Journal of Quantitative Spectroscopy & Radiative Transfer最新文献

{"title":"The Landé g-factors for the 1s22s22p1/2 and 1s22s22p3/2 states of middle-Z B-like ions: Importance from negative energy states","authors":"Ji-Min Wang ,&nbsp;Yong-Zhi Zhang ,&nbsp;Yong-Bo Tang","doi":"10.1016/j.jqsrt.2025.109413","DOIUrl":"10.1016/j.jqsrt.2025.109413","url":null,"abstract":"<div><div>In this work, we calculate the Landé g-factors for the <span><math><mrow><mn>1</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup><mn>2</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span> <span><math><mrow><mn>2</mn><msub><mrow><mi>p</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></math></span> and <span><math><mrow><mn>1</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup><mn>2</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span> <span><math><mrow><mn>2</mn><msub><mrow><mi>p</mi></mrow><mrow><mn>3</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></math></span> states in B-like systems with nuclear charges <span><math><mi>Z</mi></math></span> ranging from 10 to 20. Our method starts with the Dirac–Coulomb–Breit Hamiltonian, incorporating electron correlation effects from both negative-energy and positive-energy states using third-order many-body perturbation theory, and including leading-order quantum electrodynamics (QED) corrections through an approximate method. A key aspect of this research is to elucidate the role played by negative-energy states in determining Landé g-factors for B-like ions. Our findings reveal that negative-energy states are crucial for accurately evaluating the Landé g-factors for these states. The contributions from negative-energy states and positive-energy states are of similar magnitude but with opposite signs, resulting in a significant cancellation. The accuracy of our calculations is verified by comparing our results with available experimental results, showing good agreement. This work may serve as a valuable reference for future precise calculations of Landé g-factors in heavy atomic systems.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"338 ","pages":"Article 109413"},"PeriodicalIF":2.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620113","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":"Quantifying shortwave radiative forcing and heating rates of UTLS aerosols in the Asian summer monsoon anticyclone region","authors":"V.N. Santhosh,&nbsp;B.L. Madhavan,&nbsp;M. Venkat Ratnam","doi":"10.1016/j.jqsrt.2025.109430","DOIUrl":"10.1016/j.jqsrt.2025.109430","url":null,"abstract":"<div><div>This study quantifies the shortwave (SW) direct radiative forcing and heating rates associated with the monsoonal aerosol enhancements in the upper troposphere and lower stratosphere (UTLS) over a broad spatial domain (25°N to 37.5°N and 40°E to 95°E) within the Asian summer monsoon anticyclone (ASMA) region. Using satellites and reanalysis data, we examine three dominant aerosol scenarios—sulfate, nitrate, and anthropogenic aerosols—and demonstrate that these enhancements induce a cooling at the top of the atmosphere (TOA), with radiative forcing estimates ranging from −0.13 to −0.19 Wm^-2. Our analysis reveals increased upwelling SW fluxes at the TOA during the monsoon, with forcings reaching −0.2 Wm^-2 relative to winter conditions. While both scattering aerosols (sulfates and nitrates) and absorbing aerosols (anthropogenic) contribute to TOA cooling, the magnitude of cooling from anthropogenic aerosols is comparatively smaller. Within the UTLS column (12–20 km), heating rates peak at 0.04 K day^-1 for anthropogenic aerosols, while those associated with sulfate and nitrate aerosols remain significantly lower. Additionally, the study identifies key atmospheric changes during the monsoon, including elevated water vapor concentrations, reduced temperatures, and deceased ozone levels, both spatially and vertically, across the study domain. These findings underscore the critical role of Asian tropopause aerosols in shaping the regional radiation budget, emphasizing the need for their inclusion in future climate model assessments.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"339 ","pages":"Article 109430"},"PeriodicalIF":2.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683785","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":"HFC-23 from updated Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS) retrievals","authors":"R. Dodangodage ,&nbsp;P.F. Bernath ,&nbsp;C. Boone ,&nbsp;M. Lecours ,&nbsp;M. Schmidt","doi":"10.1016/j.jqsrt.2025.109416","DOIUrl":"10.1016/j.jqsrt.2025.109416","url":null,"abstract":"<div><div>HFC-23 (CHF<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>) retrievals from the Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS) have been improved. The volume mixing ratio (VMR) values in the recent update (v6) have increased compared to the previous ACE version 5.2 retrievals, and the relative uncertainties have decreased. The HFC-23 VMR time series has been calculated and compared with Advanced Global Atmospheric Gases Experiment (AGAGE) ground-based measurements, and the agreement has been improved in this new version. ACE data show that HFC-23 has increased at a rate of 1.03 ppt/year in recent years spanning 2012–2024.