Advances in Space Research最新文献

{"title":"Drivers of wildfire spatial expansion: Modeling insights from semi-arid oak forests of W Iran","authors":"Akram Sadeghi ,&nbsp;Mozhgan Ahmadi Nadoushan ,&nbsp;Naser Ahmadi Sani","doi":"10.1016/j.asr.2025.03.002","DOIUrl":"10.1016/j.asr.2025.03.002","url":null,"abstract":"<div><div>Wildfires are becoming increasingly recurrent in Iran, threatening vulnerable ecosystems, particularly the non-fire-adapted semi-arid oak forests in the western regions. This study investigates the environmental drivers influencing wildfire size in these forests, focusing on the years 2018–2020. To analyze the environmental drivers, a circular buffer of 314 ha was applied around each wildfire location, enabling the collection of predictive variables through remote sensing and in-situ measurements across three categories: topography, climate, and vegetation. Employing a non-linear Generalized Additive Model (R² = 0.822, explained deviance = 75.9 %), Land Surface Temperature (LST) emerged as the most significant factor in determining wildfire size, exhibiting a robust correlation with larger and faster-spreading fires. Furthermore, steep slopes and high-speed winds were associated with larger wildfires, enabling rapid fire spread and upslope progression. Wildfires were largest in areas with spatially consistent vegetation cover and peaked in April and May due to warmer temperatures and lower humidity. These findings underscore the need for the development of more proactive, adaptive, and effective strategies, ultimately reducing the toll of the destructive impacts on the integrity of these forests.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 10","pages":"Pages 7184-7194"},"PeriodicalIF":2.8,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"BDS-3/GPS uncombined real-time PPP with PPP-B2b precise products: Modeling and its long-term performance evaluation","authors":"Wujiao Dai ,&nbsp;Ning Liu ,&nbsp;Zhehao Zhang ,&nbsp;Chengpan Tang ,&nbsp;Zhixue Zhang ,&nbsp;Yufei Yang ,&nbsp;Lin Pan","doi":"10.1016/j.asr.2025.03.005","DOIUrl":"10.1016/j.asr.2025.03.005","url":null,"abstract":"<div><div>Through PPP-B2b real-time precise products, BDS-3 can provide the real-time precise point positioning (PPP) service without relying on the Internet for users in China and its surrounding regions. In this study, the BDS-3/GPS uncombined real-time PPP model with PPP-B2b precise products is constructed. In the constructed model, a receiver clock offset parameter is introduced for each satellite system to account for the frequent changes of GPS satellite clock datums, and a compensation parameter is also introduced for each satellite to mitigate the effects of initial systematic bias of satellite clock offsets. In addition, the long-term positioning performance of BDS-3/GPS real-time PPP with PPP-B2b precise products is evaluated using the observations from six stations spanning 196 days. The results show that the average convergence time can be 7.5 and 10.2 min (with a standard deviation (STD) of 3.9 and 6.4 min) over the analysis period in static and kinematic modes, respectively, which is shortened by 41.3 % and 61.4 % compared with the traditional model that ignores the influence of frequently switched datums and initial systematic bias of satellite clock offsets. The average positioning accuracy can be 4.6, 0.9, and 2.5 cm (with a STD of 1.3, 0.7, and 1.7 cm), and 6.4, 3.3, and 9.5 cm (with a STD of 2.3, 1.5, and 3.1 cm) in east, north, and up directions in static and kinematic modes, respectively. These results indicate that the BDS-3/GPS real-time PPP with PPP-B2b precise products can provide stable and reliable real-time high-precision navigation and positioning service.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 10","pages":"Pages 7212-7225"},"PeriodicalIF":2.8,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An optimal strategy for estimating chlorophyll-a concentration in case II waters to support sustainable development goals","authors":"Shang Tian ,&nbsp;Xiaotong Zhu ,&nbsp;Han Zhang ,&nbsp;Hongwei Guo ,&nbsp;Zijie Zhang ,&nbsp;Jinhui Jeanne Huang","doi":"10.1016/j.asr.2025.03.003","DOIUrl":"10.1016/j.asr.2025.03.003","url":null,"abstract":"<div><div>Estimating chlorophyll-a (Chl-a) concentrations in Case-Ⅱ waters is essential for monitoring water quality and supporting Sustainable Development Goals (SDG). Satellite-based estimation of Chl-a concentration depends heavily on both atmospheric correction (AC) and retrieval modeling. However, the accuracy of current AC methods for retrieving remote sensing reflectance in Case-Ⅱ waters remains variable due to the complex interaction between atmospheric and water constituents. Furthermore, the bias introduced by uncertainties in AC methods fuels inaccuracies in Chl-a retrieval modeling. In this study, we propose an optimal strategy for retrieving Chl-a from Landsat-8 and Sentinel-2 data by comparing the performance of six AC processors (ACOLITE, SeaDAS, OC-SMART, iCOR, Polymer, and Sen2cor) and five bio-optical models (OC3, BDA_2, YA10, BDA_3, and NDCI). The Lake Simcoe in Canada was selected to validate the performance