Atmospheric Research最新文献

{"title":"Monitoring and simulation of a 7-day dust episode and associated dust radiative forcing over the Middle East via synergy of satellite observations, reanalysis datasets and regional/numerical models","authors":"Kaveh Mohammadpour ,&nbsp;Elham Mobarak Hassan ,&nbsp;Dimitris G. Kaskaoutis ,&nbsp;Alireza Rashki ,&nbsp;Nasim Hossein Hamzeh ,&nbsp;Setareh Rahimi","doi":"10.1016/j.atmosres.2025.107948","DOIUrl":"10.1016/j.atmosres.2025.107948","url":null,"abstract":"<div><div>This work examines a persistent dust event over the Middle East (29 June - 5 July 2011), the vertical dust cross-sections and associated radiative effects, via the synergy of satellite observations, reanalyses and two regional high-resolution models (WRF-Chem and RegCM4). The model's evaluation showed a generally better performance of WRF-Chem in aerosol optical depth (AOD) simulations, but with notable biases against satellite and reanalysis data. The dust storm started from the Tigris-Euphrates plains, passed over Kuwait, and affected the Persian Gulf and east Saudi Arabia. The dust plumes were further escalated with dust emissions from the Rub-Al-Khali and Oman Deserts, while they mixed over the Arabian Sea with dusty air masses coming from southwest Asia. Shamal wind over the alluvial Iraqi plains and the Persian Gulf, combined with strong monsoon southwesterlies over the Arabian Sea and northern Levar wind over SW Asia facilitated dust emissions from various sources. In addition, dust outflow from East Africa to Arabia caused a surface shortwave (SW) radiation reduction of ∼100–110 W m^{− 2} in the southern Red Sea, Gulf of Aden and Oman shorelines. Over the northern Arabian Sea, south Red Sea and Gulf of Aden the net (SW + LW) surface radiative effect ranged from −60 to −80 W m⁻². A thick dust plume caused higher SW radiative effects over the southern Caspian Sea (−170 W m⁻²), with a net forcing of −140 W m⁻². The dust radiative cooling resulted in reduction in surface temperature (−1 °C to −2 °C) over the major dust-affected areas. Longwave (LW) radiative forcing (up to 50 W m⁻²) was simulated over the desert regions due to coarse dust. This study highlights notable differences in dust source functions, emission rates, and dust loading between the reanalysis, satellite datasets and model simulations, which may result in important biases in dust radiative effects.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"316 ","pages":"Article 107948"},"PeriodicalIF":4.5,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072692","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":"Improved machine learning estimation of surface turbulent flux using interpretable model selection and adaptive ensemble algorithms over the Horqin Sandy Land area","authors":"Jing Zhao ,&nbsp;Yiyi Guo ,&nbsp;Hongsheng Zhang ,&nbsp;Yihua Lin ,&nbsp;Feng Liu ,&nbsp;Zhenhai Guo","doi":"10.1016/j.atmosres.2025.107952","DOIUrl":"10.1016/j.atmosres.2025.107952","url":null,"abstract":"<div><div>The turbulent exchanges between the land surface and atmosphere, crucial for global climate change and atmospheric circulation, are typically represented through bulk formulae based on Monin-Obukhov similarity theory (MOST), using simple regression as a function of the non-dimensional stability parameter derived from limited field experiments, which leaves large uncertainties. Recently, machine learning is anticipated as an alternative or complement to bulk algorithms, leveraging its ability to detect nonlinear relationships in large datasets without constraints from the similarity relationships and self-correlations prescribed in MOST. However, there are still unresolved problems and gaps, even though common models like random forest and neural networks can be directly applied. This study proposes a hybrid approach for improved estimation of surface turbulent flux, consisting of meta-learner estimation, interpretable model selection, and adaptive model integration. Motivated by understanding how different machine learning algorithms perform as surface-layer flux estimators and further exploring how to utilize results from multiple meta-learners for better estimations, the method starts with eight different machine learning algorithms. Then, a combination of Elastic Net and Shapley Additive Explanations is developed as an interpretable model selection module, followed by an adaptive model integration using AdaBoost and extreme learning machine. Experiments at the continuous observation station in the Horqin Sandy Land area, Inner Mongolia, China, demonstrate that the proposed system delivers reliable and stable performance, significantly reducing estimation bias of three scaling parameters, with root mean square error reductions of 43.16 %–56.97 % compared to MOST, and outperforming the best single machine learning model with additional error reductions of 4.24 %–7.90 %.