Geophysical Research Letters最新文献_第10页

Clustering the Diurnal Cycle of Precipitation Using Global Satellite Data

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-12-04 DOI: 10.1029/2024GL111513

Penghan Chen, Aifang Chen, Shuiqing Yin, Yuxin Li, Junguo Liu

{"title":"Clustering the Diurnal Cycle of Precipitation Using Global Satellite Data","authors":"Penghan Chen, Aifang Chen, Shuiqing Yin, Yuxin Li, Junguo Liu","doi":"10.1029/2024GL111513","DOIUrl":"10.1029/2024GL111513","url":null,"abstract":"The diurnal cycle of precipitation (DCP) is a fundamental component of the precipitation cycles across various temporal scales. However, the absence of a comprehensive and intuitive clustering description of the DCP, including precipitation amount, frequency, intensity, and seasonality on the global scale, has impeded understanding of climate impacts on society. This study investigates the diurnal cycle and its seasonal differences in global precipitation using hierarchical clustering and high-resolution satellite precipitation data. Results indicate that regions with coastal and topographic complexity exhibit intricate clustering patterns globally. Significant inter-cluster differences suggest that the precipitation amount and frequency have stronger diurnal cycles than that of the precipitation intensity. Seasonal cluster transitions indicate that the global DCP exhibits significant seasonal differences. This study provides multiple sets of information-rich and user-friendly maps of the DCP, enhancing research on sub-daily precipitation mechanisms and their climatic impacts.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 23","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL111513","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142763084","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

No Temporal Change Seen in High-Frequency Waves Scattered Near the Core-Mantle Boundary

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-12-04 DOI: 10.1029/2024GL112155

Ruoyan Wang, John E. Vidale, Wei Wang

引用次数: 0

Persistent Heterogeneities in the Oceanic Lithosphere Due To Differential Freezing Beneath Ridges

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-12-04 DOI: 10.1029/2024GL109440

Shi Joyce Sim, Ting-Ying Yu, Chris Havlin

{"title":"Persistent Heterogeneities in the Oceanic Lithosphere Due To Differential Freezing Beneath Ridges","authors":"Shi Joyce Sim, Ting-Ying Yu, Chris Havlin","doi":"10.1029/2024GL109440","DOIUrl":"10.1029/2024GL109440","url":null,"abstract":"Oceanic lithosphere, which forms two-thirds of Earth's surface, is generated at mid-ocean ridge spreading centers. Yet the internal structure of the lithosphere is not well characterized and often considered to be homogeneous relative to the structure of continental lithosphere. While geophysical observations clearly delineate the crust-mantle boundary and the lithosphere-asthenopshere boundary, other seismic anomalies known as mid-lithosphere discontinuities (MLDs) have been challenging to detect and poorly constrained. Here we present melt transport models applied to the mid-ocean ridge system that indicate MLDs are a widespread fundamental feature of oceanic lithosphere. In our models, some melt generated from decompression melting is frozen back into the lithosphere, forming a layered refertilization pattern. These refertilized layers are due to the stacked horizontal layering pattern of melt pooling beneath the freezing front. If the recrystallized melt is incorporated into the lithosphere as mafic lenses, the predicted seismic velocity is compatible with observations.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 23","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL109440","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142763086","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

Wave Decay by Submerged Rigid Vegetation Under Orthogonal Wave-Current Conditions

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-12-03 DOI: 10.1029/2024GL110408

