Journal of Quantitative Spectroscopy & Radiative Transfer最新文献

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Hyperfine structure odd-parity configurations of the terbium atom, Part I: Levels with small J 铽原子的超线性结构奇偶构型,第一部分:具有小[式略]的层次
IF 2.3 3区 物理与天体物理
Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-11-18 DOI: 10.1016/j.jqsrt.2024.109274
B. Furmann, M. Klempka, S. Mieloch, D. Stefańska, P. Głowacki
{"title":"Hyperfine structure odd-parity configurations of the terbium atom, Part I: Levels with small J","authors":"B. Furmann,&nbsp;M. Klempka,&nbsp;S. Mieloch,&nbsp;D. Stefańska,&nbsp;P. Głowacki","doi":"10.1016/j.jqsrt.2024.109274","DOIUrl":"10.1016/j.jqsrt.2024.109274","url":null,"abstract":"<div><div>The paper presents the results of measurements of the hyperfine structure for electronic levels belonging to odd configurations in the terbium atom with a small quantum number <span><math><mi>J</mi></math></span>. Laser spectroscopy with laser-induced fluorescence detection was used in the measurements. The hyperfine structure of 32 terbium lines was measured in three spectral regions. The hyperfine structure constants were determined for 20 levels with quantum number <span><math><mi>J</mi></math></span> values between 1/2 and 7/2, of which 13 levels have not been studied so far. For the remaining 7 levels, the precision of the constants was improved.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"332 ","pages":"Article 109274"},"PeriodicalIF":2.3,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696401","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}
引用次数: 0
Comparative analysis of theories accounting for quantum effects in plasmonic nanoparticles 等离子纳米粒子量子效应理论的比较分析
IF 2.3 3区 物理与天体物理
Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-11-17 DOI: 10.1016/j.jqsrt.2024.109268
Yuri Eremin, Vladimir Lopushenko
{"title":"Comparative analysis of theories accounting for quantum effects in plasmonic nanoparticles","authors":"Yuri Eremin,&nbsp;Vladimir Lopushenko","doi":"10.1016/j.jqsrt.2024.109268","DOIUrl":"10.1016/j.jqsrt.2024.109268","url":null,"abstract":"<div><div>Understanding and accounting for quantum effects in nanoplasmonics is essential for accurate modeling and design of nanophotonic devices. In this paper, we investigate the influence of such quantum effects as spatial nonlocality and splitting of the wave function of conduction electrons near the surface of plasmonic nanoparticles on the extinction cross-section and the field enhancement factor. We apply the theory of generalized nonlocal optical response (GNOR) to describe the spatial nonlocality of noble metal particles. To consider the behavior of electrons near the metal–dielectric interface, mesoscopic boundary conditions are used, including the surface response functions (SRF) - the Feibelman parameters. We use the discrete source method (DSM), allowing for numerical analysis of the scattering problems taking into account quantum effects in the frame of both theories. The application of both GNOR and SRF approaches leads to a decrease in the amplitude of the plasmon resonance compared to the classical Maxwell theory and its shift to the shorter wavelength region (blue shift). The simulation results demonstrate significant differences between the two theories explaining the quantum effects arising in non-spherical plasmonic nanoparticles located in a dense environment. Specifically, compared with GNOR theory, SRF predicts a larger field enhancement. We found that quantum nonlocal effects are more significant for the enhancement factor at the particle surface than for the extinction cross-section. In addition, it was discovered that a denser environment leads to a significant increase in the blue shift of the plasmonic peak.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109268"},"PeriodicalIF":2.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696399","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}
引用次数: 0
Complex refractive index from scattering measurements for an acoustically levitated single particle 通过散射测量获得声学悬浮单粒子的复折射率
IF 2.3 3区 物理与天体物理
Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-11-17 DOI: 10.1016/j.jqsrt.2024.109269
Mikko Vuori, Antti Penttilä, Karri Muinonen, Heikki Suhonen, Joel Jääskeläinen