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"316 ","pages":"Article 107952"},"PeriodicalIF":4.5,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072690","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 interaction of atmospheric boundary layer and PM pollution in Mongolian Plateau: Implication for the threshold control strategy","authors":"Simin Yang ,&nbsp;Yongjing Ma ,&nbsp;Wenyu Zhang ,&nbsp;Zhong Lin ,&nbsp;Zhenguo Lu ,&nbsp;Xingjun Zhou ,&nbsp;Yuanzhe Ren ,&nbsp;Xinbing Ren ,&nbsp;Kecheng Peng ,&nbsp;Yulong Tan ,&nbsp;Yiming Wei ,&nbsp;Masroor Ahmad ,&nbsp;Dandan Zhao ,&nbsp;Lingbin Kong ,&nbsp;Yining Ma ,&nbsp;Yongli Tian ,&nbsp;Jinyuan Xin","doi":"10.1016/j.atmosres.2025.107937","DOIUrl":"10.1016/j.atmosres.2025.107937","url":null,"abstract":"<div><div>The occurrence of severe pollution events is not merely ascribed to internal emission sources but is also influenced by atmospheric boundary layer (ABL). This study examined how variations in ABL affect the pollution formation, accumulation, and dispersion in the mountainous Mongolian Plateau under three distinct atmospheric conditions. Quantitative analyses were performed on particulate matter (PM) and micro-scale meteorological parameters within the ABL. The findings suggest that the convergence of local southwest and southeast winds with northerly winds from the northern mountainous area, in combination with clockwise wind shear within the ABL, can result in explosive PM growth. The persistent transport of southerly airflow near the surface is primarily accountable for the long-term and stable increase in pollutants. Furthermore, low near-surface wind speed (WS), low atmospheric boundary layer height (BLH), high relative humidity (RH), and temperature inversion (TI) are crucial factors contributing to the explosive growth of pollution. Strong northwesterly winds and turbulence directly facilitate pollution dissipation. Turbulent kinetic energy (TKE) and friction velocity (u_⁎) both exhibit a nonlinear negative correlation with near-surface PM concentration. At an altitude of 50 m, TKE and u_⁎ have the most significant impact on PM concentration, with <em>R</em> (Pearson correlation coefficient) of −0.81 and − 0.79 (−0.50 and − 0.17), respectively. Controlling PM_2.5 concentration below 75 μg/m³ can rapidly increase TKE and u_⁎, with values exceeding 2.1 m²/s² and 0.8 m/s, thereby significantly enhancing the atmosphere's self-cleaning capacity. When TKE or u_⁎ rises above 3.8 m²/s² or 1.4 m/s, the PM_2.5 concentration generally decreases to below 30 μg/m³. TKE and u_⁎ above an altitude of 500 m have negligible effects on surface PM.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"316 ","pages":"Article 107937"},"PeriodicalIF":4.5,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072696","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":"New insights into the molecular characteristics-dependent light absorption variation of water-soluble organic matter in biomass burning smoke","authors":"Weifeng Chen ,&nbsp;Huiying Zhang ,&nbsp;Shiming Xu ,&nbsp;Hui Jia ,&nbsp;Zhichong Qi ,&nbsp;Usman Farooq ,&nbsp;Zhigeng Wang ,&nbsp;Qin Dai","doi":"10.1016/j.atmosres.2025.107951","DOIUrl":"10.1016/j.atmosres.2025.107951","url":null,"abstract":"<div><div>Forest fire (mainly wood burning) and crop residue burning (mainly herb burning) are two ways to produce biomass burning smoke water-soluble organic matters (BBS-WSOMs), largely altering atmospheric light absorption. However, their molecular characteristics-dependent light absorption remains unknown. Hence, this study combined Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) analysis with UV–Vis spectrum to deeply investigate the different molecules-dependent light absorption of wood- and herb-derived BBS-WSOMs from different burning temperatures. The results showed that at the tested burning temperatures (300 and 600 °C), biomass types showed a stronger influence on the light absorption at 200–550 nm than burning temperatures. Herb-derived BBS-WSOMs had a stronger light absorption than wood-derived BBS-WSOMs. This was because in herb-derived BBS-WSOMs, more conjugated diene structures or more CHO compounds of low molecular mass and high aromaticity were responsible for their light absorption at 200–300 nm, and more CHON compounds (mainly nitroaromatics compounds) were responsible for their light absorption at 365–550 nm. The CHO/CHOS compounds in wood-derived BBS-WSOMs and CHON compounds in herb-derived BBS-WSOMs were respectively responsible for their light absorption at 365–550 nm. Interestingly, O-containing groups played an increasingly important role in enhancing light absorption with the increasing wavelength at 220–275 nm, while highly aliphatic structure with low O content played an increasingly important role in enhancing light absorption with the increasing wavelength at 365–550 nm. This study is beneficial for deeply understanding the different molecules-dependent light absorption of BBS-WSOMs, having significant implications in atmospheric environment management and quality control.