Atmospheric Research最新文献

{"title":"The role of vertical grid resolution and turbulent diffusion uncertainty on chemical transport modeling","authors":"Lei Jiang ,&nbsp;Bertrand Bessagnet ,&nbsp;Frédérik Meleux ,&nbsp;Florian Couvidat ,&nbsp;Frédéric Tognet ,&nbsp;Jianlin Hu","doi":"10.1016/j.atmosres.2024.107759","DOIUrl":"10.1016/j.atmosres.2024.107759","url":null,"abstract":"<div><div>Chemical transport models (CTM) tend to perform poorly in simulating pollution processes under weak turbulent diffusion conditions. In this study, we address this issue from the perspectives of vertical grid resolution and vertical mixing schemes. Three vertical grid resolution configurations (L4, L12, L40) with the CHIMERE model are evaluated during a winter episode, which includes a heavy pollution episode (PE) in the Paris region. The results emphasize the significance of vertical grid resolution, particularly noticeable during nighttime, and consequently impacts CHIMERE simulations under nocturnal stable conditions. Consistent improvement in CTM modeling is observed with refined vertical resolutions and the first layer height based on a simple linear vertical diffusion scheme defined as the initial <em>Kz</em> diffusion (IKD) scheme. Compared to the other two configurations, the finest configuration (referred to as L4-IKD) demonstrates an average improvement in root mean square error of 23.26 % and 25.09 % on regular days (RD) and 62 % and 129 % during PE, respectively. However, simulations using the 1.5-order turbulence kinetic energy (TKE) based eddy diffusivity closure scheme, named the new eddy diffusion (NED), are more sensitive to the first layer height setup. Excessively fine first-layer heights can lead to inaccurate TKE calculations. Generally, models with low vertical grid resolution can reasonably predict air quality on RD or during light pollution events but struggle with heavy PEs. One straightforward enhancement strategy involves adding an extra fine first layer height in CTM simulations, resulting in an average 50.10 % improvement from L4-IKD to L12-IKD during PE. Another strategy is enhancing the model's vertical diffusion scheme, which improved the CTM modeling by 26.67 % compared with IKD during PE under identical vertical grid resolution.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"312 ","pages":"Article 107759"},"PeriodicalIF":4.5,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637429","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":"Revitalizing temperature records: A novel framework towards continuous data reconstruction using univariate and multivariate imputation techniques","authors":"Hanumapura Kumaraswamy Yashas Kumar,&nbsp;Kumble Varija","doi":"10.1016/j.atmosres.2024.107754","DOIUrl":"10.1016/j.atmosres.2024.107754","url":null,"abstract":"<div><div>Data gaps are a recurring challenge in climate research, hindering effective time series analysis and modeling. This study proposes a novel two-step data imputation framework to address temperature time series with a long continuous gap surrounded by predictor stations with sporadic missingness. The method leverages iterative gap-filling Singular Spectrum Analysis (SSA) for the small sporadic gaps, followed by multivariate techniques like Inverse Distance Weightage (IDW), Kriging, Spatial Regression Test (SRT), Point Estimation method of Biased Sentinel Hospital-based Area Disease Estimation (P-BSHADE), Random Forest (RF), Support Vector Machines (SVM), and MissForest (MF) for the longer gap. Once the sporadic gaps are effectively addressed with SSA, the method carefully applies multivariate techniques to impute the long continuous gap. Prioritizing accuracy, comprehensive cross-validation with class-based statistical indicators are employed to minimize any potential biases introduced by the imputation process. The study shows the effectiveness of SSA in filling small sporadic gaps using an optimal window length (M ≈ 365 days) and eigentriple grouping (ET = 30). Notably, for maximum temperature, P-BSHADE and SVM achieve an impressive accuracy (e.g., Legates's Coefficient of Efficiency (LCE), 0.75∼0.44, Combined Performance Index (CPI), 6.3%∼19.1%) attributed to their ability to capture spatial and/or temporal heterogeneity. While SRT and P-BSHADE offers acceptable performance for minimum temperature (e.g., LCE, 0.51∼0.27, CPI, 0.7%∼23.7%), the study also uncovers a complex interplay between missing data, predictor stations, and autocorrelation affecting imputation accuracy. This suggests that the reduced performance of certain techniques likely stems from the decline in spatial and spatiotemporal autocorrelation between the target station and its predictors. Overall, this study presents a promising framework for handling complex missing data scenarios often encountered in climate time series analysis, paving the way for more robust and reliable analysis and modeling.