Zichen Xu, Jiarui Lei

{"title":"Wave Decay by Submerged Rigid Vegetation Under Orthogonal Wave-Current Conditions","authors":"Zichen Xu, Jiarui Lei","doi":"10.1029/2024GL110408","DOIUrl":"10.1029/2024GL110408","url":null,"abstract":"Coastal vegetation has drawn significant attention as a nature-based solution due to its role in wave attenuation. While the wave energy decay by vegetation has been studied under pure-wave and co-directional wave-current conditions, little research has focused on orthogonal wave-current conditions, which represent propagating waves and longshore currents in natural coastal environments. An analytical model is derived that incorporates various input parameters, including current-to-wave velocity ratio, wave height, wave period, water depth, and vegetation properties, to describe wave decay by rigid submerged vegetation under orthogonal wave-current conditions. Force experienced by individual cylinders was measured, revealing that the drag coefficient of waves is applicable to orthogonal wave-current conditions. Wave heights were measured along vegetation patches. The presence of an orthogonal current significantly enhanced wave decay by vegetation. The findings of this study underscore the more complicated orthogonal wave-current conditions and provide valuable insights for future coastal protection strategies incorporating nature-based solutions.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 23","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL110408","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142760227","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

Improving Land Surface Temperature Estimation in Cloud Cover Scenarios Using Graph-Based Propagation

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-12-03 DOI: 10.1029/2024GL108263

Iain Rolland, Sivasakthy Selvakumaran, Shaikh Fairul Edros Ahmad Shaikh, Perrine Hamel, Andrea Marinoni

{"title":"Improving Land Surface Temperature Estimation in Cloud Cover Scenarios Using Graph-Based Propagation","authors":"Iain Rolland, Sivasakthy Selvakumaran, Shaikh Fairul Edros Ahmad Shaikh, Perrine Hamel, Andrea Marinoni","doi":"10.1029/2024GL108263","DOIUrl":"10.1029/2024GL108263","url":null,"abstract":"Land surface temperature (LST) serves as an important climate variable which is relevant to a number of studies related to energy and water exchanges, vegetation growth and urban heat island effects. Although LST can be derived from satellite observations, these approaches rely on cloud-free acquisitions. This represents a significant obstacle in regions which are prone to cloud cover. In this paper, a graph-based propagation method, referred to as GraphProp, is introduced. This method can accurately obtain LST values which would otherwise have been missing due to cloud cover. To validate this approach, a series of experiments are presented using synthetically obscured Landsat acquisitions. The validation takes place over scenarios ranging from between 10% and 90% cloud cover across six urban locations. In presented experiments, GraphProp recovers missing LST values with a mean absolute error of less than 1.1°C, 1.0°C and 1.8°C in 90% cloud cover scenarios across the studied locations respectively.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 23","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL108263","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142760736","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

Compaction-Driven Convection in the Growing Inner Core

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-12-03 DOI: 10.1029/2024GL110749

K. W. Lim, R. Deguen, D. Cébron, A. Schulze, M. Mandea

引用次数: 0

Comment on “Resolving the Tropical Pacific/Atlantic Interaction Conundrum” by Feng Jiang et al. (2023)

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-12-02 DOI: 10.1029/2024GL111563

Ingo Richter, Noel Keenlyside, Tomoki Tozuka, Yuko Okumura, Chunzai Wang, Ping Chang, Shoichiro Kido, Hiroki Tokinaga

引用次数: 0

The Mechanism of Scale Selection for Mixed Rossby-Gravity Waves in the Upper Troposphere and the Upper Stratosphere

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-12-01 DOI: 10.1029/2024GL110811

S. I. Mahó, N. Žagar, F. Lunkeit, S. Vasylkevych

{"title":"The Mechanism of Scale Selection for Mixed Rossby-Gravity Waves in the Upper Troposphere and the Upper Stratosphere","authors":"S. I. Mahó, N. Žagar, F. Lunkeit, S. Vasylkevych","doi":"10.1029/2024GL110811","DOIUrl":"10.1029/2024GL110811","url":null,"abstract":"Mixed Rossby-gravity (MRG) waves play a significant role in tropical variability. Their kinetic energy spectra exhibit maximal amplitudes at synoptic scales in the upper troposphere and at planetary scales in the upper stratosphere. The mechanism for different scale selection in the two regions has remained elusive. Here, we use a spherical barotropic model with the background zonal wind profiles derived from ERA5 reanalysis to show that the recently introduced MRG wave excitation mechanism <math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>−</mo>\u0000 </mrow>\u0000 <annotation> ${-}$</annotation>\u0000 </semantics></math> wave-mean flow interactions produces MRG waves with the observed scale properties in the two regions. Simulations with idealized zonal jets show that the jet position determines the MRG scale selection: the closer the jet to the equator, the smaller the scale of the excited MRG waves. Therefore, midlatitude jets, such as found in the upper stratosphere, support the excitation of planetary-scale MRG waves.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 23","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL110811","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142758641","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

