Journal of Geophysical Research: Atmospheres最新文献_第8页

Stratospheric Aerosol Backscatter and Depolarization Ratio Observed With Ground-Based Lidar at Tsukuba, Japan, and Lauder, New Zealand

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-04-03 DOI: 10.1029/2024JD041329

T. Sakai, O. Uchino, T. Nagai, B. Liley, R. Querel, I. Morino, Y. Jin, T. Fujimoto, E. Oikawa, N. Oshima

{"title":"Stratospheric Aerosol Backscatter and Depolarization Ratio Observed With Ground-Based Lidar at Tsukuba, Japan, and Lauder, New Zealand","authors":"T. Sakai, O. Uchino, T. Nagai, B. Liley, R. Querel, I. Morino, Y. Jin, T. Fujimoto, E. Oikawa, N. Oshima","doi":"10.1029/2024JD041329","DOIUrl":"https://doi.org/10.1029/2024JD041329","url":null,"abstract":"Vertical distributions of stratospheric aerosol backscatter and depolarization ratio (nonsphericity) have been measured using ground-based lidars at Tsukuba, Japan and Lauder, New Zealand. The observational results after 2003 show that the aerosol increased several times after large volcanic eruptions and wildfires. The largest increases in vertically integrated stratospheric aerosol backscattering coefficient (IBC) above 16.5 km (IBC16.5) were observed after the Raikoke volcanic eruption in 2019 at Tsukuba and the Australian wildfire in 2019/20 at Lauder. The increased IBC16.5 returned to normal levels in 1–2 years. After the volcanic eruptions, the particle depolarization ratio (PDR) increased for several days and then decreased in a few dozen days in most cases. In contrast, the increased PDR after the large wildfires gradually decreased in 1–2 years. These suggest that large volcanic ash was quickly removed to the troposphere or dissolved in or coated with liquid to become non-depolarizing. In contrast, the wildfire smoke stays in the stratosphere for a few years due to its small size and mass density. We compare the lidar-derived stratospheric aerosol extinction coefficient profiles and the optical depth (stratospheric aerosol optical depth (SAOD)) with those obtained with a balloon-borne optical particle counter (OPC), satellite-borne instruments (SAGE-II, Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP), and Global Space-based Stratospheric Aerosol Climatology (GloSSAC)), and the Meteorological Research Institute Earth System Model (MRI-ESM2) for the validation. The mean differences from lidar-derived SAOD were +15% for SAGE-II, −11% for GloSSAC, +32% for CALIOP, and −44% for MRI-ESM2 at Tsukuba, and +19% for the SAGE-II, +28% for OPC, +7% for CALIOP, −15% for GloSSAC, and −72% from MRI-ESM2 at Lauder.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 7","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770224","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

How South Asian Thunderstorm-Driven Transport Affects the Atmospheric Composition Over the Tibetan Plateau and Stratosphere

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-04-03 DOI: 10.1029/2024JD043195

Xiaotong Li, Xueke Wu, Ding Jia, Jiahao Lin, Yuhang Hu, Xiaoteng Huang, Jiali Luo, Guohao Hu

{"title":"How South Asian Thunderstorm-Driven Transport Affects the Atmospheric Composition Over the Tibetan Plateau and Stratosphere","authors":"Xiaotong Li, Xueke Wu, Ding Jia, Jiahao Lin, Yuhang Hu, Xiaoteng Huang, Jiali Luo, Guohao Hu","doi":"10.1029/2024JD043195","DOIUrl":"https://doi.org/10.1029/2024JD043195","url":null,"abstract":"The Tibetan Plateau (TP) is an important gateway for tropospheric substances enter the stratosphere. South Asia, especially its northwesternmost part, is emerging as a global hotspot for thunderstorms and lightning, driven by dynamic interactions between the orography of the TP and the South Asian Summer Monsoon (SASM). This study used TRMM satellite observations from 1998 to 2013, combined with ERA-5 reanalysis data and the HYSPLIT trajectory model, to comprehensively investigate how thunderstorms in the region impact the atmospheric composition over the TP. The findings reveal that thunderstorms in the region predominantly occur during the SASM. Spatially, these thunderstorms are concentrated along the southern Himalayan front, especially in the westernmost indentation between the TP and the Iranian Plateau, an area also characterized by heavy anthropogenic pollution. By employing the HYSPLIT model to trace transport pathways associated with the thunderstorm, the study demonstrates a clear convergence of pollutants from the South Asia boundary layer into thunderclouds. Furthermore, three principal transport pathways were identified for substances originating from the tops of thunderstorms entering the TP. These pathways are closely linked to the tropospheric westerlies, the anticyclonic circulation of the South Asian High, and processes penetrating the tropopause, accounting for approximately 58%, 33%, and 9% of thunderstorms, respectively. Notably, the impact of these thunderstorm-driven transport processes on the TP and even the lower stratosphere is expected to intensify as thunderstorms become more frequent and pollution levels rise in South Asia due to global warming and local social development.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 7","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770228","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

