Geophysical Research Letters最新文献

{"title":"Mercury's Tidal Love Number \u0000 \u0000 \u0000 \u0000 h\u0000 2\u0000 \u0000 \u0000 ${h}_{2}$\u0000 From Co-Registration of MLA Profiles","authors":"Haifeng Xiao,&nbsp;Alexander Stark,&nbsp;Gregor Steinbrügge,&nbsp;Arthur Briaud,&nbsp;Luisa M. Lara,&nbsp;Pedro J. Gutiérrez","doi":"10.1029/2024GL112266","DOIUrl":"https://doi.org/10.1029/2024GL112266","url":null,"abstract":"<p>Due to its eccentric orbit, Mercury experiences a varying gravitational pull from the Sun along its orbit, leading to periodic surface tidal deformation. The previous measurement of Mercury's tidal <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>h</mi>\u0000 <mn>2</mn>\u0000 </msub>\u0000 </mrow>\u0000 <annotation> ${h}_{2}$</annotation>\u0000 </semantics></math> by Bertone et al. (2021, https://doi.org/10.1029/2020je006683) is based on minimizing height differences at cross-overs of the Mercury Laser Altimeter (MLA) profiles. However, this method can suffer from significant interpolation errors. In this study, we apply an alternative approach, which is based on the co-registration of reprocessed MLA profiles. For the reprocessing, we account for the pointing aberration and incorporate an updated spacecraft orbit model. Within the study region of 77°N to 84°N, we obtain a tidal <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>h</mi>\u0000 <mn>2</mn>\u0000 </msub>\u0000 </mrow>\u0000 <annotation> ${h}_{2}$</annotation>\u0000 </semantics></math> of 0.92<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>±</mo>\u0000 </mrow>\u0000 <annotation> $pm $</annotation>\u0000 </semantics></math>0.58 (3-<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>σ</mi>\u0000 </mrow>\u0000 <annotation> $sigma $</annotation>\u0000 </semantics></math>). This value is compatible with current interior structure and rheology models, but significantly lower than the previous estimate of 1.55<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>±</mo>\u0000 </mrow>\u0000 <annotation> $pm $</annotation>\u0000 </semantics></math>0.65 (3-<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>σ</mi>\u0000 </mrow>\u0000 <annotation> $sigma $</annotation>\u0000 </semantics></math>). When combined with recent tidal <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>k</mi>\u0000 <mn>2</mn>\u0000 </msub>\u0000 </mrow>\u0000 <annotation> ${k}_{2}$</annotation>\u0000 </semantics></math> estimates, our measurement favors a small to medium-sized inner core.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL112266","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749392","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":"Analyses of Virtual Ship-Tracks Systematically Underestimate Aerosol-Cloud Interactions Signals","authors":"Tianle Yuan,&nbsp;Hua Song,&nbsp;Lazaros Oreopoulos,&nbsp;Robert Wood,&nbsp;Kerry Meyer,&nbsp;Alice Crawford,&nbsp;William Smith,&nbsp;Ryan Eastman","doi":"10.1029/2024GL114356","DOIUrl":"https://doi.org/10.1029/2024GL114356","url":null,"abstract":"<p>Ship-tracks are important natural/opportunistic experiments to study aerosol-cloud interactions (ACIs). However, detectable ship-tracks are not produced in many instances. Virtual ship-tracks have been conceived to expand the scale of ACIs analyses. Cloud responses in virtual ship-tracks differ strongly from those of detected ones. Here we show that the current approach of virtual ship-tracks can lead to systematic biases and errors and suggest necessary improvements. Errors in trajectory modeling introduce mismatches between areas actually affected by ship-emissions and virtual ship-track locations, that is, positional errors. Positional errors systematically underestimate ACI signals and the underestimate is severe as indicated by analysis of cloud droplet number concentration changes. The assumption of fixed ship-track width also systematically diminishes resulting aerosol effects by more than 10%, which leads to a forcing difference of around 0.1 <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>W</mi>\u0000 <msup>\u0000 <mi>m</mi>\u0000 <mrow>\u0000 <mo>−</mo>\u0000 <mn>2</mn>\u0000 </mrow>\u0000 </msup>\u0000 </mrow>\u0000 <annotation> $mathrm{W}{mathrm{m}}^{-2}$</annotation>\u0000 </semantics></math>. We make suggestions to improve the simulation of virtual ship-tracks so that their full potential for studying ACIs can be unleashed.