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"338 ","pages":"Article 109416"},"PeriodicalIF":2.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620116","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":"A fully ro-vibrationally resolved corona model for the molecular hydrogen Fulcher-α system","authors":"R.C. Bergmayr ,&nbsp;L.H. Scarlett ,&nbsp;D. Wünderlich ,&nbsp;D.V. Fursa ,&nbsp;M.C. Zammit ,&nbsp;I. Bray ,&nbsp;U. Fantz","doi":"10.1016/j.jqsrt.2025.109414","DOIUrl":"10.1016/j.jqsrt.2025.109414","url":null,"abstract":"<div><div>A ro-vibrationally resolved corona model for the molecular hydrogen Fulcher-<span><math><mi>α</mi></math></span> transition based on the Yacora solver is introduced. The model couples 1365 ro-vibrational levels of the <span><math><mrow><msup><mrow><mi>X</mi></mrow><mrow><mn>1</mn></mrow></msup><msubsup><mrow><mi>Σ</mi></mrow><mrow><mi>g</mi></mrow><mrow><mo>+</mo></mrow></msubsup></mrow></math></span>, <span><math><mrow><msup><mrow><mi>d</mi></mrow><mrow><mn>3</mn></mrow></msup><msub><mrow><mi>Π</mi></mrow><mrow><mi>u</mi></mrow></msub></mrow></math></span> and <span><math><mrow><msup><mrow><mi>a</mi></mrow><mrow><mn>3</mn></mrow></msup><msubsup><mrow><mi>Σ</mi></mrow><mrow><mi>g</mi></mrow><mrow><mo>+</mo></mrow></msubsup></mrow></math></span> states via electron impact excitation from the ground state into the <span><math><mrow><msup><mrow><mi>d</mi></mrow><mrow><mn>3</mn></mrow></msup><msub><mrow><mi>Π</mi></mrow><mrow><mi>u</mi></mrow></msub></mrow></math></span> state and subsequent spontaneous emission into the <span><math><mrow><msup><mrow><mi>a</mi></mrow><mrow><mn>3</mn></mrow></msup><msubsup><mrow><mi>Σ</mi></mrow><mrow><mi>g</mi></mrow><mrow><mo>+</mo></mrow></msubsup></mrow></math></span> state. For the process of electron impact excitation a set of 45260 fully ro-vibrationally resolved cross sections calculated with the molecular convergent close-coupling (MCCC) method in the adiabatic-nuclei formulation is applied. The MCCC cross sections are compared with results of a scaling method used in other works, demonstrating the need for dedicated ro-vibrationally resolved cross sections. By post-processing the model output, entire Fulcher spectra can be simulated. These spectra are benchmarked with measurements from an inductively coupled plasma discharge at a pressure between 1.1–10<span><math><mspace></mspace></math></span>Pa and a RF power of 700<span><math><mspace></mspace></math></span>W. The model results agree very well with the experiment both in relative shape and in absolute value. A non-ro-vibrationally resolved, purely electronically resolved collisional radiative model for molecular hydrogen (including further states and reaction channels) is applied to investigate the validity of the corona approximation for the benchmark plasmas and the relevance of possible process extensions of the corona model. Furthermore, the influence of collisional quenching, autoionization and predissociation is discussed.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"338 ","pages":"Article 109414"},"PeriodicalIF":2.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620114","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":"MARVEL analysis of high-resolution spectra of ozone (16O3)","authors":"Apoorva Upadhyay ,&nbsp;Tibor Furtenbacher ,&nbsp;Armando N. Perri ,&nbsp;Charles A. Bowesman ,&nbsp;Eamon K. Conway ,&nbsp;Katy L. Chubb ,&nbsp;Alec Owens ,&nbsp;Caitlin P. Dobney ,&nbsp;Ella Bowen ,&nbsp;Daniel Broner ,&nbsp;Victor Ciobanu ,&nbsp;Katherina Gelborova ,&nbsp;Sam Livsey ,&nbsp;Damilola Magbagbeola ,&nbsp;Madhushree Manjunatha ,&nbsp;Tom Mitchell ,&nbsp;David Morohunfola ,&nbsp;Emaan Wijayakoon ,&nbsp;Sophie Winter ,&nbsp;Jonathan Tennyson","doi":"10.1016/j.jqsrt.2025.109399","DOIUrl":"10.1016/j.jqsrt.2025.109399","url":null,"abstract":"<div><div>Accurate rotation-vibration (ro-vibrational) energy levels of the main isotopologue of ozone (¹⁶O₃) in its ground electronic <span><math><mrow><mover><mrow><mi>X</mi></mrow><mrow><mo>̃</mo></mrow></mover><msup><mrow><mspace></mspace></mrow><mrow><mn>1</mn></mrow></msup><msub><mrow><mi>A</mi></mrow><mrow><mn>1</mn></mrow></msub></mrow></math></span> state are determined by performing MARVEL (Measured Active Rotation Vibration Energy Levels) analysis on measured line positions from 29 sources of data published in scientific literature. A total of 50276 ro-vibrational transitions are considered yielding 13664 MARVEL energy levels of ¹⁶O₃ with their associated uncertainties. The maximum values of the energy and rotational angular momentum quantum number in the MARVEL dataset are 8167.33 cm⁻¹ and <span><math><mrow><mi>J</mi><mo>=</mo><mn>67</mn></mrow></math></span> respectively. Variational nuclear motion calculations of ¹⁶O₃ energy levels are performed and subsequently used to assess and validate the MARVEL results. Comparisons with alternative data compilations based on effective Hamiltonians are also shown.