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"312 ","pages":"Article 107754"},"PeriodicalIF":4.5,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593541","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":"Aircraft observation of aerosol and mixed-phase cloud microphysical over the North China Plain, China: Vertical distribution, size distribution, and effects of cloud seeding in two-layered clouds","authors":"Zihan Wang ,&nbsp;Honglei Wang ,&nbsp;Xiaobo Dong ,&nbsp;Yang Yang ,&nbsp;Yue Ke ,&nbsp;Sihan Liu ,&nbsp;Yi Cui ,&nbsp;Kun Cui ,&nbsp;Zihao Wu ,&nbsp;Wen Lin","doi":"10.1016/j.atmosres.2024.107758","DOIUrl":"10.1016/j.atmosres.2024.107758","url":null,"abstract":"<div><div>Aerosol and clouds are essential to climate effects. Based on an aircraft observation in a mixed-phase cloud in Shijiazhuang, China, on November 21, 2020, analyzing the vertical and size distributions of cloud droplets, and ice crystal particles, and the effects of the similar to a “seeder-feeder” process after cloud seeding on cloud microphysics. The first seeding cloud (CS1) and second seeding cloud (CS2) were at 2600–2800 m and 1500–2300 m, respectively. Before seeding, the average number concentration of cloud droplets (Nc) was 236.91 cm⁻³ and 152.13 cm⁻³ in CS1 and CS2 from vertical observation. In CS1, the average number concentration of ice crystals (Ni) was 0.26 L⁻¹ with dendritic ice crystals and graupel, while in CS2, the average Ni was 0.19 L⁻¹, including rimed plate ice crystals, graupel, and needle ice crystals. After seeding, the average Nc decreased from 322.90 to 260.69 cm⁻³ and the spectrum of Nc broadened from 2.5 to 24 to 45 μm in CS1. The ice microphysics also had different responses in the layered cloud. Ni increased by 421 times in regions with high Nc and low LWC (Nc &gt; 322.90 cm⁻³, LWC &lt; 0.14 g∙m⁻³), including spoked and heavily rimed ice crystals and graupel (200–500 μm) in CS1. In CS2, the maximum Ni was 252.03 L⁻¹ and the average Ni increased by 2 magnitudes (from 0.39 to 11.44 L⁻¹). There were rimed needles and columnar ice crystals (200–300 μm) in regions with high Nc and high LWC (Nc &gt; 92.78 cm⁻³, LWC &gt; 0.13 g∙m⁻³), and high Nc and low LWC (Nc &gt; 92.78 cm⁻³, LWC &lt; 0.13 g∙m⁻³). Seeding in CS1 and CS2 formed a structure similar to the “seeder-feeder” process. Controlled by the downdraft (&gt;1 m/s), these particles descended into the “feeder” region of CS2. Appropriate temperature and rimed crystals contributed to secondary ice crystal production (SIP), resulting in main columns (200–300 μm) observed in CS2. The “feeder” region generated more ice crystals than the “seeder” region.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"312 ","pages":"Article 107758"},"PeriodicalIF":4.5,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637428","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":"Effects of horizontal resolution and updated surface data on simulated low-level winds for the aviation safety over Incheon International Airport","authors":"Hyeon-Ji Lee ,&nbsp;Hyeyum Hailey Shin ,&nbsp;Kyo-Sun Sunny Lim ,&nbsp;Sang-Hun Park","doi":"10.1016/j.atmosres.2024.107753","DOIUrl":"10.1016/j.atmosres.2024.107753","url":null,"abstract":"<div><div>This study aimed to alleviate the overestimation of low-level wind speeds at Incheon International Airport in South Korea by employing large eddy simulation (LES) modeling and high-resolution surface data. Simulation and observation data from two days on which potentially hazardous weather conditions near the airport were observed were selected for analysis: 12 August 2020, when strong winds were recorded, and 13 July 2020, when precipitation occurred. To investigate the impact of the horizontal resolution of the model and updated land surface data on low-level wind simulations, this study compared the simulation results of 1 km experiments with both 30-s United States Geological Survey topography and land use data and high-resolution 3-s surface data, including Shuttle Radar Topography Mission digital elevation model topography data and land use data generated by the Korean Ministry of Environment, and 100 m LES experiments with the high-resolution surface data. The observed 10-m wind speed and sonde data near the airport were used to evaluate the model results. Utilizing the updated high-resolution surface data in the 1 km model grid-spacing simulation led to a lower root mean square error and wind speed bias compared to the use of low-resolution surface data. The 100 m experiment incorporating LES modeling with the updated high-resolution surface data further improved the low-level wind simulation results compared to the 1 km experiment using the same high-resolution surface data. In addition to providing more accurate simulations of mean winds, turbulence variations over the airport and the nearby region are better resolved by using high-resolution LES modeling and combined with updated surface data, which are critical for ensuring aviation safety near the airport.