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL114356","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749393","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":"Observation-Based Estimate of Net Community Production in Antarctic Sea Ice","authors":"Laura A. Dalman,&nbsp;Klaus M. Meiners,&nbsp;David N. Thomas,&nbsp;Florian Deman,&nbsp;Sophie Bestley,&nbsp;Sébastien Moreau,&nbsp;Kevin R. Arrigo,&nbsp;Karley Campbell,&nbsp;Matthew Corkill,&nbsp;Stefano Cozzi,&nbsp;Bruno Delille,&nbsp;Agneta Fransson,&nbsp;Alexander D. Fraser,&nbsp;Sian F. Henley,&nbsp;Julie Janssens,&nbsp;Delphine Lannuzel,&nbsp;David R. Munro,&nbsp;Daiki Nomura,&nbsp;Louisa Norman,&nbsp;Stathys Papadimitriou,&nbsp;Christina Schallenberg,&nbsp;Jean-Louis Tison,&nbsp;Martin Vancoppenolle,&nbsp;Pier van der Merwe,&nbsp;François Fripiat","doi":"10.1029/2024GL113717","DOIUrl":"https://doi.org/10.1029/2024GL113717","url":null,"abstract":"<p>Antarctic sea ice is one of the largest biomes on Earth providing a critical habitat for ice algae. Measurements of primary production in Antarctic sea ice remain scarce and an observation-based estimate of primary production has not been revisited in over 30 years. We fill this knowledge gap by presenting a newly compiled circumpolar data set of particulate and dissolved organic carbon from 362 ice cores, sampled between 1989 and 2019, to estimate sea-ice net community production using a carbon biomass accumulation approach. Our estimate of 26.8–32.9 Tg C yr⁻¹ accounts for at least 15%–18% of the total primary production in the Antarctic sea-ice zone, less than a previous observation-based estimate (63–70 Tg C yr⁻¹) and consistent with recent modeled estimates. The results underpin the ecological significance of sea-ice algae as an early season resource for pelagic food webs.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL113717","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740967","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":"Simulation and Modeling of Convective Mixing of Carbon Dioxide in Geological Formations","authors":"Marco De Paoli,&nbsp;Francesco Zonta,&nbsp;Lea Enzenberger,&nbsp;Eliza Coliban,&nbsp;Sergio Pirozzoli","doi":"10.1029/2025GL114804","DOIUrl":"https://doi.org/10.1029/2025GL114804","url":null,"abstract":"&lt;p&gt;We perform large-scale numerical simulations of convection in 3D porous media at Rayleigh-Darcy numbers up to &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;R&lt;/mi&gt;\u0000 &lt;mi&gt;a&lt;/mi&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;8&lt;/mn&gt;\u0000 &lt;mo&gt;×&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;msup&gt;\u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;mn&gt;4&lt;/mn&gt;\u0000 &lt;/msup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $Ra=8times 1{0}^{4}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;. To investigate the convective mixing of carbon dioxide (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mtext&gt;CO&lt;/mtext&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${text{CO}}_{2}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;) in geological formations, we consider a semi-infinite domain, where the &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mtext&gt;CO&lt;/mtext&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${text{CO}}_{2}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; concentration is constant at the top and no flux is prescribed at bottom. Convection begins with a diffusion-dominated phase, transitions to convection-driven solute finger growth, and ends with a shutdown stage as fingers reach the bottom boundary and the concentration in the system increases. For &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;R&lt;/mi&gt;\u0000 &lt;mi&gt;a&lt;/mi&gt;\u0000 &lt;mo&gt;≥&lt;/mo&gt;\u0000 &lt;mn&gt;5&lt;/mn&gt;\u0000 &lt;mo&gt;×&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;msup&gt;\u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/msup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $Rage 5times 1{0}^{3}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, we observe a constant-flux regime with dissolution flux stabilizing at 0.019, approximately 13% higher than in 2D estimates. Finally, we provide a simple and yet accurate physical model describing the mass of solute entering the system throughout the whole mixing process. These findings extend solutal convection insights to 3D and high-&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mrow&gt;\u0000 ","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL114804","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740968","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":"Anthropogenic Iodine-129 Traces Complex Inflows of Atlantic and Pacific Waters Into the Western Arctic","authors":"Yuanzhi Qi,&nbsp;Xinru Xu,&nbsp;Qiuyu Yang,&nbsp;Takeyasu Yamagata,&nbsp;Hiroyuki Matsuzaki,&nbsp;Hisao Nagai,&nbsp;Yuichiro Kumamoto","doi":"10.1029/2025GL114687","DOIUrl":"https://doi.org/10.1029/2025GL114687","url":null,"abstract":"<p>Changes in Atlantic and Pacific inflows into the Arctic are contributing to Arctic