Observation and Simulation of Methane Plumes During the Morning Boundary Layer Transition

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-04-03 DOI: 10.1029/2024JD042317

Xiao-Ming Hu, Wesley T. Honeycutt, Chenghao Wang, Binbin Weng, Bowen Zhou, Ming Xue

{"title":"Observation and Simulation of Methane Plumes During the Morning Boundary Layer Transition","authors":"Xiao-Ming Hu, Wesley T. Honeycutt, Chenghao Wang, Binbin Weng, Bowen Zhou, Ming Xue","doi":"10.1029/2024JD042317","DOIUrl":"https://doi.org/10.1029/2024JD042317","url":null,"abstract":"Methane (CH4) contributes significantly to global warming. However, accurate identification of CH4 sources for reducing CH4 emissions is often hampered by inadequate accuracy and spatiotemporal coverage of CH4 detection, and lack of accurate CH4 forward modeling used in top-down inversion systems. In this study, a field experiment was conducted in Pampa, Texas using two CH4 sensors (LI-COR and OGI camera) to detect CH4 releases. We investigated whether high-resolution simulations using the Weather Research and Forecasting (WRF) model with greenhouse gases (WRF-GHG) could accurately simulate the CH4 plumes in the presence of evolving atmospheric boundary layer from sunrise to noon. CH4 plumes showed substantial variation in time. At a release rate of ∼17.5 kg hr−1, the maximum enhancement of CH4 measured by LI-COR was 2.6 ppm at sunrise (7:36 a.m.), 250 m from the release location. Within half an hour after sunrise, this enhancement decreased to 0.3–0.4 ppm. The enhancement was 0.2 ppm by 10:00 a.m. and further dropped to less than 0.1 ppm after 11:30 a.m. Due to the low temperature at sunrise, the OGI camera failed to detect the CH4 plume. The WRF-GHG large-eddy simulation (LES) with 32 m grid spacing successfully reproduced these CH4 enhancements. In situ measurements together with numerical simulations illustrate the impact of the transition from a stable boundary layer in the early morning to a convective boundary layer at noon on the dispersion of CH4 plumes. Additionally, CH4 plumes from a cattle farm in Oklahoma are briefly examined using the same modeling approach.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 7","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770493","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

Performance of Airborne Imaging Spectrometers for Carbon Dioxide Detection and Emission Quantification

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-04-03 DOI: 10.1029/2024JD042755

Jinsol Kim, Daniel H. Cusworth, Alana K. Ayasse, Katherine Howell, Kelly O’Neill, Riley M. Duren

{"title":"Performance of Airborne Imaging Spectrometers for Carbon Dioxide Detection and Emission Quantification","authors":"Jinsol Kim, Daniel H. Cusworth, Alana K. Ayasse, Katherine Howell, Kelly O’Neill, Riley M. Duren","doi":"10.1029/2024JD042755","DOIUrl":"https://doi.org/10.1029/2024JD042755","url":null,"abstract":"Carbon dioxide (CO2) emissions from strong point sources account for a significant proportion of the global greenhouse gas emissions, and their associated uncertainties in bottom-up estimates remain substantial. Imaging spectrometers provide a capability to monitor large point source CO2 emissions and help reduce the uncertainties. In this study, we assess the capability of an airborne monitoring system with temporally sparse observations to constrain annual emissions at both facility and regional scales. We use observations of power plant emissions from 2022 to 2023 and compare the derived emission rates at facility scale to in stack emission observations across the United States. We show that CO2 concentration enhancements retrieved using a lognormal matched filter are suitable for CO2 quantification, achieving low bias and uncertainty in estimated emission rates. We find that annual emissions at the regional scale can be effectively constrained by offsetting errors identified at the facility scale, with a 30% uncertainty.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 7","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD042755","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770229","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