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"312 ","pages":"Article 107753"},"PeriodicalIF":4.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593543","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":"Unveiling the dynamics of shallow fronts in Australia during Southerly Buster episodes (1994–2020)","authors":"Gotzon Gangoiti ,&nbsp;Eduardo Torre-Pascual,&nbsp;Ana Rodríguez-García,&nbsp;Estíbaliz Sáez de Cámara,&nbsp;María Carmen Gómez,&nbsp;Maite de Blas,&nbsp;José Antonio García,&nbsp;Estíbaliz García-Ruiz,&nbsp;Iñaki Zuazo","doi":"10.1016/j.atmosres.2024.107751","DOIUrl":"10.1016/j.atmosres.2024.107751","url":null,"abstract":"<div><div>A Frontal Identification System (FIS), initially designed to track Galernas in the Bay of Biscay, has been adapted to monitor cold fronts across Australia using wind shifts derived from ERA5 hourly reanalysis data. This high-resolution system tracks shallow, cloud-free fronts during the warm season, which can trigger bushfires, dust storms, extreme heat, and coastal weather extremes like Southerly Busters (SB) on the east coast. SB episodes, marked by sudden, squally south winds, pose hazards for boating and aviation. Our analysis of 35 SB events from 1994 to 2020 indicates that SBs originate from frontogenesis in Bass Strait (40 %) or from prefrontal troughs crossing the strait (60 %). Preceding synoptic conditions involve a Southern Ocean cold front driving cool maritime winds into the Australian thermal low, creating shallow convergence fronts (∼1000 m deep) facing warm continental winds. Onshore acceleration into the thermal low sharpens these new fronts (Type 2 fronts of the southern coast) and weakens the trailing primary ocean front, which may disappear due to high-pressure wave propagation, cold advection, and subsidence over the sea. These fronts can penetrate deep inland (Central Australian fronts) and initiate SBs on the southeast coast after interacting with the Great Dividing Range. All 35 SB events show active shallow front frontogenesis/frontolysis affecting the southern coast and inland regions. Upper-level reversed pressure gradients between the thermal low over the continent and the ocean depression maintain a wind shear region over the shallow inland cold advection. Intense warm north-westerlies south of the surface front, with wind speeds of 35–50 m s⁻¹ between 700 and 550 hPa, contribute to mesofront formation preceding SB episodes. This jet also sustains strong cross-mountain winds over the Great Dividing Range, causing the lee trough at the coastal strip that precedes all SB episodes on the eastern coast. Understanding these dynamics can help predict and manage these events more effectively.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"312 ","pages":"Article 107751"},"PeriodicalIF":4.5,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572131","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":"Interdecadal variability in the dominant synoptic patterns responsible for the summer daily extreme precipitation over the Tarim Basin, Northwest China","authors":"Lianglu Qu ,&nbsp;Yong Zhao ,&nbsp;Junqiang Yao ,&nbsp;Lixia Meng","doi":"10.1016/j.atmosres.2024.107746","DOIUrl":"10.1016/j.atmosres.2024.107746","url":null,"abstract":"<div><div>Revealing the synoptic patterns associated with extreme precipitation is important in deepening our understanding of extreme precipitation formation. To examine whether the synoptic patterns responsible for the summer extreme precipitation (SEP) have experienced an interdecadal variability over the Tarim Basin (TB), we investigate and compare the synoptic patterns influencing regional SEP over the TB under different interdecadal backgrounds. Results show the SEP over the TB has experienced three distinct periods (1961–1987: dry period; 1988–2009: wet period I; 2010–2023: wet period II) and can be categorized into two dominant patterns, western pattern, and eastern pattern, respectively. The western and eastern patterns of SEP are dominated by the large-scale circulations characterized by directly influenced circulations: Subtropical Westerly Jet (SWJ), Central Asian Cyclone (CAC) and low-level easterly jet/cyclone, which affect the dynamics conditions, as well as indirectly influenced circulations: South Asian High (SAH), Iranian Subtropical High (ISH), Western Pacific Subtropical High (WPSH), Mongolian Anticyclone (MAC) and Siberian Ridge, which modulate water vapor transport. During the Dry Period to Wet Period II, with the increasing influence of the WPSH and MAC, the source and path of water vapor transport yielded an interdecadal adjustment from the Arabian Sea to the Bay of Bengal to the western Pacific Ocean. Regarding the SEP-dominant transition, the differences between the patterns are the location of the SWJ, CAC, and MAC, resulting in substantially different water vapor transport. In the western pattern, the change occurs mainly in the western water vapor path, whereas in the eastern pattern, it is the eastern water vapor that undergoes interdecadal changes. Moreover, discrepancies in the variations of ISH and WPSH in sub-periods not only contribute to the interdecadal variations, but also are responsible for variances between patterns.