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"338 ","pages":"Article 109399"},"PeriodicalIF":2.3,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620115","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":"A modified recursive transfer matrix algorithm for radiation and scattering computation of a multilayered sphere","authors":"Jianing Zhang","doi":"10.1016/j.jqsrt.2025.109401","DOIUrl":"10.1016/j.jqsrt.2025.109401","url":null,"abstract":"<div><div>We discuss the electromagnetic scattering and radiation problems of multilayered spheres, reviewing the history of the Lorentz–Mie theory and the numerical stability issues encountered in handling multilayered spheres. By combining recursive methods with the transfer matrix method, we propose a modified transfer matrix algorithm designed for the stable and efficient calculation of electromagnetic scattering coefficients of multilayered spheres. The new algorithm simplifies the recursive formulas by introducing Debye potentials and logarithmic derivatives, effectively avoiding numerical overflow issues associated with Bessel functions under large complex variables. Moreover, by adopting a hybrid recursive strategy, this algorithm can resolve the singularity problem associated with logarithmic derivatives in previous algorithms. Numerical test results demonstrate that this algorithm offers superior stability and applicability when dealing with complex cases such as thin shells and strongly absorbing media.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"338 ","pages":"Article 109401"},"PeriodicalIF":2.3,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593440","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":"Accurate potential energy surface, dipole moment surface, and IR line lists for OCS isotopologues up to 2000 K","authors":"Xinchuan Huang ,&nbsp;Iouli E. Gordon ,&nbsp;Thibault Bertin ,&nbsp;David W. Schwenke ,&nbsp;Timothy J. Lee","doi":"10.1016/j.jqsrt.2025.109425","DOIUrl":"10.1016/j.jqsrt.2025.109425","url":null,"abstract":"<div><div>We report high-quality IR line lists of carbonyl sulfide (OCS) computed using an <em>ab initio</em> potential energy surface (PES) refined with selected energy levels from HITRAN2020 and experimental energies for highly excited vibrational states, and CCSD(T)/aug-cc-pV(T/Q/5+d)Z dipole moment surfaces (DMS). With PES accuracy σ_rms &lt; 0.01 cm^-1 for ¹⁶O¹²C³²S levels and DMS fitting σ_rms = 1.3×10^–7 au for potential energy &lt; 15,000 cm^-1, room-temperature IR line lists are generated for 12 OCS isotopologues in the 0–15,000 cm^-1 range with S_296K &gt; 10^–31 cm^-1/molecule.cm^-2, then combined into a composite line list of 9 million transitions, denoted Ames-296K. For high-temperature applications, an Ames-2000K OCS line list is constructed in the same range, including 7 OCS isotopologues, with J ≤ 240 and <em>E</em>' ≤ 23,000 cm^-1 for ¹⁶O¹²C^32/34S. The Ames line lists are compared to HITRAN, CDMS, JPL(2010) near-IR line list, ExoMol line list for ¹⁶O¹²C³²S, and high-resolution experimental IR studies. Data issues and discrepancies are identified and discussed. The accuracy of energy levels and line positions in the Ames line lists have been further enhanced using reliable experimental-based effective Hamiltonian (EH) models from HITRAN, or more consistent 0th-2nd order adjustments derived from the band-by-band comparisons between E_Ames and E_MARVEL, E_CDMS, and experimental data and models. We demonstrate the reliability and consistency of theoretical calculations may be utilized to determine more consistent empirical line positions, compared to direct MARVELization. The Ames-296K line list is evaluated against Pacific Northwest National Laboratory experimental cross sections, showing widespread improvements over HITRAN and ExoMol line lists in the range of 600–6500 cm^-1. The Ames line lists with empirically corrected line positions will provide accurate, reliable, and more complete IR predictions to facilitate OCS spectra analysis and modeling in atmospheric and exoplanetary studies. The PES, DMS, and line list files are available online to public.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"339 ","pages":"Article 109425"},"PeriodicalIF":2.3,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644658","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":"Extended high resolution study of  28SiH4 in the region of the octad stretching–bending bands","authors":"O.N. Ulenikov ,&nbsp;O.V. Gromova ,&nbsp;E.S. Bekhtereva ,&nbsp;N.I. Nikolaeva ,&nbsp;C. Sydow ,&nbsp;S. Bauerecker","doi":"10.1016/j.jqsrt.2025.109402","DOIUrl":"10.1016/j.jqsrt.2025.109402","url":null,"abstract":"<div><div>The infrared spectra of <!