Modulations of Atmospheric River Climatology by the Stratospheric Quasi-Biennial Oscillation

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-03-31 DOI: 10.1029/2024JD042390

Kai Huang, Christine A. Shields, Kirsten R. Hall, Jadwiga H. Richter, Yuanpu Li, Chih-Chieh-Jack Chen

{"title":"Modulations of Atmospheric River Climatology by the Stratospheric Quasi-Biennial Oscillation","authors":"Kai Huang, Christine A. Shields, Kirsten R. Hall, Jadwiga H. Richter, Yuanpu Li, Chih-Chieh-Jack Chen","doi":"10.1029/2024JD042390","DOIUrl":"https://doi.org/10.1029/2024JD042390","url":null,"abstract":"This study reveals the significant Quasi-Biennial Oscillation (QBO) influences on the seasonal atmospheric river (AR) climatology around the globe. The North Pacific (NP) AR climatology in the boreal winter to early fall seasons in a QBO easterly (QBOE) phase is systematically shifted poleward compared with those in a QBO westerly (QBOW) phase, and such difference peaks in the local late spring season. We also find the similar poleward shift for the AR climatology over the South Pacific (SP) in the austral winter seasons in the QBOE phase. A significant equatorward shift and an overall enhancement of the AR climatology over the SP are observed in the QBOE phase during local spring and summer seasons, respectively. The QBO impacts on the AR climatology over the Atlantic Ocean are less organized. Strong QBO impacts exist in almost all seasons for the North Atlantic AR but only in the austral spring season for the South Atlantic AR. These QBO modulations of the AR climatology over the ocean basins also change the season-mean AR frequencies around coastal regions, suggesting significant QBO impacts on the local land-falling AR events. The QBO modulations of the seasonal background mean states and the MJO-teleconnections are two potential mechanisms mostly over the north hemisphere. The QBOE modulation of the Madden-Julian Oscillation (MJO)-teleconnection over the northern hemisphere is asymmetric between the MJO convection over the Indian Ocean and that over the Pacific Ocean, which is the key to explain the QBO influences on the AR activity on the seasonal timescale.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 7","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143741657","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

The Boreal Summer Rainfall Changes in Eastern China and Associated Spatial Heterogeneous Jets Variations During the Arctic Amplification Period

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-03-29 DOI: 10.1029/2024JD042874

Yuting Liu, Daokai Xue, Danqing Huang

{"title":"The Boreal Summer Rainfall Changes in Eastern China and Associated Spatial Heterogeneous Jets Variations During the Arctic Amplification Period","authors":"Yuting Liu, Daokai Xue, Danqing Huang","doi":"10.1029/2024JD042874","DOIUrl":"https://doi.org/10.1029/2024JD042874","url":null,"abstract":"Arctic surface temperature rising has been three times faster than the globe, referred to as the Arctic amplification (AA). However, the changes of boreal summer rainfall in eastern China and associated physical mechanisms during the AA period are still under investigation. In this study, we explored the boreal summer meridional quadrupolar rainfall changes in eastern China during the AA period, distributed as positive-negative-positive-negative anomaly pattern form north to south in eastern China. This pattern is significantly linked with the heterogeneous variations of the polar front jet (PJ) and subtropical jet (SJ), as the PJ displaced poleward over the Eurasia and the SJ displaced equatorward from the North Atlantic to East Asia. Such movement of different branches of jets are referred as the wavier jets that can be maintained by the negative phase of East Atlantic-Europe Pacific teleconnection (−EAUP), which might be associated with the positive phase of the Victoria mode over the North Pacific, the tripole sea surface temperature mode over the North Atlantic, and the reduction of sea ice concentration over Arctic. This study has emphasized the role of the heterogeneous variations of PJ and SJ playing on boreal summer quadrupolar rainfall changes in eastern China during the AA period.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 7","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735497","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

