Journal of Geophysical Research: Atmospheres最新文献_第4页

Distinct Microphysical Characteristics of Precipitating and Non-Precipitating Parts of a Stratus Cloud From In Situ Aircraft Observations 从飞机现场观测得出的层云降水和非降水部分的不同微物理特征

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-08 DOI: 10.1029/2024JD043243

Jiefeng Li, Chuanfeng Zhao, Xiaobo Dong, Rong Mai, Xin Zhao, Yikun Yang, Annan Chen

{"title":"Distinct Microphysical Characteristics of Precipitating and Non-Precipitating Parts of a Stratus Cloud From In Situ Aircraft Observations","authors":"Jiefeng Li, Chuanfeng Zhao, Xiaobo Dong, Rong Mai, Xin Zhao, Yikun Yang, Annan Chen","doi":"10.1029/2024JD043243","DOIUrl":"https://doi.org/10.1029/2024JD043243","url":null,"abstract":"Cloud microphysical properties play a crucial role in stratus cloud behavior, with notable differences between precipitating and non-precipitating parts. This study presents aircraft-based observations on 8 May 2020 over a coastal region in China, to investigate the microphysical characteristics of a liquid stratus cloud. Significant differences in aerosols number concentration (Na), cloud droplet concentration (Nc), and drizzle droplet concentration (Nd) are observed, with lower number concentrations in the precipitating part for all three. The effective radius (re) of cloud droplets is smaller, while drizzle droplets exhibit a larger re in the precipitating part. In the non-precipitating part, drizzle droplet re decreases with altitude, while in the precipitating part, it remains constant due to larger droplets falling out. Aerosol size distribution analysis implies that precipitation mainly scavenges aerosols with sizes smaller than 0.3 μm. Cloud particle size distributions are bimodal, with a broader spectrum in the precipitating part, especially in lower layers. Additionally, drizzles contribute approximately 20% to the total liquid water content in the non-precipitating part, and 70% in the precipitating part. Our findings highlight distinct differences in cloud microphysical properties of the stratus cloud between precipitating and non-precipitating parts, with drizzle playing a critical role in cloud microphysics and precipitation formation.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919863","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

Aerosol Radiation Effect Outweighs VOCs Reactivity Effect on Vertical Ozone Photochemical Features 气溶胶辐射效应大于VOCs反应性对臭氧垂直光化学特征的影响

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-08 DOI: 10.1029/2024JD042348

Zhuyi Jiang, Bin Zhu, Shuangshuang Shi, Siqi Yang, Guiqian Tang, Wen Lu, Junlin An, Chunsong Lu, Ke Li, Hong Liao

{"title":"Aerosol Radiation Effect Outweighs VOCs Reactivity Effect on Vertical Ozone Photochemical Features","authors":"Zhuyi Jiang, Bin Zhu, Shuangshuang Shi, Siqi Yang, Guiqian Tang, Wen Lu, Junlin An, Chunsong Lu, Ke Li, Hong Liao","doi":"10.1029/2024JD042348","DOIUrl":"https://doi.org/10.1029/2024JD042348","url":null,"abstract":"The proportion of more active volatile organic compounds (VOCs) species decreases with altitude, whereas radiation increases vertically due to aerosol scattering near the surface, exerting opposite effects on vertical O3 generation. Using the observation-based model (OBM) constrained by vertical profiles, we identified that the aerosol radiation effect (ARE) has a stronger impact on photochemical characteristics and O3-NOx-VOC sensitivity than the VOCs reactivity effect (VRE). ARE is the dominant factor, promoting the formation of O3 and ·OH (increases by 36.7% and 106.3%), enhancing high-altitude oxidation, and shifting parts of the VOC-limited regimes to the NOx-limited regimes (VOCs/NOx ratio decreases by 21.1%). Additionally, rapid NOx depletion with altitude leads to stronger NOx limitation aloft, amplifying ARE's effect on O3-NOx-VOC sensitivity (ratio decreases by 28.1%). These findings improve the understanding of vertical ozone generation conditions and suggest that more attention should be paid to vertical environments in surface ozone management.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919866","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

Influence of Ground-Based Microwave Radiometer Profile Assimilation on Fog Genesis Forecasts in the Winter Boundary Layer of Northern India 地基微波辐射计廓线同化对印度北部冬季边界层起雾预报的影响