{"title":"Complex refractive index from scattering measurements for an acoustically levitated single particle","authors":"Mikko Vuori,&nbsp;Antti Penttilä,&nbsp;Karri Muinonen,&nbsp;Heikki Suhonen,&nbsp;Joel Jääskeläinen","doi":"10.1016/j.jqsrt.2024.109269","DOIUrl":"10.1016/j.jqsrt.2024.109269","url":null,"abstract":"<div><div>Sample properties such as shape and size can be studied via light scattering, if the material complex refractive index is known. A numerical method which utilizes laboratory measurements for deriving the complex refractive index of a mm-sized single particle is introduced. The laboratory measurements are carried out using a <span><math><mrow><mn>4</mn><mi>π</mi></mrow></math></span> scatterometer that measures the intensity of polarized light scattered from an acoustically levitated sample in a fixed orientation as a function of scattering angle. To obtain the complex refractive index of the particle, measurements were compared to simulations done using a newly modified SIRIS4 Fixed Orientation geometric optics code. The real and imaginary part of the complex refractive index were varied in the simulations to find the best match between measurements and simulations. The complex refractive index of a levitated single particle was successfully derived in a specific wavelength using two different methods of translating sample orientation from measurements to simulations. For the first time, scattering matrix results from a measurement of a levitated mm-sized single particle in a fixed orientation were compared to light scattering simulations. The complex refractive index of a glass particle was derived successfully, verifying our method of refractive index retrieval from such measurements.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109269"},"PeriodicalIF":2.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696398","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}
引用次数: 0
Electronic structure, spectroscopic constants, and transition properties of NaC 0/+1/−1 diatomic species: An ab initio investigation NaC [式省略] 二原子物种的电子结构、光谱常数和过渡特性:ab initio 研究
IF 2.3 3区 物理与天体物理
Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-11-17 DOI: 10.1016/j.jqsrt.2024.109263
Yves Hassan Gouromsa , Berthelot Saïd Duvalier Ramlina Vamhindi , Mama Nsangou
{"title":"Electronic structure, spectroscopic constants, and transition properties of NaC 0/+1/−1 diatomic species: An ab initio investigation","authors":"Yves Hassan Gouromsa ,&nbsp;Berthelot Saïd Duvalier Ramlina Vamhindi ,&nbsp;Mama Nsangou","doi":"10.1016/j.jqsrt.2024.109263","DOIUrl":"10.1016/j.jqsrt.2024.109263","url":null,"abstract":"<div><div>Diatomic species play a pivotal role in complex media, such as the interstellar and circumstellar media. Furthermore, there is a notable lack of information regarding NaC and its ions, NaC<span><math><msup><mrow></mrow><mrow><mo>+</mo></mrow></msup></math></span> and NaC<span><math><msup><mrow></mrow><mrow><mo>−</mo></mrow></msup></math></span>, despite the pervasiveness of the carbon element (C) and the validated role of Na-bearing molecules as organic reagents or in catalytic processes. In this study, ab initio multi-reference calculations, including core valence and complete basis set schemes, were employed to accurately determine the potential energy curves (PECs), dipole moment functions (DMFs) and transition dipole moments (TDMs) of ten, three and ten low-lying electronic states energies, respectively, for NaC, NaC<span><math><msup><mrow></mrow><mrow><mo>+</mo></mrow></msup></math></span> and NaC<span><math><msup><mrow></mrow><mrow><mo>−</mo></mrow></msup></math></span> diatomics species. The obtained results permitted the accurate determination of spectroscopic constants and vibrational transition properties, including vibrational level energies, Franck–Condon factors (FCFs), Einstein coefficients, absorption band oscillator strengths, vibrational transition energies and radiative lifetimes of allowed transitions. The predicted adiabatic ionisation energy value for NaC is 6.659 eV, while the vertical ionisation energy value is 6.676 eV. Similarly, the predicted adiabatic electron affinity value for NaC is 0.614 eV, while the vertical electron affinity value is 0.613 eV.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109263"},"PeriodicalIF":2.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696414","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}
引用次数: 0
Dielectronic satellite spectra from hollow He- and Li-like ion states in fluorine 氟中空氦离子和类锂离子态的电子卫星光谱
IF 2.3 3区 物理与天体物理
Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-11-16 DOI: 10.1016/j.jqsrt.2024.109272
A.S. Safronova, A. Stafford, U.I. Safronova
