Geophysical Research Letters最新文献

A Marine Barite Perspective of the Late Miocene Biogenic Bloom in the Equatorial Indian Ocean and Equatorial Western Atlantic Ocean 海洋重晶石透视赤道印度洋和赤道西大西洋中新世晚期的生物繁盛期

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-11-19 DOI: 10.1029/2024GL111748

Xinying Wu, Yue Hu, Jingbo Nan, Weiqi Yao

{"title":"A Marine Barite Perspective of the Late Miocene Biogenic Bloom in the Equatorial Indian Ocean and Equatorial Western Atlantic Ocean","authors":"Xinying Wu, Yue Hu, Jingbo Nan, Weiqi Yao","doi":"10.1029/2024GL111748","DOIUrl":"https://doi.org/10.1029/2024GL111748","url":null,"abstract":"The marine biological pump is crucial for removing excess carbon dioxide from the atmosphere to the ocean interior and seafloor sediments. The Late Miocene Biogenic Bloom (LMBB), marked by notable increases in biogenic components in marine sediments, provides insights into the response of the biological pump to climate change. However, understanding the timing, distribution, and cause of the LMBB remains limited. We use marine barite, a refractory mineral precipitating from the water column associated with carbon export, and other proxies to reconstruct productivity in the equatorial Indian Ocean and equatorial western Atlantic between 12 and 5 Ma. Multi-proxy records reveal the onset of the LMBB in the equatorial Indian Ocean at ∼9 Ma, primarily driven by more vigorous upwelling during global cooling. We suggest that the steepened meridional temperature gradient and the Antarctic ice sheet expansion have strengthened ocean overturning, facilitating nutrient supply and biogenic bloom in upwelling regions.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 22","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL111748","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142666123","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

Multi-Scale Thermal Mapping of Submarine Groundwater Discharge in Coastal Ecosystems of a Volcanic Area 火山区沿海生态系统海底地下水排放的多尺度热成像图

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-11-18 DOI: 10.1029/2024GL111857

Ebony L. Williams, Christopher B. Kratt, Raymond S. Rodolfo, Mark R. Lapus, Ryan R. Lardizabal, Aya S. Bangun, Amber T. Nguyen, Scott W. Tyler, M. Bayani Cardenas

{"title":"Multi-Scale Thermal Mapping of Submarine Groundwater Discharge in Coastal Ecosystems of a Volcanic Area","authors":"Ebony L. Williams, Christopher B. Kratt, Raymond S. Rodolfo, Mark R. Lapus, Ryan R. Lardizabal, Aya S. Bangun, Amber T. Nguyen, Scott W. Tyler, M. Bayani Cardenas","doi":"10.1029/2024GL111857","DOIUrl":"https://doi.org/10.1029/2024GL111857","url":null,"abstract":"Submarine groundwater discharge (SGD) in volcanic areas commonly exhibits high temperatures, concentrations of metals and CO2, and acidity, all of which could affect sensitive coastal ecosystems. Identifying and quantifying volcanic SGD is crucial yet challenging because the SGD might be both discrete, through fractured volcanic rock, and diffuse. At a volcanic area in the Philippines, the novel combination of satellite and drone-based thermal infrared remote sensing, ground-based fiber-optic distributed temperature sensing, and in situ thermal profiling in coastal sediment identified the multi-scale nature of SGD and quantified fluxes. We identified SGD across ∼30 km of coastline. The different approaches revealed numerous SGD signals from the intertidal zone to about a hundred meters offshore. In active seepage areas, temperatures peaked at 80°C, and Darcy fluxes were as high as 150 cm/d. SGD is therefore locally prominent and regionally important across the study area.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 22","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL111857","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142666131","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

Lunar Nearside-Farside Mare Basalt Asymmetry: The Combined Role of Global Crustal Thickness Variations and South Pole-Aitken (SPA) Basin-Induced Lithospheric Thickening 月球近侧-远侧玛雷玄武岩不对称：全球地壳厚度变化和南极-艾特肯（SPA）盆地引起的岩石圈增厚的共同作用

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-11-18 DOI: 10.1029/2024GL110510