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-07 DOI: 10.1029/2024JD042224

Avinash N. Parde, Sachin D. Ghude, V. S. Prasad, K. B. R. R. Hari Prasad, Narendra Gokul Dhangar, Prasanna Lonkar, R. K. Jenamani, Mrinal Biswas, Sandeep Wagh, Fei Chen, M. Rajeevan

{"title":"Influence of Ground-Based Microwave Radiometer Profile Assimilation on Fog Genesis Forecasts in the Winter Boundary Layer of Northern India","authors":"Avinash N. Parde, Sachin D. Ghude, V. S. Prasad, K. B. R. R. Hari Prasad, Narendra Gokul Dhangar, Prasanna Lonkar, R. K. Jenamani, Mrinal Biswas, Sandeep Wagh, Fei Chen, M. Rajeevan","doi":"10.1029/2024JD042224","DOIUrl":"https://doi.org/10.1029/2024JD042224","url":null,"abstract":"This study investigates the synergistic impacts of conventional and non-conventional atmospheric data assimilation (DA) and fine-gridded soil state assimilation on wintertime fog formation over the Indo-Gangetic Plain (IGP), with a specific focus on Delhi. Two DA experiments were conducted using the Weather Research and Forecasting (WRF) model: the first (DA1) assimilated temperature and humidity profiles from a microwave radiometer (MWR) using 3DVar/GSI-based system, while second (DA2) extended DA1 by incorporating fine-gridded initial soil fields from the High-Resolution Land Data Assimilation System (HRLDAS). The effectiveness of these data sets in improving the forecast accuracy of wintertime meteorological parameters within the boundary layer was evaluated. MWR profiles were validated against simultaneous radiosonde (RS) measurements during the winter seasons of 2017–2019, and bias correction using RS data was implemented to enhance MWR profile accuracy. The results indicated that the assimilation of MWR profiles (DA1) improves the accuracy of near surface temperature and humidity forecasts, conducive for fog conditions. The inclusion of soil state assimilation (DA2) further improves the representation of soil states, thereby better capturing the physical processes associated with fog formation. With DA2, biases in near-surface meteorological and soil variables were significantly reduced (50% in T2, 16% in RH2, 66% in SM, 46% in ST) compared to DA1. DA2 also improved the representation of surface fog heterogeneity and lifecycle across the IGP, with a spatial skill score of 0.36, versus 0.29 for DA1 and 0.24 without assimilation. Additionally, DA2 achieved a higher critical success index (CSI) of 0.75, compared to 0.50 for DA1.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919803","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

Scale-Dependence of Tropical Oceanic Deep Convective Systems’ Cloud Shield Morphology to Environmental Conditions 热带海洋深层对流系统云屏蔽形态对环境条件的尺度依赖性

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-07 DOI: 10.1029/2024JD042494

Rémy Roca, Thomas Fiolleau, Louis Netz

{"title":"Scale-Dependence of Tropical Oceanic Deep Convective Systems’ Cloud Shield Morphology to Environmental Conditions","authors":"Rémy Roca, Thomas Fiolleau, Louis Netz","doi":"10.1029/2024JD042494","DOIUrl":"https://doi.org/10.1029/2024JD042494","url":null,"abstract":"Deep convective systems are ubiquitous over the tropical oceans and are central to the Earth radiation budget due to their upper-level cloud shields. Possible evolution of the morphology of these cloud shields with climate change remain poorly understood. In this study, the sensitivity of the cloud shield to environmental conditions is therefore investigated using a large data set of atmospheric profiles from reanalysis and satellite observations. The initial environmental conditions in stability, thermodynamics, and dynamics are explored. Multilinear regression between morphology and environment is used in a 2D phase space linked to the life cycle of the systems, namely the time to reach the maximum area and the associated maximum area. Dynamical drivers show stronger morphological control than the thermodynamic factors. The result reveals an overwhelming role for wind shear over a deep tropospheric layer in explaining the scale dependence of cloud shield morphology. In particular, the variability of the shield growth rate is very well explained by deep layer shear (R2 > 0.8). The depth of the systems is also strongly related to dynamics and secondly to water vapor loading. These results feed the debate on the relative role of deep- versus low-level shear in influencing deep convection and extend previous precipitation-centric considerations to the cloud shield of the systems. Possible underlying mechanisms are discussed, and the need to extend previous theoretical considerations on idealized convective geometry toward the whole spectrum of deep convective systems populating the tropical oceans is emphasized.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD042494","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919802","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

