Geophysical Research Letters最新文献

Valence/Spin States of Iron in Peridotite Glass to Megabar Pressure Implications for Dense Iron-Rich Silicate Melt at the Bottom of the Mantle

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-04-05 DOI: 10.1029/2024GL113106

Izumi Mashino, Takashi Yoshino, Takaya Mitsui, Kosuke Fujiwara, Sayako Inoué, Takeshi Sakai

引用次数: 0

Decrease in the Permeability of Microcracked and Macrocracked Granite at Elevated Pressure and Temperature

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-04-05 DOI: 10.1029/2024GL112970

L. Carbillet, M. J. Heap, P. Baud, J. I. Farquharson

{"title":"Decrease in the Permeability of Microcracked and Macrocracked Granite at Elevated Pressure and Temperature","authors":"L. Carbillet, M. J. Heap, P. Baud, J. I. Farquharson","doi":"10.1029/2024GL112970","DOIUrl":"https://doi.org/10.1029/2024GL112970","url":null,"abstract":"Pressure and temperature increase with depth, modifying the microstructure of crustal rocks. The opening or closing of micro- and macrocracks resulting from variations in the in-situ conditions influences the permeability of crustal rocks. While confining pressure is known to close pre-existing cracks, reducing permeability, the influence of temperature has received less attention. Here, we measured the permeability of micro- and macrocracked granite at confining pressures and temperatures up to 50 MPa and 150°C, respectively. We find that the permeability of micro- and macrocracked granite decreases with confining pressure. At constant pressure, increasing temperature reduces permeability by up to an order of magnitude, interpreted as the closure of microcracks due to mineral thermal expansion. Using a simplified microstructural model, we show that microcrack aperture is reduced by up to 50% at 150°C compared to room temperature. However, temperature does not appear to influence the permeability of a tortuous macrocrack.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL112970","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778246","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}

引用次数: 0

Boundary Condition for the Electric Field in Earth's Core Models With Conducting Boundaries

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-04-05 DOI: 10.1029/2024GL113585

J. Rekier, S. A. Triana, B. Buffett

引用次数: 0

The Eddy Flux Transport of the Magnetohydrodynamic Quasi-Geostrophic Disturbances

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-04-05 DOI: 10.1029/2025GL115063

Chengkang Li, Yaokun Li

引用次数: 0

Precipitation Estimation With NWP Model and Generative Diffusion Model

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-04-05 DOI: 10.1029/2024GL110625

Haolin Liu, Jimmy C. H. Fung, Alexis K. H. Lau, Zhenning Li

{"title":"Precipitation Estimation With NWP Model and Generative Diffusion Model","authors":"Haolin Liu, Jimmy C. H. Fung, Alexis K. H. Lau, Zhenning Li","doi":"10.1029/2024GL110625","DOIUrl":"https://doi.org/10.1029/2024GL110625","url":null,"abstract":"Recent advancements in state-of-the-art generative deep-learning models, particularly diffusion models, have significantly enhanced the capability to produce realistic and diverse synthetic images and videos. These advancements have had a profound impact on fields such as computer vision and natural language processing. In this study, we leverage this cutting-edge generative model to refine Numerical Weather Prediction (NWP) precipitation outputs. By conditioning the generative model with fundamental meteorological variables simulated by the Weather Research and Forecasting model, we aim to reproduce the high-resolution satellite precipitation product, specifically CMORPH. Benefiting from the superior ability of generative diffusion models to learn the distribution of target data, these models excel in providing detailed and accurate precipitation estimations over the raw NWP outputs and traditional predictive models. With this presented pipeline, we provide valuable insights and practical tools for refining precipitation forecasting while preserving its extremities and variability thus better guiding decision making regarding weather dependent activities.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL110625","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778328","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}

引用次数: 0

Sources and Regional Attributions to Upper Troposphere Nitrogen Oxides During the Asian Summer Monsoon 2022

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-04-05 DOI: 10.1029/2024GL114265

Jun Zhang, Douglas Kinnison, Louisa Emmons, Shawn Honomichl, Warren P. Smith, Simone Tilmes, Xinyue Wang, Alessandro Franchin, Frank Flocke, Laura L. Pan

{"title":"Sources and Regional Attributions to Upper Troposphere Nitrogen Oxides During the Asian Summer Monsoon 2022","authors":"Jun Zhang, Douglas Kinnison, Louisa Emmons, Shawn Honomichl, Warren P. Smith, Simone Tilmes, Xinyue Wang, Alessandro Franchin, Frank Flocke, Laura L. Pan","doi":"10.1029/2024GL114265","DOIUrl":"https://doi.org/10.1029/2024GL114265","url":null,"abstract":"This study investigates the sources and regional attributions of nitrogen oxides (NOx) in the upper troposphere|upper tropospheric (UT) during the Asian Summer Monsoon (ASM). The importance of South Asia (SA) and East Asia (EA) contributions is the subject of main interest. Using artificial tracers in a chemistry-climate model, simulations with tracers from surface anthropogenic and lightning sources in SA and EA are conducted. Model results are validated with airborne observations from the Asian Summer Monsoon Chemical and Climate Impact Project (ACCLIP) campaign in 2022 over the West Pacific. Good agreement between modeled and observed NOx is found in the UT. The results indicate that within the ASM anticyclone, both SA and EA sources significantly contribute to the UT NOx, with contributions of 41% and 36%, respectively. While in the ACCLIP region during 2022, EA sources play a more important role, accounting for 50% compared to 19% from SA sources.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL114265","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778329","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}

