Journal of Geophysical Research: Atmospheres最新文献

{"title":"Insights Into the Influence of Anthropogenic Emissions on the Formation of Secondary Organic Aerosols Based on Online Measurements","authors":"Yanan Yi,&nbsp;Rui Li,&nbsp;Kun Zhang,&nbsp;Xudong Yang,&nbsp;Qing Li,&nbsp;Chunmei Geng,&nbsp;Hui Chen,&nbsp;Wen Yang,&nbsp;Jian Zhen Yu,&nbsp;Li Li","doi":"10.1029/2024JD041479","DOIUrl":"https://doi.org/10.1029/2024JD041479","url":null,"abstract":"<p>To investigate the combined impacts of anthropogenic and biogenic emissions on the formation of secondary organic aerosols (SOA), SOA molecular tracers, their corresponding volatile organic compound precursors, and other air pollutants were measured online during the winter and summer seasons of 2022 in an industrial city, Zibo, China. The results indicate that the average concentrations of SOA tracers were 16.1 ± 9.8 ng m⁻³ in winter and 99.4 ± 57.2 ng m⁻³ in summer. During winter, anthropogenic SOA (ASOA, the sum of SOA derived from naphthalene and mono-aromatic volatile organic compounds) dominated, whereas isoprene SOA (SOA_I) prevailed in summer. Correlation analysis between SO₄²⁻ and both SOA_I and high-order monoterpene SOA tracers (SOA_M-H) (<i>R</i> = 0.46–0.72, <i>p</i> &lt; 0.001) revealed that higher aerosol acidity facilitated the formation of SOA_I and SOA_M-H, with SO₂ emissions playing a significant role in leading to higher acidity. Most biogenic SOA (BSOA) tracers exhibited a significant positive correlation with NO₃⁻, particularly in winter, implying the remarkable influence of NO_<i>x</i> emissions on BSOA formation. The levels of BSOA tracers increased with NH₃, indicating that NH₃ can enhance the formation of BSOA. In summer, SOA formation correlated with O_<i>x</i> (O_<i>x</i> = O₃ + NO₂), indicating the substantial impact of atmospheric oxidizing capacity on SOA formation. During winter, aerosol liquid water content (ALWC) correlated well with SOA_I tracers (i.e., 3-hydroxyglutaric acid (3-HGA) and 3-hydroxy-4,4-dimethylglutaric acid (3-HDMGA)), and 2,3-dihydroxy-4-oxopentanoic acid (DHOPA) (<i>R</i> &gt; 0.5, <i>p</i> &lt; 0.001), indicating the important contribution of aqueous-phase formation of SOA. These findings underscore the significant role of anthropogenic pollutant emissions in the formation of ASOA and BSOA in urban environments.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD041479","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142170033","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}

{"title":"Using Satellite Observations of Lightning and Precipitation to Diagnose the Behavior of Deep Convection in Tropical Cyclones Traversing the Midlatitudes","authors":"Lena Heuscher,&nbsp;Patrick Gatlin,&nbsp;Walter A. Petersen","doi":"10.1029/2023JD040227","DOIUrl":"https://doi.org/10.1029/2023JD040227","url":null,"abstract":"<p>This study uses a unique combination of geostationary and low-Earth orbiting satellite-based lightning and precipitation observations, respectively, to examine the evolution of deep convection during the tropical cyclone (TC) lifecycle. The study spans the 2018–2021 Atlantic Basin hurricane seasons and is unique as it provides the first known analysis of total lightning (intra-cloud and cloud-to-ground) observed in TCs through their extratropical transition and post-tropical cyclone (PTC) phases. We consider the TC lifecycle stage, geographic location (e.g., land, coast, and ocean), shear strength, and quadrant relative to the storm motion and environmental shear vectors. Total lightning maxima are found in the forward right quadrant relative to storm motion and downshear of the TC center, consistent with previous studies using mainly cloud-to-ground lightning. Increasing environmental shear focuses the lightning maxima to the downshear right quadrant with respect to the shear vector in tropical storm phases. Vertical profiles of radar reflectivity from the Global Precipitation Measurement mission show that super-electrically active convective precipitation features (&gt;75 flashes) within the PTC phase of TCs have deeper mixed phase depths and higher reflectivity at −10°C than other phases, indicating the presence of more intense convection. Differences in the net convective behavior observed throughout TC evolution manifest in both the TC-scale frequency of lightning-producing cells and the intensity variations amongst individual convective cells. The combination of continuous lightning observations and precipitation snapshots improves our understanding of convective-scale processes in TCs, especially in PTC phases, as they traverse the tropics and mid-latitudes.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JD040227","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142170065","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}