of this optimal strategy. The results demonstrated that OC-SMART exhibited superior performance compared to other AC processors for both Landsat and Sentinel-2 data (RMSE ≤ 0.0031 sr^-1, MAE ≤ 1.70, Bias ≤ 1.60), and the NDCI obtained the best performance among the five bio-optical models (MAE = 1.29, RMSE = 2.54 mg m⁻³, bias = 0.99 and score = 88). The quantitative scoring system showed that the effectiveness of “OC-SMART − NDCI” strategy for Chl-a retrieval, with the highest score of 88. The spatial and temporal distribution of Chl-a in Lake Simcoe indicates that the pollution in Lake Simcoe was primarily concentrated in the eastern region of the lake. Since the implementation of ecological protection policies and measures in 2007, the eutrophication level of Lake Simcoe in 2022 has significantly decreased compared to 1984. Overall, the combined retrieval strategy proposed in this study can offer an accurate and practical method for revealing water quality status in Case-II waters, and providing technical support for achieving SDG goals.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 10","pages":"Pages 7195-7211"},"PeriodicalIF":2.8,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of the antenna characteristics on sea surface parameters estimated from low- and high-resolution satellite altimetry","authors":"Christopher Buchhaupt ,&nbsp;Alejandro Egido ,&nbsp;Salvatore Dinardo ,&nbsp;Claire Maraldi ,&nbsp;Thomas Moreau ,&nbsp;Luciana Fenoglio","doi":"10.1016/j.asr.2025.02.056","DOIUrl":"10.1016/j.asr.2025.02.056","url":null,"abstract":"<div><div>In this study, we present an extension to existing numerical retrackers of synthetic-aperture radar (SAR) altimetry signals considering a non Gaussian antenna characteristic. To our knowledge at the time of writing, this manuscript presents the most consistent retrieval of geophysical parameters compared to Low Resolution Mode (LRM) retracking results. The novelty is an approximation of the theoretical antenna pattern with a sum of three Gaussian functions to mitigate the sea surface height estimation errors for Sentinel-3A and Sentinel-6A in SAR mode. Additionally, we explain offsets in the derived closed-form equation and describe the mean along-track water velocity <span><math><mrow><msub><mrow><mi>u</mi></mrow><mrow><mi>x</mi></mrow></msub></mrow></math></span> (later mean line of sight velocity) as function of eastward and northward wind This allows us to mitigate the effects of <span><math><mrow><msub><mrow><mi>u</mi></mrow><mrow><mi>x</mi></mrow></msub></mrow></math></span> in a SAR stack and a lookup table is generated to correct the sea surface height estimates in SAR mode. Further on, we discuss how this new approach performs with respect to different antenna pattern implementations by processing five months (cycles 72 to 76) of Sentinel-3A and six months (cycles 17 to 42) of Sentinel-6A level 1A data on a global scale. We observe that the new retracking method is, on average, more accurate with respect to LRM. To ensure that the results of the new retracker are not biased, we retrack using the new and the current state-of-the-art method on Sentinel-3A and Sentinel-6A data produced in a Monte Carlo simulation. We analyze the simulation results with respect to the accuracy of sea level anomalies as function of the significant wave height (SWH), considering as reference the LRM sea level anomalies. We show that the accuracy of the new antenna characterization is higher compared to a single Gaussian approximation.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 8","pages":"Pages 6140-6157"},"PeriodicalIF":2.8,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wavelet-based intelligent optimization for doppler velocity estimation in the presence of celestial spectral distortion","authors":"Zijun Zhang ,&nbsp;Jin Liu ,&nbsp;Xiaolin Ning ,&nbsp;Xin Ma","doi":"10.1016/j.asr.2025.02.062","DOIUrl":"10.1016/j.asr.2025.02.062","url":null,"abstract":"<div><div>The variations in instrument status, along with the absorption and reflectance of planetary bodies, can cause distortions in celestial spectra that affect the accuracy of Doppler velocity estimation. High-precision Doppler velocity estimation can enhance the accuracy of the celestial velocimetry navigation. To address this issue, we propose a wavelet-based intelligent optimization for Doppler velocity estimation (WIODVE), considering that wavelet coefficients encapsulate spectral distortion signals. During the training phase, the WIODVE utilizes a weighted factor set derived from the wavelet coefficients of celestial spectra to construct the position of horned lizards, using the Doppler velocity error as the fitness function. The horned lizard optimization algorithm (HLOA) is employed to optimize the weight factor set, allowing for the reconstruction of spectral distortions. In the testing phase, the optimized weight factor set and wavelet transform are used to dynamically reconstruct the distortion of the celestial spectra. Subsequently, the reconstructed distortions are employed to correct the observed celestial spectra, with Doppler velocity estimated by the Taylor method. Additionally, we derive the Cramér-Rao lower bound (CRLB) for Doppler velocity estimation in the presence of celestial spectral distortion. Experimental results demonstrate that the WIODVE outperforms both the template enhanced radial velocity reanalysis application (TERRA) and the Taylor methods, approaching the CRLB, and exhibits strong robustness to spectral distortions in the estimation of the Doppler velocity. Furthermore, the WIODVE significantly enhances the accuracy of the celestial velocimetry navigation.