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"312 ","pages":"Article 107746"},"PeriodicalIF":4.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561453","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":"Liquid cloud drop effective radius over China: A 20-year MODIS-based assessment","authors":"Xiaolin Zhang ,&nbsp;Yuanzhi Wang ,&nbsp;Yele Sun ,&nbsp;Xiaojing Shen ,&nbsp;Huizheng Che ,&nbsp;Thomas Choularton","doi":"10.1016/j.atmosres.2024.107750","DOIUrl":"10.1016/j.atmosres.2024.107750","url":null,"abstract":"<div><div>Clouds are one of the most significant and uncertain components in weather forecasting and climate prediction. The 20-year detailed liquid water cloud effective radius (CER) over China from 2001 to 2020 are systematically studied based on the Moderate Resolution Imaging Spectroradiometer cloud products. The spatial distributions of CER show slight alterations of seasonal patterns of changes over China during 2001–2020. The monthly mean CER values over China vary from 12.7 μm in November to nearly 14.4 μm in July. The summer season has the largest average CER, followed by spring and winter, while autumn exhibits relatively lower CER levels over China. The mean CER values during 2001–2020 are found to be 14.7, 11.8 and 13.0 μm over the Tibetan Plateau, inland and coastal regions of China, respectively. High CERs in spring and winter are seen in the Tibet Plateau, whereas the reverse is true over the inland and coastal regions. The impacts of precipitable water vapor (PWV) and aerosol optical depth on the CER over China are complex, whereas the correlations between CER and PWV can be generally expressed by a two-stage linear fitting, showing distinct turning points in different seasons and regions. The CER over different regions of China shows an increase with enhanced PWV under low or high water vapor conditions as opposed to an increase of CER under moderate water vapor levels. Our study indicates a high CER in the Tibet Plateau and low over the Sichuan Basin, and significantly distinct impact of PWV on the CER in the Tibet Plateau.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"312 ","pages":"Article 107750"},"PeriodicalIF":4.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554736","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":"Fog types frequency and their collectable water potential in the Atacama Desert","authors":"K. Keim-Vera ,&nbsp;F. Lobos-Roco ,&nbsp;I. Aguirre ,&nbsp;C. Merino ,&nbsp;C. del Río","doi":"10.1016/j.atmosres.2024.107747","DOIUrl":"10.1016/j.atmosres.2024.107747","url":null,"abstract":"<div><div>Fog is a widespread phenomenon in the coastal Atacama Desert. Within this region, three types of fog have been described: advective, orographic, and radiative. However, there remains a lack of quantification regarding their frequencies, the physical mechanisms responsible for their formation, and their contribution to fog water collection. Our research quantifies for the first time in the Atacama Desert the frequency of each fog type, the physical conditions conducive to their formation, and their potential for water collection. Using high temporal resolution (10 min) GOES satellite imagery, we define geographical criteria related to the regular area of presence of different types of fogs that allowed us to analyze their frequencies at multiple time scales. Our results reveal that advective fog accounts for ∼76 % of total fog events, with orographic fog ∼22 % and radiative fog ∼2 %. The main physical mechanisms driving advective and orographic fog formation are the sea surface temperature and the thermal inversion layer, whereas for radiative fog formation, it is mainly controlled by the marine boundary layer height. On a monthly scale, advective fog contributes to 60 % of water collection, while orographic fog accounts for 40 %. At the diurnal scale, orographic fog has a higher collection rate per hour. This inversion is influenced by local-scale variables such as wind speed, which plays a crucial role in water collection on a diurnal scale, enhancing orographic fog formation and its relative contribution during afternoon hours. Our research enhances the understanding of fog as a spatial-meteorological phenomenon and a potential water resource, offering a straightforward methodology for classifying fog types in coastal arid regions worldwide.