{"title":"Role of Organic Vapor Precursors in Secondary Organic Aerosol Formation: Concurrent Observations of IVOCs and VOCs in Guangzhou","authors":"Mengxue Tong,&nbsp;Yanli Zhang,&nbsp;Shaoxuan Xiao,&nbsp;Chenglei Pei,&nbsp;Jun Wang,&nbsp;Runqi Zhang,&nbsp;Xiaoqing Huang,&nbsp;Wei Song,&nbsp;Xinming Wang","doi":"10.1029/2024JD041018","DOIUrl":"https://doi.org/10.1029/2024JD041018","url":null,"abstract":"<p>Secondary organic aerosol (SOA) formed through the atmospheric transformation of organic vapors constitutes a significant portion of fine particulate matter or PM_2.5. While recent laboratory studies underscore the importance of intermediate-volatility organic compounds (IVOCs) as key precursors to SOA, field observations that recognize the role of both volatile organic compounds (VOCs) and IVOCs in SOA formation remain scarce. In this study, we conducted concurrent measurements of VOCs and IVOCs in ambient air at urban and suburban sites in Guangzhou during a PM_2.5 pollution event in winter 2021. The results reveal that between 12:00–15:00 local time, the photochemically adjusted initial concentrations of VOCs at both sites were approximately 7 times higher than that of IVOCs. However, the SOA formation potential (SOAFP) of primary hydrocarbon IVOCs exceeded that of VOCs by over 3–4 times. Receptor modeling results further indicated that while ship emissions contributed to less than 10% of the C2–C22 primary hydrocarbons concentration (VOCs + primary carbonaceous IVOCs), they accounted for the most significant source (approximately 40%) of SOA formation. This study highlights the substantial role of IVOCs in SOA formation and emphasizes the importance of future PM_2.5 pollution control measures targeting major IVOCs contributors, such as ship emissions in harbor cities.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142170088","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}

{"title":"Importance of Intraseasonal Oscillation for the Regional Extreme Consecutive dry Days Events in Spring Over Southern China","authors":"Zixuan Zeng,&nbsp;Jianqi Sun,&nbsp;Shengping He","doi":"10.1029/2024JD041498","DOIUrl":"https://doi.org/10.1029/2024JD041498","url":null,"abstract":"<p>This study investigates the influences of intraseasonal oscillation on two types of regional extreme consecutive dry days events (RECDD) in spring over Southern China (SC). For type-1 RECDD occurring in entire SC, the 7–25 days and 25–90 days high over Lake Balkhash-Baikal are important. The 7–25 days high first causes lower-tropospheric northerlies and moisture deficit in SC, then propagates to Yangtze River Basin and causes lower-tropospheric warming and decaying moisture deficit in SC. These processes favor dry condition in SC for 1 week. In comparison, the 25–90 days high and associated lower-tropospheric warming and moisture deficit in SC favor dry condition there for more than one week. For type-2 RECDD occurring in the southern part of SC, the 7–25 days and 25–90 days high over Northeast Asia are important. The 7–25 days high contributes for one week. It first causes lower-tropospheric anticyclone around the East China Sea and south-negative–north-positive moisture pattern in SC, then propagates to the Sea of Japan and causes lower-tropospheric south-warming–north-cooling pattern and decaying south-negative–north-positive moisture pattern in SC. In comparison, the 25–90 days high and associated lower-tropospheric south-warming–north-cooling pattern and south-negative–north-positive moisture pattern in SC favor south-dry–north-wet pattern there for more than one week. Moreover, the 7–25 days low and decaying 25–90 days high over Lake Balkhash-Baikal, concurring with 7–25 days low over Bay of Bengal, favor the end of type-1 RECDD; the 7–25 days low and decaying 25–90 days high over Northeast Asia favor the end of type-2 RECDD.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142165253","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}