warming and reshaping water circulation. However, knowledge gaps remain regarding circulation pathways in the western Arctic Ocean, where Arctic Atlantic Water (AAW) and Pacific Water interact. Here, we report iodine-129 (¹²⁹I) concentrations in seawater collected from the western Arctic Ocean and Bering Sea in 2021. The wide range of ¹²⁹I concentrations (1–355 × 10⁷ atoms/L) highlights its value as a tracer for identifying water masses and deciphering circulation patterns. Depth profiles of ¹²⁹I reveal that AAW enters the western Arctic via multiple pathways, with the top layer potentially diverging from the boundary flow and dispersing throughout the region. This previously unreported feature suggests a broader AAW influence on the western Arctic. Additionally, ¹²⁹I concentrations provide direct evidence that the cold halocline effectively limits the upward transfer of matter from AAW to the Arctic surface.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL114687","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143741046","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":"Turbulence Characteristics of Ice-Free Radiatively Driven Convection in a Deep, Unstratified Lake","authors":"Kenneth Larrieu,&nbsp;Oscar Sepúlveda Steiner,&nbsp;Drew M. Friedrichs,&nbsp;Jasmin B. T. McInerney,&nbsp;Jay A. Austin,&nbsp;Alexander L. Forrest","doi":"10.1029/2024GL112607","DOIUrl":"https://doi.org/10.1029/2024GL112607","url":null,"abstract":"<p>This study examines data collected with an autonomous underwater glider during a period of vigorous radiatively driven convection (RDC) and low winds in deep, unstratified Lake Superior. Conductivity, temperature and depth (CTD) measurements reveal distinct convective plumes of warm downwelling water with temperature anomalies of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 <mn>0.1</mn>\u0000 <mo>°</mo>\u0000 </mrow>\u0000 <annotation> ${sim} 0.1{}^{circ}$</annotation>\u0000 </semantics></math>C and width scales on the order of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>10</mn>\u0000 <mo>−</mo>\u0000 <mn>100</mn>\u0000 </mrow>\u0000 <annotation> $10-100$</annotation>\u0000 </semantics></math> m, consistent with theoretical scalings for the unstratified convective regime. Shear and temperature microstructure measurements indicate turbulent kinetic energy (TKE) dissipation <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>(</mo>\u0000 <mi>ε</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <annotation> $(varepsilon )$</annotation>\u0000 </semantics></math> and temperature variance dissipation rates <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mfenced>\u0000 <msub>\u0000 <mi>χ</mi>\u0000 <mi>T</mi>\u0000 </msub>\u0000 </mfenced>\u0000 </mrow>\u0000 <annotation> $left({chi }_{T}right)$</annotation>\u0000 </semantics></math> orders of magnitude greater in thermal plumes than laterally adjacent waters. Decay timescales of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>ε</mi>\u0000 </mrow>\u0000 <annotation> $varepsilon $</annotation>\u0000 </semantics></math> indicate highly efficient mixing is sustained throughout the night. Energetics, mixing efficiency, and constraints on convective plume scales are also discussed. These observations demonstrate that RDC can dominate vertical mixing dynamics even in deep ice-free systems, and these systems can serve as a real-scale laboratory for investigation of convective dynamics.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL112607","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740969","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":"Causes of the Abnormally Strong Easterly Phase of the Mesopause Semiannual Oscillation During the March Equinox of 2023 Revealed by a New Reanalysis Data Covering the Entire Middle Atmosphere","authors":"Kaoru Sato,&nbsp;Dai Koshin,&nbsp;Jose Suclupe,&nbsp;Jorge L. Chau,&nbsp;Lourivaldo M. Lima,&nbsp;Guozhu Li,&nbsp;S. Vijaya Bhaskara Rao,&nbsp;M. Venkat Ratnam,&nbsp;Rodolfo Rodriguez,&nbsp;Danny Scipion","doi":"10.1029/2025GL114658","DOIUrl":"https://doi.org/10.1029/2025GL114658","url":null,"abstract":"<p>During the March equinox of 2023, a strong easterly wind of ∼80 m s⁻¹ appeared at an altitude of ∼82 km in the equatorial upper mesosphere, which is regarded as an enhancement of the mesopause semi-annual oscillation. In this study, a new reanalysis data available up to 110 km was used to investigate its momentum budget. The strong easterly acceleration was due to a similar contribution from resolved waves and parameterized gravity waves, but largely counteracted by an upward advection of westerly momentum. The significant anomaly in the mean winds was not restricted to the 82 km height, but also included strong westerly winds (∼50 m s⁻¹) at 65 km and easterly winds (∼40 m s⁻¹) at 42 km. The stratospheric quasi-biennial oscillation was westerly. The mean wind intensification at each height is explained by the acceleration due to upward propagating waves, which do not suffer from critical filtering below.