Atmospheric Research最新文献

{"title":"Impact of advanced cloud microphysics schemes for the Kerala flood events in 2018 and 2019 using the NCMRWF regional model","authors":"Rose Raphel, A. Jayakumar, T.J. Anurose, Saji Mohandas, Greeshma M. Mohan, M. Sandhya, Anumeha Dube, Donali Gogoi, V.S. Prasad, Claudio Sanchez","doi":"10.1016/j.atmosres.2026.109297","DOIUrl":"https://doi.org/10.1016/j.atmosres.2026.109297","url":null,"abstract":"Kerala, a tropical coastal state in southern India, experienced devastating floods during the consecutive southwest monsoons of 2018 and 2019. August 2018 witnessed widespread, large-scale flooding across Kerala, whereas the 2019 event was characterized by localized flash flooding. The current work carried out sensitivity experiments to examine the prediction of the aforementioned events using the NCMRWF regional forecasting model (NCUM-R) at convection-permitting scale. Two regional atmospheric science configurations were used: the operational RA2 configuration and the RA3 configuration, which incorporates ‘new physics’. These physics changes include a double moment microphysics scheme, namely Cloud AeroSol Interacting Microphysics (CASIM) and a bimodal (BM) cloud fraction scheme. At the synoptic scale, the westward propagating barotropic waves interact with the mean flow, and moisture convergence is evident for both flood cases, irrespective of the science configuration used in NCUM-R. ‘New physics’ gives a better/marginal skill in predicting the convective driven/large scale dynamics driven episodes of 2019/2018. The secondary Ice production process in the ‘New Physics’ exhibits a higher graupel distribution in the middle atmosphere and the associated latent heating changes supports the baroclinicity for the convective case period. Rain mass budget analysis further reveals that riming, graupel growth and depletion, and the melting of ice crystals are the dominant microphysical processes contributing to the intensified rainfall in 2019 compared with 2018. The current study utilized potential vorticity tendency (PVT) tracer analysis, focusing on the twisting term at the convective scale, to evaluate the strengths and limitations of the model's physics configurations in predicting extreme precipitation events.","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"6 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148885302","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":"Interannual-to-decadal variations of the Yangtze River Delta summer rainfall during 1901–1975 linked with North Pacific Sea surface temperature","authors":"Yanhao Peng, Dong Xiao","doi":"10.1016/j.atmosres.2026.109310","DOIUrl":"https://doi.org/10.1016/j.atmosres.2026.109310","url":null,"abstract":"Previous studies have primarily examined changes in summer precipitation over the Yangtze River Delta (YRD) since the abrupt shift in the East Asian summer monsoon (EASM) regime in 1976. However, variations in precipitation before 1976 have been less well explored due to the scarcity and discontinuity of records from the Second World War period. This study uses the Shanghai summer precipitation (SHSP) series from 1874 to 2024 to investigate these linkages. Our findings suggest that SHSP variations are representative of summer precipitation over the middle and lower reaches of the Yangtze River. Furthermore, the negative correlation between SHSP and CNPSST is primarily driven by interannual-to-decadal variability, as revealed by 15-year high-pass filtering. Negative CNPSST anomalies coincide with a negative phase of the Pacific–Japan (PJ) teleconnection, a southward subtropical jet stream, and a weakened EASM. This circulation pattern triggers anomalous ascending motion over the YRD, accompanied by lower-tropospheric convergence and upper-tropospheric divergence. This vertical circulation anomaly further promotes increased summer rainfall in the YRD. CESM LENS2 simulations largely reproduce these coupled relationships, supporting the robustness of the identified linkages.","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"43 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148885250","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":"Large-eddy simulation of subgrid-scale closure effects on the shear layer beneath nocturnal low-level jets over the southeastern Tibetan Plateau","authors":"Ziyuan Zhu, Yulong Ma, Xingwen Jiang","doi":"10.1016/j.atmosres.2026.109304","DOIUrl":"https://doi.org/10.1016/j.atmosres.2026.109304","url":null,"abstract":"Nocturnal low-level jets (LLJs) over complex terrain pose hazards to aviation and wind-energy operations. Their pronounced lower-flank shear layer plays a key role in regulating the downward extension of high-speed winds. Although large-eddy simulation (LES) is widely used to investigate LLJ dynamics, the vertical organization of subgrid-scale (SGS) momentum exchange within the lower-flank shear layer remains insufficiently understood, particularly where this layer is only partly resolved and remains sensitive to SGS closure. Here we conduct Weather Research and Forecasting large-eddy simulations (WRF-LES) over the southeastern margin of the Tibetan Plateau using two SGS closures: the dynamic and static Smagorinsky models (DSM and SSM). The simulations are evaluated against Doppler wind lidar observations. Results show that the simulated jet core and lower-flank shear layer are sensitive to SGS closure. Compared with DSM, SSM produces a broader enhancement of SGS eddy viscosity and a greater downward extension of the high-speed layer, whereas DSM exhibits a more localized response. To further examine the associated vertical momentum redistribution, we diagnose the vertical-shear contribution to the SGS momentum flux, <ce:italic>F</ce:italic><ce:inf loc=\"post\">SGS,z</ce:inf>, and its corresponding vertical diffusion tendency, <ce:italic>A</ce:italic><ce:inf loc=\"post\">SGS,z</ce:inf>. The strongest <ce:italic>A</ce:italic><ce:inf loc=\"post\">SGS,z</ce:inf> response is vertically displaced from the broader <ce:italic>K</ce:italic><ce:inf loc=\"post\"><ce:italic>m</ce:italic></ce:inf> enhancement, indicating that the vertical redistribution response cannot be inferred from eddy viscosity alone. A dedicated terrain-smoothing experiment further shows that reducing resolved terrain complexity weakens