{"title":"Dielectronic satellite spectra from hollow He- and Li-like ion states in fluorine","authors":"A.S. Safronova,&nbsp;A. Stafford,&nbsp;U.I. Safronova","doi":"10.1016/j.jqsrt.2024.109272","DOIUrl":"10.1016/j.jqsrt.2024.109272","url":null,"abstract":"<div><div>About two decades ago, very unusual highly-resolved x-ray spectra were observed using a femtosecond laser-produced plasma that included a new type of satellite lines identified as being emitted from the autoionizing states of hollow ions (such as, for example, exotic KK hollow ions with the empty K shell). Though atomic structure calculations were able to predict the locations of such newly observed spectral features with reasonable precision, the relatively high intensity of these so-called hypersatellite lines, produced mainly in high-power laser plasmas, is far from being understood. The analysis of previous experiments with Teflon on the Leopard laser performed under different conditions related to laser pulse and contrast revealed the existence of KK hollow fluorine ions and motivated systematic theoretical studies of dielectronic satellite spectra from hollow ion states starting with He- and Li-like fluorine ions presented in this paper.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109272"},"PeriodicalIF":2.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696415","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}
引用次数: 0
Hyperfine structure of Lu I transition at 642 nm and its application to explore new odd parity autoionization resonances 642 纳米波长处 Lu I 转变的超精细结构及其在探索新奇奇奇偶性自电离共振中的应用
IF 2.3 3区 物理与天体物理
Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-11-16 DOI: 10.1016/j.jqsrt.2024.109273
Laxmi priya Meher , Vipul Kumar , Diptimayee Biswal , Asawari D. Rath
{"title":"Hyperfine structure of Lu I transition at 642 nm and its application to explore new odd parity autoionization resonances","authors":"Laxmi priya Meher ,&nbsp;Vipul Kumar ,&nbsp;Diptimayee Biswal ,&nbsp;Asawari D. Rath","doi":"10.1016/j.jqsrt.2024.109273","DOIUrl":"10.1016/j.jqsrt.2024.109273","url":null,"abstract":"<div><div>Resonance ionization mass spectroscopy using three-step photoionization (PI) schemes was employed to study the 642 nm transition of Lu I. Multimode tunable dye lasers were used in these studies to confirm the transition and further characterization of its hitherto unreported hyperfine structure. The hyperfine features of less abundant isotope <sup>176</sup>Lu and hyperfine A constant of upper level of 642 nm line and its transition isotope shift were determined for the first time. New autoionization resonances of odd parity connecting from the upper level of this transition were explored in the range 48315 – 50940 cm<sup>−1</sup>.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109273"},"PeriodicalIF":2.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696413","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}
引用次数: 0
Isotopologue dependence of the CO2-air broadening and shifting coefficients: Experimental evidence and comparison with theory for 13CO2 and 12CO2
IF 2.3 3区 物理与天体物理
Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-11-15 DOI: 10.1016/j.jqsrt.2024.109271
Didier Mondelain , Alain Campargue , Robert R. Gamache , Jean-Michel Hartmann , Fabien Gibert , Georg Wagner , Manfred Birk , Christian Röske
{"title":"Isotopologue dependence of the CO2-air broadening and shifting coefficients: Experimental evidence and comparison with theory for 13CO2 and 12CO2","authors":"Didier Mondelain ,&nbsp;Alain Campargue ,&nbsp;Robert R. Gamache ,&nbsp;Jean-Michel Hartmann ,&nbsp;Fabien Gibert ,&nbsp;Georg Wagner ,&nbsp;Manfred Birk ,&nbsp;Christian Röske","doi":"10.1016/j.jqsrt.2024.109271","DOIUrl":"10.1016/j.jqsrt.2024.109271","url":null,"abstract":"<div><div>Fifteen transitions of the 20012-00001 band of <sup>13</sup>CO<sub>2</sub> in air have been recorded at 296 K using a cavity ring-down spectrometer linked to an optical frequency comb referenced to a GPS-disciplined Rb oscillator. In parallel, measurements of <sup>12</sup>CO<sub>2</sub> in air were made with a Fourier transform spectrometer for transitions belonging to the same 20012-00001 band, enabling comparison of the air-induced half-width and line shift coefficients of both isotopologues. For that, a multi-spectrum fit procedure is adopted with a Hartmann-Tran (HT) line profile. A decrease of about 0.4% is demonstrated for the <sup>13</sup>CO<sub>2</sub> air-broadening coefficients compared to the corresponding values of the main isotopologue. To the best of our knowledge, this observation is the first experimental evidence of an isotopic effect on the air-broadening coefficients in CO<sub>2</sub> (which are generally assumed to be independent of the isotopologue in spectroscopic databases).