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"312 ","pages":"Article 107747"},"PeriodicalIF":4.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578990","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":"Legacy of aerosol radiative effect predominates daytime dust loading evolution","authors":"Xiaoyan Zhang ,&nbsp;Haishan Chen ,&nbsp;Xiyan Xu ,&nbsp;Xiao-Ming Hu ,&nbsp;Lan Gao ,&nbsp;Gensuo Jia","doi":"10.1016/j.atmosres.2024.107735","DOIUrl":"10.1016/j.atmosres.2024.107735","url":null,"abstract":"<div><div>Dust radiative effect imposes pronounced perturbations on planetary boundary layer (PBL) development. In turn, the modified PBL characteristics and circulation fields regulate subsequent dust processes, which have not been explored sufficiently. In this study, parallel experiments are designed to isolate the instant, legacy and nonlinear impacts of aerosol radiative effect on daytime dust storm evolution over the Tarim Basin. During a typical dust storm event, legacy radiative effect is found to dominate dust loading dynamics and modulates mean dust burden by more than 16 % in the central basin and − 41 % in the marginal basin. Specifically, the dust column concentration increases in central regions but decreases in marginal regions. Dust aerosols cause opposite heating rate distributions and PBL structure between the central and marginal regions through altering radiative balance. Dust-induced cooling effect in the marginal regions leads to PBL suppression and attenuates entrainment mixing. Negative net heating also results in lowered potential temperature, elevated air pressure and thus increases their horizontal gradients. Accordingly, wind speeds are amplified through geostrophic and thermal wind effects, which further accelerate deposition rates, and eventually weaken dust suspension. In the central basin, dust plumes stimulate a warm mixing layer and unstable entrainment zone, which inhibit dry deposition removal and favor dust accumulation in the atmosphere. Our study highlights the importance of accounting PBL dynamics and geostrophic balance in quantifying the impacts of preceding radiative effect on subsequent dust evolution.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"312 ","pages":"Article 107735"},"PeriodicalIF":4.5,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554817","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":"Multi-scale assessment of high-resolution reanalysis precipitation fields over Italy","authors":"Francesco Cavalleri ,&nbsp;Cristian Lussana ,&nbsp;Francesca Viterbo ,&nbsp;Michele Brunetti ,&nbsp;Riccardo Bonanno ,&nbsp;Veronica Manara ,&nbsp;Matteo Lacavalla ,&nbsp;Simone Sperati ,&nbsp;Mario Raffa ,&nbsp;Valerio Capecchi ,&nbsp;Davide Cesari ,&nbsp;Antonio Giordani ,&nbsp;Ines Maria Luisa Cerenzia ,&nbsp;Maurizio Maugeri","doi":"10.1016/j.atmosres.2024.107734","DOIUrl":"10.1016/j.atmosres.2024.107734","url":null,"abstract":"<div><div>This study focuses on the validation of high-resolution regional reanalyses to understand their effectiveness in reproducing precipitation patterns over Italy, a climate change hotspot characterized by coastal sea-land interaction and complex orography. Nine reanalysis products were evaluated, with the ECMWF global reanalysis ERA5 serving as a benchmark. These included both European (COSMO-REA6, CERRA) and Italy-specific (BOLAM, MERIDA, MERIDA-HRES, MOLOCH, SPHERA, VHR-REA_IT) datasets, using different models and parametrizations. The inter-comparison involved determining the effective resolution of daily precipitation fields using wavelet techniques and assessing intense precipitation statistics through frequency distributions. In-situ observations and observational gridded datasets were used to independently validate reanalysis precipitation fields. The capability of reanalyses to depict daily precipitation patterns was assessed, highlighting a maximum radius of precipitation misplacement of about 15 km, with notably lower skills during summer. An overall overestimation of precipitation was identified in the reanalysis climatological fields over the Po Valley and the Alps, whereas multiple products showed an underestimation of precipitations across the North-West coast, the Apennines, and Southern Italy. Finally, a comparison with a time-consistent observational dataset (UniMi/ISAC-CNR) revealed a non-stable deviation from observations in the annual precipitation cumulate of the reanalysis products analyzed. This should be taken into account when interpreting precipitation trends over Italy.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"312 ","pages":"Article 107734"},"PeriodicalIF":4.5,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661367","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}