The Sea Spray Generation Function for Large Droplets Based on Sea Salt Aerosol Flux Observation 基于海盐气溶胶通量观测的大液滴海雾生成函数

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-03-29 DOI: 10.1029/2025JD043359

Xueling Cheng, Jiangbo Jin, Peng Fan, Run Guo, Yubin Ma, Jian Huang, Shouyin Zheng, Jiatian Chen, Hengchi Lei, Qingcun Zeng

{"title":"The Sea Spray Generation Function for Large Droplets Based on Sea Salt Aerosol Flux Observation","authors":"Xueling Cheng, Jiangbo Jin, Peng Fan, Run Guo, Yubin Ma, Jian Huang, Shouyin Zheng, Jiatian Chen, Hengchi Lei, Qingcun Zeng","doi":"10.1029/2025JD043359","DOIUrl":"https://doi.org/10.1029/2025JD043359","url":null,"abstract":"Marine droplets, as the largest natural aerosol source after sand and dust, can have a significant impact on climate change, air pollution, typhoons, and other disaster weather. At present, due to the lack of observational data and insufficient understanding of turbulent transport processes in the air-sea boundary layer, there is considerable uncertainty in the generation function of sea spray droplets, especially for droplets with a particle size greater than 20 μm, most of the generation functions underestimate them. The multiple experiments on observing droplets were conducted in the air-sea boundary layer using a self-developed droplet spectrometer. The concentration and upward velocity of large droplets with particle sizes ranging from 25μm to 1.6 mm were obtained. The sea spray generation function was analyzed using the observed data, and the results showed that the sea salt aerosol (SSA) flux of large droplets was much higher than that given by existing sea spray generation functions, providing a new generation function for large droplets in calculating SSA flux in ocean models.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 7","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735498","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

Updating the Baseline Period Affects the Detection of Extreme Climate Change in China 更新基线期对中国极端气候变化检测的影响

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-03-29 DOI: 10.1029/2024JD042704

Lan Li, Tianjun Zhou, Wenxia Zhang

{"title":"Updating the Baseline Period Affects the Detection of Extreme Climate Change in China","authors":"Lan Li, Tianjun Zhou, Wenxia Zhang","doi":"10.1029/2024JD042704","DOIUrl":"https://doi.org/10.1029/2024JD042704","url":null,"abstract":"Extreme climate events significantly impact ecosystems and society. The assessments of extreme events often rely on percentile-based indices using a 30-year baseline period. In China, the Blue Book on Climate Change has traditionally been based on the 1981–2010 baseline period, and it began to use the 1991–2020 baseline period since 2024. However, the impact of baseline changes on assessing extremes in China remains unclear. This study examines how baseline period updates influence the detection of long-term climate change in China, particularly in estimating the Time of Emergence (ToE) for climate change signals. The results show that for temperature extremes, updating the baseline period leads to more (10%∼38%) cold extremes identified by 10th percentile indices and fewer (−32%∼−11%) warm extremes identified by 90th percentile indices across China. It slows the increase in identified warm extremes and accelerates the decrease in cold extremes. It delays the ToE for warm events and advances the ToE for cold events. For precipitation extremes, the update leads to fewer (−12%∼−1%) but more intense (at most 4%) extreme precipitation events identified by 95th and 99th percentile indices across China with slower increases in frequency and faster rises in intensity. The baseline period update advances the ToE for extreme precipitation intensity and delays it for frequency. The update of the baseline significantly affects the assessment of changes in climate extremes in China due to the background warming and wetting in 1991–2020 compared to 1981–2010.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 7","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD042704","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735496","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

Modeling the Black and Brown Carbon Absorption and Their Radiative Impact: The June 2023 Intense Canadian Boreal Wildfires Case Study

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-03-29 DOI: 10.1029/2024JD042674

Paolo Tuccella, Ludovico Di Antonio, Andrea Di Muzio, Valentina Colaiuda, Raffaele Lidori, Laurent Menut, Giovanni Pitari, Edoardo Raparelli

