Journal of Geophysical Research: Atmospheres最新文献

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Hailstorm Events Over a Maritime Tropical Region: Storm Environments and Characteristics 海洋热带地区冰雹事件:风暴环境和特征
IF 3.8 2区 地球科学
Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-15 DOI: 10.1029/2024JD042718
Fitria Puspita Sari, Sonia Lasher-Trapp
{"title":"Hailstorm Events Over a Maritime Tropical Region: Storm Environments and Characteristics","authors":"Fitria Puspita Sari,&nbsp;Sonia Lasher-Trapp","doi":"10.1029/2024JD042718","DOIUrl":"https://doi.org/10.1029/2024JD042718","url":null,"abstract":"<p>In recent years, the Maritime Tropics (mT) have reported an increase in hail events, including five occurrences over Surabaya, Indonesia. Past studies of mT hailstorms have been limited to individual case studies. A more comprehensive study is needed to improve understanding of hailstorms in this region, and may also provide new insights into the requirements for hailstorms worldwide. This study uses simulations of five recent hailstorms created with the Weather Research and Forecasting Model to evaluate the pre-storm environments, and five additional simulations help differentiate these environments from those associated with storms that lacked hailfall. Compared to other regions experiencing hailstorms, the mT environments exhibit moderate CAPE, much less deep-layer shear, and much higher low-level specific humidity. These environmental conditions typically result in ordinary single-cell, pulse-type storms. The introduction of a new variable, NetCAPE (the net value of CAPE after accounting for precipitation loading and any CIN at lower levels), demonstrates potential in distinguishing hail from no-hail events in the mT. The median NetCAPE for the five hail events is over 40% greater within various depths of the hail growth zone, and when combined with lower near-surface relative humidity and melting level heights, differentiates most hail from no-hail cases.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 10","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD042718","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Monitoring Daily All-Sky Evapotranspiration Over the East Asian Continent Using Multi-Channel Passive Microwave Measurements From Fengyun-3B Satellite of China
IF 3.8 2区 地球科学
Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-13 DOI: 10.1029/2025JD043317
Yipu Wang, Jiheng Hu, Rui Li, Peng Zhang, Binbin Song, Qingyang Liu
{"title":"Monitoring Daily All-Sky Evapotranspiration Over the East Asian Continent Using Multi-Channel Passive Microwave Measurements From Fengyun-3B Satellite of China","authors":"Yipu Wang,&nbsp;Jiheng Hu,&nbsp;Rui Li,&nbsp;Peng Zhang,&nbsp;Binbin Song,&nbsp;Qingyang Liu","doi":"10.1029/2025JD043317","DOIUrl":"https://doi.org/10.1029/2025JD043317","url":null,"abstract":"<p>Terrestrial evapotranspiration (ET) modulates energy and water cycles of land-atmosphere continuum. Satellite daily ET estimation under all sky (both clear and cloudy sky) remains challenging due to the difficulty in detecting vegetation dynamics under cloud cover. In this study, we utilized the microwave land surface Emissivity Difference Vegetation Index (EDVI) at X- and K-bands, which was retrieved from Chinese Fengyun-3B satellite Microwave Radiation Imager (MWRI) measurements under all sky conditions, to derive daily ET (ET<sub>FYEDVI</sub>) over East Asia (80–145°E, 10–55°N) from 2016 to 2018, in combination with multi-source satellite all-sky radiation and ERA5 climatic data. The Fengyun-3B EDVI was used to represent the key vegetation characteristic for allocating total available energy and constraining canopy conductance. ET<sub>FYEDVI</sub> was validated at multiple spatiotemporal scales, against daily in situ measurements from eight flux sites and annual water balance method at nine river basins. Site-scale validations showed that ET<sub>FYEDVI</sub> generated overall good accuracy (<i>R</i><sup>2</sup> = 0.78, bias of −0.1 mm day<sup>−1</sup>) across forest, grass, crop, and desert sites. Basin-scale evaluations further demonstrated the stable and small bias (<i>R</i><sup>2</sup> of 0.96, bias of −22.2 mm year<sup>−1</sup>) in annual ET<sub>FYEDVI</sub> from southern humid to arid inland basins. This accuracy was comparable or better than those of four global satellite ET products. More importantly, ET<sub>FYEDVI</sub> produced low and stable accumulative bias under increasing cloud conditions, and characterized the spatiotemporal variability in continental ET even under heavy cloud cover (&gt;90%) conditions. This study marks the first attempt to use Fengyun-3 satellite passive microwave measurements to produce continental-scale ET, showing great potential for mapping spatiotemporally continuous global daily ET.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 10","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simulating Mixed-Phase Clouds Over Coastal Antarctica During a Significant Snowfall Event in a High-Resolution Regional Model