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"316 ","pages":"Article 107951"},"PeriodicalIF":4.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027308","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":"Development of an aerosol optical depth retrieval algorithm based on an improved scattering angle scheme for Advanced Himawari Imager observations","authors":"Jiaqi Jin ,&nbsp;Jing Li ,&nbsp;Man Sing Wong ,&nbsp;Kwon Ho Lee ,&nbsp;Janet Elizabeth Nichol ,&nbsp;P.W. Chan","doi":"10.1016/j.atmosres.2025.107944","DOIUrl":"10.1016/j.atmosres.2025.107944","url":null,"abstract":"<div><div>The Advanced Himawari Imager carried by the Himawari-8/9 geostationary satellite provides an effective tool for high-temporal-resolution aerosol monitoring with 10-min temporal resolution. Aerosol optical depth (AOD), as a crucial parameter for characterizing aerosols, is typically retrieved using physical-based algorithms that rely on prior assumptions about surface reflectance and aerosol models. However, these assumptions may not satisfy the complex land and atmospheric circumstances. This study develops a new AOD retrieval algorithm that improves the accuracy of surface reflectance and aerosol model by leveraging the time-series geostationary observations and aerosol properties clustered from precise ground-based measurements. AOD retrievals for 2022 to 2023 were conducted for southern China (mainly in Guangdong province), and validated against ground measurements from AErosol RObotic NETwork (AERONET) and Sun-sky radiometer Observation NETwork (SONET). The results are also compared with aerosol products from the MODerate resolution Imaging Spectroradiometer (MODIS). The retrieval results showed high consistency with AERONET/SONET, achieving a correlation coefficient of 0.74, RMSE of 0.18, and over 52 % of retrievals within the expected error envelopes (EE) of ±(0.05 + 15 %). In comparison, the Japan Aerospace Exploration Agency (JAXA) AOD products have a lower correlation coefficient of 0.232, RMSE of 0.330, and only about 30 % of retrievals within the EE of ±(0.05 + 15 %). Furthermore, the proposed algorithm outperforms MODIS in terms of accuracy over their common retrievals. The algorithm based on a newly developed scattering scheme improves the retrieval accuracy at different times and can show aerosol diurnal variations in south China.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"316 ","pages":"Article 107944"},"PeriodicalIF":4.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143143978","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":"Variability of solar radiation and cloud cover in the Antarctic Peninsula region","authors":"Simona Szymszová ,&nbsp;Kamil Láska ,&nbsp;Seong-Joong Kim ,&nbsp;Sang-Jong Park","doi":"10.1016/j.atmosres.2025.107940","DOIUrl":"10.1016/j.atmosres.2025.107940","url":null,"abstract":"<div><div>Solar radiation is a key driver of many physical, chemical and biological processes in Antarctic ecosystems and the main component of the surface energy budget. The downward shortwave radiation (DSR) flux varies greatly in the Antarctic Peninsula region due to cloud cover changes, resulting from climate differences between eastern and western coasts. The DSR intensity was measured using A-class pyranometers at the J.G. Mendel (JGM) station located on the northeastern part of the Antarctic Peninsula and at the King Sejong (KSJ) station located on the western part for the period 2011–2016. The influence of the cloud cover on the DSR flux was evaluated using the cloud modification factor calculated for both stations. The effect of surface pressure, water vapour, albedo, cloud cover, ozone and solar zenith angle was examined using partial correlation. We found a 29 %-higher DSR intensity at the JGM station, while the cloud cover was higher at the KSJ station, with a 28 %-lower cloud modification factor compared with the JGM station. At both stations, the DSR variability was affected mainly by the solar zenith angle, followed by cloud cover at the JGM station, whereas the influence of cloud cover and water vapour was similar at the KSJ station. The effect of the albedo was significant for most of the year at the JGM station but only in the winter at the KSJ station. These results reveal significant differences in climate conditions between the western and eastern coasts, which are reflected in local atmospheric and cryospheric processes.