the mature-stage SSM–DSM contrasts by approximately 58–94%, depending on the diagnostic. These results indicate that SGS-closure effects remain concentrated within the LLJ lower-flank transition layer, while resolved terrain complexity substantially modulates their magnitude and vertical redistribution.","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"34 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148885299","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":"Altitude-dependent transport pathways driving nighttime ozone enhancement over an urban mountain site in Seoul","authors":"Jung-Woo Yoo, Young-Jun Kim, Soon-Hwan Lee","doi":"10.1016/j.atmosres.2026.109305","DOIUrl":"https://doi.org/10.1016/j.atmosres.2026.109305","url":null,"abstract":"Urban mountain sites can provide valuable information on elevated ozone (O<ce:inf loc=\"post\">3</ce:inf>) conditions that are difficult to capture from surface observations, yet the processes responsible for different nighttime O<ce:inf loc=\"post\">3</ce:inf> behaviors remain insufficiently understood. This study investigated nighttime-to-early-morning high O<ce:inf loc=\"post\">3</ce:inf> at Mt. Gwanak in Seoul using long-term observations (2015–2024) and WRF-CMAQ modeling. Long-term observations identified persistent and rapid-enhancement patterns among nighttime high O<ce:inf loc=\"post\">3</ce:inf> events. Of 83 daytime high O<ce:inf loc=\"post\">3</ce:inf> days at the Seoul surface, 26 days (31%) were preceded by either pattern, indicating an association with nighttime high O<ce:inf loc=\"post\">3</ce:inf> at Mt. Gwanak. Detailed analyses of two selected episodes showed a shallow nocturnal boundary layer and stable lower atmosphere, with relatively high O<ce:inf loc=\"post\">3</ce:inf> mainly above the lowered boundary layer. The net chemical contribution at Mt. Gwanak was negative in both episodes, indicating that chemical processes alone could not explain the sustained or increasing high O<ce:inf loc=\"post\">3</ce:inf>. CMAQ integrated process rate analysis revealed contrasting transport processes. The persistent episode was associated mainly with horizontal transport of O<ce:inf loc=\"post\">3</ce:inf>-rich air from the upwind region at relatively low altitudes, whereas the rapid-enhancement episode involved horizontal transport at higher altitudes together with vertical transport in the lower layer. At the Seoul surface, increased positive vertical diffusion after approximately 06 LST suggested that enhanced morning vertical mixing contributed to the surface O<ce:inf loc=\"post\">3</ce:inf> increase. These findings highlight the importance of vertical O<ce:inf loc=\"post\">3</ce:inf> structure and altitude-dependent transport in understanding nighttime high O<ce:inf loc=\"post\">3</ce:inf> at Mt. Gwanak and demonstrate the value of urban mountain observations for examining subsequent surface O<ce:inf loc=\"post\">3</ce:inf> changes.","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"49 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148885251","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":"The influence of stratospheric polar vortex shifts on winter temperatures in China: Role of the North Atlantic Oscillation","authors":"Ke Ma,Quanliang Chen,Xin Zhou,Yingying Zhong","doi":"10.1016/j.atmosres.2026.109313","DOIUrl":"https://doi.org/10.1016/j.atmosres.2026.109313","url":null,"abstract":"","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"9 1","pages":"109313"},"PeriodicalIF":5.5,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893642","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":"First validation of FY-4A PWV assimilation in improving NWP model performance for heavy precipitation forecasting","authors":"Dengxin He,Zhizhao Liu,Jiafei Xu,Guirong Xu,Anwei Lai,Yunchang Cao,Hong Liang,Guan Hong","doi":"10.1016/j.atmosres.2026.109303","DOIUrl":"https://doi.org/10.1016/j.atmosres.2026.109303","url":null,"abstract":"","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"1 1","pages":"109303"},"PeriodicalIF":5.5,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893637","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":"Elevation-dependent variations in snow cover and their response to climate and the polar vortex in the Altai mountains","authors":"Jiarui Li,Wei Zhang,Xuejiao Wu,An'an Chen,Xinyue Zhong,Yongping Shen","doi":"10.1016/j.atmosres.2026.109308","DOIUrl":"https://doi.org/10.1016/j.atmosres.2026.109308","url":null,"abstract":"","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"53 1","pages":"109308"},"PeriodicalIF":5.5,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893643","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":"Contrasting ambient environments of locally generated short- and long-lived warm-sector heavy precipitation events over the South China coast","authors":"Haisheng Liu,Xiaogang Huang,Jianfang Fei,Xiaoping Cheng,Xiadong An,Xiangrong Yang,Jing Sun,Chi Zhang","doi":"10.1016/j.atmosres.2026.109311","DOIUrl":"https://doi.org/10.1016/j.atmosres.2026.109311","url":null,"abstract":"","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"7 1","pages":"109311"},"PeriodicalIF":5.5,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893635","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":"Spring and summer sea ice anomalies synergetically enhance summer precipitation over the Indochina Peninsula","authors":"Yan Zhang,Shu Gui,Jie Cao,Ruowen Yang,Li Zhu,Lei Cai","doi":"10.1016/j.atmosres.2026.109309","DOIUrl":"https://doi.org/10.1016/j.atmosres.2026.109309","url":null,"abstract":"","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"35 1","pages":"109309"},"PeriodicalIF":5.5,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893640","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":"Classification of summer Tibetan Plateau zonal shear lines and associated precipitation mechanisms under different circulation patterns","authors":"Xiaohong Bao,Xiuping Yao,Yubin Yu","doi":"10.1016/j.atmosres.2026.109320","DOIUrl":"https://doi.org/10.1016/j.atmosres.2026.109320","url":null,"abstract":"","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"12 1","pages":"109320"},"PeriodicalIF":5.5,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893641","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}