James W. Head, Xing Wang, Laura H. Lark, Lionel Wilson, Yuqi Qian

{"title":"Lunar Nearside-Farside Mare Basalt Asymmetry: The Combined Role of Global Crustal Thickness Variations and South Pole-Aitken (SPA) Basin-Induced Lithospheric Thickening","authors":"James W. Head, Xing Wang, Laura H. Lark, Lionel Wilson, Yuqi Qian","doi":"10.1029/2024GL110510","DOIUrl":"10.1029/2024GL110510","url":null,"abstract":"Lunar mare basalts represent melting of mantle material, buoyant ascent in dikes, and eruption onto <20% of the surface. Global mare distribution is distinctly asymmetrical, with a paucity on the farside, plausibly interpreted to be related to thicker farside low-density crust inhibiting buoyant magma rise to the surface. Challenging this hypothesis is the presence of the huge, ancient farside South Pole-Aitken (SPA) basin, site of the thinnest crust and deepest depression observed on the Moon. We hypothesize that an oblique impact stripped the farside crust within the SPA basin, permitting early mare basalt emplacement as cryptomaria due to thin/absent crust. However, removal of the SPA thermally insulating megaregolith/crust accelerated lithosphere thickening beneath the basin. This deepening rheological barrier inhibited buoyant rise of mantle diapirs below SPA, resulting in early abatement of mare basalt extrusions compared to the nearside, and retention of the deep, underfilled SPA impact basin observed today.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 22","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL110510","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665333","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

Enhanced Blocking Frequencies in Very-High Resolution Idealized Climate Model Simulations 超高分辨率理想化气候模型模拟中增强的阻塞频率

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-11-18 DOI: 10.1029/2024GL111016

P. De Luca, B. Jiménez-Esteve, L. Degenhardt, S. Schemm, S. Pfahl

{"title":"Enhanced Blocking Frequencies in Very-High Resolution Idealized Climate Model Simulations","authors":"P. De Luca, B. Jiménez-Esteve, L. Degenhardt, S. Schemm, S. Pfahl","doi":"10.1029/2024GL111016","DOIUrl":"https://doi.org/10.1029/2024GL111016","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 Atmospheric blocking is a key dynamical phenomenon in the mid- and high latitudes, able to drive day-to-day weather changes and meteorological extremes such as heatwaves, droughts and cold waves. Current global circulation models struggle to fully capture observed blocking frequencies, likely because of their coarse horizontal resolution. Here we use convection permitting, nested idealized model simulations for quantifying changes in blocking frequency and Rossby wave breaking compared to a coarser resolution reference. We find an increase in blocking frequency poleward and downstream of the area with increased resolution, while the exact regions depend on the blocking index. These changes are probably due to a more accurate representation of small-scale processes such as diabatic heating, which affect Rossby wave breaking and blocking formation downstream. Our results thus suggest an improved representation of blocking in the next generation of high-resolution global climate models.\u0000 </section>\u0000 </div>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 22","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL111016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142666063","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

Survey of Whistler-Mode Wave Amplitudes and Frequency Spectra in Jupiter's Magnetosphere 木星磁层惠斯勒模式波幅和频谱调查

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-11-18 DOI: 10.1029/2024GL111882

Q. Ma, W. Li, X.-J. Zhang, N. Kang, J. Bortnik, M. Qin, X.-C. Shen, C. J. Meyer-Reed, A. V. Artemyev, W. S. Kurth, G. B. Hospodarsky, J. D. Menietti, S. J. Bolton

{"title":"Survey of Whistler-Mode Wave Amplitudes and Frequency Spectra in Jupiter's Magnetosphere","authors":"Q. Ma, W. Li, X.-J. Zhang, N. Kang, J. Bortnik, M. Qin, X.-C. Shen, C. J. Meyer-Reed, A. V. Artemyev, W. S. Kurth, G. B. Hospodarsky, J. D. Menietti, S. J. Bolton","doi":"10.1029/2024GL111882","DOIUrl":"10.1029/2024GL111882","url":null,"abstract":"We present statistical distributions of whistler-mode chorus and hiss waves at frequencies ranging from the local proton gyrofrequency to the equatorial electron gyrofrequency (fce,eq) in Jupiter's magnetosphere based on Juno measurements. The chorus wave power spectral densities usually follow the fce,eq variation with major wave power concentrated in the 0.05fce,eq–fce,eq frequency range. The hiss wave frequencies are less dependent on fce,eq variation than chorus with major power concentrated below 0.05fce,eq, showing a separation from chorus at M < 10. Our survey indicates that chorus waves are mainly observed at 5.5 < M < 13 from the magnetic equator to 20° latitude, consistent with local wave generation near the equator and damping effects. The hiss wave powers extend to 50° latitude, suggesting longer wave propagation paths without attenuation. Our survey also includes the whistler-mode waves at high latitudes which may originate from the Io footprint, auroral hiss, or propagating hiss waves reflected to high M shells.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 22","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL111882","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665334","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