</div><div>On the theoretical side, a refinement of the simple model described in [Lamouroux <em>et al.</em> JQSRT 111;2010:2321] is proposed which enables the determination of the air-broadening coefficients for the <sup>13</sup>CO<sub>2</sub> isotopologue from the <sup>12</sup>CO<sub>2</sub> values. In addition, complex Robert-Bonamy-Ma (CRBM) calculations have been performed for <sup>12</sup>CO<sub>2</sub> and <sup>13</sup>CO<sub>2</sub> in collision with N<sub>2</sub> or O<sub>2</sub> for the 20012-00001 band with <em>J</em>″ values from 0 to 85. From these CRBM data, the <sup>13</sup>CO<sub>2</sub>-air and <sup>12</sup>CO<sub>2</sub>-air half-width and line shift coefficients were computed and the obtained isotopologue effect on these parameters was compared to the experimental data. A good average agreement is achieved for the CRBM calculations for the air-broadening coefficients while the simple model leads to slightly smaller isotopic effects. In contrast, for the air-pressure shift coefficients, a quite large disagreement is observed between the calculations and the experimental data.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"333 ","pages":"Article 109271"},"PeriodicalIF":2.3,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150021","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}
引用次数: 0
The characterization of electronic structures and spin-orbit couplings in the diatomic sodium arsenide cation 二原子砷化钠阳离子的电子结构和自旋轨道耦合的表征
IF 2.3 3区 物理与天体物理
Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-11-14 DOI: 10.1016/j.jqsrt.2024.109270
Chang Wang, Yan Chen, Shan-Jun Chen, Song Li
{"title":"The characterization of electronic structures and spin-orbit couplings in the diatomic sodium arsenide cation","authors":"Chang Wang,&nbsp;Yan Chen,&nbsp;Shan-Jun Chen,&nbsp;Song Li","doi":"10.1016/j.jqsrt.2024.109270","DOIUrl":"10.1016/j.jqsrt.2024.109270","url":null,"abstract":"<div><div>A high-level <em>ab initio</em> computation has been performed in order to determine the molecular structures, electronic characters and transition properties of a hitherto unknown diatomic cation of NaAs<sup>+</sup>. The electronic states associated with five dissociation channels, including both the Na<sup>+</sup>+As and Na+As<sup>+</sup> limits, are subjected to detailed analysis. The results of the potential energy functions, spectroscopic constants and vibrational energy levels of the relevant states are presented herewith. The impact of the spin-orbit coupling effect on the low-lying electronic states is evaluated as well. Additionally, predictions of transition features, such as Einstein coefficients, Frank-Condon factors, and radiative lifetimes, are considered. It is concluded that the direct laser cooling of NaAs<sup>+</sup> is infeasible.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109270"},"PeriodicalIF":2.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696416","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}
引用次数: 0
Automated design of nonreciprocal thermal emitters via Bayesian optimization 通过贝叶斯优化自动设计非互惠热辐射器
IF 2.3 3区 物理与天体物理
Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-11-14 DOI: 10.1016/j.jqsrt.2024.109260
Bach Do , Sina Jafari Ghalekohneh , Taiwo Adebiyi , Bo Zhao , Ruda Zhang
{"title":"Automated design of nonreciprocal thermal emitters via Bayesian optimization","authors":"Bach Do ,&nbsp;Sina Jafari Ghalekohneh ,&nbsp;Taiwo Adebiyi ,&nbsp;Bo Zhao ,&nbsp;Ruda Zhang","doi":"10.1016/j.jqsrt.2024.109260","DOIUrl":"10.1016/j.jqsrt.2024.109260","url":null,"abstract":"<div><div>Nonreciprocal thermal emitters that break Kirchhoff’s law of thermal radiation promise exciting applications for thermal and energy applications. The design of the bandwidth and angular range of the nonreciprocal effect, which directly affects the performance of nonreciprocal emitters, typically relies on physical intuition. In this study, we present a general numerical approach to maximize the nonreciprocal effect. We choose doped magneto-optic materials and magnetic Weyl semimetal materials as model materials and focus on pattern-free multilayer structures. The optimization randomly starts from a less effective structure and incrementally improves the broadband nonreciprocity through the combination of Bayesian optimization and reparameterization. Optimization results show that the proposed approach can discover structures that can achieve broadband nonreciprocal emission at wavelengths from 5 to 40 μm using only a fewer layers, significantly outperforming current state-of-the-art designs based on intuition in terms of both performance and simplicity.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109260"},"PeriodicalIF":2.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696417","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}