Role of Autoconversion Parameterization in Coupled Climate Model for Simulating Monsoon Subseasonal Oscillations 自转换参数化在耦合气候模式模拟季风亚季节振荡中的作用

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-06 DOI: 10.1029/2024JD042783

Ushnanshu Dutta, Moumita Bhowmik, Anupam Hazra, Suryachandra A. Rao, Jen-Ping Chen

{"title":"Role of Autoconversion Parameterization in Coupled Climate Model for Simulating Monsoon Subseasonal Oscillations","authors":"Ushnanshu Dutta, Moumita Bhowmik, Anupam Hazra, Suryachandra A. Rao, Jen-Ping Chen","doi":"10.1029/2024JD042783","DOIUrl":"https://doi.org/10.1029/2024JD042783","url":null,"abstract":"The Indian summer monsoon (ISM) and associated monsoon intraseasonal oscillations (MISOs) influence the billions of people living in the Indian subcontinent. This study explores the role of autoconversion parameterization in microphysical schemes for the simulation of MISO with the coupled climate model, for example, the Climate Forecast System version 2 (CFSv2), by conducting sensitivity experiments in two resolutions (∼100 and ∼38 km). Results reveal that the modified autoconversion parameterization better simulates the active-break spells of the ISM rainfall. The main improvements include the contrasting features of rainfall over land and ocean and the MISO index, representing MISO periodicity. The improvements are qualitatively and quantitatively more significant in the higher-resolution simulations, particularly regarding rainfall spatial patterns over the Indian subcontinent during active spells. The MISO monitoring index in the revised CFSv2 also shows improvement compared with the control run. This study concludes that proper autoconversion parameterization in the coupled climate model can lead to enhanced representation of active-break spells and sub-seasonal variability of ISM.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143914587","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

Perspectives on Convective Rainfall From Passive and Active Microwave Sensors 从被动和主动微波传感器看对流降雨

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-06 DOI: 10.1029/2024JD043005

Yulan Hong, Veljko Petkovic

{"title":"Perspectives on Convective Rainfall From Passive and Active Microwave Sensors","authors":"Yulan Hong, Veljko Petkovic","doi":"10.1029/2024JD043005","DOIUrl":"https://doi.org/10.1029/2024JD043005","url":null,"abstract":"Understanding the type of rainfall is crucial for hydrological modeling, large-scale circulation simulations, and severe weather alerts. The present study offers an insight into the consistency of convective rain observations from spaceborne active (KuPR)/passive (GPM Microwave Imager [GMI]) microwave sensors and ground-based radar network (GV-MRMS). Findings over CONUS suggest a strong agreement in convective rain detection between the three products for the deep convective regime—the storms exceeding 10 km in height and characterized by low brightness temperature at ice-sensing channels. In contrast, a poor agreement occurs for shallow-broken rain systems with storm tops below 5 km. Compared to the GV-MRMS product, GMI and KuPR tend to classify shallow-broken rain as convective. Globally, at the midlatitudes, GMI recognizes less than 20% of KuPR-detected convective rain, while showing a better agreement in the tropical regions. Linear trends of GMI and KuPR convective rain, calculated for the period 2014–2023, reveal agreement in cold (ice phase present in the hydrometer column) and disagreement in warm (no ice phase present) rain cases, with −0.022 (GMI) and −0.019 (KuPR) mm day−1 decade−1 for cold and −0.010 (KuPR) and 0.002 (GMI) mm day−1 decade−1 for warm rain, respectively. Trends observed over the ITCZ in the mid and east Pacific Ocean oppose those over the west Pacific and tropical Atlantic Ocean. All variations are successfully linked to the environmental conditions, known to reflect atmospheric convective preference and offer a valuable proxy to the users.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD043005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143914585","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

Compound Extreme Events Associated With Extreme Dust Events in the Gobi Desert Shift From Extreme Dust-Extreme Cold Events to Extreme Hot-Extreme Dust Events 与极端沙尘事件相关的戈壁沙漠复合极端事件从极端沙尘-极端寒冷事件向极端热-极端沙尘事件转变