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 10","pages":"Pages 7524-7539"},"PeriodicalIF":2.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal stability design of cable-net structure for mesh reflector antennas","authors":"Zihan Sun,&nbsp;Yiduo Quan,&nbsp;Naigang Hu,&nbsp;Na Li,&nbsp;Yiqun Zhang","doi":"10.1016/j.asr.2025.02.063","DOIUrl":"10.1016/j.asr.2025.02.063","url":null,"abstract":"<div><div>Cable-net structures play a crucial role in the construction of mesh reflector antennas, where maintaining high reflector surface accuracy is essential for achieving optimal electromagnetic performance. However, the reflector surface accuracy tends to degrade under space periodic thermal loads. To ensure that the antenna still has high accuracy in space environments, this study proposes a design method, that is, two materials with opposite thermal response mechanisms are used to construct the cable-net structure. Unlike the conventional approach of using a single material, this dual-material strategy results in a reflector surface that is less sensitive to thermal loads. The effectiveness of proposed method is demonstrated through case studies and semi-physical simulations.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 10","pages":"Pages 7540-7550"},"PeriodicalIF":2.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Forecasting single-station ionospheric TEC over China using a combined DBO-LSTM model during geomagnetic storms","authors":"Jun Tang ,&nbsp;Lang Xu ,&nbsp;Chaoqian Xu ,&nbsp;Liang Zhang","doi":"10.1016/j.asr.2025.02.061","DOIUrl":"10.1016/j.asr.2025.02.061","url":null,"abstract":"<div><div>The ionospheric total electron content (TEC) in the ionosphere is a crucial parameter for studying ionospheric variations and space weather. Short-term prediction of the ionosphere is of significant importance for near-Earth space environment monitoring. This study proposes a hybrid model combining Dung Beetle Optimization (DBO) algorithm and Long Short-Term Memory (LSTM) neural network. By optimizing the number of neurons in the LSTM network, the dropout rate, the number of neurons in the fully connected layer, and the batch size, the prediction accuracy of the model can be improved to a certain extent. This paper utilizes TEC data from 24 GNSS observation stations of Crustal Movement Observation Network of China (CMONOC) and five parameters selected through Random Forest training, including f10.7, Lyman_alpha, SW Plasma Speed, Dst, and R Sun Spot indices to train the model. By forecasting ionospheric TEC during geomagnetic storms and comparing the model’s prediction results with those of LSTM and RNN models, it is found that the DBO-LSTM model outperforms the LSTM and RNN models on the test set. During severe geomagnetic storms, the RMSEs of the DBO-LSTM, LSTM, and RNN models at the low-latitude station GDZH are 5.34 TECU, 5.91 TECU, and 6.38 TECU, respectively. The proposed model demonstrates good predictive performance during geomagnetic storms.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 10","pages":"Pages 7684-7695"},"PeriodicalIF":2.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solar activity and ionospheric variation: A comprehensive study using hurst exponent and probability density functions analysis","authors":"Mahdi Momeni ,&nbsp;Yenca Migoya-Orué","doi":"10.1016/j.asr.2025.02.060","DOIUrl":"10.1016/j.asr.2025.02.060","url":null,"abstract":"<div><div>This study analyzes the ionospheric dynamics during the solar maximum of 2014 and the solar minimum of 2019, focusing on Vertical Total Electron Content (vTEC) and key solar and geomagnetic indices, including SYM-H, X-ray flux, and Extreme Ultraviolet (EUV) irradiance. By employing the Hurst exponent and Probability Density Function (PDF) analysis, we quantify the persistence and correlation properties of ionospheric fluctuations under varying solar conditions. The Hurst exponent reveals significant long-range correlations in vTEC, indicating a high level of persistence, particularly during solar minimum. In contrast, solar maximum conditions exhibit more unstable behavior across all indices, with lower Hurst values suggesting enhanced short-term irregularities. PDF analysis shows leptokurtic distributions, highlighting the prevalence of extreme events, especially during heightened solar activity. Our findings underscore the complex interplay between solar activity and ionospheric behavior, providing valuable insights for improving predictive models related to space weather impacts on communication and navigation systems.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 10","pages":"Pages 7668-7683"},"PeriodicalIF":2.