IF 3.8 2区 地球科学
Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-13 DOI: 10.1029/2024JD042311
Zhangcheng Pei, Sonya L. Fiddes, Marc D. Mallet, Simon P. Alexander, Kalli Furtado, Greg Roff, Alain Protat, Adrian McDonald, W. John R. French
{"title":"Simulating Mixed-Phase Clouds Over Coastal Antarctica During a Significant Snowfall Event in a High-Resolution Regional Model","authors":"Zhangcheng Pei,&nbsp;Sonya L. Fiddes,&nbsp;Marc D. Mallet,&nbsp;Simon P. Alexander,&nbsp;Kalli Furtado,&nbsp;Greg Roff,&nbsp;Alain Protat,&nbsp;Adrian McDonald,&nbsp;W. John R. French","doi":"10.1029/2024JD042311","DOIUrl":"https://doi.org/10.1029/2024JD042311","url":null,"abstract":"<p>Global climate models and reanalysis products have revealed large, persistent downwelling shortwave radiation biases over the Southern Ocean and coastal Antarctica, likely caused by the incapability of models to accurately simulate frequent low-level mixed-phase clouds in these regions. In this study, we use the ground-based observations collected at Davis, Antarctica during the Precipitation over Land and The Southern Ocean field campaign in austral summer of 2019 to assess the capability of the high-resolution regional Unified Model (UM) to reproduce precipitating clouds off coastal Antarctica. We test the new UM RAL3 (Regional Atmosphere and Land 3) configuration with double-moment Cloud AeroSol Interacting Microphysics scheme and bimodal cloud fraction scheme, running at the spatial resolution of 1.5-km. We compare it to the previous RA2M configuration with a single-moment cloud microphysics scheme and unimodal cloud fraction scheme. The RAL3 exhibits marginally degraded meteorological conditions relative to RA2M compared with observations. For cloud properties, the UM regional models can generally simulate the phase, vertical structure and timing of events during the sublimation and precipitation periods. Nevertheless, overestimated ice water path and potentially underestimated liquid water path (LWP) contribute to positive surface shortwave biases and negative longwave biases. The RA2M simulates more LWP, though we suggest for the wrong reasons due to its ice nucleating parameterization. Our results suggest that the new double-moment cloud microphysics combined with bimodal cloud fraction parameterizations, while having reduced performance in some respects, has large potential to better represent low-level mixed phase clouds for this region.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 10","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD042311","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Nonparametric Estimation of Temperature Response to Volcanic Forcing
IF 3.8 2区 地球科学
Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-13 DOI: 10.1029/2024JD042519
Eirik Rolland Enger, Rune Graversen, Audun Theodorsen
{"title":"Nonparametric Estimation of Temperature Response to Volcanic Forcing","authors":"Eirik Rolland Enger,&nbsp;Rune Graversen,&nbsp;Audun Theodorsen","doi":"10.1029/2024JD042519","DOIUrl":"https://doi.org/10.1029/2024JD042519","url":null,"abstract":"<p>Large volcanic eruptions strongly influence the internal variability of the climate system. Reliable estimates of the volcanic eruption response as simulated by climate models are needed to reconstruct past climate variability. Yet, the ability of models to represent the response to both single-eruption events and a combination of eruptions remains uncertain. We use the Community Earth System Model version 2 along with the Whole Atmosphere Community Climate Model version 6, known as CESM2(WACCM6), to study the global-mean surface temperature (GMST) response to idealized single volcano eruptions at the equator, ranging in size from Mt. Pinatubo-type events to supereruptions. Additionally, we simulate the GMST response to double-eruption events with eruption separations of a few years. For large idealized eruptions, we demonstrate that double-eruption events separated by 4 years combine linearly in terms of GMST response. In addition, the temporal development is similar across all single volcanic eruptions injecting at least 400 Tg <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mfenced>\u0000 <msub>\u0000 <mrow>\u0000 <mi>S</mi>\u0000 <mi>O</mi>\u0000 </mrow>\u0000 <mn>2</mn>\u0000 </msub>\u0000 </mfenced>\u0000 </mrow>\u0000 <annotation> $left({mathrm{S}mathrm{O}}_{2}right)$</annotation>\u0000 </semantics></math> into the atmosphere. Because only a few eruptions in the past millennium occurred within 4 years of a previous eruption, we assume that the historical record can be represented as a superposition of single-eruption events. Hence, we employ a deconvolution method to estimate a nonparametric historical GMST response pulse function for volcanic eruptions, based on climate simulation data from 850 to 1850 taken from a previous study. By applying the estimated GMST response pulse function, we can reconstruct most of the underlying historical GMST signal. Furthermore, the GMST response is significantly perturbed for at least 7 years following eruptions.