Journal of Quantitative Spectroscopy & Radiative Transfer最新文献

{"title":"Investigating the radiative properties of large dust aggregate particles via the Monte Carlo ray tracing method","authors":"Xiaochuan Liu,&nbsp;Yanxia Tang,&nbsp;Keyong Zhu,&nbsp;Yong Huang","doi":"10.1016/j.jqsrt.2024.109219","DOIUrl":"10.1016/j.jqsrt.2024.109219","url":null,"abstract":"<div><div>Understanding the radiative properties of particles is essential for interpreting and analyzing atmospheric remote sensing, target detection, combustion diagnostics, etc. At present, there is a relative lack of studies and understanding of the radiative properties of large aggregate particles. In this work, we comprehensively investigate the radiative properties of large dust aggregate particles via the developed Monte Carlo ray tracing method. Large dust aggregate models with monodisperse and polydisperse monomers are constructed, respectively. The effects of various factors on the radiative properties of large dust aggregate particles are analyzed. We find that the larger geometric standard deviation and the greater number of monomers lead to slightly larger backscattering and an increase of the overall radiative energy distribution on the receiving surface. With increasing the size parameter, the scattering phase function becomes smoother and the difference between the scattering phase function of spheres and aggregates diminishes. The absorptivity is proportional to the size parameter and inversely proportional to the number of monomers. At a size parameter of 100, the absorptivity and the peak of the radiative energy distribution of monodisperse monomer aggregates are higher than those of polydisperse monomer aggregates, and gradually converge with the increase of particle size parameter. Overall, this work helps to enhance the knowledge of the radiative properties of large aggregate particles.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"330 ","pages":"Article 109219"},"PeriodicalIF":2.3,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electron-impact ionization for Ne3+ and Ne4+","authors":"A. Kynienė,&nbsp;Š. Masys,&nbsp;V. Jonauskas","doi":"10.1016/j.jqsrt.2024.109224","DOIUrl":"10.1016/j.jqsrt.2024.109224","url":null,"abstract":"<div><div>Ionization cross sections are studied for energy levels of the ground configurations of the Ne<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> and Ne<span><math><msup><mrow></mrow><mrow><mn>4</mn><mo>+</mo></mrow></msup></math></span> ions. The distorted wave (DW) approximation is used to analyze experimental data. The scaled DW cross sections are used to explain measurements for the Ne<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> ion. Study includes analysis of contributions from the direct and indirect ionization processes. Convergences of excitation-autoionization (EA) channels are estimated by analyzing excitations up to shells with the principal quantum number <span><math><mrow><mi>n</mi><mo>⩽</mo><mn>20</mn></mrow></math></span>. This study shows that the EA process provides from <span><math><mo>∼</mo></math></span>10% to 20% for the energy levels of the ground configurations of the Ne<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> and Ne<span><math><msup><mrow></mrow><mrow><mn>4</mn><mo>+</mo></mrow></msup></math></span> ions.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"330 ","pages":"Article 109224"},"PeriodicalIF":2.3,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MERLIN, an adaptative LTE radiative transfer model for any mixture: Validation on Eurofer97 in argon atmosphere","authors":"Aurélien Favre,&nbsp;Arnaud Bultel,&nbsp;Vincent Morel,&nbsp;Morgan Lesage,&nbsp;Léo Gosse","doi":"10.1016/j.jqsrt.2024.109222","DOIUrl":"10.1016/j.jqsrt.2024.109222","url":null,"abstract":"<div><div>Optical Emission Spectroscopy is used within the LIBS (Laser-Induced Breakdown Spectroscopy) technique to measure the elemental composition of a sample irradiated by a laser pulse. When the objective is to characterize a known alloy or to analyze the sample semi-quantitatively, standards can be used. This method refers to the “calibrated LIBS”. When the studied sample is complex (for instance unknown alloy and/or concentration gradients), the modeling of the experimental emission spectra leads to the determination of the laser-induced plasma characteristics including its composition. This second method refers to the “calibration-free LIBS”.</div><div>In this paper, we present the radiative transfer code MERLIN (MultiElemental Radiative equiLibrIum emissioN) aiming at matching experimental spectra of a laser-induced plasma in Local Thermodynamic Equilibrium (LTE) conditions for calibration-free LIBS. MERLIN provides the simulated spectra for any elementary mixture thanks to queries from spectral databases available online. The code is optimized and modular to allow outputs even for a high number of species.</div><div>The validation of MERLIN presented in the paper is based on a thorough analysis of the plasma emission performed on the alloy Eurofer97 in experimental conditions providing the LTE. The reconstruction of the observed spectra is performed with MERLIN. For the reconstruction, no adjusted variable is required since all the necessary parameters are derived from experiments.