Manifestations of Strong IMF-By on the Equatorial Ionospheric Electrodynamics During 10 May 2024 Geomagnetic Storm

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-12-01 DOI: 10.1029/2024GL112569

Geeta Vichare, Mala S. Bagiya

{"title":"Manifestations of Strong IMF-By on the Equatorial Ionospheric Electrodynamics During 10 May 2024 Geomagnetic Storm","authors":"Geeta Vichare, Mala S. Bagiya","doi":"10.1029/2024GL112569","DOIUrl":"10.1029/2024GL112569","url":null,"abstract":"Understanding the effects of east-west component of interplanetary magnetic field (IMF-By) on the equatorial ionospheric electrodynamics is challenging due to the complex response caused by the simultaneous occurrence of multiple mechanisms during disturbed times. The extreme geomagnetic storm on 10 May 2024 caused by multiple-ICME interactions accompanied with unprecedented IMF-By magnitudes and its polarity, changed from west to east by 130 nT during northward IMF-Bz turning. The ground ionosonde observations of h’F from near-equatorial locations, along with the latitudinal profiles of plasma densities from Swarm satellites reveal the first observational evidence of the impact of strong IMF-By near the dusk-terminator (17–19.5 LT), causing strong dawn-to-dusk ionospheric electric fields during northward IMF-Bz. This electric field produces large uplift of the ionospheric plasma near equator and subsequent super-fountain effect near the dusk. The combined effect of increased IMF-By amplitudes and viscous terms might have resulted into the enhanced coupling of solar wind with the magnetosphere.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 23","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL112569","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142758637","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

On the Temporal Variability of High-Altitude Reflection Potential Structures (HARPS)

IF 4.6 1区地球科学

Geophysical Research Letters Pub Date : 2024-11-30 DOI: 10.1029/2024GL112268

Alex Glocer, Glyn A. Collinson, Rachel Conway, Aroh Barjatya, Robert Michell, Shaosui Xu, David Mitchell, Ellen Robertson, Dennis Chornay, George Khazanov

{"title":"On the Temporal Variability of High-Altitude Reflection Potential Structures (HARPS)","authors":"Alex Glocer, Glyn A. Collinson, Rachel Conway, Aroh Barjatya, Robert Michell, Shaosui Xu, David Mitchell, Ellen Robertson, Dennis Chornay, George Khazanov","doi":"10.1029/2024GL112268","DOIUrl":"10.1029/2024GL112268","url":null,"abstract":"High Altitude Reflection Potential Structures (HARPS) with typical magnitudes of a few tens of volts have been frequently detected above Earth's sunlit polar cap. They are thought to be electrostatic structures forming between 1 to several Earth radii in altitude. Previous satellite studies have been unable to probe the temporal variability of their magnitude owing to their fast motion through the region of observation. In this study, we present a <math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 </mrow>\u0000 <annotation> ${sim} $</annotation>\u0000 </semantics></math>10 min time series of observations of HARPS from NASA's Endurance sounding rocket. These observations were made from a spatially localized region, enabling the first experimental investigation of the temporal variability of HARPS. The magnitude of the potential drop was found to vary unexpectedly rapidly between 15.5 and 23.7 V on a time cadence of <math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>≤</mo>\u0000 <mn>10</mn>\u0000 </mrow>\u0000 <annotation> ${le} 10$</annotation>\u0000 </semantics></math> s. We additionally find an inverse correlation between polar rain precipitating flux and reflection potential magnitude, consistent with predictions from prior theoretical work.","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"51 23","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL112268","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756279","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