{"title":"Impacts of Anthropogenic Emissions and Open Biomass Burning in South Asia and Southeast Asia on Air Quality and Meteorology Over Southern China","authors":"Dongpu Li,&nbsp;Hongli Liu,&nbsp;Jianbao Liu,&nbsp;Jing Li,&nbsp;Kaicun Wang","doi":"10.1029/2024JD041267","DOIUrl":"https://doi.org/10.1029/2024JD041267","url":null,"abstract":"<p>The emissions from South Asia and Southeast Asia significantly impact air quality and meteorological conditions in China. However, the individual or joint contributions of anthropogenic emissions and/or biomass burning from outside China to surface particulate matter with aerodynamic diameters less than 2.5 μm (PM_2.5) and aerosol optical depth (AOD) over southern China have not been fully investigated. Here, five experiments were designed to investigate the impacts of these emissions in January (winter), March (pre-monsoon), and October (post-monsoon) for 2017. Aerosols from South Asia and Southeast Asia contributed less to southern China during winter and post-monsoon seasons, whereas the wind patterns and emission intensity during the pre-monsoon season were conducive to the transport of aerosols. During pre-monsoon season, the total emissions contributed approximately 5.0 μg m⁻³ to surface PM_2.5 in Xizang Province. Biomass burning in Southeast Asia increased PM_2.5 in Yunnan Province by 37.9 μg m⁻³, while anthropogenic emissions increased it by 8.9 μg m⁻³. Transboundary aerosols can be transported to Xizang Province and Yunnan Province, primarily influencing PM_2.5 below 2 km height. It mainly affected PM_2.5 levels above the planetary boundary layer over southeast China. Aerosols from outside China can account for 79.5% and 54.8% AOD in Yunnan Province and southeast China, respectively. These aerosols reduced surface incident solar radiation by approximately 6%, leading to decreases in air temperature, wind speed, and boundary layer height. The findings are only applicable to the pre-monsoon season.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142165222","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}

{"title":"What Controls the Interdecadal Enhancement in Interannual Variability of Summertime Intraseasonal Precipitation Over South China?","authors":"Wei Lu,&nbsp;Yao Ha,&nbsp;Yimin Zhu,&nbsp;Yijia Hu,&nbsp;Yudi Liu,&nbsp;Zhong Zhong","doi":"10.1029/2024JD041214","DOIUrl":"https://doi.org/10.1029/2024JD041214","url":null,"abstract":"<p>This study focuses on the interannual variability of summertime intraseasonal precipitation intensity (SIPI) over South China (SC) in the 30–90-day range. The results demonstrate a significant increase in the interannual variability of SIPI over SC around the mid-1990s. By comparing atmospheric and oceanic anomalies between two periods, P1 (1984–1993) and P2 (1994–2003), we identify that both the Silk Road pattern (SRP) and the western Pacific subtropical high (WPSH) play a role in influencing this interdecadal increase in SIPI interannual variability. These system anomalies are modulated by sea surface temperature anomalies (SSTA) in the North Atlantic (NA) and equatorial East Pacific (EP). During years with positive precipitation anomalies in P2, warming EP SSTA induces anomalous Walker cell and local Hadley cell, weakening the WPSH and enhancing convective activity, and increasing moisture transport over SC. The warming NA SSTA near 45°N triggers a more southerly propagation of SRP, thereby providing additional disturbance energy that enhances summer precipitation over SC. Conversely, during years with negative precipitation anomalies in P2, these processes occur in reverse. The enhanced interannual variability of local convective activity from P1 to P2 leads to a corresponding increase in the interannual variability of the WPSH, which, coupled with an amplified interannual variability of SRP, results in heightened interannual variability of SIPI. Additionally, the composite analysis of 30–90-day ISO events further substantiates the underlying mechanisms driving the interdecadal amplification of SIPI interannual variability. Diagnostic results reveal that the 30–90-day horizontal wind induces heightened convergence of background moisture over SC.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD041214","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142165221","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}