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"330 ","pages":"Article 109222"},"PeriodicalIF":2.3,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The first satellite measurements of HFC-125 by the ACE-FTS: Long-term trends and distribution in the Earth’s upper troposphere and lower stratosphere","authors":"R. Dodangodage ,&nbsp;P.F. Bernath ,&nbsp;C. Boone ,&nbsp;J.J. Harrison ,&nbsp;M. Lecours ,&nbsp;M. Schmidt ,&nbsp;S.A. Montzka ,&nbsp;I. Vimont ,&nbsp;M. Crotwell","doi":"10.1016/j.jqsrt.2024.109218","DOIUrl":"10.1016/j.jqsrt.2024.109218","url":null,"abstract":"<div><div>HFC-125 (CF<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>CHF<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>, pentafluoroethane) volume mixing ratios (VMRs) have been determined for the first time using infrared absorption spectra from the Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS) from 2004 to 2024. These VMRs provide global altitude-latitude VMR distributions. A VMR time series for HFC-125 has also been calculated and compared to values from in situ discrete flask measurements conducted by the National Oceanic and Atmospheric Administration Earth System Research Laboratory. The abundance of HFC-125 is currently experiencing exponential growth. ACE data shows a growth rate of 3.47 ± 0.05 ppt/year in the past six years.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"330 ","pages":"Article 109218"},"PeriodicalIF":2.3,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sulfur dioxide sources in the stratosphere","authors":"Peter F. Bernath ,&nbsp;Manish Bhusal","doi":"10.1016/j.jqsrt.2024.109217","DOIUrl":"10.1016/j.jqsrt.2024.109217","url":null,"abstract":"<div><div>Version 5.2 SO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> data from the Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS) in low Earth orbit are used to determine global altitude–latitude abundance distributions. This new data set has SO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> volume mixing ratios (VMRs) from 11.5 to 39.5 km in altitude from February 2004 to July 2023. The average background SO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> abundance is plotted along with the abundance for four different seasons. These distributions show that there is a stratospheric source of SO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> that comes from the decline in sulfate aerosol abundance with increasing altitude. The visible and near-infrared photolysis of sulfuric acid (H<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>SO<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span>) is the primary source of SO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> in the middle stratosphere. There is also a source of SO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> in the upper stratosphere and mesosphere. The Brewer-Dobson circulation enhances SO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> at higher altitudes, particularly by descent near the winter pole. The elevated abundance of SO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> near the poles originates from meteoric sources as well as UV photolysis of H<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>SO<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span> in the mesosphere. Large volcanic eruptions release sulfur dioxide (SO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>) into the lower stratosphere, where it persists for several months.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"330 ","pages":"Article 109217"},"PeriodicalIF":2.3,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Spectral Gamma Function of gas absorption coefficient and its application to analysis and enhancement of the correlated spectral modeling of radiative transfer in non-uniform gaseous media","authors":"Vladimir P. Solovjov ,&nbsp;Frederic André ,&nbsp;Brent W. Webb ,&nbsp;Mathieu Compiègne ,&nbsp;Philippe Dubuisson ,&nbsp;Laurent C. Labonnote","doi":"10.1016/j.jqsrt.2024.109214","DOIUrl":"10.1016/j.jqsrt.2024.109214","url":null,"abstract":"<div><div>A novel Spectral Gamma Function is introduced to address the limitations associated with the “correlated” spectrum assumption in radiative transfer modeling in non-uniform gaseous media. The Spectral Gamma Function combines high-resolution gas absorption spectra with their distribution functions, capturing the “correlated” properties of absorption spectra at different thermodynamic states. This concept is applicable both to narrow bands and the full spectrum, enabling the construction of truly “correlated” models and the calculation of statistical relationships between absorption spectra. The paper presents the definition and properties of the Spectral Gamma Function. The Function 1) allows the construction of sets of truly “correlated” high-resolution spectra from which the “distance” to a real set of gas spectra can be characterized; 2) provides a simple way to evaluate Spearman's rank correlation between spectra in distinct states yielding useful information about the statistical relationship between these spectra; and 3) allows for the approximation of a real set of Line-by-Line (LBL) data as a non-linear combination of “correlated” models called MetaLBL modeling. Additionally, the function may be used to demonstrate the optimality of the Rank Correlated Spectral Line Weighted-sum-of-gray-gases (RC-SLW) Model in the space of “correlated” models, thus demonstrating that the RC-SLW Model represents the limit of accuracy in the family of correlated models. This work represents the first proposal of such a development extending modeling approaches beyond those inherent in the assumption of correlated spectra in the field of gas radiation modeling, offering promising insights for practical applications. Moreover, the MetaLBL modeling strategy is applied in a test case from atmospheric sciences for which models with a user-specified accuracy are constructed.