A Critical Core Size for Dynamo Action at the Galilean Satellites 伽利略卫星动力作用的临界核心尺寸

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-11-18 DOI: 10.1029/2024GL110680

K. T. Trinh, C. J. Bierson, J. G. O’Rourke

引用次数: 0

Seasonal Upwelling Forecasts in the California Current System 加利福尼亚洋流系统的季节性上升流预测

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-11-18 DOI: 10.1029/2024GL111083

Dillon J. Amaya, Michael G. Jacox, Michael A. Alexander, Steven J. Bograd, Liwei Jia

引用次数: 0

Possible Causes for the Unprecedented Low/High Tropical Cyclone Activities in the Northern Pacific/Atlantic in 2023 El Niño 2023 年厄尔尼诺现象导致北太平洋/大西洋出现前所未有的低/高热带气旋活动的可能原因

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-11-16 DOI: 10.1029/2024GL111964

Kuan-Chieh Chen, Chi-Cherng Hong, Chi-Chun Chang, Jun Chiang, Sheng-Hsiang Chang

引用次数: 0

Substantial Increase in Sub–Daily Precipitation Extremes of Flooding Season Over China 中国汛期日以下极端降水量大幅增加

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-11-16 DOI: 10.1029/2024GL112182

Yujie Wang, Lianchun Song, Pengke Shen, Yan Yang

{"title":"Substantial Increase in Sub–Daily Precipitation Extremes of Flooding Season Over China","authors":"Yujie Wang, Lianchun Song, Pengke Shen, Yan Yang","doi":"10.1029/2024GL112182","DOIUrl":"10.1029/2024GL112182","url":null,"abstract":"Understanding sub-daily precipitation extremes (SPEs) can provide scientific insights for taking effective measures to mitigate climate risks. Leveraging gauge observations at hourly precipitation in 2,312 meteorological stations and extreme sub-daily precipitation indices (ESPIs), we investigate the changes of SPEs in flooding season of 1971–2022 in China. On country scale, the occurrences and intensity of SPEs have significantly increased and even accelerated since the 21st century, suggesting increases in 2010s by 15%–38% compared with that in 1970s. The SPE risks for 20-year and 50-year return-period increased by 2–4 and 8–20 times in 2001–2022 compared with that in 1971–2000, respectively. Over 80% stations are found to have positive trends in all ESPIs. On regional scale, seven sub-regions experienced significant increases in ESPIs with larger magnitudes in the East China. The enlarged 500-hPa geopotential height, 700-hPa pseudoequivalent potential temperature, 700-hPa specific humidity, saturated vapor pressure and urbanization ratio may be bonded to more SPEs.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 22","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL112182","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142642818","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

Hydroacoustic Observations Reveal Drivers of Mixing and Salinization of a Karst Subterranean Estuary During Intense Precipitation 水声观测揭示强降水期间喀斯特地下河口混合和盐碱化的驱动因素

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-11-16 DOI: 10.1029/2024GL109993

Neil K. Ganju, John W. Pohlman, Steven E. Suttles, David Brankovits

{"title":"Hydroacoustic Observations Reveal Drivers of Mixing and Salinization of a Karst Subterranean Estuary During Intense Precipitation","authors":"Neil K. Ganju, John W. Pohlman, Steven E. Suttles, David Brankovits","doi":"10.1029/2024GL109993","DOIUrl":"10.1029/2024GL109993","url":null,"abstract":"Karst subterranean estuaries within globally ubiquitous carbonate aquifers are coastal groundwater ecosystems that provide an essential water resource for human populations. To understand the drivers of salinization within a coastal aquifer in the Yucatan Peninsula (Mexico), we employed hydroacoustics in flooded caves to observe how oceanic and atmospheric events facilitate mixing between the meteoric lens (fresh-brackish groundwater) and the saline groundwater on tidal and episodic timescales. Precipitation during Tropical Storm Carlotta increased the flow and salinity of the meteoric lens without evidence for vertical mixing across the halocline. We postulate that vertical migration of haloclines in the conduit relative to those within the rock matrix during precipitation creates lateral density gradients that drive mixing, and ultimately creates a brackish layer within the meteoric lens. These results provide a mechanistic explanation for vertical and lateral exchange in a coastal carbonate aquifer, which has implications for groundwater response to future climatic change.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 22","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL109993","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142642817","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