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A carrier phase hybrid model for adjusting the procedures to process ionospheric radio sounding measurements with high temporal resolution","authors":"V.V. Demyanov ,&nbsp;E.I. Danilchuk ,&nbsp;Baocheng Zhang ,&nbsp;D. Venkata Ratnam ,&nbsp;Y.V. Yasyukevich","doi":"10.1016/j.asr.2025.03.001","DOIUrl":"10.1016/j.asr.2025.03.001","url":null,"abstract":"<div><div>We offer a hybrid model of phase of <em>trans</em>-ionospheric GNSS signals. The model allows the simulation of all components of <em>trans</em>-ionospheric signal phase variations due to effects of the background ionosphere, travelling ionospheric disturbances of different scales, Fresnel ionospheric irregularities, and measurement noise in a receiver. The proposed model combines actual TEC and analytical representation of GNSS signal frequency variations. The model was tested when pre-assessing the standard procedures for processing phase measurements and calculating ionospheric indices such as TEC, <em>ROTI</em>, <em>σϕ</em>, <em>d2fi</em> and <em>fd</em>. The application of the model demonstrates its efficiency and usability in selecting the optimal types and parameters of procedures to filter and de-trend phase measurements and to calculate the ionospheric scintillation indices based on high temporal resolution GNSS data. As a potential practical application, the proposed model is a promising tool for training artificial intelligence algorithms to provide effective automatic detection of specific classes of ionospheric disturbances or ionospheric responses to certain types of impacts.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 10","pages":"Pages 7711-7725"},"PeriodicalIF":2.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of tone errors in future satellite gravimetry missions","authors":"Nikolas Pfaffenzeller,&nbsp;Roland Pail,&nbsp;Thomas Gruber","doi":"10.1016/j.asr.2025.02.059","DOIUrl":"10.1016/j.asr.2025.02.059","url":null,"abstract":"&lt;div&gt;&lt;div&gt;One of the main limiting factors to observe variations of the very low degrees and orders of the spherical harmonic (SH) spectrum of the Earth’s gravity field with satellite gravimetry missions like GRACE and GRACE-FO are the so-called tone errors. They are deterministic errors occurring periodically at the orbital frequency of the spacecraft (one cycle-per-revolution, 1 CPR) and its multiples. Tone errors are generated by external perturbations acting on the satellite at the spacecraft environment and by spacecraft-internal processes. In this study, we investigate the impact of tone errors on the resulting gravity field model and their mitigation by numerical simulations for selected mission concepts. We start with a GRACE/GRACE-FO-like single polar pair mission concept and extend the simulations to a so-called Bender double pair constellation by adding an inclined (70°) satellite pair. Within our gravity-field simulation approach, we consider realistic instrument noise assumptions for the accelerometers and the inter-satellite ranging instrument, leading to instrument-only simulation scenarios. Tone error contributions are modeled at so-called orbital harmonics at 1, 2, and 3 CPR and incorporated into the instrumental noise time series. Three selected sets of low, moderate and large tone amplitudes and the occurrence of a single tone amplitude on either 1, 2, or 3 CPR are considered to analyze the effects on gravity field retrieval. Simulation results show, that for instrument-only scenarios, tone errors significantly affect single polar pair solutions over the complete SH spectrum by amplifying resonance orders, whereas double pair solutions are less affected. Since the tone amplitudes and occurrences are known, the applied stochastic modeling based on the instrumental behavior is extended by additional notch filters to mitigate the impact of tone errors. This approach has been selected to identify its performance and applicability for gravity field determination. Applying the adapted stochastic model, we can conclude that for both satellite constellations, the erroneous effect of tone errors in the higher SH spectrum can be mitigated at the cost of increased errors in the low degrees. The behavior, as seen in the instrument-only scenarios, cannot be confirmed in additional, more realistic simulations, including temporal gravity field contributions, called full-noise scenarios. Temporal gravity field signals are, in general, larger than the erroneous signal caused by tone errors. The under-sampling of high-frequency mass signals from atmosphere, ocean and ocean tides, causing temporal aliasing, dominates the gravity field solution errors for single and double pair constellations and is up to one order of magnitude larger than the tone errors impact considering low and moderate tone amplitudes. Only with large tone amplitudes the tone error effect exceeds temporal aliasing in the case of a single polar pair. In the presence of tempora","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 10","pages":"Pages 6961-6980"},"PeriodicalIF":2.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}