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-06 DOI: 10.1029/2025JD043325

Qingzhe Zhu, Yuzhi Liu, Rui Jia, Na Xiao

{"title":"Compound Extreme Events Associated With Extreme Dust Events in the Gobi Desert Shift From Extreme Dust-Extreme Cold Events to Extreme Hot-Extreme Dust Events","authors":"Qingzhe Zhu, Yuzhi Liu, Rui Jia, Na Xiao","doi":"10.1029/2025JD043325","DOIUrl":"https://doi.org/10.1029/2025JD043325","url":null,"abstract":"Compound extreme weather events are frequent and exhibit new features in the context of global change. This study unravels the characteristics, variations, and driving factors of compound extreme temperature-extreme dust events in the Gobi Desert (GD) during the springs of 2000–2023. The temperature in the GD is high before extreme dust events (EDEs), while that is low during EDEs. Correspondingly, extreme hot events (EHEs) occur prior to EDEs and extreme cold events (ECEs) occur during EDEs. The frequency of EHEs associated with EDEs in 2012–2023 is 100% higher than that in 2000–2011, while the frequency of ECEs associated with EDEs in 2012–2023 is 75% lower than that in 2000–2011. Accordingly, compound extreme events associated with EDEs shift from EDE-ECEs to EHE-EDEs. By strengthening East Asian anomalous high pressure, enhanced Arctic Oscillation during the pre-EDE periods and weakened Eurasian teleconnection during EDEs increases EHEs and decreases ECEs, respectively, and combined drive the shift in the compound extreme events. This study reveals a new feature of compound extreme weather events in the context of climate change, which manifests as the shift from EDE-ECEs to EHE-EDEs in the GD. The occurrence of more EHE-EDEs will put already fragile ecosystems of the GD at even greater risk. Therefore, the containment of global warming, especially in arid and semiarid regions, is necessary and urgent.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143914583","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

Morphology and Mineral Composition of Dust Particles Generated by Sandblasting From the Tengger Desert and the Ulan Buh Desert 腾格里沙漠和乌兰布和沙漠喷砂粉尘颗粒形态和矿物组成

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-06 DOI: 10.1029/2025JD043388

Long Zhang, Tafeng Hu, Feng Wu, Junji Cao, Tomoko Kojima, Daizhou Zhang

{"title":"Morphology and Mineral Composition of Dust Particles Generated by Sandblasting From the Tengger Desert and the Ulan Buh Desert","authors":"Long Zhang, Tafeng Hu, Feng Wu, Junji Cao, Tomoko Kojima, Daizhou Zhang","doi":"10.1029/2025JD043388","DOIUrl":"https://doi.org/10.1029/2025JD043388","url":null,"abstract":"The Tengger Desert (TGD) and the Ulan Buh Desert (UBD) are major sources of Asian dust. To support accurate investigations into environmental and climatic impacts of dust from these deserts, we analyzed over sixty thousand individual dust particles, generated by sandblasting from their primary surface types: Gobi soils and sand dunes. TGD particles were generally smaller, rounder, and smoother than UBD's. The Gobi soil and sand dune particles of the TGD exhibited the largest number fractions at 0.5 μm and 0.5–0.6 μm in size and those of the UBD at 0.7 and 0.6 μm, respectively. Aspect ratios were similar across particles, around 1.3 roundness varied, with TGD particles averaging 0.55 (Gobi soils) and 0.50 (sand dunes) compared to UBD particles at 0.40–0.45 (Gobi soils) and 0.45 (sand dunes). Mineral analysis revealed both deserts produced particles rich in clay minerals, quartz, and other silicate particles. TGD particles contained more kaolinite and quartz, whereas UBD particles had higher chlorite and other silicates. Gypsum and halite were identified in 3.13% and 3.63% of UBD Gobi particles, respectively, indicating salt abundance in some particles; but these two salts were rarely detected in TGD particles. Comparison with data from the Taklamakan Desert revealed distinctive differences in morphology, mineral composition, and salt content. These results provide detailed source-region profiles of Asian dust particles, allowing a better involvement of nascent dust particles in field studies and numerical simulations to study their variability and roles in atmospheric chemistry and radiation transfer.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143914584","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 Role of Tropical Synoptic-Scale Disturbances in Modulating the Strength of East Pacific Hadley Circulation 热带天气尺度扰动在调制东太平洋哈德利环流强度中的作用