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 10","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Insights Into Summertime Surface Ozone Formation From Diurnal Variations in Formaldehyde and Nitrogen Dioxide Along a Transect Through New York City 从纽约市横断面甲醛和二氧化氮的日变化观察夏季地表臭氧的形成
IF 3.8 2区 地球科学
Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-12 DOI: 10.1029/2024JD040922
Madankui Tao, Arlene M. Fiore, Alexandra Karambelas, Paul J. Miller, Lukas C. Valin, Laura M. Judd, Maria Tzortziou, Andrew Whitehill, Amanda Teora, Yuhong Tian, Kevin L. Civerolo, Daniel Tong, Siqi Ma, Susana B. Adamo, Tracey Holloway
{"title":"Insights Into Summertime Surface Ozone Formation From Diurnal Variations in Formaldehyde and Nitrogen Dioxide Along a Transect Through New York City","authors":"Madankui Tao,&nbsp;Arlene M. Fiore,&nbsp;Alexandra Karambelas,&nbsp;Paul J. Miller,&nbsp;Lukas C. Valin,&nbsp;Laura M. Judd,&nbsp;Maria Tzortziou,&nbsp;Andrew Whitehill,&nbsp;Amanda Teora,&nbsp;Yuhong Tian,&nbsp;Kevin L. Civerolo,&nbsp;Daniel Tong,&nbsp;Siqi Ma,&nbsp;Susana B. Adamo,&nbsp;Tracey Holloway","doi":"10.1029/2024JD040922","DOIUrl":"https://doi.org/10.1029/2024JD040922","url":null,"abstract":"<p>Estimating tropospheric ozone (O<sub>3</sub>) production from observations is challenging but possible given the close coupling of O<sub>3</sub> with formaldehyde (HCHO) and nitrogen dioxide (NO<sub>2</sub>), two remotely sensed air pollutants. The previous reliance on once-daily satellite overpasses highlights the need to study diurnal changes and surface-column relationships. Using surface observations, Pandora spectrometer retrievals, and a high-resolution (1.33 km) air quality model (WRF-CMAQ), we characterize diurnal patterns of HCHO and NO<sub>2</sub> at seven locations along an upwind-downwind pathway through New York City during June–August 2018. Diurnal patterns of limited surface HCHO measurements suggest biogenic emission influence, while a bimodal surface NO<sub>2</sub> pattern indicates the impact of local anthropogenic nitrogen oxides emissions. Details of these patterns vary by site: an afternoon NO<sub>2</sub> spike at New Haven (CT) indicates traffic emissions, while a delayed daily HCHO peak at Westport (CT) relative to other sites likely reflects sea breeze dynamics. Peak column concentrations generally lag surface peaks by about four hours, occurring at 9–10 a.m. for morning NO<sub>2</sub> (from Pandora and WRF-CMAQ) and around 4 p.m. for midday HCHO (from WRF-CMAQ). TROPOMI overpass time at 1:30 p.m. misses peak column HCHO and NO<sub>2</sub> concentrations. A box model (F0AM) constrained with site-level observations and WRF-CMAQ fields indicates 1–9 ppb hr<sup>−1</sup> higher noontime local O<sub>3</sub> production rates on three sets of paired high- versus mid-to-low-O<sub>3</sub> days. F0AM sensitivity analyses on these six days suggest a predominantly transitional O<sub>3</sub> formation regime at urban and downwind sites, differing at some sites from the NO<sub>x</sub>-saturated regime diagnosed for summertime average conditions via the weekday-weekend effect.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD040922","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143939119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
An Accurate Shortwave Gaseous Transmittance Scheme Using Modified Alternate Mapping Correlated K-Distribution Method 基于改进交替映射相关k分布法的短波气体精确透射率方案
IF 3.8 2区 地球科学
Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-12 DOI: 10.1029/2024JD041921
Yue Cai, Feng Zhang, Jiangnan Li, Kun Wu, Quan Yang
{"title":"An Accurate Shortwave Gaseous Transmittance Scheme Using Modified Alternate Mapping Correlated K-Distribution Method","authors":"Yue Cai,&nbsp;Feng Zhang,&nbsp;Jiangnan Li,&nbsp;Kun Wu,&nbsp;Quan Yang","doi":"10.1029/2024JD041921","DOIUrl":"https://doi.org/10.1029/2024JD041921","url":null,"abstract":"<p>This paper introduces a newly developed shortwave gaseous transmittance scheme, essentially for rapid atmospheric radiation models. It quantifies the absorption and scattering properties of gases in radiation, highlighting the crucial balance between accuracy and efficiency that affects model performance. The proposed scheme builds on the alternate mapping correlated K-distribution method. A more efficient algorithm is