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL114658","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143741363","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":"Assessing the Duration of the Paleocene-Eocene Thermal Maximum","authors":"Victor A. Piedrahita,&nbsp;David Heslop,&nbsp;Andrew P. Roberts,&nbsp;Eelco J. Rohling,&nbsp;Simone Galeotti,&nbsp;Fabio Florindo,&nbsp;Jinhua Li","doi":"10.1029/2024GL113117","DOIUrl":"10.1029/2024GL113117","url":null,"abstract":"<p>The Paleocene-Eocene Thermal Maximum (PETM) was a climate/carbon cycle perturbation recognized in stable carbon isotope (δ¹³C) records with a negative carbon isotope excursion (CIE). The PETM CIE termination has been associated with a δ¹³C inflection with pre-PETM-like values referred to as the <i>G</i> point. However, the <i>G</i> point approach has produced variable PETM CIE duration estimates (∼120–230 kyr), which reflects a need to test its reliability. Here, we apply statistical analyses to existing δ¹³C records and reveal that the <i>G</i> point is sensitive to underlying δ¹³C uncertainties. We generate a probabilistic-based CIE detection limit, which constrains the time range over which the PETM is detected in δ¹³C records. This protocol reveals a protracted CIE recovery (&gt;145 kyr) that accounts for a 268.8^+21.2/_−20.5 kyr PETM CIE duration. Our new duration estimate exceeds previous values, which confirms the potential of extreme carbon cycle perturbations to cause long-lasting carbon cycle disruptions.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL113117","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745423","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":"Gulf Stream Near Cape Hatteras Modulates Sea Level Variability Along the Southeastern Coast of North America","authors":"Tianning Wu,&nbsp;Ruoying He","doi":"10.1029/2024GL112776","DOIUrl":"https://doi.org/10.1029/2024GL112776","url":null,"abstract":"<p>Studies suggest a strong link between low-frequency sea level variability in the South Atlantic Bight (SAB) and open ocean dynamics. However, the mechanisms driving this connection remain unclear. By analyzing a high-resolution, three-dimensional baroclinic ocean reanalysis, we identify a pathway that links open ocean dynamics to SAB coastal sea level variability through the shelf edge near Cape Hatteras. Gulf Stream meanders in this region induce sea level fluctuations that propagate along the entire SAB shelf. Using an idealized barotropic model, we further demonstrate that topographic waves mediate the propagation of the Gulf Stream signal onto the shelf. Moreover, the Gulf Stream variability is driven by zonal wind stress in the Northwest Atlantic, which is likely modulated by the North Atlantic Oscillation. These findings offer new insights into regional sea level prediction and contribute to broader climate research efforts.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL112776","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740944","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":"Energetic Electron Diffusion and Precipitation Driven by Ducted Hiss Waves in High Density Irregular Region","authors":"Bopu Feng,&nbsp;Haimeng Li,&nbsp;Rongxin Tang,&nbsp;Meng Zhou,&nbsp;Zhihai Ouyang,&nbsp;Zhigang Yuan,&nbsp;Dedong Wang,&nbsp;Xiongdong Yu,&nbsp;Ying Xiong,&nbsp;Zhou Chen,&nbsp;An Yuan,&nbsp;Yingqiao Cheng","doi":"10.1029/2025GL115107","DOIUrl":"https://doi.org/10.1029/2025GL115107","url":null,"abstract":"<p>Plasmaspheric hiss plays an important role in the electron precipitation and the slot formation in radiation belts. Recent studies show the whistler-mode waves can be guided in the density irregularities, performing parallel propagation. Therefore, the resonance between ducted waves and energetic electrons can expand to higher latitudes, and then drive strong energetic electron scattering. In this study, we report a conjugate observation using data from Van Allen Probe A and POES. Through the analysis of observation and the quantification of quasi-linear diffusion coefficients, the results show the ducted hiss can effectively scatter the energetic electrons and drive enhanced electron flux at low altitude region. We suggest the ducted hiss is important for electron loss process in radiation belts.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL115107","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740966","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}