{"title":"Modeling the Black and Brown Carbon Absorption and Their Radiative Impact: The June 2023 Intense Canadian Boreal Wildfires Case Study","authors":"Paolo Tuccella, Ludovico Di Antonio, Andrea Di Muzio, Valentina Colaiuda, Raffaele Lidori, Laurent Menut, Giovanni Pitari, Edoardo Raparelli","doi":"10.1029/2024JD042674","DOIUrl":"https://doi.org/10.1029/2024JD042674","url":null,"abstract":"Black carbon (BC) and brown carbon (BrC) are light-absorbing aerosols with significant climate impacts, but their absorption properties and direct radiative effect (DRE) remain uncertain. We simulated BC and BrC absorption during the intense Canadian boreal wildfires in June 2023 using an enhanced version of CHIMERE chemical and transport model. The study focused on a domain extending from North America to Eastern Europe, including the Arctic up to 85°N. The enhanced model includes an update treatment for BC absorption enhancement and a BrC aging scheme accounting for browning and blanching through oxidation. Validation against Aerosol Robotic Network and satellite data showed the model accurately reproduced aerosol optical depth (AOD) at multiple wavelengths, both near wildfire sources and during transoceanic transport to Europe. Improvements were observed in simulations of absorbing AOD (absorbing aerosol optical) compared with the baseline model. Significant enhancements were achieved in capturing the spatial distribution of aerosol absorption in areas affected by wildfire emissions. For June 2023, the regional all-sky DRE attributed to Canadian wildfires was reduced from −2.1 W/m2 in the control model to −1.9 W/m2 in the enhanced model. This corresponded to an additional warming effect of +0.2 W/m2 (+10%) due to the advanced treatment of BC and BrC absorption. These results indicate the importance of accurate aerosol absorption modeling in regional climate predictions, during large-scale biomass burning events. They also highlight potential overestimations of cooling effects in traditional models, emphasizing the need of improved aerosol parameterization to better simulate the DRE and for evaluating the impacts of mitigation strategies.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 7","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD042674","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735510","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

Atmospheric Aerosols Versus Total Atmospheric Deposition in Guadeloupe (Lesser Antilles): Composition, Concentration, and Flux

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-03-29 DOI: 10.1029/2024JD042682

Yangjunjie Xu-Yang, Rémi Losno, Céline Dessert, Fabrice Monna, Natalie M. Mahowald, Mickael Tharaud

{"title":"Atmospheric Aerosols Versus Total Atmospheric Deposition in Guadeloupe (Lesser Antilles): Composition, Concentration, and Flux","authors":"Yangjunjie Xu-Yang, Rémi Losno, Céline Dessert, Fabrice Monna, Natalie M. Mahowald, Mickael Tharaud","doi":"10.1029/2024JD042682","DOIUrl":"https://doi.org/10.1029/2024JD042682","url":null,"abstract":"Atmospheric mineral dust deposition is an important source of nutrients for ocean and tropical island ecosystems. Direct deposition measurements are generally more reliable at local scale than dust deposition models, even those based on aerosol concentration measurements. Whatever the scale, relevant local observations are necessary for model evaluation. We present here the results obtained by direct measurement of atmospheric aerosols and total atmospheric deposition using a 14-month time series from the Caribbean region. Total deposition velocity, lifetime, and scavenging ratio of major and trace elements were determined. Comparing total deposition fluxes of aluminum (dust proxy) and sea-salt sodium (sea-salt proxy) with Community Atmosphere Model (CAM6) outputs shows that the modeled total deposition rate is underestimated by a factor of two for dust and by a factor of eight for sea salt, while model aerosol concentration is larger than concentration measured near ground level. This result is due to wet deposition being underestimated in the model. The scavenging ratio (w/w) of Saharan dust elements ranges from 95 to 1,390, with a median of 530, close to the geometric mean value of 513. Sea salt presents a greater range of scavenging ratio values, from 325 to 2,355, with a median of 1,180, close to the geometric mean value of 1,030. The lead isotope ratio 206Pb/207Pb clearly highlights differences in lead origin between aerosols and deposits, revealing that aerosol samples are enriched by anthropogenic sources.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 7","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD042682","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735499","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