引用次数: 0
Correlation of aerosol particles with clouds and radiation budget over the horn of Africa–Ethiopia using MODIS satellite data: Part 02 利用 MODIS 卫星数据分析非洲之角-埃塞俄比亚上空气溶胶颗粒与云层和辐射预算的相关性:第 02 部分
IF 2.3 3区 物理与天体物理
Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-11-14 DOI: 10.1016/j.jqsrt.2024.109261
Ambachew Abeje Alemu , Jaya Prakash Raju
{"title":"Correlation of aerosol particles with clouds and radiation budget over the horn of Africa–Ethiopia using MODIS satellite data: Part 02","authors":"Ambachew Abeje Alemu ,&nbsp;Jaya Prakash Raju","doi":"10.1016/j.jqsrt.2024.109261","DOIUrl":"10.1016/j.jqsrt.2024.109261","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The aerosol particles are positively associated with the cloud parameters, precipitation and radiation budgets. The correlations of the aerosols-clouds-precipitations interaction ACPI are uncertain, that show large spatiotemporal variability in their magnitude. For this study, the aerosol particles and clouds data were retrieved from the Moderate Resolution Imaging Spectroradiometer MODIS sensors. These comprized of aerosol optical depth AOD, Ångström exponential AET, atmospheric water vapor AWV, mean cloud fraction CFM, cloud top pressure CTP and cloud top temperature CTT. The precipitation PPT data is comprized of 3B43 monthly products sourced from Tropical Rainfall Measuring Mission TRMM and the outgoing long-wave radiation OLR flux is comprized of Clouds and the Earth‘s Radiant Energy System CERES satellite instruments.&lt;/div&gt;&lt;div&gt;The study covers sixteen sites in East Africa–Ethiopia with neighboring Eritrea, Djibouti, and South Sudan countries clustered into four regions for the periods 2001–2022 to provide detailed information on the aerosol particles spatiotemporal correlations on clouds and precipitation. The increase–decrease AET, AWV, CFM and PPT fluctuations are with AOD opposing OLR, CTP and CTT. The spatial correlations are oriented towards western part mostly in southwest of the study area regions. The clustered regions show minima radiative forcing in 2012 at the southwest cluster for all surface radiative forcing F&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mtext&gt;Surf&lt;/mtext&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; and at the southeast cluster for top of the atmosphere radiative forcing F&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mtext&gt;TOA&lt;/mtext&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, with their maxima at the northwest cluster in 2022 for F&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mtext&gt;Surf&lt;/mtext&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; and in 2010 for F&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mtext&gt;TOA&lt;/mtext&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; from both instruments. Accordingly, the minimum values are −23.83 Wm&lt;sup&gt;−2&lt;/sup&gt; and 8.37 Wm&lt;sup&gt;−2&lt;/sup&gt; for Terra and −22.95 Wm&lt;sup&gt;−2&lt;/sup&gt; and 7.68 Wm&lt;sup&gt;−2&lt;/sup&gt; for Aqua, and the maxima are −0.58 Wm&lt;sup&gt;−2&lt;/sup&gt; and 63.80 Wm&lt;sup&gt;−2&lt;/sup&gt; for Terra −1.37 Wm&lt;sup&gt;−2&lt;/sup&gt; and 58.83 Wm&lt;sup&gt;−2&lt;/sup&gt; for Aqua, respectively. Here, the values for all of the parameters we observed in the Terra satellite are mostly greater than those of the Aqua satellite. The values for the parameters were higher in the southern clusters, specifically in the southwest clusters, than in the northern clusters.&lt;/div&gt;&lt;div&gt;The mean cloud fraction CFM was less dominant, while AET was the most dominant variable with 0.02733&lt;span&gt;&lt;math&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt; slop value &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mn&gt;15&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;17547&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; in the regression analysis. The study area regions showed the best performance R values, with 0.93941 &lt;span&gt;&lt;math&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt; R ","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"331 ","pages":"Article 109261"},"PeriodicalIF":2.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696419","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}
引用次数: 0
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