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"316 ","pages":"Article 107940"},"PeriodicalIF":4.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144171","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":"Investigating multitype drought propagation thresholds across the different climate regions of China","authors":"Yibo Ding ,&nbsp;Linqi Li ,&nbsp;Juan Du ,&nbsp;Zhaoqiang Zhou ,&nbsp;Shibo Liu ,&nbsp;Wenqing Chen ,&nbsp;Xiaowen Wang ,&nbsp;Li Zhou ,&nbsp;Tianqi Ao","doi":"10.1016/j.atmosres.2025.107950","DOIUrl":"10.1016/j.atmosres.2025.107950","url":null,"abstract":"<div><div>Drought is a common and severe natural hazard worldwide. Understanding its triggering mechanisms is pivotal for comprehending its propagation. However, the triggering mechanisms of multitype drought propagation in diverse climate regions remain unclear. This study presents the first exploration of the triggering mechanisms of multitype drought propagation in the different climate regions of China. ECMWF reanalysis 5th generation and normalized difference vegetation index (NDVI) data were utilized. Drought indices were applied to describe meteorological drought, hydrological drought, agricultural drought, and vegetation drought. The copula function and run theory were employed to estimate the propagation thresholds of multitype drought. The results revealed that (1) the Frank, Gumbel, and Student-t copula functions were optimal for combining different drought types. The generalized Pareto (GP) distribution, Weibull distribution (WBL), and logarithmic normal distribution (Log) were best for describing different types of drought characteristics. (2) The propagation thresholds for meteorological to hydrological and agricultural drought were lower than those for agricultural to hydrological drought. The propagation thresholds for agricultural to hydrological drought were notably greater in the temperate humid and subhumid region in Northeast China (SR-3) and the warm-temperate humid and subhumid region in North China (SR-4). (3) Vegetation drought was more difficult to trigger in forests and deserts than in grasslands and croplands. Vegetation drought was more difficult to trigger in the temperate and warm-temperate desert of northwestern China (SR-1) and the tropical humid region in South China (SR-7). These findings offer profound insights into drought propagation dynamics across various climates and into early warning, defense against, and forecasting of multitype drought.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"316 ","pages":"Article 107950"},"PeriodicalIF":4.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143143555","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":"Convection-permitting climate simulations over South America: Experimentation during different phases of ENSO","authors":"Changhai Liu ,&nbsp;Kyoko Ikeda ,&nbsp;Andreas Prein ,&nbsp;Lucia Scaff ,&nbsp;Francina Dominguez ,&nbsp;Roy Rasmussen ,&nbsp;Yongjie Huang ,&nbsp;Jimy Dudhia ,&nbsp;Wei Wang ,&nbsp;Fei Chen ,&nbsp;Lulin Xue ,&nbsp;Lluís Fita ,&nbsp;Miguel Lagos-Zúñiga ,&nbsp;Waldo Lavado-Casimiro ,&nbsp;Mariano Masiokas ,&nbsp;Franciano Puhales ,&nbsp;Leidy Johanna Yepes","doi":"10.1016/j.atmosres.2025.107936","DOIUrl":"10.1016/j.atmosres.2025.107936","url":null,"abstract":"<div><div>This paper presents the first-ever continental-scale convection-permitting simulations over South America for three water years of different ENSO phases, corresponding to an ENSO neutral year (2018/19), an EI Niño year (2015/16), and a La Niña year (2010/11), using the Weather Research and Forecasting (WRF) model at 4-km grid spacing. The model performance has been validated against precipitation derived from satellite, surface observations, and surface air temperature from reanalysis. The evaluation shows a promising skill at reproducing the observed multi-scale spatiotemporal characteristics of precipitation and temperature, such as the seasonal and sub-seasonal variability, the diverse patterns of diurnal cycle, and deep convective clouds. Sensitivity simulations quantify the impacts of cumulus parameterization, grid spacing, and spectral nudging. Results indicate that a tested scale-aware convection scheme has little benefit, and the model performance degrades as horizontal resolution decreases. Spectral nudging can reduce the precipitation bias over some tropical and subtropical regions but exacerbates the wet bias over the Andean Mountains. A noteworthy model deficiency shared in all simulations is the excess orographic precipitation, a problem in association with the overly active afternoon-evening convection possibly resultant from under-representation of clouds and missing cloud-aerosol interaction, though the uncertainty of observational data might contribute to the wet bias as well. These results provide useful guidance for improving the model physics. The overall encouraging agreement between the 4-km model simulations and observations provides confidence in the usage of the established model configuration for regional climate downscaling and climate change projections over South America.