{"title":"Using the NAMA as a Natural Integrator to Quantify the Convective Contribution to Lower Stratospheric Water Vapor Over North America","authors":"David S. Sayres,&nbsp;Jessica B. Smith,&nbsp;David M. Wilmouth,&nbsp;Apoorva Pandey,&nbsp;Cameron R. Homeyer,&nbsp;Kenneth P. Bowman,&nbsp;James G. Anderson","doi":"10.1029/2024JD041641","DOIUrl":"https://doi.org/10.1029/2024JD041641","url":null,"abstract":"<p>The dynamical environment of the stratosphere, during the summer over North America, provides a natural integrator of the impact of convection in the lower stratosphere, as air can be confined for periods of a few days to more than a week. In situ data obtained during the NASA Dynamics and Chemistry of the Summer Stratosphere (DCOTSS) field campaign show increasing water vapor mixing ratios in background air as a function of time the air parcel spent within the North American Monsoon Anticyclone region. We find that water vapor added to the stratosphere by convection decreases with altitude and tends to drop below detectable limits by the 415 K isentrope in 2021 and the 430 K isentrope in 2022. Integrating between potential temperatures of 380 and 460 K we find that convection added between 20 and 32 Tg per summer to the stratosphere in 2021 and 2022. While the total amount is only 1%–4% of the amount ascending in the tropics across the tropical tropopause, small changes in the annual flux of water can have a significant effect on the radiation budget of the atmosphere. Locally, over North America we find that convection increased the water vapor mixing ratio at 380 K by as much as 40%. Tropopause-penetrating convection is part of the yearly cycle of stratospheric water vapor and we suggest that it must be included in extratropical models to accurately predict future trends in stratospheric water vapor.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142165220","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}

{"title":"Characteristics of Precipitation and Mesoscale Convective Systems Over the Peruvian Central Andes in Multi 5-Year Convection-Permitting Simulations","authors":"Yongjie Huang,&nbsp;Ming Xue,&nbsp;Xiao-Ming Hu,&nbsp;Elinor Martin,&nbsp;Hector Mayol Novoa,&nbsp;Renee A. McPherson,&nbsp;Changhai Liu,&nbsp;Kyoko Ikeda,&nbsp;Roy Rasmussen,&nbsp;Andreas F. Prein,&nbsp;Andres Vitaliano Perez,&nbsp;Isaac Yanqui Morales,&nbsp;José Luis Ticona Jara,&nbsp;Auria Julieta Flores Luna","doi":"10.1029/2023JD040394","DOIUrl":"https://doi.org/10.1029/2023JD040394","url":null,"abstract":"<p>Using the Weather Research and Forecasting model with two planetary boundary layer schemes, ACM2 and MYNN, convection-permitting model (CPM) regional climate simulations were conducted for a 6-year period, including a one-year spin-up period, at a 15-km grid spacing covering entire South America and a nested convection-permitting 3-km grid spacing covering the Peruvian central Andes region. These two CPM simulations along with a 4-km simulation covering South America produced by National Center for Atmospheric Research (NCAR), three gridded precipitation products, and rain gauge data in Peru and Brazil, are used to document the characteristics of precipitation and mesoscale convective systems (MCSs) in the Peruvian central Andes region. Results show that all km-scale simulations generally capture the spatiotemporal patterns of precipitation and MCSs at both seasonal and diurnal scales, although biases exist in aspects such as precipitation intensity and MCS frequency, size, propagation speed, and associated precipitation intensity. The 3-km simulation using MYNN scheme generally outperforms the other simulations in capturing seasonal and diurnal precipitation over the mountain, while both it and the 4-km simulation demonstrate superior performance in the western Amazon Basin, based on the comparison to the gridded precipitation products and gauge data. Dynamic factors, primarily low-level jet and terrain-induced uplift, are the key drivers for precipitation and MCS genesis along the east slope of the Andes, while thermodynamic factors control the precipitation and MCS activity in the western Amazon Basin and over elevated mountainous regions. The study suggests model improvements and better model configurations for future regional climate projections.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142152178","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}

