstract":"Abstract Determining the atmospheric abundance and the emission sources of carbonyl sulfide (OCS) plays a crucial role for the sulfur budget in the atmosphere. In addition to its main anthropogenic and biogenic sources, biomass burning is assumed to be an essential, but not well constrained source of OCS. From November 2019 onward extensive bushfires along the eastern coast of Australia released huge amounts of trace species into the atmosphere; during one flight of the SouthTRAC campaign air masses were observed carrying signatures of these fires along the southern coast of South America. An analysis of the composition of air masses inside and outside the plume revealed distinct differences in the trace species abundances. Specifically, our results indicate that OCS shows no enhancement in its atmospheric mixing ratio due to the Australian fires and thus highlights the varying emission strength of OCS for different types of biomass burning.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"27 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O. Rømcke,P. Gautam,Ø. Breivik,M. P. Malila,R. J. Hearst,S. Å. Ellingsen
{"title":"Direct Experimental Observation of Wave‐Amplified Turbulent Mixing","authors":"O. Rømcke,P. Gautam,Ø. Breivik,M. P. Malila,R. J. Hearst,S. Å. Ellingsen","doi":"10.1029/2026gl124399","DOIUrl":"https://doi.org/10.1029/2026gl124399","url":null,"abstract":"Abstract Langmuir turbulence is a key mechanism to enhanced mixing in the upper ocean. Although often associated with wind, the theoretical framework proposed by Craik and Leibovich requires only vorticity and wave‐induced Stokes drift, regardless of their cause. In a laboratory flume, we make waves of varying steepness interact with a turbulent current to measure the vertical transport of a passive scalar directly. Once waves appear, the turbulent flow changes radically with long, intense Langmuir (like) vortices forming near the surface, aligned with the wave direction. Combining stereo particle‐image velocimetry and laser‐induced fluorescence, we simultaneously measure the turbulent velocity field and the concentration field of a surface‐injected dye, showing dramatic enhancement and deepening of the vertical scalar flux, increasing with wave steepness. The Langmuir enhancement factor for mixing is measured in the range 4–6. The results are consistent with three different variants of the most‐used parameterization of oceanic wave‐induced mixing.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"14 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149209632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}