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"316 ","pages":"Article 107936"},"PeriodicalIF":4.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143228020","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":"Will the world experience more fractal droughts?","authors":"L. Galiano ,&nbsp;R. Monjo ,&nbsp;D. Royé ,&nbsp;J. Martin-Vide","doi":"10.1016/j.atmosres.2025.107941","DOIUrl":"10.1016/j.atmosres.2025.107941","url":null,"abstract":"<div><div>Meteorological droughts will become the principal factor driving compound hot-dry events and analysis thereof is therefore fundamental with regard to understanding future climate patterns. The average citizen knows little of geometry, but it plays an essential role in the characteristics of the droughts, by means of “fractional lengths”. We analyzed the fractality of the meteorological droughts under the most recent climate change scenarios. A temporal fractality measure based upon the Cantor set reveals consensual changes in the behavior of droughts worldwide. Most regions will undergo a slight increase in fractality (up to +10 % on average), particularly associated with an acceleration of the hydrological cycle and the Hadley cell expansion, with a shift towards the higher latitudes of the tropical edge in both hemispheres. Geometrical measures were applied to the dry spells (&lt;1 mm) at a daily scale simulated by the SSP2–4.5 and SSP5–8.5 scenarios from 10 different Earth System Models of the Coupled Model Intercomparison Project Phase 6 (CMIP6). The historical experiment was used as a baseline (1981–2010) and also compared to the ERA5 reanalysis. The results show an increasingly concentrated or uneven distribution of droughts in mid-latitudes towards the end of the century, becoming more intense the more pessimistic the scenario selected. Simultaneously, the polar regions might benefit from more regular precipitation patterns. Other inequality measures, such as the indices of Gini and Monjo, showed similar results. In general terms, the earth's climate will be more fractal in the rainfall-related patterns, which likely means that the consequences will be more catastrophic for the human population.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"316 ","pages":"Article 107941"},"PeriodicalIF":4.5,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144172","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":"On the detection sensitivities of dual-frequency radars onboard FY-3G and GPM-CO","authors":"Bo Liu ,&nbsp;Haoran Li ,&nbsp;Liping Liu ,&nbsp;Jian Shang ,&nbsp;Kwo-Sen Kuo ,&nbsp;Chunsong Lu ,&nbsp;Mei Yuan ,&nbsp;Bosen Jiang","doi":"10.1016/j.atmosres.2025.107935","DOIUrl":"10.1016/j.atmosres.2025.107935","url":null,"abstract":"<div><div>This study provides the first evaluation of the detection capabilities of the FY-3G dual-frequency Precipitation Measurement Radar (PMR) using storm top observations. Additionally, the impact of the GPM-CO orbit boost in November 2023 on Dual-frequency Precipitation Radar (DPR) observations is assessed from the perspective of the PMR. The minimum detectable radar reflectivities for the FY-3G Ku- and Ka-band radars were determined to be 12.03 dBZ and 8.60 dBZ, respectively. Notably, the better sensitivity of the FY-3G Ka-band radar enabled the detection of more and higher storm tops and significantly reduced the misidentification of the melting layer as the storm top compared to the GPM Ka-band Precipitation Radar (KaPR). At the same time, the PMR is more significantly affected by ground clutter, partly as a trade-off for its enhanced sensitivity, compared to the DPR. This increased susceptibility necessitates more rigorous ground validation of its near-surface precipitation retrieval. The sensitivity degradation of the KaPR resulting from the GPM-CO orbit boost further intensifies the underestimation of snow dual-frequency ratio (DFR) measurements, resulting in an increased classification of precipitation as convective by the DFRm method. Our results are expected to illuminate future algorithm development and data comparisons of FY-3G and GPM-CO radars.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"316 ","pages":"Article 107935"},"PeriodicalIF":4.5,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144170","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}