引用次数: 0

Estimates of the Global Clear-Sky Longwave Radiative Feedback Strength From Reanalysis Data

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-04-05 DOI: 10.1029/2024GL113495

Helene M. Gloeckner, Lukas Kluft, Hauke Schmidt, Bjorn Stevens

{"title":"Estimates of the Global Clear-Sky Longwave Radiative Feedback Strength From Reanalysis Data","authors":"Helene M. Gloeckner, Lukas Kluft, Hauke Schmidt, Bjorn Stevens","doi":"10.1029/2024GL113495","DOIUrl":"https://doi.org/10.1029/2024GL113495","url":null,"abstract":"We use atmospheric profiles from ERA5, JRA55, and MERRA2 between 1993 and 2023 to estimate Earth's global clear-sky longwave feedback strength on the seasonal and interannual timescale. Differences in the relationship of relative humidity with skin temperature prior to 2008 lead to interannual feedback strengths between 1.34 Wm−2 K−1 (JRA55) and 1.89 Wm−2 K−1 (MERRA2). Restricting the analysis to the last 16 years yields more consistent interannual estimates of 2.05 Wm−2 K−1 on average, which is larger than the overall seasonal estimate of 1.91 Wm−2 K−1. The mid-tropospheric drying causing this difference suggests a substantial influence of ENSO variability on the interannual timescale. This indicates a long-term feedback strength smaller than 2.0 Wm−2 K−1, which is already at the lower end of previous estimates; emphasizing the importance of accurate long-term RH measurements to reliably project Earth's clear-sky feedback strength.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL113495","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778330","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}

引用次数: 0

Climate Control on Erosion: Evolution of Sediment Flux From Mountainous Catchments During a Global Warming Event, PETM, Southern Pyrenees, Spain

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-04-05 DOI: 10.1029/2024GL112404

M. Prieur, C. Robin, J. Braun, R. Vaucher, A. C. Whittaker, R. Jaimes-Gutierrez, A. Wild, J. S. McLeod, L. Malatesta, C. Fillon, F. Schlunegger, T. O. Sømme, S. Castelltort

{"title":"Climate Control on Erosion: Evolution of Sediment Flux From Mountainous Catchments During a Global Warming Event, PETM, Southern Pyrenees, Spain","authors":"M. Prieur, C. Robin, J. Braun, R. Vaucher, A. C. Whittaker, R. Jaimes-Gutierrez, A. Wild, J. S. McLeod, L. Malatesta, C. Fillon, F. Schlunegger, T. O. Sømme, S. Castelltort","doi":"10.1029/2024GL112404","DOIUrl":"https://doi.org/10.1029/2024GL112404","url":null,"abstract":"Extreme hydroclimates impact sediment fluxes from mountainous catchments to the oceans. Given modern global warming, a challenge is to assess the sensitivity of erosion in mountainous catchments to extreme climate perturbations. Here, we reconstruct paleo-sedimentary fluxes across an abrupt global warming, the Paleocene-Eocene Thermal Maximum (PETM, ∼56 Ma), using sedimentary archives and numerical modeling. In the Tremp Basin (Southern Pyrenees, Spain), our results demonstrate that depositional volumetric rates of siliciclastic sediments increased two-fold during the PETM. According to the BQART and stream power law models, changes in mean annual temperature and precipitation explain only 9%–27% of the flux increase. This comparison between field data and model predictions suggests that even with high uncertainty on paleoclimate data, extreme rainfall events and landslides may have been crucial sediment generation processes during the PETM. This is consistent with predictions of enhanced climate variability in a warmer world, leading to significant sediment flushing.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL112404","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778191","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}

引用次数: 0

Predictable Patterns of Seasonal Atmospheric River Variability Over North America During Winter

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-04-05 DOI: 10.1029/2024GL112411

Joseph P. Clark, Nathaniel C. Johnson, Mingyu Park, Miguel Bernardez, Thomas L. Delworth

引用次数: 0

Correlating Groundwater Level Fluctuations of a Fractured Confined Aquifer With Relative Variations in Seismic Velocity: A Way to Estimate the Groundwater Storage

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2025-04-05 DOI: 10.1029/2024GL110808

B. Vittecoq, A. Burtin, J. Fortin

{"title":"Correlating Groundwater Level Fluctuations of a Fractured Confined Aquifer With Relative Variations in Seismic Velocity: A Way to Estimate the Groundwater Storage","authors":"B. Vittecoq, A. Burtin, J. Fortin","doi":"10.1029/2024GL110808","DOIUrl":"https://doi.org/10.1029/2024GL110808","url":null,"abstract":"Analysis of ambient seismic noise is of increasing interest for its potential to monitor aquifers, seismic wave velocity being sensitive to fluctuations of the water table or to pore pressure variations. The correlation with groundwater pressure variations in confined aquifers, which are often strategic, is an open scientific question, as is the stored groundwater volume. Based on an experimental site equipped with a low-cost seismometer located close to a borehole in a confined fractured aquifer, we demonstrate that (a) the auto and inter-components correlation of the time series of the seismometer enables detecting variations in seismic velocities, (b) these changes are negatively correlated with the groundwater pressure variations, and (c) these changes occur above a groundwater pressure threshold related to the fractures' properties. Finally, we propose a method to estimate the storage coefficient's order of magnitude of the confined aquifer using the correlation between dv/v and the groundwater pressure.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 7","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL110808","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778332","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}

引用次数: 0