implemented, which reduces the need for manual intervention in determining the number of subintervals required for pseudo-monochromatic calculations in the gaseous transmittance scheme. We propose a variant alternate mapping method, that restores the monotonicity of Rayleigh scattering in the cumulative probability space after extracting strong absorption wavenumbers. This modification improves the accuracy of the simulated upward radiation flux in visible bands. Additionally, by incorporating a wider range of atmospheric profiles into the optimization of the gas-optics look-up table, our scheme demonstrates improved generalization capability. Moreover, we offer a clear physical interpretation of the optimization process. Evaluations using realistic profiles from the Correlated K-Distribution Model Inter-Comparison Project demonstrate that our shortwave gaseous transmittance scheme, which requires only 80 pseudo-monochromatic spectral points, offers significant advantages in calculating radiation flux and heating rates across various scenarios.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 10","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Typhoon In-Fa (2021) Near Surface Wind Field Characteristics Based on Lidar Observations 基于激光雷达观测的台风“寅法”(2021)近地面风场特征
IF 3.8 2区 地球科学
Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-12 DOI: 10.1029/2024JD043184
Yanghao Lu, Yubin Li, Jie Tang, Zhiqiu Gao
{"title":"Typhoon In-Fa (2021) Near Surface Wind Field Characteristics Based on Lidar Observations","authors":"Yanghao Lu,&nbsp;Yubin Li,&nbsp;Jie Tang,&nbsp;Zhiqiu Gao","doi":"10.1029/2024JD043184","DOIUrl":"https://doi.org/10.1029/2024JD043184","url":null,"abstract":"<p>This study analyzes the surface winds of Typhoon In-fa during landfall at a coastal area using Doppler wind lidar (DWL) observations in the Plane Position Indicator (PPI) scanning mode. High-resolution (30 m) wind field structures in the lower boundary layer at the land-sea interface were derived using the velocity-azimuth display technique. This approach captures the wind field structure in unprecedented detail at the scale of tens of meters, providing a fine-scale view of the coastal wind field during typhoon landfall. It was found that stronger winds were predominantly located at the periphery of the scanning area, where the underlying surface is water, whereas weaker winds tended to occur near the radar, where the underlying surface is land. Analysis of vorticity and divergence revealed small-scale vortex structures, approximately 100 m in size, embedded within the large-scale circulation of the typhoon. These structures became less distinct as the typhoon center approached. Furthermore, the turbulent energy spectrum derived from the directly observed radial winds followed Kolmogorov's −5/3 law, indicating that the turbulence was generally isotropic. Additionally, the turbulent kinetic energy (TKE) calculated from the DWL data showed good agreement with previous tower-based observations, particularly in terms of the relationship between TKE and wind speed, confirming the reliability of DWL measurements in capturing turbulence characteristics. These results suggest that DWL can serve as an effective alternative for future turbulence observations during typhoon landfall.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 10","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cloud Properties in Hailstorms Over the Contiguous United States: A Perspective From GOES Advanced Baseline Imager's One-Min Rapid Scan 美国连续冰雹的云特性:来自GOES高级基线成像仪一分钟快速扫描的视角
IF 3.8 2区 地球科学
Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-10 DOI: 10.1029/2024JD042711
Yujia Zhang, Xiang Ni
{"title":"Cloud Properties in Hailstorms Over the Contiguous United States: A Perspective From GOES Advanced Baseline Imager's One-Min Rapid Scan","authors":"Yujia Zhang,&nbsp;Xiang Ni","doi":"10.1029/2024JD042711","DOIUrl":"https://doi.org/10.1029/2024JD042711","url":null,"abstract":"<p>The mesoscale domain sector (MDS) of GOES-16 Advanced Baseline Imager offers 1-min rapid detection, providing significant advantages in analyzing the evolution of cloud-top properties in severe storms like hailstorms. This study investigated the spatiotemporal evolution of five cloud-top properties in 6,847 hailstorms over the CONUS from 2020 to 2022 with gridded MDS’ observations. In the 0.1° × 0.1° area centered around the hail report location and within 121 min around hail report time, macroscopic cloud-top features (such as cloud depth) typically exhibit single-peaked characteristics, reaching extreme values around the hail report time (0th min). Cloud particle size (CPS) gradually increases before the hail report time, then decreases and stabilizes after the 24th min. The region experiences cooling before the 1st min, which then shifts to a warming trend. The hailstorms with different intensity showed discrepant temporal evolutions. Generally, the large hail has lower minimum cloud-top temperature (CTT), higher maximum cloud-top height (CTH) and stronger updraft than the small hail. Cloud-top properties also exhibit variations across different seasons, with winter demonstrating earlier occurrences of minimum CTT and maximum CPS. Spatially, the grid with minimum CTT and maximum CTH firstly moves southeastward and then moves northeastward. These analyses on the evolutions of cloud features in hailstorms could promote the understanding in the rapid developments of severe convection and the monitoring of severe weather.