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-06 DOI: 10.1029/2024JD042980

Pratiksha P. Baruah, J. M. Neena, E. Suhas

{"title":"The Role of Tropical Synoptic-Scale Disturbances in Modulating the Strength of East Pacific Hadley Circulation","authors":"Pratiksha P. Baruah, J. M. Neena, E. Suhas","doi":"10.1029/2024JD042980","DOIUrl":"https://doi.org/10.1029/2024JD042980","url":null,"abstract":"The east Pacific (EP), dominated by synoptic scale convective activity, presents a unique environment to explore the question of how synoptic scale disturbances can modulate the strength of mean meridional circulation. The role of mixed Rossby-Gravity (MRG) waves in modulating the east Pacific Hadley circulation (EPHC) strength is explored during boreal summer season using ERA5 reanalysis data. Composite analysis of MRG activity for five strong and five weak EPHC seasons identified based on a mass stream function based metric reveal that strong EPHC seasons are associated with pronounced MRG activity, whereas the MRG activity is weak during weak EPHC seasons. Although the sea surface temperature (SST) background state over EP is not favorable for thermally driven deep convection, low-level convergence induced by synoptic scale disturbances such as the MRG waves can trigger deep convection over the region, and in turn influence the EPHC strength. The question of whether boundary forced convergence can have an impact on the EPHC strength is further investigated using an atmospheric mixed layer model. Surface convergence driven by meridional SST gradients are not found to be significantly different during strong and weak EPHC seasons, implying the dominant role of MRG in modulating the strength of EPHC. The study also reveals a new possible mechanism via which the El Niño Southern Oscillation (ENSO) influences the strength of EPHC—ENSO induced changes in the mean background state modulates the spatio-temporal characteristics of MRG waves which in turn affect the low-level convergence over the region and impacts the strength of EPHC.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143914586","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

Highlighting the Impact of Anthropogenic OCS Emissions on the Stratospheric Sulfur Budget With In Situ Observations 利用原位观测强调人为OCS排放对平流层硫收支的影响

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-05-06 DOI: 10.1029/2024JD042588

Colin Gurganus, Andrew Rollins, Eleanor Waxman, Laura L. Pan, Warren P. Smith, Rei Ueyama, Wuhu Feng, Martyn P. Chipperfield, Elliot L. Atlas, Joshua P. Schwarz, Samantha DeLone, Troy Thornberry

{"title":"Highlighting the Impact of Anthropogenic OCS Emissions on the Stratospheric Sulfur Budget With In Situ Observations","authors":"Colin Gurganus, Andrew Rollins, Eleanor Waxman, Laura L. Pan, Warren P. Smith, Rei Ueyama, Wuhu Feng, Martyn P. Chipperfield, Elliot L. Atlas, Joshua P. Schwarz, Samantha DeLone, Troy Thornberry","doi":"10.1029/2024JD042588","DOIUrl":"https://doi.org/10.1029/2024JD042588","url":null,"abstract":"Carbonyl sulfide (OCS) is an important atmospheric sulfur species that plays a dominant role in the formation of (nonvolcanic) stratospheric sulfate aerosol in the middle stratosphere. Major uncertainties in surface sources and sinks and inconsistent model representation of vertical transport limit understanding of OCS distribution, particularly in the sparsely sampled upper atmosphere. During the 2022 Asian Summer Monsoon Chemical and CLimate Impact Project (ACCLIP) campaign, in situ measurements of OCS in the Upper Troposphere and Lower Stratosphere (UTLS) at the eastern edge of the Asian summer monsoon anticyclone (ASM), showed significant OCS enhancements (>750 ppt) near the tropopause from convectively influenced air parcels. Here, we compare these novel Asian UTLS measurements with long-term satellite observations and regional measurements to broaden understanding of OCS trends and its transport by the ASM. Trajectory analysis identifies northern China as the main source region for deep convective lofting of OCS-enriched parcels and demonstrates ASM entrainment in the UTLS, allowing evaluation of global model predictions for OCS's stratospheric influence. The ACCLIP data set provides vital in situ validation of limited vertically resolved OCS data in a region of significant anthropogenic emissions, which serves to enhance our understanding of the global sulfur budget.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD042588","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143914588","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