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"330 ","pages":"Article 109214"},"PeriodicalIF":2.3,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Line-shape parameters of the oxygen first rotational triplet","authors":"M.A. Koshelev,&nbsp;I.N. Vilkov,&nbsp;G.Yu. Golubiatnikov,&nbsp;A.Yu. Sekacheva,&nbsp;M.Yu. Tretyakov","doi":"10.1016/j.jqsrt.2024.109220","DOIUrl":"10.1016/j.jqsrt.2024.109220","url":null,"abstract":"<div><div>A lines shape of the first triplet of rotational band of oxygen molecule was studied beyond the Voigt profile in the framework of the quadratic approximation of speed dependence of collision relaxation rate. Recordings of the lines broadened by O₂ and N₂ were obtained at room temperature using two fundamentally different spectrometers, in particular, a video spectrometer and a spectrometer with radio-acoustic detection of absorption. A set of line-shape parameters was determined based on the line recording analysis. Data accuracy and reliability was evaluated from a comparative analysis of the parameters obtained from different techniques and with previous data.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"330 ","pages":"Article 109220"},"PeriodicalIF":2.3,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eliminating blowing-ups and evanescent waves when using the finite series technique in evaluating beam shape coefficients for some T-matrix approaches, with the example of Gaussian beams","authors":"Gérard Gouesbet ,&nbsp;Jianqi Shen ,&nbsp;Leonardo André Ambrosio","doi":"10.1016/j.jqsrt.2024.109212","DOIUrl":"10.1016/j.jqsrt.2024.109212","url":null,"abstract":"<div><div>When evaluating beam shape coefficients which encode the description of laser beams, for use in some T-matrix approaches such as generalized Lorenz-Mie theory or Extended Boundary Condition Method for structured beams, by using finite series, blowing-ups are observed. When numerical inaccuracies are ruled out, it has been firmly demonstrated that such blowing-ups correspond to genuine physical phenomena, namely they describe evanescent waves. We propose a method to eliminate these blowing-ups and the corresponding evanescent waves (at least most of them).</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"330 ","pages":"Article 109212"},"PeriodicalIF":2.3,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Light scattering by Möbius particles","authors":"Yehor Surkov ,&nbsp;Yuriy Shkuratov ,&nbsp;Vadym Kaydash ,&nbsp;Yong-Le Pan ,&nbsp;Aimable Kalume ,&nbsp;Joshua Santarpia ,&nbsp;Yongxiang Hu ,&nbsp;Gorden Videen","doi":"10.1016/j.jqsrt.2024.109215","DOIUrl":"10.1016/j.jqsrt.2024.109215","url":null,"abstract":"<div><div>Using the Discrete-Dipole Approximation (DDA) we study scattering-angle dependences of the orientationally averaged Mueller matrix elements for small Möbius particles with different chirality. A Möbius particle is a strip of a certain width and thickness, the ends of which are attached to each other after twisting one of them at an angle by a multiple of □. The Mueller matrices <em>M_ik</em> for such particles have 16 non-zero elements. The scattering-angle dependences of the intensity <em>M</em>₁₁, linear polarization degree (-<em>M</em>₁₂/<em>M</em>₁₁), and Circular Intensity Differential Scattering (CIDS = -<em>M</em>₁₄/<em>M</em>₁₁) show their sensitivity to the refractive index and number of the strip twisting. For instance, the CIDS depends significantly on the complex part of the refractive index. Particles with more twists show a decrease in the maximum value of the positive branch of linear polarization and an increase in the width and minimum of the negative branch. The twist parameter's influence on CIDS is non-monotonic, initially increasing and then approaching zero with further twisting.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"329 ","pages":"Article 109215"},"PeriodicalIF":2.3,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The k-bin tool: Fast and flexible k-distribution algorithms written in Python","authors":"Nils Madenach,&nbsp;Rene Preusker,&nbsp;Nicole Docter,&nbsp;Lena Jänicke,&nbsp;Jürgen Fischer","doi":"10.1016/j.jqsrt.2024.109213","DOIUrl":"10.1016/j.jqsrt.2024.109213","url":null,"abstract":"<div><div>Radiative transfer simulations (RTS) still face significant challenges in accurately representing the highly complex gas absorption spectra of the Earth’s atmosphere. Line-by-line RTS achieves high accuracy by solving radiative transfer equations for narrow spectral intervals, but at a considerable computational cost. Especially in remote sensing and climate modeling, a trade-off between efficiency and accuracy must be done. k-distribution methods are widespread in the scientific community and offer a way to make this trade-off. k-distribution methods reorder the absorption spectra <span><math><mi>k</mi></math></span> for a given spectral interval and find appropriate so-called k-bins. In the k-space much less integration points can be used, while maintaining high accuracy. The way to find optimal k-bins differs from method to method and depends on the application. In this paper, we present the flexible and fast k-bin tool. The python based lightweight k-bin tool provides a variety of different k-distribution methods and configuration options. One k-distribution method is the in-house developed k-bin approach. The different setups of the tool can be easily compared, helping to decide which method and configuration is best suited for a given application. We encourage the user of the tool to continue to optimize the k-bin tool and to extend it with new approaches and functionalities.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"329 ","pages":"Article 109213"},"PeriodicalIF":2.3,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}