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Plume Dynamics Drive Extreme Long-Range Spotting During California's Dixie Fire 在加州迪克西大火期间,羽流动力学驱动了极端的远程观测
IF 3.8 2区 地球科学
Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-10 DOI: 10.1029/2024JD043167
N. P. Lareau
{"title":"Plume Dynamics Drive Extreme Long-Range Spotting During California's Dixie Fire","authors":"N. P. Lareau","doi":"10.1029/2024JD043167","DOIUrl":"https://doi.org/10.1029/2024JD043167","url":null,"abstract":"<p>Observations reveal extreme long-range fire spotting occurred during California's Dixie Fire. Specifically, we describe the occurrence of remarkable 9, 12, and 16 km spotting events on 16 August 2021. Radar data reveal these spot fires are linked to bent-over but deep convective plumes with plume tops reaching 10–12 km MSL. These plumes have characteristic lofting regions in the fire-generated updrafts and pyrometeor fall out locations in the downwind subsiding portion of the plume. Infrared data indicate spot fires occur along the plume's central axis. The cross winds impacting the plume rise and pyrometeor transport were ∼15 m s<sup>−1</sup>, and the inferred transit time firebrands causing the longest-range spot fire is ∼18 min. We also provide photographic evidence for large, partially burned pyrometeors at a range of ∼20 km from the fire and link these data to Ka-band radar observations showing pyrometeor pulses and fall out over the observing site. The results of the study suggest that operational and research radars may be able to isolate periods conducive to long range spotting in near real-time.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD043167","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
The Key Role of Mixed-Phase and Ice-Phase Processes on the Seasonal Shifts in Drop Size Distribution on the Southeastern Tibetan Plateau 混合相和冰相过程对青藏高原东南部降水大小分布季节变化的关键作用
IF 3.8 2区 地球科学
Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-10 DOI: 10.1029/2024JD042543
Xin Xu, Xuelong Chen, Lulin Xue, Yajing Liu, Qiang Zhang, Yaoming Ma
{"title":"The Key Role of Mixed-Phase and Ice-Phase Processes on the Seasonal Shifts in Drop Size Distribution on the Southeastern Tibetan Plateau","authors":"Xin Xu,&nbsp;Xuelong Chen,&nbsp;Lulin Xue,&nbsp;Yajing Liu,&nbsp;Qiang Zhang,&nbsp;Yaoming Ma","doi":"10.1029/2024JD042543","DOIUrl":"https://doi.org/10.1029/2024JD042543","url":null,"abstract":"<p>This study explores the microphysical characteristics of precipitation on the southeastern Tibetan Plateau (SETP), with a focus on the seasonal variations in drop size distribution (DSD) during distinct monsoon phases. By analyzing long-term observations from a high-altitude region, we uncover a significant differentiation in raindrop concentrations: small raindrops peak during the monsoon phase due to enhanced warm-cloud processes, minimal evaporation rates, and vigorous moisture deposition from sustained humid airflow. Conversely, the premonsoon phase is marked by a higher concentration of large raindrops, primarily driven by strong aggregation and vigorous convective activity. Our results reveal that mixed-phase processes dominate the precipitation microphysics in this region with substantial implications for understanding the underlying mechanisms that govern precipitation variability in high-altitude environments. The interplay between atmospheric dynamics and microphysical processes is crucial in shaping the DSD, highlighting the importance of considering both factors in precipitation modeling. This research not only provides novel insights into the complex interactions between microphysical processes and meteorological conditions but also emphasizes the necessity for enhanced precipitation forecasting models, particularly in regions characterized by complex terrain. These findings offer a foundation for future studies aimed at addressing the impacts of climate change on precipitation patterns and water resource management in the Tibetan Plateau and similar high-altitude regions.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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