{"title":"Pacific Interannual and Multidecadal Variability Recorded in δ18O of South American Summer Monsoon Precipitation","authors":"R. Orrison,&nbsp;M. Vuille,&nbsp;J. C. Rodrigues,&nbsp;N. M. Stríkis,&nbsp;F. Cruz,&nbsp;M. Rodriguez-Caton,&nbsp;L. Andreu-Hayles","doi":"10.1029/2024JD040999","DOIUrl":"https://doi.org/10.1029/2024JD040999","url":null,"abstract":"<p>The South American summer monsoon (SASM) generates important hydroclimatic impacts in (sub-)tropical South America and isotopic tracers recorded in paleoclimatic archives allow for assessing its long-term response to Pacific variability prior to modern observations. Stable oxygen isotopes in precipitation integrate hydroclimatic changes during the SASM mature phase from December to February (DJF) in response to the Interdecadal Pacific Oscillation (IPO) and El Niño—Southern Oscillation (ENSO), respectively. Here, results from the isotope-enabled Community Atmosphere Model v.5 are compared with highly resolved and precisely dated isotopic records from speleothems, tree rings, lake and ice cores during the industrial era (1880–2000 CE) and validated against observations from the International Atomic Energy Agency (IAEA) network. Pacific sea surface temperatures (SSTs) are coupled to the isotopic composition of SASM precipitation through perturbations in the Walker circulation associated with low- (IPO) and high-frequency (ENSO) variability, impacting convective activity over tropical South America and the tropical Atlantic. Changes in convection over this monsoon entrance region ultimately control the downstream oxygen isotopic composition of precipitation recorded in paleoclimate archives. Overall, model results, paleoclimate records and IAEA data agree on the isotopic response to Pacific SST forcing. These results highlight the potential for long isotopic paleoclimate records to reconstruct Pacific climate variability on both high- and low-frequency timescales. Furthermore, the isolation of the IPO signal in a diverse set of isotopic archives invites the reinterpretation of other paleoclimate proxies for identifying this historically overlooked forcing.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD040999","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142152176","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}

{"title":"Submicron Organic Aerosol Types in the Summertime Arctic: Mixing State, Geographic Distribution, and Drivers","authors":"Bojiang Su,&nbsp;Guohua Zhang,&nbsp;Congbo Song,&nbsp;Yue Liang,&nbsp;Longqun Wang,&nbsp;Lei Li,&nbsp;Zhen Zhou,&nbsp;Jinpei Yan,&nbsp;Xinming Wang,&nbsp;Xinhui Bi","doi":"10.1029/2024JD041061","DOIUrl":"https://doi.org/10.1029/2024JD041061","url":null,"abstract":"<p>During the 2017 summertime Arctic cruise observation campaigns, we measured over 290,000 individual submicron particles and clustered them into two inorganic classes (dominated by sea salt, accounting for 38.6% by number fraction) and five organic classes (dominated by natural and anthropogenic organics, 61.4%), presenting a distinct difference in geographic distribution. In the high Arctic and marginal ice zone (81.1–84.6°N) compared with the low Arctic (Chukchi Sea, Svalbard, and Iceland, &lt;80°N), ocean-derived organic aerosols were more prevalent (73.6% vs. 37.1%). Specifically, we found sharp contrasts in the geographic distributions of OC-Ca (organics internally mixed with calcium, 29.0% vs. 9.4%) and OC-S (organics internally mixed with sulfate, 3.2% vs. 21.4%). Utilizing an explainable machine learning technique, we inferred that OC-Ca was driven by wind-blown sea ice and/or sea ice floes and/or bubble bursting within sea ice leads under low wind speed conditions in the high Arctic, while OC-S tended to associate with elemental carbon, sulfate, and higher temperatures, potentially originating from combustion emissions at low latitude regions.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142152190","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}