--> ²⁸SiH<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span> were measured at varied experimental conditions with a Bruker Fourier transform infrared spectrometer IFS125HR and analyzed in the 2800–3400 cm⁻¹ region where eight sub-bands of the four stretching–bending bands of the octad are located. The 5670 transitions (<span><math><mrow><msup><mrow><mi>J</mi></mrow><mrow><mtext>max</mtext></mrow></msup><mo>=</mo><mn>27</mn></mrow></math></span>) belonging to these sub-bands were assigned (which is 5.5 times higher in comparison with the amount of corresponding data known from the literature) in the recorded experimental spectra and theoretically reproduced by a set of 130 parameters (band centers, rotational, centrifugal distortion, tetrahedral splitting and resonance interaction parameters) obtained from the weighted fit with the <span><math><msub><mrow><mi>d</mi></mrow><mrow><mtext>rms</mtext></mrow></msub></math></span> deviation of <span><math><mrow><mn>4</mn><mo>.</mo><mn>7</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup></mrow></math></span> cm⁻¹. A list of assigned experimental transitions is presented as the Supplementary data to this paper.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"338 ","pages":"Article 109402"},"PeriodicalIF":2.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593439","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":"Monte-Carlo-based simulations of radiative transfer in photovoltaic solar farms: Towards fast and accurate parameterizations in weather and climate models","authors":"Chongxing Fan ,&nbsp;Xianglei Huang","doi":"10.1016/j.jqsrt.2025.109417","DOIUrl":"10.1016/j.jqsrt.2025.109417","url":null,"abstract":"<div><div>Photovoltaic (PV) solar farms, composed of arrays of photovoltaic panels, play a vital role in our effort to reduce the reliance on fossil fuels and mitigate global warming. Meanwhile, these panels alter surface radiative properties and can affect the local surface energy budget. To assess the influence of PV solar farms on the climate, previous modeling studies simply assumed flat solar panels lying on the ground and modified surface albedo to mimic the radiative effect of large-scale solar farm deployments. Here, we developed a Monte-Carlo-based radiative transfer model that can more accurately capture the role of the complex geometry of a real-world PV solar farm in 3-D radiative transfer. Specifically, solar panels are separated from the ground, tilted and elevated, with their own surface reflectance and emissivity. In this way, the scheme inherently accounts for the radiative transfer between panel and ground and between panel arrays. The model can be tailored to specific PV solar farm configurations through six adjustable input parameters, including panel tilt angle and spacing. A sensitivity analysis of both shortwave and longwave radiative processes within the farm reveals that front panel albedo (emissivity), ground albedo (emissivity), and panel area fraction determine the overall reflectivity (emissivity) of the entire solar farm site. Based on such Monte-Carlo calculations, a set of lookup tables was then constructed for fast parameterizations in the numerical weather models or climate models with desired computational efficiency.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"338 ","pages":"Article 109417"},"PeriodicalIF":2.3,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578748","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":"Accelerating radiative transfer calculations in the thermal infrared through principal component analysis of inherent optical properties","authors":"Vijay Natraj ,&nbsp;Robert J.D. Spurr","doi":"10.1016/j.jqsrt.2025.109415","DOIUrl":"10.1016/j.jqsrt.2025.109415","url":null,"abstract":"<div><div>Principal component analysis (PCA) is a linear mathematical transformation that reduces data dimensionality and enables easy identification of data variability; PCA converts a correlated mean-subtracted data set into a series of principal components (PCs). PCA can be performed on inherent optical properties to enhance the computational efficiency of radiative transfer calculations. Prior work has demonstrated the efficacy of this technique for the computation of radiances and Jacobians in the solar scattering regime, and for estimating broadband fluxes. Here, we extend the methodology to the thermal emission regime. We perform simulations for a nominal (model-based) aerosol scattering scenario, and for a scenario with enhanced aerosol scattering that is representative of strong pollution. The PCA-based approach provides top-of-the-atmosphere radiance results that are typically within 0.1% of numerically exact computations, while enabling a three-orders-of-magnitude speedup. We also investigate the accuracy levels achieved using variable numbers of PCs for different gas absorption optical depth regimes. Results show that more PCs are required for optical depths close to unity, while low and high optical depth scenarios can be simulated accurately with only one PC.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"339 ","pages":"Article 109415"},"PeriodicalIF":2.3,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683784","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}